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

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

Question # 2

Rutherford performed an experiment on nuclear reactions in:

Question # 3

Radioactivity was discovered by

Question # 4

Mass of neutron is

Question # 5

The number if neutrons in the nucleus of 92U235are

Question # 6

Mass of proton is

Question # 7

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

Question # 8

The half life of uranium-238 is

Question # 9

The half lie of radium-226 is

Question # 10

How many isotopes of helium are present?

Question # 11

In wilson cloud chamber, the air becomes saturated with:

Question # 12

An alpha particle has a charge of

Question # 13

Nucleus of a hydrogen atom may contain:

Question # 14

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

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 1 amu is equal to
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-34kg
D. 1.66 x 10-27kg
2 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
3 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
4 The figure 1.007276μ shows the mass of an:
A. Atom
B. Positron
C. Electron
D. Neutron
5 For Protium, the mass defect is:
A. Infinite
B. Zero
C. Very large
D. A few grams
6 Nuclei that have the same charge number but different mass number are called
A. isotones
B. isomers
C. isotopes
D. isobars
7 After alpha decay the atomic number of the atom
A. increase by four
B. decreases by two
C. increases by two
D. decrease by four
8 The chemical behaviour of an atom is determined by
A. binding energy
B. atomic number
C. mass number
D. number of isotopes
9 The isotope/s of hydrogen is /are:
A. Protium
B. Deuterium
C. Tritium
D. Both (A) and (B)
10 The nuclei of an element having the same charge number but different mass numbers are called:
A. Isobars
B. Isotopes
C. Isomers
D. Isobaric

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