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) amplitude modulated
(b) both frequency and amplitude modulated
(c) frequency modulated
(d) phase modulated
The correct answers to the above question in:
Answer: (b)
Discuss Form
Read more physics ncert Based General Science Questions and Answers
Question : 1
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 : 2
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.
Question : 3
The number of atoms per unit cell in a sc, bcc and fcc system are:
a) 8, 6 and 10 respectively
b) 1, 4 and 2 respectively
c) 1, 2 and 4 respectively
d) 2, 4 and 1 respectively
Answer »Answer: (c)
Number of atoms per unit cell,
$n = {N_c}/8 + {N_f}/2 + {N_i}/1$
For scc system, $N_c = 8, N_f = 0$ and
$N_i = 2$, so n = 2
For f.c.c. system, $N_c = 8, N_f = 0$ and
$N_i = 4$, so n = 4
Question : 4
Which of the following does NOT allow harmful ultraviolet radiations from the sun to reach the earth?
a) NO2
b) CO2
c) O2
d) O3
Answer »Answer: (d)
Verbal Reasoning
Question & Answer Quiz
Non Verbal Reasoning
Question & Answer Quiz
Quantitative Aptitude
Question & Answer Quiz
Computer MCQ
Question & Answer Quiz
General English
Question & Answer Quiz
History GK
Question & Answer Quiz
Polity GK
Question & Answer Quiz
Geography GK
Question & Answer Quiz
Economy GK
Question & Answer Quiz
General Awareness GK
Question & Answer Quiz
Recently Added Subject & Categories For All Competitive Exams
New 100+ Compound Interest MCQ with Answers PDF for IBPS
Compound Interest verbal ability questions and answers solutions with PDF for IBPS RRB PO. Aptitude Objective MCQ Practice Exercises all competitive exams
Continue Reading »
100+ Mixture and Alligation MCQ Questions PDF for IBPS
Most importantly Mixture and Alligation multiple choice questions and answers with PDF for IBPS RRB PO. Aptitude MCQ Practice Exercises all Bank Exams
Continue Reading »
IBPS Profit and Loss Questions Solved Problems with PDF
Most important Profit and Loss multiple choice questions and answers with PDF for IBPS RRB PO. 100+ Aptitude MCQ Practice Exercises all competitive exams
Continue Reading »
100+ Average Aptitude Questions Answers solutions MCQ PDF
New Average multiple choice questions and answers with PDF for IBPS RRB PO. 100+ Quantitative Aptitude MCQ Practice Exercises all competitive exams
Continue Reading »