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- Question
Rainbow is due to
Options- A. absorption of sunlight in minute water droplets
- B. diffusion of sunlight through water droplets
- C. ionisation of water deposits
- D. refraction and reflection of sunlight by water droplets
- Correct Answer
- refraction and reflection of sunlight by water droplets
- 1. On a stationary sail boat, air is blown from a fan attached to the boat. The boat
Options- A. moves in opposite direction in which the air is blown
- B. does not move
- C. moves in the same direction in which air blows
- D. spins around Discuss
- 2. Materials for rain-proof coats and tents owe their water-proof properties to
Options- A. surface tension
- B. viscosity
- C. specific gravity
- D. elasticity Discuss
- 3. Solar eclipse will take place when
Options- A. the sun is between the moon and the earth
- B. the earth is between the moon and the sun
- C. the moon is between the sun and the earth
- D. the moon does not lie on the line joining the sun and the earth Discuss
- 4. Rectifiers are used to convert
Options- A. Direct current to Alternating current
- B. Alternating current to Direct current
- C. high voltage to low voltage
- D. low voltage to high voltage Discuss
- 5. Metals are good conductors of electricity because
Options- A. they contain free electrons
- B. the atoms are lightly packed
- C. they have high melting point
- D. All of the above Discuss
- 6. Superconductors are substances which
Options- A. conduct electricity at low temperature
- B. offer high resistance to the flow of current
- C. offer no resistance to the flow of electricity
- D. conduct electricity at high temperatures Discuss
- 7. It is easier to roll a barrel full of coal tar than to pull it because
Options- A. the full weight of the barrel comes into play when it is pulled
- B. the rolling friction is much less than the sliding friction
- C. more surface area of the barrel is in contact with the road when it is pulled
- D. coal tar is a liquid and it flows in the barrel when it is rolled Discuss
- 8. In which of the following industries is mica as a raw material?
Options- A. Cement
- B. Glass and Pottery
- C. Iron and Steel
- D. Electrical Discuss
- 9. Inside an aeroplane, flying at a high altitude,
Options- A. the pressure is the same as that outside
- B. normal atmospheric pressure is maintained by the use of air pumps
- C. the pressure inside is less than the pressure outside
- D. normal humidity and partial vacuum are maintained Discuss
- 10. Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
Options- A. move towards A
- B. move towards B
- C. move at right angles to the line joining A and B
- D. remain at rest Discuss
Physics problems
Search Results
Correct Answer: does not move
Correct Answer: surface tension
Correct Answer: the moon is between the sun and the earth
Correct Answer: Alternating current to Direct current
Correct Answer: they contain free electrons
Correct Answer: offer no resistance to the flow of electricity
Correct Answer: the rolling friction is much less than the sliding friction
Correct Answer: Electrical
Correct Answer: normal atmospheric pressure is maintained by the use of air pumps
Correct Answer: move towards B
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