Question # 1

The part of a transistor which is heavily doped to produce large number of majority carriers is

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Emitter

Base

Collector

Any of the above depending on nature of transistor.

Which of the following is a scalar quantity

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Density

Displacement

Torque

Weight

A p-n junction has a thickness of the order of

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1 cm

1 mm

10^-6 cm

10^-12 cm

When a Na ion and a CI ion are placed in air a force F acts between them when they are separated by a distance of 1 cm from each other the permittivity of air and the dielectric constant of water are ε₀ and K respectively When a piece of salt is placed in water then the force between Na⁺ and CI^- ions separated by a distance of 1 cm will be

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F

FK/ε₀

F/Kε₀

F/K

A photoelectric cell converts

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Electrical energy to light energy

Light energy to light energy

Light energy to electrical energy

Light energy to elastic energy

At 0° K which of the following properties of a gas will be zero?

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Kinetic energy

Potential energy

Vibrational enegy

Density

Which of the following lists of physical quantities consists only of vectors:

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Time,temperature,velocity

Force,volume,momentum

Velocity,acceleration,mass

Force,acceleration,velocity

In a capacitive circuit

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Current leads voltage by phase of π/2

Voltage leads current by phase of π/2

Current and voltage are in same phase

Sometime current and sometime voltage leads

Two forces are acting together on an object. The magnitude of their resultant is minimum when the angle between the force is.

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0°

60°

120°

180°

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