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 : 6

Timbre is called the quality of sound. One can recognise the voice of a familiar human being or instrument without actually seeing them. This quality is associated with

a) overtones present in the sound

b) material of the body

c) shape of the body

d) all of the above

Discuss »

Answer: (d)

Question : 7

At a common temperature, a block of wood and a block of metal feel equally cold or hot. The temperatures of block and wood are

a) greater than temperature of the body

b) equal to the temperature of the body

c) less than the temperature of the body

d) either (b) or (c)

Discuss »

Answer: (b)

The temperatures of the block and wood are equal to the temperature of the body as both feel equally hot or cold.

Question : 8

Which of the following is carried by the waves from one place to another ?

a) Wavelength

b) Mass

c) Velocity

d) Energy

Discuss »

Answer: (d)

Question : 9

5g ice at 0ºC is mixed with 5g of steam at 100ºC . What is the final temperature?

a) 80ºC

b) 50ºC

c) 100ºC

d) 150ºC

Discuss »

Answer: (c)

Heat required by ice to raise its temperature to 100°C,

$Q_1 = m_1L_1 + m_1c_ 1Δϴ_1$ = 5 × 80 + 5 × 1 × 100 = 400 + 500 = 900 cal.

Heat given by steam when condensed,

$Q_2 = m_2L_2$ = 5 × 536 = 2680 cal as $Q_2 > Q_1$.

This means that whole steam is not even condensed.

Hence temperature of mixture will remain at 100°C.

Question : 10

When a CD (compact disc used in audio and video systems) is seen in sunlight, rainbow like colours are seen. This can be explained on the basis of the phenomenon of

a) diffraction and transmission

b) reflection and diffraction

c) reflection and transmission

d) refraction, diffraction and transmission

Discuss »

Answer: (d)

The reason CDs reflect rainbow colours is because they have a clear plastic coating on top of a mirrored surface. Light refracts (bends) when it moves from one medium (such as air) to another with a different optical density (such as the clear plastic surface of a CD).

Different wavelengths of light (every colour has a different wavelength) travel at different speeds so that the full spectrum appears when white light passes from the air through the plastic surface of a CD, separated light rays which are then reflected back to us by the mirrored centre surface of a CD.

Here the diffraction and transmission also take place because diffraction of light rays occurs when it strikes the surface of CD and transmission is obvious when light enters from one medium to another.

The thickness of the different optical media, angle of source light, and brightness of source light all affect which rainbow patterns are visible on a CD.

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set 15 Online Quiz

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1653 heat wave motion sound optics oscillations based general science mcq set 15 question answer pdf
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