Question # 1

Electric lines of force

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Intersect each other

Are always parallel

Are always anti-parallel

Never intersect

None of these

A body is moving with constant velocity of 10 m/sec in the north-east direction. Then its acceleration will be:

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10 m/sec²

20 m/sec²

30 m/sec²

Zero

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

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Unity

Infinity

Zero

-Fd

F = I(L x B) is a

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vector

scalar

unit vector

none of these

In radio-active decay, the original element which disintegrate to another element is called

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element

daughter element

parent element

none of these

To and fro motion of a body is about its mean position is known as:

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Translatory motion

Vibratory motion

Rotatory motion

None of these

Total number of turns on 0.15 m length solenoid is 300. the value of n is:

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Greater than 300

Smaller than 300

Equal to 300

Any of (A) or (B)

Any of (A) or(C)

The total work done in moving the body up and then down through the same height in a gravitational field is equal to:

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mgh

Its wight

Weight X height

Zero

Silicon can be obtained from

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Lead

Uranium

An isotope of oxygen

Sand

The substances whose resistance decreases with the increase in temperature these substances have coefficient of

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positive temperature

negative temperature

absolute temperature

zero temperature

The consumption source if energy is:

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Energy from blomass

Hydroelectric energy

Geothermal energy

None of these

Electric flux depends upon

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The charge only

Medium only

Both charge & medium

Permittivity & area

If we keep the moment arm constant and increase the applied force, then the torque will

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remain the same

decrease

increase

all of them

When a stress changes length, it is called the

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compressional stress

tensile stress

shear stress

any one of them

Super conductors are the those materials whose resistivity becomes zero below certain temperature called

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Curie temperature

Fixed temperature

Critical temperature

None of these

The expansion or compression must take place slowly in order to keep constant

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Volume

pressure

Temperature

None of these

A force passing through the center of gravity of a body

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Results only in rotational motion

Results only in translational motion

Holds the body in equilibrium

None

If unit of length mass and time each be doubled the unit of work done is increased by

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4 times

6 times

8 times

2 times

The direction of force experienced by a moving in a magnetic field will be:

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Parallel to the field

Opposite to the field

Parallel to its direction of motion

Perpendicular to both the field and the velocity vector

Which one is the case when the wavelength is actually changed?

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When source move relative to observer

When observer move relative to source

When observer moves around a stationary source at the center of circle

When the relative displacement between source and observer is zero

Two bodies with kinetic energies in the ratio 4 : 1 are moving with equal linear momentum.The ratio of their masses is

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1 : 2

1 : 1

4 : 1

1 : 4

In a uniform circular motion of a particle, the direction changes but not its

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Angular displacement

Magnitude of velocity

Force towards centre

b and c

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