ECAT Pre Computer Science Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Physics Chapter 21 Nuclear Physics

Try The 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

Nucleus consists of

Question # 2

Structure of the nucleus was explained by

Question # 3

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

Question # 4

The number if neutrons in the nucleus of 92U235are

Question # 5

The chemical properties of all the isotopes of an elements are

Question # 6

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

Question # 7

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

Question # 8

The rate of decay of radioactive substance

Question # 9

When certain nucleus emits anα particle, its mass number:

Question # 10

Radium was discovered by:

Question # 11

Electrons are

Question # 12

Which of these is not a radiation detector

Question # 13

Charge on proton is

Question # 14

Mass of neutron is

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The range ofβ-particle in air is greater than that ofα-particle by
A. 1000 times
B. 100 times
C. 15 times
D. 10 times
2 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
3 The energy is found from Einstein's mass energy relation is called
A. binding energy of electron
B. binding energy of proton
C. binding energy of neutron
D. binding energy of nucleus
4 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
5 Pair production take place when energy ofγ-rays photon is
A. equal to 1.02 Mev-
B. greater than 1.02 Mev
C. less than 1.02 Mev
D. none of these
6 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these
7 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
8 When a nucleus emits an alpha particle, it atomic mass decreased by
A. 2
B. 1
C. 4
D. 3
9 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
10 According to Rutherford atomic model, the positive charge in an atom
A. is concentrated at its centre
B. is in the form of positive electron at same distance from its centre
C. is spread uniformly through its volume
D. none of these

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