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- Question
Optical fiber works on the principle of
Options- A. Scattering
- B. interference
- C. total internal reflection
- D. refraction
- Correct Answer
- total internal reflection
- 1. 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
- 2. Which of the following has the highest frequency?
Options- A. Cosmic rays
- B. X-rays
- C. Radio waves
- D. Microwaves Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. 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
- 8. Carbon Arc lamps are commonly used in
Options- A. cinema projectors
- B. photography
- C. vehicles
- D. domestic lighting Discuss
- 9. Unit of solid angle is
Options- A. degree
- B. radian
- C. steradian
- D. radian second Discuss
- 10. Which of the following is a scalar quantity
Options- A. electric current
- B. electric field
- C. Acceleration
- D. linear momentum Discuss
Physics problems
Search Results
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: Cosmic rays
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: 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
Correct Answer: steradian
Correct Answer: electric current
Explanation:
A Scalar quantity is a quantity that has only magnitude but no direction as like vector.
Here in the given options, electric current is the only one which is scalar.
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