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- Question
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
- Correct Answer
- Moment of force
- 1. 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
- 2. which of the following physical quantity is dimensionless
Options- A. angle
- B. strain
- C. specific gravity
- D. all of these Discuss
- 3. In a Cinema hall, the distance between the projector and the screen is increased by 2%. Then the intensity of illumination on the screen is
Options- A. decreased by 2%
- B. decreased by 4%
- C. increased by 2%
- D. increased by 4% Discuss
- 4. A periscope works by the principle of
Options- A. Total internal reflection
- B. Refraction
- C. Diffraction
- D. Reflection & Refraction Discuss
- 5. Erg cross Sec is the unit of
Options- A. Angular momentum
- B. Linear Momentum
- C. Planck's constant
- D. Energy Discuss
- 6. 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
- 7. 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
- 8. Which of the following has the highest frequency?
Options- A. Cosmic rays
- B. X-rays
- C. Radio waves
- D. Microwaves Discuss
- 9. 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
- 10. Optical fiber works on the principle of
Options- A. Scattering
- B. interference
- C. total internal reflection
- D. refraction Discuss
Physics problems
Search Results
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: decreased by 4%
Correct Answer: Total internal reflection
Correct Answer: Planck's constant
Correct Answer: the specific heat capacity of A is less than that of B
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: Cosmic rays
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
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