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

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

Question # 2

A mass difference of 0.0012 u is equivalent to and energy of:

Question # 3

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

Question # 4

Alfa particles are

Question # 5

The nucleus left after the emission of some radiation is called:

Question # 6

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

Question # 7

How many isotopes of helium are present?

Question # 8

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

Question # 9

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

Question # 10

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

Question # 11

The number of isotopes of hydrogen are

Question # 12

When a nucleus emits an alpha particles, its charge number decreases by

Question # 13

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

Question # 14

The distance travelled byα-particle in a medium before coming to rest, is called

Question # 15

There is present in paraffin a large amount of:

Question # 16

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

Question # 17

In 1932 Chadwick discovered

Question # 18

Fraction of the decaying atoms per unit time is called

Question # 19

Charge on proton is

Question # 20

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

Question # 21

Radioactivity was discovered by

Question # 22

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

Question # 23

Which of these is not a radiation detector

Question # 24

The figure 1.007276μ shows the mass of an:

Question # 25

Radium was discovered by:

Question # 26

Phenomenon of radioactivity is due to disintegration of

Question # 27

Different radioactive material have

Question # 28

Neutron was suggested to be in the nucleus by:

Question # 29

The nucleus/nuclei of hydrogen is/are:

Question # 30

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 When radioactive nucleus emits aβ-particle, the proton-neutron ratio
A. decrease
B. increase
C. same
D. none of these
2 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these
3 The number of isotopes of hydrogen are
A. 2
B. 1
C. 3
D. 4
4 Different radioactive material have
A. same half lives
B. different half lives
C. same mean lives
D. same total lives
5 Which are not the elementary particles?
A. Photons
B. Leptons
C. Hadrons
D. Quarks
6 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
7 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
8 Maric Curie and Pieree Curie discovered two new radioactive elements, which are called
A. polonium uranium
B. uranium and radium
C. polonium and radium
D. none of these
9 Radiation detector are used to
A. measure intensity of radiation
B. measure energy of radiation
C. difference between different types of radiation
D. all the above
10 For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is
A. A - Z
B. A
C. Z
D. A + Z

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