CSIR Physical Sciences: Questions 131 - 133 of 401

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Question number: 131

» Electronics and Experimental Methods » Semiconductor Devices » Junctions

Appeared in Year: 2014

MCQ▾

Question

A junction is made between a metal of work function WM and a doped semiconductor of work function WS with WM>WS . If the electric field at the interface has to be increased by a factor of 3, then the dopant concentration in the semiconductor would have to be – (December)

Choices

Choice (4) Response

a.

Decreased by a factor of 3

b.

Decreased by a factor of 3

c.

Increased by a factor of 3

d.

Increased by a factor of 9

Question number: 132

» Thermodynamic and Statistical Physics » Free Energy

Appeared in Year: 2012

MCQ▾

Question

The free energy of gas of N particles in a volume V and at a temperature T is F=NkBTln[a0V(kBT)52N], where a0 is a constant and kB denotes the Boltzmann constant. The internal energy of the gas is – (June)

Choices

Choice (4) Response

a.

32NkBT

b.

NkBTln[a0V(kBT)52]

c.

52NkBT

d.

NkBTln[a0V(kBT)52N]32NkBT

Question number: 133

» Classical Mechanics » Special Theory of Relativity » Relativistic Kinematics

Appeared in Year: 2011

MCQ▾

Question

A double pendulum consists of two point masses m attached by massless strings of length l as shown in the figure. The kinetic energy of the pendulum is –

 A double pendulum of two masses m

a Double Pendulum of Two Masses M

Figure shows a double pendulum consists of two point masses m attached by massless strings of length l.

(December)

Choices

Choice (4) Response

a.

12ml2[θ˙12+θ˙22+2θ˙1θ2˙cos(θ1θ2)]

b.

12ml2[θ˙12+2θ˙22+2θ˙1θ2˙cos(θ1θ2)]

c.

12ml2[2θ˙12+θ˙22+2θ˙1θ2˙cos(θ1θ2)]

d.

12ml2[θ˙12+θ˙22]

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