set 11 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 : Which one of the following statements is not true about cosmic rays?

(a) They are made of highly energetic charged particles

(b) They have very short wavelength

(c) They are electromagnetic waves

(d) They originate from the Sun

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

The change of focal length of an eye lense is caused by action of the

a) Ciliary muscles

b) Retina

c) Pupil

d) Iris

Answer: (d)

Question : 2

For shaving, one uses

a) Convex mirror

b) Plain mirror

c) Concave mirror

d) None of the above

Answer: (c)

Question : 3

The gas used in discharge tubes for optical decoration and advertising is

a) Sulphur dioxide

b) Ammonia

c) Carbon dioxide

d) Neon

Answer: (d)

Question : 4

Human eye is most sensitive to visible light of the wavelength

a) 4500 Å

b) 5500 Å

c) 6050 Å

d) 7500 Å

Answer: (b)

Question : 5

To keep drinks at the same temperature for quite sometime, the walls of thermos bottle are coated with

a) Lead Powder

b) Silver Layer

c) Aluminium Paint

d) Mercury Layer

Answer: (b)

Question : 6

‘The stars seem to be higher on the sky than they actually are’. This can be explained by

a) total internal reflection

b) atmospheric refraction

c) dispersion of light

d) diffraction of light

Answer: (b)

Due to atmospheric refraction the twinkling of star, and their position appear higher than the normal.

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