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- Question
Large astronomical telescopes always use as objective
Options- A. lens
- B. mirror
- C. combinations of lenses
- D. None of the above
- Correct Answer
- combinations of lenses
- 1. Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
Options- A. Pressure and Young's modules
- B. Planck's constant and Angular momentum
- C. Impulse and moment of force
- D. Force and rate of change of linear momentum Discuss
- 2. ML2T-2 is the dimensional formula for
Options- A. moment of inertia
- B. pressure
- C. elasticity
- D. couple acting on a body Discuss
- 3. On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
Options- A. metals have higher thermal capacity than plastics
- B. plastics have a lower density than metals
- C. metals are good conductor of heat
- D. plastics have a higher thermal conductivity than metals Discuss
- 4. It takes much longer to cook food in the hills than in the plains, because
Options- A. in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
- B. due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
- C. in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere
- D. in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking Discuss
- 5. Light travels at the fastest speed in
Options- A. glass
- B. water
- C. hydrogen
- D. vacuum Discuss
- 6. Mercury is commonly used as a thermometric fluid rather than water because
Options- A. specific heat of mercury is less than water
- B. specific heat of mercury is more than water
- C. mercury has greater visibility than water
- D. density of mercury is more than the water Discuss
- 7. Supersonic plane fly with the speed
Options- A. less than the speed of sound
- B. of sound
- C. greater than the speed of sound
- D. of light Discuss
- 8. 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
- 9. Optical fibre works on the
Options- A. principle of refraction
- B. total internal reflection
- C. scattering
- D. interference Discuss
- 10. Lux is the SI unit of
Options- A. intensity of illumination
- B. luminous efficiency
- C. luminous flux
- D. luminous intensity Discuss
Physics problems
Search Results
Correct Answer: Impulse and moment of force
Correct Answer: couple acting on a body
Correct Answer: metals are good conductor of heat
Correct Answer: in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
Correct Answer: vacuum
Correct Answer: mercury has greater visibility than water
Correct Answer: greater than the speed of sound
Correct Answer: a good conductor of heat but a bad conductor of electricity
Correct Answer: total internal reflection
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.
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