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	The rate of decay of radioactive substance	A. is constant B. decrease exponentially with time C. varies inversely as time D. decreases linearly with time
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	According to Rutherford atomic model, the positive charge in an atom	A. is concentrated at its centre B. is in the form of positive electron at same distance from its centre C. is spread uniformly through its volume D. none of these
4	The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called	A. nuclear fission B. nuclear fusion C. man defect D. radioactivity
5	The reciprocal of decay constant λ of a radioactive material is:	A. Frequency B. Half life C. Year D. Mean life
6	The nucleus left after the emission of some radiation is called:	A. Parent nucleus B. Daughter necleus C. Mother necleus D. Any of these
7	Alfa particles are	A. hydrogen nuclei B. helium nuclei C. electrons D. photons
8	Mass of proton is of order of	A. 10^-31gm B. 10^-27kg C. 10^-24gm D. 10⁺²⁷kg
9	The total charge of any nucleus is given as	A. Ze² B. Z²e C. Z/e D. Ze
10	The number of all the protons and neutrons in a nucleus is known as	A. atomic number B. mass number C. charge number D. none of these

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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

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

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

1 amu is equal to

Fraction of the decaying atoms per unit time is called

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

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

The half life of radioactive substances depends upon

γ-rays behave like a particle because they explain the

The amount of energy equivalent to 1 a.m.u is

The penetration power ofβ-particle is

Mass of neutron is

A particle having the mass of electron and charge of a proton is called a

The range of particle depends upon the factor

Charge on neutron is

Neutron was discovered by

Radioactivity was discovered by

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

When certain nucleus emits anα particle, its mass number:

Which of the following material has smaller has life

According to Rutherford atomic model, the positive charge in an atom

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

Referring to the above figure, we can say that of all the elements, the most stable element is

The counter, which also provides the power to the G.M. tube is called:

Which of these is not a radiation detector

Radioactivity

Rutherford performed an experiment on nuclear reactions in:

The half lie of radium-226 is

The emission of radiations take place in elements, having charge number greater than

The total charge of any nucleus is given as

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

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ECAT Physics Chapter 21 Important MCQ's

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