Question # 1

When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is:

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0.5 J

2 J

0.25 J

1 J

When force and displacement are perpendicular to each other than work is equal to

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Unity

Infinity

Zero

-Fd

Which of the following four statements is false?

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A body can have zero velocity and still be accelerated

A body can have a constant velocity and still have a varying speed

A body can have a constant speed and still have a varying velocity

The direction of the velocity of a body can change when its acceleration is constant

1 gm-cm^-3is equal to:

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10³kg-m^-3

10^-3kg-m^-3

1 kg-m^-3

10⁶kg-m^-1

A 50 volt battery is connected across 10 ohm resistor. The current is 4.5 A. The internal resistance of the battery is

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Zero

0.5Ω

1.1Ω

5.0Ω

When the p-n junction is forward biased its resistance is of the order of

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few mega ohms

few kilo ohms

few ohms

few milli ohms

The valence band of an atom in a solid

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is always empty

may or may not be empty

can never be empty

none of them

The dimension of linear inertia is:

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MLT²

ML°T^-2

ML°T°

MLT^-1

In gases, the charge carriers are:

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Electrons

Positive ions

Negative ions

Both A and C

Both A and B

The ratio of velocity of sound in air at 4 atm pressure and that at 1 atm pressure would be

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1 : 2

4 : 1

1 : 4

2 : 1

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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ON switch

off switch

function switch

none of these

A couple consists of

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Two equal and opposite forces acting at a point on a body

Two equal and parallel forces acting at a point on a body

Two equal and anti parallel forces acting at two different points on a body

All of these

Recent studies of ferromagnetism have shown that there exists in ferromagnetic substances small regions called

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tiny regions

domains

vectors

none of them

The centre of gravity of an object is

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The point at which the gravity not acts

The point at which the total torque is minimum

The geometrical centre of the body

The point at which the weight of the object seems to act

Adiabatic change occurs when the gas expands or compresses when contained in an insulated cylinder

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Slowly

Very slowly

Rapidly

None of these

In a laminar flow of non-viscous fluid along a horizontal pipe,the work done per second by the pressure at any section is equal to

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The pressure

Pressure x volume per second

Pressure x area of cross-section

Pressure x volume

After curie temperature iron is

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Ferromgnetic

Diamagnetic

Paramagnetic

None

With rise in temperature the electric conductivity of intrinsic semiconductor

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Increases

Decreases

First increases and then decreases

First decreases and then increases

Consult page 50 of your text and trick the correct statement.

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Velocity of x-rays is greater than velocity of light

Velocity of right light is less than velocity of radio waves

Velocity of light, x-rays and radio waves is the same

None of the above is correct

The principle characteristics of an ideal standard are

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Inaccessible and invariable

accessible and invariable

Accessible and variable

None of these

The size of the molecules in comparison with the separation between the molecules is

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Small

Very small

Extremely small

None of these

Bulk modulus is involved when the deformation is

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One dimensional

Two dimensional

Three dimensional

All of these

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