GATE PH Nuclear and Particle Physics PYQs & Answers — Page 3

Questions 21–30 of 61. Imported answers require independent review unless marked reviewed.

The deuteron is a bound state of a neutron and a proton. Which of the following statements is(are) CORRECT?

Your answerSelect all correct options. You can choose more than one.

The deuteron has a finite value of electric quadrupole moment due to non-spherical electronic charge distribution

The magnetic moment of the deuteron is equal to the sum of the magnetic moments of the neutron and the proton

The deuteron state is an admixture of

and

states

The deuteron state is an admixture of

and

states

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The Geiger-Muler counter is a device to detect

and

radiations. It is a cylindrical tube filled with monatomic gases like argon, and polyatomic gases such as ethyl alcohol. The inner electrode is along the axis of the cylindrical tube and the outer electrode is the tube. Which of the following statements is(are) CORRECT?

Your answerSelect all correct options. You can choose more than one.

Argon is used so that ambient light coming from the surroundings do not produce any signal in the detector

Ethyl alcohol is used as a quenching gas

The electric field strength decreases from the axis to the edge of the tube and the direction of the field is radially outward

The electric field increases from the axis to the edge of the tube and the field direction is radially inward

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Which one of the following options is the most appropriate match between the items given in Column 1 and Column 2?

Column 1	Column 2
(i) Visible light	P. Transition between core energy levels of atoms
(ii) X-rays	Q. Transition between nuclear energy levels
(iii) Gamma rays	R. Pair production
(iv) Thermal neutrons	S. Crystal structure determination
	T. Photoelectric effect

Your answerChoose one option.

(i) - T; (ii) - P,S,T; (iii) - Q,R; (iv) - S

(i) - P,T; (ii) - S; (iii) - R,S; (iv) - S,T

(i) - T; (ii) - R,S; (iii) - Q,R; (iv) - S

(i) - S,T; (ii) - P,S; (iii) - R,T; (iv) - S

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In a hadronic interaction,

s are produced with different momenta, and they immediately decay into two photons with an opening angle

between them. Assuming that all these decays occur in one plane, which one of the following figures depicts the behavior of

as a function of the

momentum

Your answerChoose one option.

Diagram for Physics question 48 (figure 2)

Diagram for Physics question 48 (figure 3)

Diagram for Physics question 48 (figure 4)

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Under parity and time reversal transformations, which of the following statements is(are) TRUE about the electric dipole moment

and the magnetic dipole moment

Your answerSelect all correct options. You can choose more than one.

is odd under parity and

is odd under time reversal

is odd under parity and

is even under time reversal

is even under parity and

is odd under time reversal

is even under parity and

is even under time reversal

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A slow moving

particle is captured by a deuteron

and this reaction produces two neutrons

in the final state, i.e.,

. Neutron and deuteron have even intrinsic parities, whereas

has odd intrinsic parity.

and

are the orbital and spin angular momenta, respectively, of the system of two neutrons. Which of the following statements regarding the final two-neutron state is(are) CORRECT?

Your answerSelect all correct options. You can choose more than one.

It has odd parity

is odd

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In pion nucleon scattering, the pion and nucleon can combine to form a short lived bound state called the

particle

. The masses of the pion, nucleon and the

particle are 140 MeV/

, 938 MeV/

and 1230 MeV/

, respectively. In the lab frame, where the nucleon is at rest, what is the minimum energy (in MeV/

, rounded off to one decimal place) of the pion to produce the

particle?

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-particle is emitted from the decay of Americium (Am) at rest, i.e.,

. The rest masses of

and

are 224.544 GeV/

, 220.811 GeV/

and 3.728 GeV/

respectively. What is the kinetic energy (in MeV/

, rounded off to two decimal places) of the

-particle?

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Match the order of

-decays given in the left column to appropriate clause in the right column. Here

and

are nuclei with intrinsic spin

and parity

. 1.

; 2.

; 3.

; 4.

. i) First forbidden

-decay; ii) Second forbidden

-decay; iii) Third forbidden

-decay; iv) Allowed

-decay.

Your answerChoose one option.

1 – i, 2 – ii, 3 – iii, 4 – iv

1 – iv, 2 – i, 3 – ii, 4 – iii

1 – i, 2 – iii, 3 – i, 4 – iv

1 – iv, 2 – ii, 3 – iii, 4 – i

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If nucleons in a nucleus are considered to be confined in a three-dimensional cubic box, then the first four magic numbers are

Your answerChoose one option.

2, 8, 20, 28

2, 8, 16, 24

2, 8, 14, 20

2, 10, 16, 28

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GATE PH Nuclear and Particle Physics PYQs

Question 29

Question 30

Question 39

Question 48

Question 55

Question 58

Question 60

Question 62

Question 12

Question 18