set 3 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) NO2
(b) CO2
(c) O2
(d) O3
The correct answers to the above question in:
Answer: (d)
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Read more physics ncert Based General Science Questions and Answers
Question : 1
Television signals are
a) amplitude modulated
b) both frequency and amplitude modulated
c) frequency modulated
d) phase modulated
Answer »Answer: (b)
Question : 2
If an a-particle is projected normally through a uniform magnetic field, then the path of the a-particle inside the field will be
a) parabolic
b) elliptical
c) circular
d) a straight line
Answer »Answer: (c)
Question : 3
Consider the following statements: In a nuclear reactor, self-sustained chain reaction is possible, because:
- More neutrons are released in each of the fission reactions.
- The neutrons immediately take part in the fission process.
- The fast neutrons are slowed down by graphite.
- Every neutron released in the fission reaction initiates further fission.
a) 1 and 3
b) 2 and 4
c) 1, 2 and 3
d) 2, 3 and 4
Answer »Answer: (c)
A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. The most common use of nuclear reactors is for the generation of electrical power and for the power in some ships.
In every fission reaction in which uranium nuclei splits up to give smaller nuclei three more neutrons are produced which further results into splitting of heavy uranium nuclei and more number of neutrons will be produced.
Thus, statement, 1 & 2 are correct.
In nuclear reactor all the neutrons produced can not take part in fission reaction, else reaction can turn out extremely violent. Thus, graphite rods are used as a control rods to slow down the speed of fast moving neutrons. Thus, statement 3 is also correct.
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