ECAT Pre Computer Science Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 21 Nuclear Physics

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ECAT Physics Chapter 21 Nuclear Physics

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Question # 1

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

Question # 2

Nucleus consists of

Question # 3

Curie is a unit of

Question # 4

According to Rutherford atomic model, the positive charge in an atom

Question # 5

Radioactivity is

Question # 6

Fraction of the decaying atoms per unit time is called

Question # 7

The rate of decay of a radioactive substance

Question # 8

The most abundant isotope of neon is

Question # 9

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

Question # 10

Structure of the nucleus was explained by

Question # 11

β-particles are easily deflected by collisions than heavy

Question # 12

γ-rays are

Question # 13

During the nuclear changes, the law/s of conservation that hold/s are that of:

Question # 14

Mass of proton is of order of

Question # 15

The counter, which also provides the power to the G.M. tube is called:

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Sr.# Question Answer
1 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
2 Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:
A. 50
B. 100
C. 150
D. 200
3 Neon gas have three isotopes whose atomic numbers are
A. 20, 24 , 23
B. 20, 21 , 22
C. 20, 19 , 21
D. none of these
4 The time required for a radioactive material to decrease in active by one half is called
A. half time
B. half life
C. disintegration time
D. mean life
5 The rate of decay of radioactive substance
A. is constant
B. decrease exponentially with time
C. varies inversely as time
D. decreases linearly with time
6 Radioactivity was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. All of them
7 How many isotopes of helium are present?
A. 1
B. 2
C. 3
D. 4
8 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
9 A mass difference of 0.0012 u is equivalent to and energy of:
A. 0.5 Me V
B. 1.13 MeV
C. 5.13 MeV
D. 1.13 keV
10 Neutron was disvovered by:
A. Rutherford in 1920
B. Chadwick in 1922
C. Bohr in 1913
D. Compton in 1927
11 Structure of the nucleus was explained by
A. J.J Thomson
B. Bohr
C. Millikan
D. Rutherford
12 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4
13 Nuclei that have the same charge number but different mass number are called
A. isotones
B. isomers
C. isotopes
D. isobars
14 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
15 Charge on neutron is
A. 1.6 x 10-19C
B. zero
C. -1.6 x 10-19C
D. 1.2 x 10-19C

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