set 15 MCQ Questions & Answers Detailed Explanation

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The following question based on light, heat, thermodynamics, wave motion, sound, optics & oscillations topic of general science mcq

Questions : 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

The correct answers to the above question in:

Answer: (d)

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Question : 1

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)

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 : 2

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

a) Wavelength

b) Mass

c) Velocity

d) Energy

Answer: (d)

Question : 3

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

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 : 4

Retina of the eye is comparable to which of the following parts of a traditional camera?

a) Shutter

b) Lens

c) Film

d) Cover

Answer: (c)

Question : 5

Three colours are the primary colours. These are

a) Yellow, Green and Red

b) Blue, Green and Red

c) Blue, Yellow and Red

d) Blue, Yellow and Red

Answer: (b)

Question : 6

Blue colour of the sky is due to

a) Interference of light

b) Dispersion of light

c) Scattering of light

d) Emission of more blue light as compared to other colours by the Sun

Answer: (c)

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