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]

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set 11

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set 16

Question : 11

Consider the following statements:

  1. Water kept in an open vessel will quickly evaporate on the surface of the moon.
  2. The temperature at the surface of the moon is much higher than boiling point of the water.
  3. Two bodies at different temperatures, if brought in contact do not necessary settle to the mean temperature.
  4. The two bodies may have different thermal capacities.
Which of the statements are correct?

a) 2 and 3

b) 2, 3 and 4

c) 1, 2 and 3

d) 1, 2, 3 and 4

Discuss »

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:

  1. 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.
  2. 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.
Which of the above statement(s) is/are correct?

a) 2 only

b) 1 and 2

c) 1 only

d) None

Discuss »

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.

Question : 13

Echo is a type of

a) neither reflected sound nor refracted sound

b) reflected sound

c) refracted sound

d) None of these

Discuss »

Answer: (b)

Question : 14 [UPPCS (Mains) 2006]

The time taken to reach the Sunlight up to the surface of Earth is approximately

a) 8.5 minutes

b) 4.8 sec

c) 4.2 sec

d) 3.6 hours

Discuss »

Answer: (a)

Question : 15 [NDA]

Figure given above shows the part of a long string in which transverse waves are produced. Which pair of points is in phase?

sound oscillations heat thermodynamics question answer 19

a) B and J

b) A and E

c) D and J

d) C and G

Discuss »

Answer: (d)

IMPORTANT general science mcq EXERCISES

set 8 Online Quiz

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1646 light thermodynamics sound optics and oscillations based general science mcq set 8 question answer pdf
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