ECAT Pre General Science Physics Chapter 21 MCQ Test With Answer

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

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ECAT Pre General Science Physics Chapter 21 Nuclear Physics

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Question # 1

Radioactivity is

Question # 2

Charge on proton is

Question # 3

The chemical properties of an element depends upon the number of

Question # 4

A pair of quark and antiquark makes a:

Question # 5

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

Question # 6

β-particles are easily deflected by collisions than heavy

Question # 7

The energy is found from Einstein's mass energy relation is called

Question # 8

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

Question # 9

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

Question # 10

Which are not the elementary particles?

Question # 11

U-238 present in the natural uranium is about:

Question # 12

Nucleus consists of

Question # 13

The unit of decay constant is

Question # 14

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

Question # 15

Three quarks make:

Question # 16

The rate of decay of radioactive substance

Question # 17

The number if neutrons in the nucleus of 92U235are

Question # 18

Marie curie and Pierre curie discovered:

Question # 19

Fraction of the decaying atoms per unit time is called

Question # 20

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

Question # 21

Neutron was discovered in

Question # 22

Which of the following material has smaller has life

Question # 23

The number of protons inside a nucleus is called

Question # 24

The chemical behaviour of an atom is determined by

Question # 25

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

Question # 26

Radium was discovered by:

Question # 27

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

Question # 28

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

Question # 29

Radioactivity

Question # 30

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

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Sr. # Question Answer
1 The half life of uranium-238 is

A. 6.2 x 109years

B. 4.5 x 109days

C.4.5 x 109years

D. 1.3 x 106years

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

A. element

B. daughter element

C.parent element

D. none of these

3 The range of particle depends upon the factor

A. charge, mass and energy of particle

B. density of medium

C.ionization potential of the atoms

D. all the above

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

A. Parent nucleus

B. Daughter necleus

C.Mother necleus

D. Any of these

5 The rate of decay of a radioactive substance

A. decrease exponentially with time

B. decreases linearly with time

C.increases linearly with time

D. increases exponentially with time

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 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

8 A curie represents a very strong source of

A. α-particle

B. β-particle

C.γ-particle

D. none of these

9 Binding energy per nucleus is

A. greater for heavy nucleus

B. least for heavy nucleus

C.greatest for light nuclei

D. decreases for medium weight niclei

10 The number of protons inside a nucleus is called

A. mass number

B. atomic weight

C.atomic number

D. none of these

11 Structure of the nucleus was explained by

A. J.J Thomson

B. Bohr

C.Millikan

D. Rutherford

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

A. isotones

B. isomers

C.isotopes

D. isobars

13 Three quarks make:

A. An electron

B. A meson

C.A baryon

D. A photon

14 Which of these is not a radiation detector

A. Wilson cloud chamber

B. cyclotron acceleration

C.Geiger Miller counter

D. solid state detector

15 Mass of neutron is

A. 1.67 x 10-31kg

B. 1.67 x 10-27kg

C.9.1 x 10-31kg

D. 1.67 x 10-19kg

16 Neon gas have three isotopes whose atomic numbers are

A. 20, 24 , 23

B. 20, 21 , 22

C.20, 19 , 21

D. none of these

17 When radioactive nucleus emits aβ-particle, the proton-neutron ratio

A. decrease

B. increase

C.same

D. none of these

18 The chemical properties of an element depends upon the number of

A. electron

B. position

C.photons

D. neutrons

19 The energy is found from Einstein's mass energy relation is called

A. binding energy of electron

B. binding energy of proton

C.binding energy of neutron

D. binding energy of nucleus

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

A. Frequency

B. Half life

C.Year

D. Mean life

21 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

22 Beta particles are

A. hydrogen nuclei

B. helium nuclei

C.electrons

D. photons

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

A. Isobars

B. Isotopes

C.Isomers

D. Isobaric

24 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

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

A. 50

B. 100

C.150

D. 200

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

A. -4

B. 4

C.2

D. 1

27 The half lie of radium-226 is

A. 238 years

B. 4.5 x 109days

C.1620 years

D. 332 years

28 Neutron was discovered in

A. 1915

B. 1920

C.1925

D. 1932

29 The nucleus/nuclei of hydrogen is/are:

A. Proton

B. Deuteron

C.Triton

D. All of these

30 There is present in paraffin a large amount of:

A. Nitrogen

B. Hydrogen

C.Carbon

D. Baryllium

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