GATE Physics: Questions 125 - 128 of 622

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Question number: 125

» Electronics » Network Analysis

Appeared in Year: 2012

MCQ▾

Question

In the following circuit, the voltage drop across the ideal diode in forward bias condition is 0.7V .

Circuit diagram of three resistors and a diode

Circuit Diagram of Three Resistors and a Diode

In figure a circuit diagram consists of three resistors and a diode, is shown.

The current passing through the diode is –

Choices

Choice (4) Response

a.

1.0mA

b.

1.5mA

c.

2.0mA

d.

0.5mA

Question number: 126

» Thermodynamics and Statistical Physics » Partition Function

Appeared in Year: 2012

MCQ▾

Question

Consider a system whose three energy levels are given by 0,εand2ε . The energy level ε is two – fold degenerate and the other two are non – degenerate. The partition function of the system with β=1KBT is given by –

Choices

Choice (4) Response

a.

(1+eβε)2

b.

1+2eβε

c.

1+eβε+e2βε

d.

2eβε+e2βε

Question number: 127

» Thermodynamics and Statistical Physics » Degenerate Fermi Gas

Appeared in Year: 2012

MCQ▾

Question

For an ideal Fermi gas in three dimensions, the electron velocity VF at the Fermi surface is related to electron concentration n as,

Choices

Choice (4) Response

a.

VFn

b.

VFn12

c.

VFn13

d.

VFn23

Question number: 128

» Thermodynamics and Statistical Physics » Partition Function

Appeared in Year: 2012

MCQ▾

Question

A paramagnetic system consisting of N spin – half particles, is placed in an external magnetic field. It is found that N2 spins are aligned parallel and the remaining N2 spins aligned antiparallel to the magnetic field. The statistic entropy of the system is –

Choices

Choice (4) Response

a.

N2kBln2

b.

NkBln2

c.

3N2kBln2

d.

2NkBln2

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