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	In his experiment on nuclear reactions, Rutherford bombardedα particles on:	A. Nitrogen B. Hydrogen C. Lead D. Oxygen
3	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
4	Nuclei that have the same charge number but different mass number are called	A. isotones B. isomers C. isotopes D. isobars
5	In radio-active decay, the original element which disintegrate to another element is called	A. element B. daughter element C. parent element D. none of these
6	If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be	A. Equal to 1 B. Less than 1 C. Greater than 1 D. Infinity
7	The half life of radioactive substances depends upon	A. amount of substance B. energy of substance C. state of substance D. temperature of substance
8	Neutron was discovered by	A. Curie B. Roentgen C. Chadwick D. Rutherford
9	Radiation detector are used to	A. measure intensity of radiation B. measure energy of radiation C. difference between different types of radiation D. all the above
10	Radioactivity	A. is exhibited more by semiconductors in general B. in exhibited more by the element when they are coupled C. with other radioactive elements by a covalent bond D. is an atomic property of radioactive elements

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

Neutrons are

An alpha particle has a charge of

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

A curie represents a very strong source of

When a nucleus emits an alpha particle, it atomic mass decreased by

Neutron was discovered in

The isotope/s of hydrogen is /are:

How much time, theα-particle more massive than an electron

Neon gas have three isotopes whose atomic numbers are

Mass of neutron is

Alfa particles are

The nuclei of an element having the same charge number but different mass numbers are called:

Which of the following material has smaller has life

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

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

The total charge of any nucleus is given as

The diameter of an atom is of the order

Phenomenon of radioactivity is due to disintegration of

Electrons are

Fraction of the decaying atoms per unit time is called

β-particles are easily deflected by collisions than heavy

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

After alpha decay the atomic number of the atom

Charge on proton is

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

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

The rate of decay of a radioactive substance

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

Gamma rays consist of steam of

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ECAT Physics Chapter 21 Important MCQ's

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