ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

MCQ's Test For Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics

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Question # 1

Electrons are

Question # 2

Radioactivity is

Question # 3

In radio-active decay, the original element which disintegrate to another element is called

Question # 4

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

Question # 5

Radioactivity was discovered by:

Question # 6

Nuclei that have the same charge number but different mass number are called

Question # 7

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

Question # 8

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

Question # 9

In wilson cloud chamber, the air becomes saturated with:

Question # 10

The isotope/s of hydrogen is /are:

Question # 11

Neon gas have three isotopes whose atomic numbers are

Question # 12

1 amu is equal to

Question # 13

Which of the following material has smaller has life

Question # 14

Gamma rays consist of steam of

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 Gamma rays consist of steam of
A. electron
B. proton
C. photons
D. all of these
2 The emission of radiations take place in elements, having charge number greater than
A. 109
B. 82
C. 69
D. 52
3 Neutrons are
A. positive charge
B. negatively charged
C. massless
D. neutral
4 Radioactivity is
A. self disruptive activity
B. spontaneous activity
C. exhibited by all elements under proper conditions
D. both 'a' and 'b'
5 A curie represents a very strong source of
A. α-particle
B. β-particle
C. γ-particle
D. none of these
6 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
7 The rate of decay of a radioactive substance
A. decrease exponentially with time
B. decreases linearly with time
C. increases linearly with time
D. increases exponentially with time
8 If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by
A. -4
B. 4
C. 2
D. 1
9 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
10 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life

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