ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 21 Nuclear Physics

Try The MCQ's Test For ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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Question # 1

When certain nucleus emits anα particle, its mass number:

Question # 2

Radiation detector are used to

Question # 3

A pair of quark and antiquark makes a:

Question # 4

Neutron was discovered by

Question # 5

In 1932 Chadwick discovered

Question # 6

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

Question # 7

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

Question # 8

Mass of neutron is

Question # 9

When a nucleus emits an alpha particle, it atomic mass decreased by

Question # 10

After alpha decay the atomic number of the atom

Question # 11

The unit of decay constant is:

Question # 12

Different radioactive material have

Question # 13

The missing mass which is converted to energy in the formation of nucleus, is called

Question # 14

Neon gas have three isotopes whose atomic numbers are

Question # 15

In radioactive decay, the new element which is formed due to the disintegration of original element is called

Question # 16

Neutron was discovered in

Question # 17

The nucleus/nuclei of hydrogen is/are:

Question # 18

A curie represents a very strong source of

Question # 19

The energy acquired by a mass of 1g moving with the speed of light is

Question # 20

A particle having the mass of electron and charge of a proton is called a

Question # 21

An alpha particle has a charge of

Question # 22

The diameter of an atom is of the order

Question # 23

The emission of radiations take place in elements, having charge number greater than

Question # 24

1 amu is equal to.

Question # 25

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

Question # 26

When a charged particle passes through matter, it produces ionization, this effect is used in

Question # 27

The total charge of any nucleus is given as

Question # 28

The range ofβ-particle in air is greater than that ofα-particle by

Question # 29

1 amu is equal to

Question # 30

Marie curie and Pierre curie discovered:

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Sr.# Question Answer
1 The reciprocal of decay constant λ of a radioactive material is:
A. Frequency
B. Half life
C. Year
D. Mean life
2 The counter, which also provides the power to the G.M. tube is called:
A. Thin mica window
B. thin glass window
C. Airy window
D. Wooden window
3 Radioactivity was discovered by:
A. Becquerel
B. Marie curie
C. Pierre curie
D. All of them
4 Which of the following material has smaller has life
A. uranium
B. polonium
C. radium
D. radian
5 Which are not the elementary particles?
A. Photons
B. Leptons
C. Hadrons
D. Quarks
6 The total charge of any nucleus is given as
A. Ze2
B. Z2e
C. Z/e
D. Ze
7 The half lie of radium-226 is
A. 238 years
B. 4.5 x 109days
C. 1620 years
D. 332 years
8 Neutron was disvovered by:
A. Rutherford in 1920
B. Chadwick in 1922
C. Bohr in 1913
D. Compton in 1927
9 The penetration power ofβ-particle is
A. zero
B. less thanα-particle
C. equal toα-particle
D. greater thanα-particle
10 γ-rays behave like a particle because they explain the
A. Compton effect
B. Photoelectric effect
C. Pair-production
D. all the above
11 Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:
A. 50
B. 100
C. 150
D. 200
12 The most abundant isotope of neon is
A. neon-20
B. neon-21
C. neon-22
D. neon-23
13 The unit of decay constant is:
A. Second
B. Metre
C. Hour
D. Year
14 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
15 The diameter of an atom is of the order
A. 10-125m
B. 10-11m
C. 10-10m
D. 10-9m
16 For an atom having atomic number Z and atomic weight A, the charge on the nucleus is
A. A - Z
B. A + Z
C. Z
D. A
17 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
18 The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called
A. nuclear fission
B. nuclear fusion
C. man defect
D. radioactivity
19 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay
20 In 1932 Chadwick discovered
A. proton
B. neutron
C. photon
D. electron
21 Structure of the nucleus was explained by
A. J.J Thomson
B. Bohr
C. Millikan
D. Rutherford
22 Binding energy per nucleus is
A. greater for heavy nucleus
B. least for heavy nucleus
C. greatest for light nuclei
D. decreases for medium weight niclei
23 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
24 Which of the following material has longer half life
A. radium
B. polonium
C. radium
D. uranium
25 The nucleus/nuclei of hydrogen is/are:
A. Proton
B. Deuteron
C. Triton
D. All of these
26 Examples of moderators used in a fission reactor is/are:
A. Water
B. Heavy water
C. Carbon
D. Hydrocarbon
27 Charge on proton is
A. 1.59 x 10-9C
B. 1.59 x 10-7C
C. -1.59 x 10-19 C
D. 1.59 x 10-19C
28 The isotope/s of hydrogen is /are:
A. Protium
B. Deuterium
C. Tritium
D. Both (A) and (B)
29 During the nuclear changes, the law/s of conservation that hold/s are that of:
A. Charge
B. energy
C. Momentum
D. Mass
30 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these

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