set 14 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the following atmospheric layers is responsible for the deflection of radio waves?

a) Mesosphere

b) Stratosphere

c) Troposphere

d) Ionosphere

Question : 2

Placement of another identical prism in an inverted position with respect to the first and allowing the colours of spectrum to pass through it will

a) keep the spectrum as before

b) change the spectrum into white light

c) change the spectrum into a black band

d) split into more colours

Question : 3

When light waves pass from air to glass the variable affected are

a) Wavelength and frequency

b) Velocity and frequency

c) Wavelength, frequency and velocity

d) Wavelength and velocity

Question : 4

Assertion (A):
The boiling point of water decreases as the altitude increases.
Reason (R):
The atmospheric pressure increases with altitude.
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

Question : 5

Consider the following statements : If the same note is played on a flute and a sitar, one can still distinguish between them because they differ in

1. frequency
2. intensity
3. quality

a) 3 only

b) 1 only

c) 2 and 3

d) 2 only

Question : 6

If a car is moving towards you with its horn sounding, you hear a higher pitch than you would hear if the car were at rest. This is because:

a) you receive successive crests more frequently even though the wave itself is unchanged

b) the waves travel faster

c) successive crests produced by the horn are closer to each other

d) the motion of the car raises the frequency of the horn