ECAT Pre General Science Chapter 21 online mcq test with answers for Physics chapter 21 (Nuclear Physics)

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ECAT Physics Chapter 21 Important MCQ's

Sr.#	Question	Answer
1	Fraction of the decaying atoms per unit time is called	A. decay atom B. decay element C. decay constant D. decay
2	For an atom having atomic number Z and atomic weight A, the number of electron in an atoms	A. A - Z B. A + Z C. Z D. A
3	The number if neutrons in the nucleus of ₉₂U²³⁵are	A. Infinite B. 92 C. 235 D. 143
4	Neutron was discovered by	A. Curie B. Roentgen C. Chadwick D. Rutherford
5	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
6	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
7	A mass spectrograph sort out	A. molecules B. atoms C. elements D. isotopes
8	Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called	A. deuteron B. deterium C. protium D. tritium
9	Alfa particles are	A. hydrogen nuclei B. helium nuclei C. electrons D. photons
10	Which of the following material has smaller has life	A. uranium B. polonium C. radium D. radian

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ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

MCQ's Test For ECAT Pre General Science Physics Chapter 21 Nuclear Physics

ECAT Pre General Science Physics Chapter 21 Nuclear Physics

The number of protons inside a nucleus is called

The time required for a radioactive material to decrease in active by one half is called

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

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

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

The total charge of any nucleus is given as

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

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

The isotope/s of hydrogen is /are:

The nucleus/nuclei of hydrogen is/are:

Neutron was suggested to be in the nucleus by:

Mass of neutron is

The chemical properties of an element depends upon the number of

Radiation detector are used to

The number if neutrons in the nucleus of 92U235are

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

A mass difference of 0.0012 u is equivalent to and energy of:

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

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

Neutron was disvovered by:

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

The most abundant isotope of neon is

A pair of quark and antiquark makes a:

The unit of decay constant is

Charge on neutron is

Alfa , beta and gamma rays are emitted from a radio-active substance

Radioactivity was discovered by

Curie is a unit of

The half lie of radium-226 is

When certain nucleus emits anα particle, its mass number:

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ECAT Physics Chapter 21 Important MCQ's

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The number if neutrons in the nucleus of ₉₂U²³⁵are