Question # 1

The electric lines of force are

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Imaginary

Physically existing everywhere

Physically existing near the charge

All of the above

In the phenomenon of hysteresis

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

meganetism goes along the magnetising current

none of them

The highest efficiency of a heat engine whose low temperature is 17°C and the high temperature is 200°C is

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70%

100%

35%

38%

The path followed by the projectile is known as:

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Cycle

Hyperbola

Trajectory

Route

Two forces of 10 N and 8 N are applied simultaneously to a body. the maximum value of their resultant is:

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2 N

- 2 N

18 N

36 N

The third band of the colour code:

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Gives the number of zeroes

Is decimal multiplier

Gives the resistance tolerance

Gives the third digit

Both (A) and (B)

Rate of flow can be expressed in

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litre/sec

litre-sec

sec/litre

sec/litre-m

A 100 kg car is moving at a speed of 10 m/sec and comes to rest after covering a distance of 50 m. the amount of work done against friction is:

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+5 x 10¹J

+5 x 10²J

+5 x 10³J

+5 x 10⁴J

Huygen's theory cannot explain

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Diffraction

Interference

Polarization

Photoelectric effect

The missing mass which is converted to energy in the formation of nucleus, is called

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packing fraction

mass defect

binding energy

none of these

With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are

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Energy, momentum and mass

Energy

Energy and mass

Energy and linear momentum

If an amount of heat enters the system it could

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decrease the internal energy

not change the internal energy

increase the internal energy

none of them

A diffraction pattern is obtained using a beam of red light What will happen if the red light is replaced by blue light?

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No change

Diffraction bands become narrower and crowded together

Bands become broader and farther apart

Bands disappear

Charge to mass ratio (e/m) of a charge particle is also called its:

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Specific charge

Specific Force

Gyro-magnetic ratio

Magneto-mechanical ratio

When body is connected to earth then electrons from the earth flow into the body. It means that the body is

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Uncharged

An insulator

Positively charged

Negatively charged

The rate of change of angular velocity is called

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Angular displacement

Angular acceleration

Instantaneous velocity

None of these

The path difference involved in interference in thin films depends upon

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Thickness and nature of thin films

Angular of incidence of light

Nature of media on both sides of thin film

All of these

The rate of change of momentum of a molecule is equal to:

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Pressure

Work

Density

Force

The ability of a body to return to its original shape when applied force is removed is called

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Stress

Strain

Elasticity

All of them

The path followed by a ballistic missile is called

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parabolic trajectory

ballisitic trajectory

both of them

none of them

A force of 10 N displace an object by 10 m.If work done is 50 J then direction of force makes an angle with direction of displacement.

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120°

90°

60°

None of these

Angular velocity is proportional to

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1/r

1/r²

1/r⁵

The velocity of a body at some particular instant is called

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Initial velocity

Instantaneous velocity

Variable velocity

None of these

Two forces 3 N and 2 N are at an angle 0 such that the resultant is R.The first force is now increased to 6 N and the resultant becomes 2R.The value of θ is

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30°

60°

90°

120°

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