set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Consider the following statements:

1. A flute of smaller length produces waves of lower frequency.
2. Sound travels in rocks in the form of longitudinal elastic waves only.

a) 1 and 2 both

b) 1 only

c) 2 only

d) None

Question : 2

Consider the following statements.
Assertion (A):
Space based solar power (SBSP), it is suggested be made a national goal.
Reason (R):
Supply of SBSP is 99% uninterrupted throughout the year, besides the enormity of energy availability.
Select the correct answer using the codes given below.
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 : 3

The bulb of one thermometer is spherical, while that of other is cylindrical. If both of them have equal amount of mercury, which thermometer will respond quickly to the temperature?

a) elliptical bulb

b) spherical bulb

c) cylindrical bulb

d) both (a) and (c)

Question : 4

The earth radiates in the infra-red region of the spectrum. The spectrum is correctly given by

a) Planck’s law of radiation

b) Wien’s law

c) Rayleigh's law

d) Stefan’s law of radiation

Question : 5

In which of the following option sound may not be across travel?

a) Vacuum

b) Iron

c) Water

d) Air

Question : 6

The fastest mode of transfer of heat is

a) radiation

b) conduction

c) convection

d) None of these