Question # 1

Shunt required in an ammeter of resistance R to decrease its deflection from 30 ampere to 10 ampere is

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R/4

R/3

R/2

R

Radio waves of constant amplitude can be generated with

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Rectifier

Filter

FET

oscillator

A piece of fuse wire melts when a current of 15 ampere flows through it.

With this current, if it dissipates 22.5 W, the resistance of fuse wire will be

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Zero

10 ohm

1 ohm

0.10 ohm

The magnetic moment of a circular coil carrying current is

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Directly proportional to the length of the wire in the coil

Inversely proportional to the length of the wire in the coil

Directly proportional to the square of the length of the wire in the coil

Inversely proportional to the square of the length of the wire in the coil

The incorrect statement regarding the lines of force of the magnetic field B is

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Magnetic intensity is a measure of lines of force passing through unit area held normal to it

Magnetic lines of force form a close curve

Inside a magnet, its magnetic lines of force move from north pole of a magnet towards its south pole

Due to a magnet magnetic lines of force never cut each other

In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°, the value of inductive reactance will be

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R/4

R/2

R

Cannot be found with the given data

A force of 10N is acting along y-axis. Its component along x-axis is

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10N

20N

100N

Zero N

According to classical theory the proposed circular path of an electron in Rutherford model of atom will be

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Circular

Straight line

Parabolic

Spiral

One cannot see fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplet in fog

How does the Young's modulus vary with the increase of temperature?

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Decrease

Increases

Remains constant

First increases and then decreases

To get a resultant displacement of 10 m, two displacement vectors of magnitude 6 m and 8 m should be combined

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Parallel

Antiparallel

At angle 60°

Perpendicular to each other

Which of the following is not thermo dynamical function?

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Enthalpy

Work done

Gibb's energy

Internal energy

To make the frequency double of an oscillator, we have to

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Double the mass

Half the mass

Quadruple the mass

Reduce the mass to one fourth

A body moves a distance of 10 m along a straight line under the action of a force of 5 Newton's. If the work done is 25 joules, the angle which the force takes with the direction of motion of the body is:

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0°

30°

60°

90°

Which of the following is a scalar quantity?

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Density

Displacement

Torque

Weight

When boron is added as an impurity to silicon, the resulting material is.

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n type conductor

n type semiconductor

p-type conductor

p-type semiconductor

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