light, heat, thermodynamics, wave motion, sound, optics & oscillations - Category wise Question and Answer Practice Test with Solutions
light, heat, thermodynamics, wave motion, sound, optics & oscillations PRACTICE TEST [16 - EXERCISES]
set 1
set 2
set 3
set 4
set 5
set 6
set 7
set 8
set 9
set 10
set 11
set 12
set 13
set 14
set 15
set 16
Question : 11
Consider the following statements:
- Water kept in an open vessel will quickly evaporate on the surface of the moon.
- The temperature at the surface of the moon is much higher than boiling point of the water.
- Two bodies at different temperatures, if brought in contact do not necessary settle to the mean temperature.
- The two bodies may have different thermal capacities.
a) 2 and 3
b) 2, 3 and 4
c) 1, 2 and 3
d) 1, 2, 3 and 4
Answer »Answer: (d)
Heat is transferred between two or more systems or a system and its surrounding by virtue of temperature difference.
Question : 12
Consider the following statements:
- If a person looks at a coin which is in a bucket of water, the coin will appear to be closer than it really is.
- If a person under water looks at a coin above the water surface, the coin will appear to be at a higher level than it really is.
a) 2 only
b) 1 and 2
c) 1 only
d) None
Answer »Answer: (b)
Refraction is the change in direction of a wave due to a change in its speed. This is most commonly observed when a wave passes from one medium to another at any angle other than 90° or 0°.
The refraction of light is the most commonly observed phenomenon.
In both cases, the phenomenon of refraction is applicable because there will be a change in the direction and speed as light enters from one media to other. In case 1 light for an observer outside water the light ray is travelling from a denser medium (water) to a rarer medium (air).
Thus, the image of the coin will appear closer due to refraction. Whereas in case 2 for the observer underwater refraction also takes place but in the opposite way as light travels from a rarer medium (air) to a denser medium (water) .
Thus, the image of the coin will appear at a higher level than the actual position of the coin.
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» Measurement And SI Units
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» Mechanics (Mass, Force, Acceleration, Work, Energy, Momentum, Velocity)
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