CSIR Physical Sciences: Questions 102 - 105 of 389

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Question number: 102

» Quantum Mechanics » Spin-Statistics Connection

Appeared in Year: 2012

MCQ▾

Question

Consider a system of three spins S1, S2 and S3 each of which can take values + 1 and –1. The energy of the system is given by E=J[S1S2+S2S3+S3S1] , where J is a positive constant. The minimum energy and the corresponding number of spin configurations are, respectively – (December)

Choices

Choice (4) Response
a.

–3J and 2

b.

– 3J and 1

c.

J and 1

d.

– 6J and 2

Question number: 103

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2014

MCQ▾

Question

The free energy F of a system depends on a thermodynamic variable ψ as F=aψ2+bψ6 with a,b>0 . The value of ψ , when the system is in thermodynamic equilibrium, is – (June)

Choices

Choice (4) Response
a.

±(a6b)14

b.

±(a3b)14

c.

±(ab)14

d.

Zero

Question number: 104

» Electronics and Experimental Methods » Semiconductor Devices » Diodes

Appeared in Year: 2012

MCQ▾

Question

A diode D as shown in the circuit has an I – V relation that can be approximated by –

iD={

The circuit consists of a diode, resistor and a battery

The Circuit Consists of a Diode, Resistor and a Battery

In figure a diode D, resistor of 1 (ohm) and a battery of 10 V are connected.

The value of VD in the circuit is – (December)

Choices

Choice (4) Response
a.

8V

b.

5V

c.

(1+11)V

d.

2V

Question number: 105

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

Appeared in Year: 2012

MCQ▾

Question

Let v,pandE denote the speed, the magnitude of momentum, and the energy of a free particle of rest mass m. Then – (December)

Choices

Choice (4) Response
a.

dEdp=constant

b.

v=cpp2+m2c2

c.

p = mv

d.

E=mc2

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