set 16 MCQ Questions & Answers Detailed Explanation

MOST IMPORTANT general science mcq - 16 EXERCISES

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

Questions : Assertion (A):
Black hole is such a celestial existence which cannot be seen by telescope.
Reason (R):
The gravitational field of black hole is much strong that even light does not escape from it.
Code

(a) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

(b) (A) is true, but (R) is false

(c) Both (A) and (R) are true and (R) is the correct explanation of (A)

(d) (A) is false, but (R) is true

The correct answers to the above question in:

Answer: (c)

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Read more light heat thermodynamics wave sound optics oscillation Based General Science Questions and Answers

Question : 1

When water is heated from 0ºC to 10ºC, its volume

a) does not change

b) increases

c) decreases

d) first decreases and then increases

Answer: (d)

Question : 2

When a sound wave goes from one medium to another, the quantity that remains unchanged is

a) wavelength

b) frequency

c) amplitude

d) speed

Answer: (b)

Question : 3

The speed of light will be minimum while passing through

a) Water

b) Vacuum

c) Glass

d) Air

Answer: (c)

Question : 4

A star is emitting yellow light. If it is accelerated towards earth then to an observer on earth, it will appear

a) gradually changing to red

b) shinning yellow

c) gradually changing to violet

d) unchanged

Answer: (c)

As the star is accelerated towards earth, its apparent frequency increases, and apparent wavelength decreases.

Therefore, the colour of the light changes gradually to violet.

Question : 5

A person cannot see objects clearly which are nearer than 75 cm from his eyes, the disease he is suffering from is

a) hypermetropia

b) astigmatism

c) myopia

d) presbyopia

Answer: (a)

Question : 6

Human ears can sense sound waves travelling in air having wavelength of

a) 1m

b) 10–3 m

c) 10–2 m

d) 102 m

Answer: (a)

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