ECAT Pre Engineering Physics Chapter 21 MCQ Test With Answer

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

Try The 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

The half life of uranium-238 is

Question # 2

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

Question # 3

A pair of quark and antiquark makes a:

Question # 4

Radioactivity was discovered by:

Question # 5

The number of all the protons and neutrons in a nucleus is known as

Question # 6

After alpha decay the atomic number of the atom

Question # 7

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

Question # 8

Mass of proton is of order of

Question # 9

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

Question # 10

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

Question # 11

The figure 1.007276μ shows the mass of an:

Question # 12

γ-rays behave like a particle because they explain the

Question # 13

The isotope/s of hydrogen is /are:

Question # 14

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

Question # 15

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

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ECAT Physics Chapter 21 Important MCQ's

Sr.# Question Answer
1 The unit of decay constant is:
A. Second
B. Metre
C. Hour
D. Year
2 The counter, which also provides the power to the G.M. tube is called:
A. Thin mica window
B. thin glass window
C. Airy window
D. Wooden window
3 Alfa particles are
A. hydrogen nuclei
B. helium nuclei
C. electrons
D. photons
4 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
5 The unit of decay constant is
A. sex
B. sec2
C. sec-1
D. sec-2
6 Nucleus consists of
A. proton and neutron
B. protons and electron
C. electron and neutron
D. protons only
7 Radioactivity was discovered by
A. Rutherford
B. Henri Becqureal
C. Maxwell
D. James Chadwick
8 Fraction of the decaying atoms per unit time is called
A. decay atom
B. decay element
C. decay constant
D. decay
9 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
10 1 amu is equal to.
A. 1.66 x 10-24kg
B. 1.66 x 10-19kg
C. 1.66 x 10-24kg
D. 1.66 x 10-27kg

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