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

Radioactivity is

Question # 2

When certain nucleus emits aβ-particles, is mass number:

Question # 3

The number of protons inside a nucleus is called

Question # 4

Neutron was discovered in

Question # 5

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

Question # 6

Pair production take place when energy ofγ-rays photon is

Question # 7

The rate of decay of radioactive substance

Question # 8

The reciprocal of decay constant λ of a radioactive material is:

Question # 9

A mass spectrograph sort out

Question # 10

Gamma rays consist of steam of

Question # 11

Radioactivity was discovered by:

Question # 12

The amount of energy equivalent to 1 a.m.u is

Question # 13

The rate of decay of a radioactive substance

Question # 14

The isotope/s of hydrogen is /are:

Question # 15

Mass of proton is of order of

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Nucleus of a hydrogen atom may contain:
A. One neutron only
B. Two protons and one neutron
C. Two protons and two neutrons
D. Aany of above
2 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these
3 If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be
A. Equal to 1
B. Less than 1
C. Greater than 1
D. Infinity
4 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
5 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick
6 Neutron was disvovered by:
A. Rutherford in 1920
B. Chadwick in 1922
C. Bohr in 1913
D. Compton in 1927
7 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric
8 When a charged particle passes through matter, it produces ionization, this effect is used in
A. fission reaction
B. reactor
C. radiation detector
D. fusion reaction
9 The distance travelled byα-particle in a medium before coming to rest, is called
A. range ofγ-particle
B. range of neutrons
C. range of particle
D. none of these
10 When a nucleus emits an alpha particle, it atomic mass decreased by
A. 2
B. 1
C. 4
D. 3

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