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- Question
Masses of stars and galaxies are usually expressed in terms of
Options- A. neutron mass
- B. earth's mass
- C. solar mass
- D. lunar mass
- Correct Answer
- solar mass
- 1. Which is best used as a sound absorbing material in partition walls ?
Options- A. Stone chips
- B. Steel
- C. Glass - wool
- D. Glass pieces Discuss
- 2. To produce deflection in a television picture tube:
Options- A. an electric field is used
- B. a magnetic field is used
- C. both electric and magnetic field are used
- D. none of the above Discuss
- 3. The minimum number of Non zero non collinear vectors required to produce a zero vector is
Options- A. 3
- B. 2
- C. 4
- D. 1 Discuss
- 4. The basic reason for the extraordinary sparkle of suitably cut diamond is that
Options- A. it has well defined cleavage planes
- B. it has a very high transparency
- C. it has a very high refractive index
- D. it is very hard Discuss
- 5. 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
- 6. A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance
Options- A. will increase
- B. will decrease
- C. does not change
- D. varies with the increase of depth of the immersion of the iron piece Discuss
- 7. The rate of change of linear momentum of a body falling freely under gravity is equal to it's ____ ?
Options- A. Kinetic Energy
- B. Weight
- C. Potential Energy
- D. Impulse Discuss
- 8. Pieces of camphor placed on water move about rapidly. This is because of
Options- A. diffusion
- B. viscosity
- C. surface tension
- D. capillarity Discuss
- 9. When body is accelerated
Options- A. its velocity never changes
- B. its speed always changes
- C. its direction always changes
- D. its speed may or maynot change Discuss
- 10. In a freezer ice cubes will be formed more quickly in trays made of
Options- A. rubber
- B. plastic
- C. aluminium
- D. wood Discuss
Physics problems
Search Results
Correct Answer: Glass - wool
Explanation:
Materials that do not transfer mechanical energy well. These tend to be soft,flexible, low density, and with high surface area to linear area ratios.
Correct Answer: a magnetic field is used
Correct Answer: 3
Correct Answer: it has a very high refractive index
Correct Answer: cool and moist
Correct Answer: will increase
Explanation:
When the piece of iron is lowered into the water, the water level in the bucket increases. And so the pressure at the bottom of bucket also increases. Thus the total thrust at the botto also increases. Therefore the spring balance reading increases.
Correct Answer: Weight
Explanation:
Rate of change of impulse equals the force . In case of freely falling body the only force is the weight.
Correct Answer: surface tension
Explanation:
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. The stronger pull exerted by the uncontaminated portion of water brings about a movement of the surface and the camphor particles are carried along with it. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
Correct Answer: its speed may or maynot change
Correct Answer: aluminium
Explanation:
Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.
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