set 2 MCQ Questions & Answers Detailed Explanation
MOST IMPORTANT general science mcq - 3 EXERCISES
The following question based on modern and space physics, sources of energy topic of general science mcq
(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.
The correct answers to the above question in:
Answer: (d)
Photoelectrons are emitted if the frequency of incident light is greater than the threshold frequency.
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Question : 1
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
Answer »Answer: (a)
Question : 2
Which one among the following radiations carries maximum energy?
a) Gamma-rays
b) X-rays
c) Ultraviolet rays
d) Infra-red rays
Answer »Answer: (a)
Question : 3
Repeaters used in telephone links are:
a) Oscillators
b) Amplifiers
c) Rectifiers
d) Transformers
Answer »Answer: (b)
Question : 4
The most familiar form of radiant energy in sunlight that causes tanning and sunburning of human skin, is called
a) visible radiation
b) infrared radiation
c) ultraviolet radiation
d) microwave radiation
Answer »Answer: (c)
Question : 5
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
Answer »Answer: (a)
Question : 6
Match List-I with List-II and select the correct answer using the code given below the lists.
List I | List II |
A. Photons | 1. The minimum energy for emission of electron |
B. Nucleons | 2. Heavy water |
C. Work function | 3. Packet of energy |
D. Coolant | 4. Neutrons and Protons |
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
Answer »Answer: (c)
A → 3; B → 4; C → 1; D → 2
- Photon is a packet of energy emitted from a source of radiations.
- Nucleons are consist of neutrons and protons.
- The minimum energy required to liberate the electrons from the metal surface, is called work function.
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