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- Question
In each of the questions, four alternatives are given for the Idiom/Phrase. Choose the alternative which best expresses the meaning of the Idiom/Phrase and click the button corresponding to it. Couch potato
Options- A. An old person who has oldfashioned ideas.
- B. A person who prefers to watch television.
- C. A person who does not seem very friendly.
- D. Someone who stays calm and does not show their emotions.
- Correct Answer
- A person who prefers to watch television.
- 1. Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
Options- A. 1.8 km, 0.15 km
- B. 2.2 km, 0.20 km
- C. 2.8 km, 0.25 km
- D. 3.3 km, 0.30 km Discuss
- 2. One watt-hour is equivalent to
Options- A. 6.3 x 103 J
- B. 6.3 x 10-7 J
- C. 3.6 x 103 J
- D. 3.6 x 10-3 J Discuss
- 3. oil raise up the wick in a lamp. The principle involves
Options- A. the diffusion of oil through the wick
- B. the liquid state of oil
- C. capillary action phenomenon
- D. volatility of oil Discuss
- 4. Suitable impurities are added to a semiconductor depending on its use. This is done in order to
Options- A. increase its life
- B. enable it to withstand higher voltages
- C. increase its electrical conductivity
- D. increase its electrical resistivity Discuss
- 5. 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
- 6. Siphon will fail to work if
Options- A. the densities of the liquid in the two vessels are equal
- B. the level of the liquid in the two vessels are at the same height
- C. both its limbs are of unequal length
- D. the temperature of the liquids in the two vessels are the same Discuss
- 7. Lux is the SI unit of
Options- A. intensity of illumination
- B. luminous efficiency
- C. luminous flux
- D. luminous intensity Discuss
- 8. 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
- 9. Railway tracks are banked on curves
Options- A. necessary centrifugal force may be obtained from the horizontal component weight of the train
- B. to avoid frictional force between the tracks and wheels
- C. necessary centripetal force may be obtained from the horizontal component of the weight of the train
- D. the train may not fly off in the opposite direction Discuss
- 10. Mica is used in electrical appliances such as electric iron because mica is
Options- A. a good conductor of heat but a bad conductor of electricity
- B. a bad conductor of heat but a good conductor of electricity
- C. a good conductor of heat as well as electricity
- D. a bad conductor of heat as well as electricity Discuss
More questions
Correct Answer: 3.3 km, 0.30 km
Correct Answer: 3.6 x 103 J
Correct Answer: capillary action phenomenon
Correct Answer: increase its electrical conductivity
Correct Answer: offer no resistance to the flow of electricity
Correct Answer: the level of the liquid in the two vessels are at the same height
Correct Answer: intensity of illumination
Explanation:
The SI unit of intensity of illumination (illuminance) is the lux. An illuminance of 1.0 lux is produced by 1.0 lumen of light shining on an area of 1.0 m^2.
Correct Answer: does not move
Correct Answer: necessary centripetal force may be obtained from the horizontal component of the weight of the train
Correct Answer: a good conductor of heat but a bad conductor of electricity
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