IQ's

IQ Test - Questions with Answers

A little intelligence test for you - no cheating. Some of these questions are from an MBA entrance test. There are 10 questions. Do not look at the answers found at the end of this document, that would be cheating. Write each of your answers down, it makes a difference. Good Luck!

1. Some months have 30 days, some months have 31 days. How many months have 28 days?
2. If a doctor gives you 3 pills and tells you to take one pill every half hour, how long would it be before all the pills had been taken?
3. I went to bed at eight 8 'clock in the evening and wound up my clock and set the alarm to sound at nine 9 'clock in the morning. How many hours sleep would I get before being awoken by the alarm?
4. Divide 30 by half and add ten. What do you get?
5. A farmer had 17 sheep. All but 9 died. How many live sheep were left?
6. If you had only one match and entered a COLD and DARK room, where there was an oil heater, an oil lamp and a candle, which would you light first?
7. A man builds a house with four sides of rectangular construction, each side having a southern exposure. A big bear comes along. What color is the bear?
8. Take 2 apples from 3 apples. What do you have?
9. How many animals of each species did Moses take with him in the Ark?
10. If you drove a bus with 43 people on board from Chicago and stopped at Pittsburgh to pick up 7 more people and drop off 5 passengers and at Cleveland to drop off 8 passengers and pick up 4 more and eventually arrive at Philadelphia 20 hours later, What's the name of the driver?

Good Luck!

Answers

1. All of them. Every month has at least 28 days.
2. 1 hour. If you take a pill at 1 o'clock, then another at 1.30 and the last at 2'clock, they will be taken in 1 hour.
3. 1 hour. It is a wind up alarm clock which cannot discriminate between a.m. and p.m.
4. 70. Dividing by half is the same as multiplying by 2.
5. 9 live sheep.
6. The match.
7. White.
8. 2 apples.
9. None. It was Noah, not Moses.
10. You are the driver.

Basic General Knowledge ? Multiple Choice Quiz

1. How many languages and dialects are spoken by people all over the world?
   1. 6,000
   2. 9,000
   3. 4,000
   4. 1,000
   
   
2. Approximately, how many people speak Chinese language?
   1. 1 billion
   2. 1 million
   3. 1 lakh
   4. 1 thousand
   
   
3. The language with the richest vocabulary is:
   1. Hindi
   2. French
   3. English
   4. German
   
   
4. English Language have more than ?? words:
   1. 4,50,000
   2. 45,000
   3. 4,500
   4. 450
   
   
5. The oldest Indian language is:
   1. Telugu
   2. Hindu
   3. Tamil
   4. Punjabi
   
   
6. Which book has been printed in the maximum number of languages and these scripts?
   1. The Bible
   2. Hiraka Sutra
   3. The Super Book
   4. None of these
   
   
7. The only religious book ever printed in a shorthand scripts is:
   1. The Ramayana
   2. The Mahabharata
   3. The bible
   4. Guru Granth Sahib
   
   
8. The oldest printed work in the world, which dates back to AD 868 is:
   1. The Bible
   2. The Hirake Sutra
   3. The Ramayana
   4. The Mahabharata
   
   
9. The largest book, the super book, is ?? and weight is ??
   1. 270 cm, 300 cm, 252 kg.
   2. 100 cm, 110 cm, 100 kg.
   3. 200 cm, 100 cm, 60 kg.
   4. None of these
   
   
10. Les Hommes de bonne volonté is the:
    1. Longest novel ever published
    2. Shortest novel every published
    3. The oldest novel
    4. None of these
    
    
11. The author of the play/book ?Ratnawali? is:
    1. Tulsidas
    2. Kalidas
    3. Harsha Vardhan
    4. Prem Chand
    
    
12. Which of the following in the book/play written by Maithili Sharan Gupt?
    1. Saket
    2. Satyartha Prakash
    3. Shakuntala
    4. Savitri
    
    
13. The book ?Satyartha Prakash? was written by:
    1. Swami Dayanand
    2. Swami Vivekanand
    3. Sarojini Naidu
    4. Kalidas
    
    
14. The play/book ?Shakuntala? was written by:
    1. Maithili Sharan gupt
    2. Swami Dayanand
    3. Kalidas
    4. Tulsidas
    
    
15. Which of the following is the author of ?Song of India, The?:
    1. Firdausi
    2. Sarojini Naidu
    3. Lala Lajpat Rai
    4. Sri Aurobindo Ghosh
    
    
16. The author of the book ?Time machine? is:
    1. Lewis Carroll
    2. Robert Louis Stevenson
    3. Charles Lamb
    4. H.G. Wells
    
    
17. Which of the following book was written by Tulsidas:
    1. Vinay Patrika
    2. Ramcharitmanas
    3. Both (a) and (b)
    4. Yashodhara
    
    
18. The book ?Vish Vriksha? was written by:
    1. Bankimchandra Chatterjee
    2. Annie Basant
    3. Tulsidas
    4. Kalidas
    
    
19. The book ?We Indians? was written by:
    1. H.G. Wells
    2. Khushwant Singh
    3. James Jeans
    4. Thomas Moore
    
    
20. Which of he following is he author of play/book ?Yashodhara?:
    1. Maithili Sharan Gupt
    2. Khushwant Singh
    3. Bankimchandra Chatterjee
    4. Sarojini Naidu
    
    
21. Dhyan Chand was:
    1. A great hockey player
    2. Captained he Indian hockey team which won a gold medal in 1936 Berlin Olympics
    3. Scored 101 goals at the Olympic games and 300 goals in the international matches.
    4. All the statements are correct
    
    
22. Who developed the small pox vaccination?
    1. Eduard Jenner
    2. Alexander Fleming
    3. Albert Einstein
    4. None of these
    
    
23. Euclid was:
    1. Greek mathematician
    2. Contributor to the use of deductive principles of logic as the basis of geometry
    3. Propounded the geometrical theosems
    4. All the statements are correct
    
    
24. Fa-hien was:
    1. The first Buddhist pilgrim of China to visit India during the reign of Chandragupta Vikramaditya
    2. The discover of Puerto Rico and Jamaica
    3. The first Buddhist pilgrim of India to visit China
    4. None of these
    
    
25. Firdausi was:
    1. A person poet
    2. Well known for his epic ?Sharnama?
    3. Both are correct
    4. None of these
    
    
26. Who is also known as the ?Lady with the Lamp??
    1. Florence Nightingale
    2. Sarojini Naidu
    3. Rani Laxmibai
    4. Bachendri Pal
    
    
27. Gabriel Daniel Fahrenheit was:
    1. A German Physicist
    2. Developed the mercury thermometer in 1714
    3. Devised temperature scale
    4. All are correct
    
    
28. Galileo was an Italian astronomer who:
    1. Developed the telescope
    2. Discovered 4 satellites of Jupiter
    3. Discovered that the movement of the pendulum produces a regular time measurement.
    4. All are correct
    
    
29. Who is known as the father of English poetry?
    1. Geoffrey Chaucer
    2. John Milton
    3. John Keats
    4. None of these
    
    
30. The American General who led the revolt against the British & declared American independence was:
    1. George Washington
    2. Bill Clinton
    3. George Bush
    4. None of these
    
    
31. Marco Polo
    1. Discovered Greenland
    2. Traveled three China, India and other parts of Asia
    3. Traveled round the cape of Good Hope
    4. Discovered Canada
    
    
32. Who landed on the mainland of South America for the First time?
    1. Discovered Greenland
    2. Landed on the mainland of south America
    3. Discovered the sea route from Europe to India.
    4. None of these
    
    
33. Who was first to sail sound the strait, reached the Philippines and named the Pacific Ocean?
    1. Ferdinand Magelion
    2. Jacques Carter
    3. William Janszoom
    4. Vasco da Gama
    
    
34. Who discovered Australia?
    1. Eric the Red
    2. Leif Ericsson
    3. William Janszoom
    4. None of these
    
    
35. Who located the magnetic pole?
    1. Sir James Clark
    2. Rear Admiral
    3. Sir John Ross
    4. All the above
    
    
36. Who was first to reach the South Pole?
    1. Rear Admiral
    2. Capt. Amundsen
    3. Capt. R. E. Scett
    4. Sir Edmund Hillary
    
    
37. Who was the first to cross the Antarctic?
    1. Sir Vivian Fuchs & sir Edmund Hillary
    2. Maj. Yuri Gagarin and Maj. Gherman Titor
    3. Capt. R. E. Scott
    4. All of these
    
    
38. Who were the first to journey into space?
    1. Maj. Yori Gagarin and maj. Gherman Titor from Russia
    2. Comm. Grissom and Col john Glenn from America
    3. Both are correct
    4. None of these
    
    
39. Who was the first man to ?Walk? in space?
    1. Col. Leonor from Russia
    2. Major White from America
    3. Both of these
    4. None of these
    
    
40. Who were the first to circle the moon?
    1. Frank boreman, Bill Anders and Jim Lovell
    2. Neil Armstrong and Edwin Aldrin
    3. Charles Conrad and Alan Bean
    4. None of these
    
    
41. ?Arena? is the special name for playground of:
    1. Cricket
    2. Lawn Tennis
    3. Wrestling
    4. Skating
    
    
42. The national sport of Canada is:
    1. Tennis and cricket
    2. Lacrosse
    3. Judo
    4. Rugby and Football
    
    
43. Badminton is the national sport at:
    1. Malaysia
    2. Scotland
    3. China
    4. Former soviet Union
    
    
44. Where is the Vallabhbhai Patel stadium located?
    1. Kolkata
    2. Mumbai
    3. Chennai
    4. Delhi
    
    
45. Where is the sports stadium, Green Park, located?
    1. Kanpur
    2. Jamshedpur
    3. Cuttack
    4. Patiala
    
    
46. For which of the following disciplines in Nobel Prize awarded?
    1. Physics and chemistry
    2. Physiology or Medicine
    3. Literature, Peace and Economics
    4. All the above
    
    
47. On which date is Nobel Prize awarded?
    1. December 10
    2. January 10
    3. April 10
    4. July 10
    
    
48. The Royal Swedish Academy of Sciences, awarded the Noble Prize in:
    1. Physics
    2. Economics
    3. Chemistry
    4. (a) and (c)

Answers

1. b	2. a	3. c	4. a	5. c
6. a	7. c	8. b	9. a	10. a
11. c	12. a	13. a	14. c	15. b
16. d	17. c	18. a	19. b	20. a
21. d	22. a	23. d	24. a	25. c
26. a	27. d	28. d	29. a	30. a
31. b	32. b	33. a	34. c	35. d
36. b	37. a	38. c	39. c	40. a
41. c	42. b	43. a	44. b	45. a
46. d	47. a	48. d	49. b	50. a

Exercise Your Brain:

Can you find the C? (Good exercise for the eyes)

OOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOO
OOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOO
OOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOO
OOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOO
OOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOO
OOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOO
OOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOCOOOOOOOOOOOOOOO
OOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOO
OOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOO
OOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOO
OOOOOOOOOOOOOOOOOOOOOOOOOO OOOOOOOOOOOOOOOOOOOOOOOOO

Once you've found the C, Find the 6!

9999999999999999999999999999999999
9999999999999999999999999999999999
9999999999999999999999999999999999
9999999999999999999999999999999999
9999999999999999999999999999999999
9999999999999999999999999999999999
9999699999999999999999999999999999
9999999999999999999999999999999999
9999999999999999999999999999999999
9999999999999999999999999999999999
9999999999999999999999999999999999
9999999999999999999999999999999999

Once you've found the 6, Find the N! (it's hard)

MMMMMMMMMMMMM
MMMMMMMMMMMMM
MMMMMMMMMMMMM
MMMMMMMNMMMMM
MMMMMMMMMMMMM
MMMMMMMMMMMMM
MMMMMMMMMMMMM
MMMMMMMMMMMMM
MMMMMMMMMMMMM
MMMMMMMMMMMMM

Questions

1. Which instrument is used to measure pressure?
   1. Saccharimeter
   2. Ammeter
   3. Manometer
   4. Lactometer
   
   
2. What does Angstrom measure?
   1. Quantity of liquid
   2. Length of light waves
   3. Length of cables
   4. Speed of ships
   
   
3. Light year is related to
   1. Energy
   2. Speed
   3. Distance
   4. Intensity
   
   
4. Match the following columns

   Column 1	Column 2
   A. Relative	1. Pyrometer humidity
   B. Anemometer	2. High temperature
   C. Navigation	3. Hygrometer
   D. Direction of wind	4. Chronometer
   1 2 3 4 a. B D A C b. D B A C c. A D B C d. C A D B

   
   
5. Which of the following instruments is used to measure pressure of gases?
   1. Barometer
   2. Manometer
   3. Ammeter
   4. None of these
   
   
6. Joule is the unit of
   1. Temperature pressure
   2. Energy
   3. Heat
   
   
7. How many Dynes are there in one gram weight?
   1. 900
   2. 375
   3. 981
   4. 250
   
   
8. How many Ergs are these in 1 Joule?
   1. 102
   2. 104
   3. 106
   4. 107
   
   
9. The unit of current is
   1. Ohm
   2. Watt
   3. Ampere
   4. None of these
   
   
10. The unit of energy in MKS system is
    1. Volt
    2. Erg
    3. Ohm
    4. Joule
    
    
11. The intensity of an earthquake is measured with a
    1. Barometer
    2. Hydrometer
    3. Polygraph
    4. Seismograph
    
    
12. Centigrade & Fahrenheit scales give same reading at
    1. - 400o
    2. - 32o
    3. - 273o
    4. - 100o
    
    
13. Match the following columns

    Column 1	Column 2
    A. Anemometer	1. To measure underwater depth using sound
    B. Aneroid barometer	2. To measure very small distances
    C. Micrometer	3. Find out wind speed
    D. Fathometer	4. Find out direction of wind
    	5. Measure atmospheric pressure
    1 2 3 4 a. A4 B5 C3 D1 b. A3 B5 C2 D1 c. A5 B1 C3 D4 d. A3 B1 C5 D2

    
    
14. Who among the following described protoplasm as the physical basis of life?
    1. T. H. Huxley
    2. Leeuwenhoek
    3. Rudolf Virchow
    4. J. C. Bose
    
    
15. The scientist who first discovered that the earth revolves round the sun was
    1. Newton
    2. Dalton
    3. Copernicus
    4. Einstein
    
    
16. Alexander Fleming discovered
    1. Penicillin
    2. X-ray
    3. Streptomycin
    4. Telephone
    
    
17. Who among following invented the steam engine?
    1. Marconi
    2. James Watt
    3. Thomas Savery
    4. Wright Brothers
    
    
18. Who invented typewriter?
    1. Shockley
    2. Pascal
    3. Sholes
    4. Waterman
    
    
19. Match the following columns:

    Column 1	Column 2
    A. Proton	1. Chadwick
    B. Neutron	2. Millikan
    C. Charged Electron	3. Goldstein
    D. Shelled nature of atom	4. Rutherford
    	5. Madam Curie
    a. A1 B2 C3 D5 b. A2 B1 C4 D3 c. A2 B3 C1 D4 d. A4 B2 C3 D1

    
    
20. Who discovered circulation of blood in human body?
    1. Edward Jenner
    2. Joseph Lister
    3. William Harvey
    4. Jonon Esals
    
    
21. The first attempt in printing was made in England by
    1. James Arkwright
    2. James Watt
    3. William Caxton
    4. Isaac Newton
    
    
22. Who was the surgeon who pioneered antiseptic surgery in 1865?
    1. Edward Jenner
    2. Joseph Lister
    3. Henry William
    4. John Sleeman
    
    
23. The credit of inventing the television goes to
    1. Faraday
    2. Baird
    3. Edison
    4. Marconi
    
    
24. The credit of developing the polio vaccine goes to
    1. Jonas Salk
    2. Alb E. Sabin
    3. Selman Waksman
    4. None of these
    
    
25. Mark the wrong combination
    1. James Watt: Steam Engine
    2. A.G. Bell: Telephone
    3. J. L. Baird: Television
    4. J. Perkins: Penicillin
    
    
26. Choose the correct combination
    1. Typewriter: Remington
    2. Dynamite: Dunlop
    3. Evolution: Darwin
    4. Aeroplane: Harway
    
    
27. Who invented the ball point pen?
    1. Waterman
    2. Oscar
    3. Wilson
    4. Lazlo Biro
    
    
28. Blaze Pascal is associated with
    1. Calculating machine
    2. Computer
    3. Cinema
    4. None of these
    
    
29. Wright Brothers are regarded inventors of the
    1. Balloon
    2. Bicycle
    3. Aeroplane
    4. None of these
    
    
30. Which of the following pairs is incorrect?
    1. Roentgen: X-ray
    2. Newton: Law of gravitation
    3. Faraday: Diffusion of gases
    4. Pasteur: Bacteriology
    
    
31. Philology is the
    1. Study of bones
    2. Study of muscles
    3. Study of architecture
    4. Study of languages
    
    
32. Anatomy is the branch of science which deals with
    1. Structure of animals and plants
    2. Functioning of body organs
    3. Animal behavior
    4. Cells and tissues
    
    
33. Study of earthquakes is known as
    1. Ecology
    2. Seismology
    3. Numismatics
    4. None of these
    
    
34. Ecology deals with
    1. Birds
    2. Cell formation
    3. Relation between Organisms and their environment
    4. Tissues
    
    
35. Meteorology is the science of
    1. Weather
    2. Meteors
    3. Metals
    4. Earthquakes
    
    
36. Oncology is the study of
    1. Birds
    2. Cancer
    3. Mammals
    4. Soil
    
    
37. Study of life in outer space is known as
    1. Endobiology
    2. Exobiology
    3. Enterobiology
    4. Neobiology
    
    
38. Numismatics is the study of
    1. Coins
    2. Numbers
    3. Stamps
    4. Space
    
    
39. Eugenics is the study of
    1. Altering humans beings by changing their genetic components
    2. People of European origin
    3. Different races of mankind
    4. Genetics of plants
    
    
40. Ornithology is the
    1. Study of bones
    2. Study of birds
    3. Study of smells
    4. None of these
    
    
41. Who invented the Doctor’s thermometer?
    1. Fahrenheit
    2. Edison
    3. Galileo
    4. None of these
    
    
42. The velocity of light was first measured by
    1. Einstein
    2. Newton
    3. Romer
    4. Galileo
    
    
43. Who proposed the chemical evolution of life?
    1. Darwin
    2. Lammarck
    3. Oparin
    4. Haechel
    
    
44. The telephone was invented by
    1. John Logie Baird
    2. Alexander Graham Bell
    3. Thomas Elva Edison
    4. James Watt
    
    
45. Who among the following evolved the concept of relationship between mass and energy?
    1. Einstein
    2. Planck
    3. Dalton
    4. Rutherford
    
    
46. Match the following columns:

    Column 1	Column 2
    A. Radioactivity	1. Planck
    B. Periodic Table	2. Thomson
    C. Quantum Theory	3. Rutherford
    D. X-Rays	4. Mendeleev
    	5. Roentgen
    	6. Becquerel
    a. A1 B3 C5 D2 b. A6 B5 C3 D5 c. A3 B2 C1 D5 d. A6 B4 C1 D5

    
    
47. Match the following columns:

    Column 1	Column 2
    A. Marconi	1. Radio
    B. Darwin	2. Natural selection theory
    C. Laennec	3. Orthogenesis theory
    D. Baird	4. Stethoscope
    	5. Television
    a. A1 B3 C4 D5 b. A5 B4 C3 D2 c. A1 B2 C4 D5 d. A3 B5 C2 D4

    
    
48. Robert Koch worked on
    1. Tuberculosis
    2. Cholera
    3. Malaria
    4. Diabetes
    
    
49. Who discovered Uranus?
    1. Herschel
    2. Ganleo
    3. Copernicus
    4. None of these

Answers

1. c	2. d	3. c	4. a	5. b
6. c	7. c	8. d	9. c	10. d
11. d	12. a	13. b	14. a	15. c
16. a	17. b	18. c	19. c	20. c
21. c	22. b	23. b	24. a	25. d
26. c	27. d	28. a	29. c	30. c
31. d	32. a	33. b	34. c	35. a
36. b	37. b	38. a	39. a	40. b
41. a	42. c	43. c	44. b	45. a
46. d	47. c	48. a	49. a	50. b

Everyday Science Questions Answered ?

1. Question: A man with a load jumps from a high building. What will be the load experienced by him?
Answer: Zero, because while falling, both the man and the load are falling at the same acceleration i.e. acceleration due to gravity.

2. Question: A piece of chalk when immersed in water emits bubbles. Why?
Answer: Chalk consists of pores forming capillaries. When it is immersed in water, the water begins to rise in the capillaries and air present there is expelled in the form of bubbles.

3. Question: Why does a liquid remain hot or cold for a long time inside a thermos flask?
Answer: The presence of air, a poor conductor of heat, between the double glass wall of a thermos flask, keeps the liquid hot or cold inside a flask for a long time.

4. Question: Why does a ball bounce upon falling?
Answer: When a ball falls, it is temporarily deformed. Because of elasticity, the ball tends to regain its original shape for which it presses the ground and bounces up (Newton's Third Law of Motion).

5 Question: Why is standing in boats or double decker buses not allowed, particularly in the upper deck of buses?
Answer: On tilting the centre of gravity of the boat or bus is lowered and it is likely to overturn.

6. Question: Why is it recommended to add salt to water while boiling dal?
Answer: By addition of salt, the boiled point of water gets raised which helps in cooking the dal sooner.

7. Question: Why is it the boiling point of sea water more than that of pure water?
Answer: Sea water contains salt, and other impurities which cause an elevation in its boiling point.

8. Question: Why is it easier to spray water to which soap is added?
Answer: Addition of soap decreases the surface tension of water. The energy for spraying is directly proportional to surface tension.

9. Question: Which is more elastic, rubber or steel?
Answer: Steel is more elastic for the same stress produced compared with rubber.

10. Question: Why is the sky blue?
Answer: Violet and blue light have short waves which are scattered more than red light waves. While red light goes almost straight through the atmosphere, blue and violet light are scattered by particles in the atmosphere. Thus, we see a blue sky.

11. Question: Why Does ink leak out of partially filled pen when taken to a higher altitude?
Answer: As we go up, the pressure and density of air goes on decreasing. A Partially filled pen leaks when taken to a higher altitude because the pressure of air acting on the ink inside the tube of the pen is greater than the pressure of the air outside.

12. Question: On the moon, will the weight of a man be less or more than his weight on the earth?
Answer: The gravity of the moon is one-sixth that of the earth; hence the weight of a person on the surface of the moon will be one-sixth of his actual weight on earth.

13. Question: Why do some liquid burn while others do not?
Answer: A liquid burns if its molecules can combine with oxygen in the air with the production of heat. Hence, oil burns but water does not.

14. Question: Why can we see ourselves in a mirror?
Answer: We see objects when light rays from them reach our eyes. As mirrors have a shiny surface, the light rays are reflected back to us and enter our eyes.

15. Question: Why does a solid chunk of iron sink in water but float in mercury?
Answer: Because the density of iron is more than that of water bus less than that of mercury.

16. Question: Why is cooking quicker in a pressure cooker?
Answer: As the pressure inside the cooker increases, the boiling point of water is raised, hence, the cooking process is quicker.

17. Question: When wood burns it crackles. Explain?
Answer: Wood contains a complex mixture of gases and tar forming vapors trapped under its surface. These gases and tar vapors escape, making a cracking sound.

18. Question: Why do stars twinkle?
Answer: The light from a star reaches us after refraction as it passes through various layers of air. When the light passes through the earth?s atmosphere, it is made to flicker by the hot and cold ripples of air and it appears as if the stars are twinkling.

19. Question: Why is it easier to roll a barrel than to pull it?
Answer: Because the rolling force of friction is less than the dynamic force of sliding friction.

20. Question: If a feather, a wooden ball and a steel ball fall simultaneously in a vacuum, which one of these would fall faster?
Answer: All will fall at the same speed in vacuum because there will be no air resistance and the earth?s gravity will exert a similar gravitational pull on all.

21. Question: When a man fires a gun, he is pushed back slightly. Why?
Answer: As the bullet leaves the nozzle of the gun?s barrel with momentum in a forward direction, as per Newton's Third Law of Motion, the ejection imparts to the gun as equal momentum in a backward direction.

22. Question: Ice wrapped in a blanket or saw dust does not melt quickly. Why?
Answer: Both wood and wool are bad conductors of heat. They do not permit heat rays to reach the ice easily.

23. Question: Why do we perspire on a hot day?
Answer: When the body temperature rises, the sweat glands are stimulated to secrete perspiration. It is nature's way to keep the body cool. During the process of evaporation of sweat, body heat is taken away, thus giving a sense of coolness.

24. Question: Why does ice float on water but sink in alcohol?
Answer: Because ice is lighter than water it floats on it. However, ice is heavier than alcohol and therefore it sinks in alcohol.

25. Question: Why do we perspire before rains?
Answer: Before the rain falls, the atmosphere gets saturated with water vapors; as a result, the process of evaporation of sweat is delayed.

26. Question: Why does a thermometer kept in boiling water show no change in reading after 1000C?
Answer: The boiling point of water is 1000C. Once water starts boiling at this temperature, thermometer records no change in temperature. The quantity of heat supplied is being utilized as latent heat of evaporation to convert the water at boiling point into vapour.

27. Question: Why do we bring our hands close to the mouth while shouting across to someone far away?
Answer: By keeping hands close to mouth the sound is not allowed to spread (Phenomenon of diffraction of sound) in all direction, but is directed to a particular direction and becomes louder.

28. Question: Why does a corked bottle filled with water burst if left out on a frosty night?
Answer: Because of low temperature the water inside the bottle freezes. On freezing it expands, thereby its volume increases and pressure is exerted on the walls.

29. Question: Why is a small gap left at the joint between two rails?
Answer: To permit expansion of rails due to heat generated by friction of a moving train.

30. Question: Why cannot a copper wire be used to make elements in electric heater?
Answer: Copper melts at 108.30C and forms a black powder on reacting with atmospheric oxygen. For heater elements a metal should have more resistance to produce heat.

31. Question: Why are water or mercury droplets always round when dropped on a clean glass?
Answer: The surface of a liquid is the seat of a special force as a result of which molecules on the surface are bound together to form something like a stretched membrane. They tend to compress the molecules below to the smallest possible volume, which causes the drop to take a round shape as for a given mass he sphere has minimum volume.

32. Question: Why does a balloon filled with hydrogen rise in the air?
Answer: Weight of hydrogen is less than the weight of air displaced by it. In balloons hydrogen is normally filled because it is lighter than air.

33. Question: Why do we lean forward while climbing a hill?
Answer: In order to keeps the vertical line passing through our centre of gravity always between our feet, which is essential to attain equilibrium or stability.

34. Question: Why does smoke curl up in the air?
Answer: Smoke contains hot gases which being lighter in weight, follows a curved path because of the eddy currents that are set up in the air.

35. Question: Why does an electric bulb explode when it is broken?
Answer: The bulb encompasses partial vacuum and as it breaks, air rushes in causing a small explosion.

36. Question: Why does a man fall forward when he jumps out of a running train or bus?
Answer: He is in motion while in the train or bus. When he jumps out, his feet comes to rest while touching the ground but his upper portion which is still in motion propels him forward.

37. Question: Why does an ordinary glass tumbler crack when very hot tea or milk is poured in it?
Answer: When a hot liquid is poured into a tumbler, the inner layer of the tumbler gets heated, it expands before the outer layer and an unequal expansion of both layers causes the tumbler to crack.

38. Question: Why is a compass used as an indicator of direction?
Answer: The magnetic needles of a compass under the influence f the earth?s magnetic field lie in a north-south direction. Hence, we can identify direction.

39. Question: Why is water from a hand pump warm in winter and cold in summer?
Answer: In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.

41. Question: Why is a rainbow seen after a shower?
Answer: After a shower, the clouds containing water droplets act like a prism through which the white light is dispersed producing a spectrum.

42. Question: Why does a swimming pool appear less deep than is actually is?
Answer: The rays of light coming from the bottom of the pool pass from a denser medium (water) to a rarer medium (air) and are refracted (bend away from the normal). When the rays return to the surface, they form an image of the bottom of the pool at a point, which is little above the real position.

43. Question: Why is one?s breath visible in winter but not in summer?
Answer: In winter, water vapor contained in the breath condenses into small droplets, which become visible but in summer they are quickly evaporated and not seen.

44. Question: Why doesn?t the electric filament in an electric bulb burn up?
Answer: Firstly, because is made of tungsten which has a very high melting point (34100C) whereas the temperature of the filament required to glow is only 2700oC. Secondly, oxygen is absent since the bulb is filled with an inert gas which does not help in burning.

45. Question: Why does blotting paper absorb ink?
Answer: Blotting paper has fine pores, which act like capillaries. When a portion of blotting paper is brought in contact with ink, ink enters the pores due to surface tension (capillary action f liquids) and is absorbed.

46. Question: Why does a small iron sink in water but a large ship float?
Answer: The weight of water displaced by an iron ball is less than its own weight, whereas water displaced by the immersed portion of a ship is equal to its weight (Archimedes? Principle).

47. Question: Why does ice float on water?
Answer: The weight of the ice block is equal to the weight of the liquid displaced by the immersed portion of the ice.

48. Question: Why does moisture gather outside a tumbler containing cold water?
Answer: The water vapour in the air condenses on cooling and appears as droplets of water.

49. Question: Why does kerosene float on water?
Answer: Because the density of kerosene is less than that of water. For the same reason cream rises in milk and floats at the top.

50. Question: Why is the water in an open pond cool even on a hot summer day?
Answer: As the water evaporates from the open surface of a pond, heat is taken away in the process, leaving the surface cool.

51. Question: Why is it less difficult to cook rice or potatoes at higher altitudes?
Answer: Atmospheric pressure at higher altitudes is low and boils water below 1000C. The boiling point of water is directly proportional to the pressure on its surface.

52. Question: Why is it difficult to breathe at higher altitudes?
Answer: Because of low air pressure at higher altitudes the quantity of air is less, and so that of oxygen.

53. Question: Why are winter nights and summer nights warmer during cloudy weather than when the sky is clear?
Answer: Clouds being bad conductors of heat do not permit radiation of heat from land to escape into the sky. As this heat remains in the atmosphere, the cloudy nights are warmer.

54. Question: Why is a metal tyre heated before it is fixed on wooden wheels?
Answer: On heating, the metal tyre expands by which its circumference also increases. This makes fixing the wheel easier and therefore cooling down shrinks it; thus fixing the tyre tightly.

55. Question: Why is it easier to swim in the sea than in a river?
Answer: The density of sea water is higher; hence the up thrust is more than that of river water.

56. Question: Who will possibly learn swimming faster-a fat person or a thin person?
Answer: The fat person displaces more water which will help him float much more freely compared to a thin person.

57. Question: Why is a flash of lightening seen before thunder?
Answer: Because light travels faster than sound, it reaches the earth before the sound of thunder.

58. Question: Why cannot a petrol fire be extinguished by water?
Answer: Water, which is heavier than petrol, slips down permitting the petrol to rise to the surface and continue to burn. Besides, the existing temperature is so high that the water poured on the fire evaporates even before it can extinguish the fire. The latter is true if a small quantity of water is poured.

59. Question: Why does water remain cold in an earthen pot?
Answer: There are pores in an earthen pot which allow water to percolate to the outer surface. Here evaporation of water takes place thereby producing a cooling effect.

60. Question: Why do we place a wet cloth on the forehead of a patient suffering from high temperature?
Answer: Because of body?s temperature, water evaporating from the wet cloth produces a cooling effect and brings the temperature down.

61. Question: When a needle is placed on a small piece of blotting paper which is place on the surface of clean water, the blotting paper sinks after a few minutes but the needle floats. However, in a soap solution the needle sinks. Why?
Answer: The surface tension of clean water being higher than that of a soap solution, it cans support the weight of a needle due to its surface tension. By addition of soap, the surface tension of water reduces, thereby resulting in the sinking of the needle.

62. Question: To prevent multiplication of mosquitoes, it is recommended to sprinkle oil in the ponds with stagnant water. Why?
Answer: Mosquitoes breed in stagnant water. The larvae of mosquitoes keep floating on the surface of water due to surface tension. However, when oil is sprinkled, the surface tension is lowered resulting in drowning and death of the larvae.

63. Question: Why does oil rise on a cloth tape of an oil lamp?
Answer: The pores in the cloth tape suck oil due to the capillary action of oil.

64. Question: Why are ventilators in a room always made near the roof?
Answer: The hot air being lighter in weight tends to rise above and escape from the ventilators at the top. This allows the cool air to come in the room to take its place.

65. Question: How does ink get filled in a fountain pen?
Answer: When the rubber tube of a fountain pen immersed in ink is pressed, the air inside the tube comes out and when the pressure is released the ink rushes in to fill the air space in the tube.

66. Question: Why are air coolers less effective during the rainy season?
Answer: During the rainy reason, the atmosphere air is saturated with moisture. Therefore, the process of evaporation of water from the moist pads of the cooler slows down thereby not cooling the air blown out from the cooler.

67. Question: Why does grass gather more dew in nights than metallic objects such as stones?
Answer: Grass being a good radiator enables water vapour in the air to condense on it. Moreover, grass gives out water constantly (transpiration) which appears in the form of dew because the air near grass is saturated with water vapour and slows evaporation. Dew is formed on objects which are good radiations and bad conductors.

68. Question: If a lighted paper is introduced in a jar of carbon dioxide, its flame extinguishes. Why?
Answer: Because carbon dioxide does not help in burning. For burning, oxygen is required.

69. Question: Why does the mass of an iron increase on rusting?
Answer: Because rust is hydrated ferric oxide which adds to the mass of the iron rod. The process of rusting involves addition of hydrogen and oxygen elements to iron.

70. Question: Why does milk curdle?
Answer: Lactose (milk sugar) content of milk undergoes fermentation and changes into lactic acid which on reacting with milk protein (casein) form curd.

71. Question: Why does hard water not lather soap profusely?
Answer: Hard water contains sulphates and chlorides of magnesium and calcium which forms an insoluble compound with soap. Therefore, soap does not lather with hard water.

72. Question: Why is it dangerous to have charcoal fire burning in a closed room?
Answer: When charcoal burns it produces carbon monoxide which is suffocating and can cause death.

73. Question: Why is it dangerous to sleep under trees at night?
Answer: Plants respire at night and give out carbon dioxide which reduces the oxygen content of air required for breathing.

74. Question: Why does ENO's salt effervesce on addition of water?
Answer: It contains tartaric acid and sodium bicarbonate. On adding water, carbon dioxide is produced which when released into water causes effervescence.

75. Question: Why does milk turn sour?
Answer: The microbes react with milk and grow. They turn lactose into lactic acid which is sour in taste.

76. Question: Why is a new quilt warmer than an old one?
Answer: In a new quilt the cotton is not compressed and as such it encloses more air which is bad conductor of heat. Therefore, it does not allow heat to pass.

77. Question: Curved rail tracks or curved roads are banked or raised on one side. Why?
Answer: Because a fast moving train or vehicle leans inwards while taking turn and the banked or raised track provides required centripetal force to enable it to move round the curve.

78. Question: How do bats fly in dark?
Answer: When bats fly they produce ultrasonic sound waves which are reflected back to them from the obstacles in their way and hence they can fly without difficulty.

79. Question: Water pipes often burst at hill stations on cold frosty nights. Why?
Answer: The temperature may fall below 00C during cold frosty nights which converts the water inside the pipes into ice, resulting in an increase in volume. This exerts great force on the pipes and as a result, they burst.

80. Question: Why are white clothes more comfortable in summer than dark or black ones?
Answer: White clothes are good reflectors and bad absorbers of heat, whereas dark or black clothes are good absorbers of heat. Therefore, white clothes are more comfortable because they do not absorb heat from the sun rays.

81. Question: Why does a rose appear red grass green in daylight?
Answer: Rose absorbs all the constituent colors of white light except red which is reflected to us. Similarly, grass absorbs all colors except green which is reflected t us.

82. Question: Why does a ship rise as it enters the sea from a river?
Answer: The density of sea water is high due to impurities and salts compared to river water as a result; the upthurst produced by the sea water on the ship is more than that of river water.

83. Question: Why are fuse provided in electric installations?
Answer: A safety fuse is made of a wire of metal having a very low melting point. When excess current flows in, the wire gets heated, melts and breaks the circuit. By breaking the circuit it saves electric equipment or installations from damage by excessive flow of current.

84. Question: Why is it easier to lift a heavy object under water than in air?
Answer: Because when a body is immersed in water, it experiences an upward thrust (Archimedes? Principle) and loses weight equal to the weight of the water displaced by its immersed potion, and hence, is easier to lift objects.

85. Question: If a highly pumped up bicycle tyre is left in the hot sunlight, it bursts. Why?
Answer: The air inside the tube increases in volume when heated up. As sufficient space for the expansion of the air is not available because the tube is already highly pumped, it may result in bursting of the tyre.

86. Question: What will be the color of green in blue light?
Answer: Grass will appear dark in color because it absorbs all other colors of the light except its own green color. The blue light falling on grass will be absorbed by it, and hence, it will appear dark in color.

87. Question: Why do two eyes give better vision than one?
Answer: Because two eyes do not form exactly similar images and he fusion of these two dissimilar images in the brain gives three dimensions of the stereoscopic vision.

More than 100 Keyboard Shortcuts
Keyboard Shorcuts (Microsoft Windows)

1. CTRL+C (Copy)
2. CTRL+X (Cut)
3. CTRL+V (Paste)
4. CTRL+Z (Undo)
5. DELETE (Delete)
6. SHIFT+DELETE (Delete the selected item permanently without placing the item in the Recycle Bin)
7. CTRL while dragging an item (Copy the selected item)
8. CTRL+SHIFT while dragging an item (Create a shortcut to the selected item)
9. F2 key (Rename the selected item)
10. CTRL+RIGHT ARROW (Move the insertion point to the beginning of the next word)
11. CTRL+LEFT ARROW (Move the insertion point to the beginning of the previous word)
12. CTRL+DOWN ARROW (Move the insertion point to the beginning of the next paragraph)
13. CTRL+UP ARROW (Move the insertion point to the beginning of the previous paragraph)
14. CTRL+SHIFT with any of the arrow keys (Highlight a block of text)
SHIFT with any of the arrow keys (Select more than one item in a window or on the desktop, or select text in a document)
15. CTRL+A (Select all)
16. F3 key (Search for a file or a folder)
17. ALT+ENTER (View the properties for the selected item)
18. ALT+F4 (Close the active item, or quit the active program)
19. ALT+ENTER (Display the properties of the selected object)
20. ALT+SPACEBAR (Open the shortcut menu for the active window)
21. CTRL+F4 (Close the active document in programs that enable you to have multiple documents open simultaneously)
22. ALT+TAB (Switch between the open items)
23. ALT+ESC (Cycle through items in the order that they had been opened)
24. F6 key (Cycle through the screen elements in a window or on the desktop)
25. F4 key (Display the Address bar list in My Computer or Windows Explorer)
26. SHIFT+F10 (Display the shortcut menu for the selected item)
27. ALT+SPACEBAR (Display the System menu for the active window)
28. CTRL+ESC (Display the Start menu)
29. ALT+Underlined letter in a menu name (Display the corresponding menu) Underlined letter in a command name on an open menu (Perform the corresponding command)
30. F10 key (Activate the menu bar in the active program)
31. RIGHT ARROW (Open the next menu to the right, or open a submenu)
32. LEFT ARROW (Open the next menu to the left, or close a submenu)
33. F5 key (Update the active window)
34. BACKSPACE (View the folder one level up in My Computer or Windows Explorer)
35. ESC (Cancel the current task)
36. SHIFT when you insert a CD-ROM into the CD-ROM drive (Prevent the CD-ROM from automatically playing)

Dialog Box Keyboard Shortcuts

1. CTRL+TAB (Move forward through the tabs)
2. CTRL+SHIFT+TAB (Move backward through the tabs)
3. TAB (Move forward through the options)
4. SHIFT+TAB (Move backward through the options)
5. ALT+Underlined letter (Perform the corresponding command or select the corresponding option)
6. ENTER (Perform the command for the active option or button)
7. SPACEBAR (Select or clear the check box if the active option is a check box)
8. Arrow keys (Select a button if the active option is a group of option buttons)
9. F1 key (Display Help)
10. F4 key (Display the items in the active list)
11. BACKSPACE (Open a folder one level up if a folder is selected in the Save As or Open dialog box)

Microsoft Natural Keyboard Shortcuts

1. Windows Logo (Display or hide the Start menu)
2. Windows Logo+BREAK (Display the System Properties dialog box)
3. Windows Logo+D (Display the desktop)
4. Windows Logo+M (Minimize all of the windows)
5. Windows Logo+SHIFT+M (Restore the minimized windows)
6. Windows Logo+E (Open My Computer)
7. Windows Logo+F (Search for a file or a folder)
8. CTRL+Windows Logo+F (Search for computers)
9. Windows Logo+F1 (Display Windows Help)
10. Windows Logo+ L (Lock the keyboard)
11. Windows Logo+R (Open the Run dialog box)
12. Windows Logo+U (Open Utility Manager)
13. Accessibility Keyboard Shortcuts
14. Right SHIFT for eight seconds (Switch FilterKeys either on or off)
15. Left ALT+left SHIFT+PRINT SCREEN (Switch High Contrast either on or off)
16. Left ALT+left SHIFT+NUM LOCK (Switch the MouseKeys either on or off)
17. SHIFT five times (Switch the StickyKeys either on or off)
18. NUM LOCK for five seconds (Switch the ToggleKeys either on or off)
19. Windows Logo +U (Open Utility Manager)
20. Windows Explorer Keyboard Shortcuts
21. END (Display the bottom of the active window)
22. HOME (Display the top of the active window)
23. NUM LOCK+Asterisk sign (*) (Display all of the subfolders that are under the selected folder)
24. NUM LOCK+Plus sign (+) (Display the contents of the selected folder)
25. NUM LOCK+Minus sign (-) (Collapse the selected folder)
26. LEFT ARROW (Collapse the current selection if it is expanded, or select the parent folder)
27. RIGHT ARROW (Display the current selection if it is collapsed, or select the first subfolder)

Shortcut Keys for Character Map
After you double-click a character on the grid of characters, you can move through the grid by using the keyboard shortcuts:

1. RIGHT ARROW (Move to the right or to the beginning of the next line)
2. LEFT ARROW (Move to the left or to the end of the previous line)
3. UP ARROW (Move up one row)
4. DOWN ARROW (Move down one row)
5. PAGE UP (Move up one screen at a time)
6. PAGE DOWN (Move down one screen at a time)
7. HOME (Move to the beginning of the line)
8. END (Move to the end of the line)
9. CTRL+HOME (Move to the first character)
10. CTRL+END (Move to the last character)
11. SPACEBAR (Switch between Enlarged and Normal mode when a character is selected)

Microsoft Management Console (MMC)

Main Window Keyboard Shortcuts

1. CTRL+O (Open a saved console)
2. CTRL+N (Open a new console)
3. CTRL+S (Save the open console)
4. CTRL+M (Add or remove a console item)
5. CTRL+W (Open a new window)
6. F5 key (Update the content of all console windows)
7. ALT+SPACEBAR (Display the MMC window menu)
8. ALT+F4 (Close the console)
9. ALT+A (Display the Action menu)
10. ALT+V (Display the View menu)
11. ALT+F (Display the File menu)
12. ALT+O (Display the Favorites menu)

MMC Console Window Keyboard Shortcuts

1. CTRL+P (Print the current page or active pane)
2. ALT+Minus sign (-) (Display the window menu for the active console window)
3. SHIFT+F10 (Display the Action shortcut menu for the selected item)
4. F1 key (Open the Help topic, if any, for the selected item)
5. F5 key (Update the content of all console windows)
6. CTRL+F10 (Maximize the active console window)
7. CTRL+F5 (Restore the active console window)
8. ALT+ENTER (Display the Properties dialog box, if any, for the selected item)
9. F2 key (Rename the selected item)
10. CTRL+F4 (Close the active console window. When a console has only one console window, this shortcut closes the console)

Remote Desktop Connection Navigation

1. CTRL+ALT+END (Open the Microsoft Windows NT Security dialog box)
2. ALT+PAGE UP (Switch between programs from left to right)
3. ALT+PAGE DOWN (Switch between programs from right to left)
4. ALT+INSERT (Cycle through the programs in most recently used order)
5. ALT+HOME (Display the Start menu)
6. CTRL+ALT+BREAK (Switch the client computer between a window and a full screen)
7. ALT+DELETE (Display the Windows menu)
8. CTRL+ALT+Minus sign (-) (Place a snapshot of the active window in the client on the Terminal server clipboard and provide the same functionality as pressing PRINT SCREEN on a local computer.)
9. CTRL+ALT+Plus sign (+) (Place a snapshot of the entire client window area on the Terminal server clipboard and provide the same functionality as pressing ALT+PRINT SCREEN on a local computer.)

Microsoft Internet Explorer Navigation

1. CTRL+B (Open the Organize Favorites dialog box)
2. CTRL+E (Open the Search bar)
3. CTRL+F (Start the Find utility)
4. CTRL+H (Open the History bar)
5. CTRL+I (Open the Favorites bar)
6. CTRL+L (Open the Open dialog box)
7. CTRL+N (Start another instance of the browser with the same Web address)
8. CTRL+O (Open the Open dialog box, the same as CTRL+L)
9. CTRL+P (Open the Print dialog box)
10. CTRL+R (Update the current Web page)
11. CTRL+W (Close the current window)