set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

In the photoelectric effect, electrons are emitted:

a) With a maximum velocity proportional to the frequency of the incident radiation.

b) At a rate that is independent of the emitter.

c) At a rate that is proportional to the amplitude of the incident radiation.

d) Only if the frequency of the incident radiations is above a certain threshold value.

Question : 2

Propane is used instead of natural gas on many farms and in rural areas. Why is propane often used instead of natural gas?

a) It’s portable

b) It’s cleaner

c) It’s safer

d) It’s cheaper

Question : 3

Which one among the following radiations carries maximum energy?

a) Gamma-rays

b) X-rays

c) Ultraviolet rays

d) Infra-red rays

Question : 4

Geothermal energy is

a) energy stored as heat in the earth

b) amount of energy obtained from coal and petroleum inside earth crust.

c) energy of magma inside the earth crust

d) amount of minerals obtained from earth crust

Question : 5

Match List-I with List-II and select the correct answer using the code given below the lists.

a) A – 4 ; B – 2 ; C – 3 ; D – 1

b) A – 2 ; B – 1 ; C – 4 ; D – 3

c) A – 3 ; B – 4 ; C – 1 ; D – 2

d) A – 2 ; B – 4 ; C – 1 ; D – 3

Question : 6

Audio signal cannot be transmitted because

a) the signal cannot be amplified for distance communication

b) the transmitting antenna length is very small to design

c) the signal has more noise

d) the transmitting antenna length is very large and impracticable