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

Mass of proton is

Question # 2

The unit of decay constant is

Question # 3

The figure 1.007276μ shows the mass of an:

Question # 4

The energy is found from Einstein's mass energy relation is called

Question # 5

Examples of moderators used in a fission reactor is/are:

Question # 6

How many isotopes of helium are present?

Question # 7

U-238 present in the natural uranium is about:

Question # 8

Neutrons are

Question # 9

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

Question # 10

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

Question # 11

Neon gas have three isotopes whose atomic numbers are

Question # 12

After alpha decay the atomic number of the atom

Question # 13

The number of isotopes of hydrogen are

Question # 14

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

Question # 15

Curie is a unit of

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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 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
3 The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains
A. 3 more neutrons
B. 3 more electrons
C. 3 more protons
D. 3 more ions
4 β-particles are easily deflected by collisions than heavy
A. α-particles
B. β-particles
C. γ-particles
D. none of these
5 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
6 Alfa , beta and gamma rays are emitted from a radio-active substance
A. spontaneously
B. when it is heated
C. when it is exposed to light
D. When it interacts with the other particle
7 The number of protons inside a nucleus is called
A. mass number
B. atomic weight
C. atomic number
D. none of these
8 The number if neutrons in the nucleus of 92U235are
A. Infinite
B. 92
C. 235
D. 143
9 Rate of decay is actually described by.
A. Half line
B. Decay constant
C. Mean life
D. Total life
10 Different radioactive material have
A. same half lives
B. different half lives
C. same mean lives
D. same total lives

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