Physics problems
- 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
Correct Answer: does not move
- 2. 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 Discuss
Correct Answer: refraction and reflection of sunlight by water droplets
- 3. 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
Correct Answer: offer no resistance to the flow of electricity
- 4. 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
Correct Answer: the rolling friction is much less than the sliding friction
- 5. 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
Correct Answer: Electrical
- 6. 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
Correct Answer: normal atmospheric pressure is maintained by the use of air pumps
- 7. 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
Correct Answer: move towards B
- 8. It is easier to roll a stone up a sloping road than to lift it vertical upwards because
Options- A. work done in rolling is more than in lifting
- B. work done in lifting the stone is equal to rolling it
- C. work done in both is same but the rate of doing work is less in rolling
- D. work done in rolling a stone is less than in lifting it Discuss
Correct Answer: work done in rolling a stone is less than in lifting it
- 9. Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
Options- A. east
- B. west
- C. northeast
- D. southeast Discuss
Correct Answer: east
- 10. One should not connect a number of electrical appliances to the same power socket because
Options- A. this can damage the appliances due to overloading
- B. this can damage the domestic wiring due to overloading
- C. this can damage the electrical meter
- D. the appliance will not get full voltage Discuss
Correct Answer: this can damage the domestic wiring due to overloading
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