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- Question
A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will
Options- A. increase
- B. decrease
- C. remain unaffected
- D. have its shape changed
- Correct Answer
- increase
ExplanationThe metal ball can be considered to be made up of several layers of thinner ones. On heating each of these layers will increase in radius. As the inner most layer also increases its radius, the volume inside it i.e, the volume of the hollow portion will also increase.
- 1. It is more difficult to walk on ice than on a concrete road because
Options- A. there is very little friction between the ice and feet pressing it
- B. ice is soft when compared to concrete
- C. there is more friction between the ice and feer
- D. None of these Discuss
- 2. When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of
Options- A. surface tension
- B. capillarity
- C. viscosity
- D. diffusion Discuss
- 3. Rain drops acquire spherical shape due to
Options- A. viscosity
- B. surface tension
- C. friction
- D. elasticity Discuss
- 4. If a sound travels from air to water, the quantity that remain unchanged is
Options- A. velocity
- B. frequency
- C. wavelength
- D. amplitude Discuss
- 5. An air bubble in water will act like a
Options- A. convex lens
- B. convex mirror
- C. concave lens
- D. concave mirror Discuss
- 6. What is the SI unit of pressure
Options- A. Pascal
- B. Dyne
- C. Newton
- D. Jule Discuss
- 7. Ultrasonic waves are used for stirring liquid solutions because they
Options- A. do not produce noise during the operation
- B. are easy to produce
- C. can produce perfectly homogeneous solutions
- D. do not produce chemical reactions in the solution Discuss
- 8. The core of an electromagnet is made of soft iron because soft iron has
Options- A. small susceptibility and small retentivity
- B. large susceptibility and small retentivity
- C. large density and large retentivity
- D. small density and large retentivity Discuss
- 9. Formation of shadows can be explained by
Options- A. rectilinear propagation of light
- B. reflection
- C. refraction
- D. total internal reflection Discuss
- 10. Air pressure is usually highest when the air is
Options- A. warm and moist
- B. cool and dry
- C. warm and dry
- D. cool and moist Discuss
Physics problems
Search Results
Correct Answer: there is very little friction between the ice and feet pressing it
Explanation:
It is the friction between the feet and the ground that helps us to walk. Without this friction we would slip and fall
Correct Answer: diffusion
Explanation:
Diffusion is the spreading - mixing of gases through molecular motion.
Correct Answer: surface tension
Correct Answer: frequency
Correct Answer: concave lens
Correct Answer: Pascal
Correct Answer: can produce perfectly homogeneous solutions
Correct Answer: large susceptibility and small retentivity
Correct Answer: rectilinear propagation of light
Explanation:
In this position, the head light will be at the principal focus so that the rays of light falling on the cancave mirror will be rendered parallel
Correct Answer: cool and moist
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