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- Question
Which of the following has the highest frequency?
Options- A. Cosmic rays
- B. X-rays
- C. Radio waves
- D. Microwaves
- Correct Answer
- Cosmic rays
- 1. The image of an object formed on the retina of the eye is
Options- A. virtual and upright
- B. virtual and inverted
- C. real and inverted
- D. Real and upright Discuss
- 2. Two bodies A and B are of same mass and same amount of heat is given to both of them. If the temperature of A increases more than that of B because of heat addition, then
Options- A. the specific heat capacity of A is more than that of B
- B. the specific heat capacity of A is less than that of B
- C. both A and B have the same specific heat capacity but A has greater thermal conductivity
- D. both A and B the same specific heat capacity but B has greater thermal conductivity Discuss
- 3. The rotational effect of a force on a body about an axis of rotation is described in terms of
Options- A. Centre of gravity
- B. Centripetal force
- C. Centrifugal force
- D. Moment of force Discuss
- 4. Fish and other aquatic creatures can live inside a deep frozen pond because
Options- A. fish are cold-blooded animals
- B. ice is a bad conductor of heat
- C. there will always be water just beneath the ice level
- D. they can adapt themselves to live in ice Discuss
- 5. which of the following physical quantity is dimensionless
Options- A. angle
- B. strain
- C. specific gravity
- D. all of these Discuss
- 6. At what temperature do the Fahrenheit and celcius scales give the same reading?
Options- A. 212 degrees
- B. 32 degreees
- C. -40 degreees
- D. 0 degreees Discuss
- 7. Optical fiber works on the principle of
Options- A. Scattering
- B. interference
- C. total internal reflection
- D. refraction Discuss
- 8. When one enters a dark room after being in bright light one is not able to see anything clearly for a while because
Options- A. the retina of the eye moves forward
- B. the retina of the eye moves backward
- C. the iris is unable to dilate the pupil immediately to be able to see things
- D. the eye has no power of accommodation Discuss
- 9. Quality of transmission depends upon
Options- A. Nature of signal only
- B. Nature of medium only
- C. Both (A) and (B)
- D. Neither A nor B Discuss
- 10. Carbon Arc lamps are commonly used in
Options- A. cinema projectors
- B. photography
- C. vehicles
- D. domestic lighting Discuss
Physics problems
Search Results
Correct Answer: real and inverted
Explanation:
Although the image is inverted the mental interpretation of the effect on the retina is as though it is erect
Correct Answer: the specific heat capacity of A is less than that of B
Correct Answer: Moment of force
Correct Answer: there will always be water just beneath the ice level
Explanation:
Water has the maximum density at . So at this temperature, it sinks down to bottom and stays here. If it cools further, it will become less dense and move up. So while the upper layers can cool enough to form ice, the bottom layers remain as water at .
Therefore, (C) is correct.
Correct Answer: all of these
Correct Answer: -40 degreees
Explanation:
We want the temperature when F=C.
We know that,
So substituting C For F, we have C =
Therefore, C = -40.
Thus when C = -40, we have C = F
Correct Answer: total internal reflection
Correct Answer: the iris is unable to dilate the pupil immediately to be able to see things
Explanation:
The size of the pupil of the eye automatically adjusts itself according to the intensity of light passing through it;if the intensity is more , the size is less, if less, it is more. So in our case the pupil should dilate i.e, increase in size to be able to see in the dark . This switchover takes sometime. But here the entry into the dark room is immediate . So the eye has no time to adjust itself and hence is not able to see at all for a while.
Correct Answer: Both (and (B)
Explanation:
Quality of transmission is governed both by nature of signal and nature of communication channel/medium.
Correct Answer: cinema projectors
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