GATE (Graduate Aptitude Test in Engineering) Physics (PE): Questions 88 - 92 of 1823

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Question 88

Appeared in Year: 2012

Question MCQ▾

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 , 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 1

b.

– 6J and 2

c.

J and 1

d.

– 3J and 2

Edit

Question 89

Appeared in Year: 2014

Question MCQ▾

The free energy F of a system depends on a thermodynamic variable as with . The value of , when the system is in thermodynamic equilibrium, is – (June)

Choices

Choice (4)Response

a.

b.

Zero

c.

d.

Edit

Question 90

Appeared in Year: 2012

Question MCQ▾

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

The Circuit Consists of a Diode, Resistor and a Battery

The value of in the circuit is – (December)

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 91

Appeared in Year: 2012

Question MCQ▾

Let 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.

b.

p = mv

c.

d.

Edit

Question 92

Appeared in Year: 2014

Question MCQ▾

A system can have three energy levels: . The level is doubly degenerate, while the others are non-degenerate. The average energy at inverse temperature is – (June)

Choices

Choice (4)Response

a.

b.

c.

d.

Edit