Physics problems
- 1. 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
Correct Answer: a magnetic field is used
- 2. Which is best used as a sound absorbing material in partition walls ?
Options- A. Stone chips
- B. Steel
- C. Glass - wool
- D. Glass pieces Also asked in: AIEEE
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.
- 3. 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 Discuss
Correct Answer: solar mass
- 4. 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
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.
- 5. 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 Also asked in: AIEEE, Bank Exams, Bank Clerk
Correct Answer: Weight
Explanation:
Rate of change of impulse equals the force . In case of freely falling body the only force is the weight.
- 6. Pieces of camphor placed on water move about rapidly. This is because of
Options- A. diffusion
- B. viscosity
- C. surface tension
- D. capillarity Discuss
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.
- 7. 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
Correct Answer: its speed may or maynot change
- 8. In a freezer ice cubes will be formed more quickly in trays made of
Options- A. rubber
- B. plastic
- C. aluminium
- D. wood Discuss
Correct Answer: aluminium
Explanation:
Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing.
- 9. Skating on ice is possible because
Options- A. the surface of ice is smooth
- B. ice is cold
- C. the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
- D. the pressure on the ice due to skate raises its melting point Discuss
Correct Answer: the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water
Explanation:
Here is a case of lowering of melting point of ice with increase of pressure
- 10. Mirage is an example of
Options- A. Reflection of light & Refraction of light
- B. Dispersion of light
- C. Total Internal Reflection
- D. Refraction of light & Total Internal Reflection of light Also asked in: GRE, GATE, CAT, Bank Exams, AIEEE, IT Trainer, Bank PO, Bank Clerk, Analyst
Correct Answer: Refraction of light & Total Internal Reflection of light
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