Question # 1

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

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All of these

Electrons of an isolated atom are bound to the nucleus, and

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can only have distinct energy level

can only have same energy level

may or may not have distinct energy levels

none of these

Step up transformer has a transformation ratio of 3:2. What is the voltage in secondary, if voltage in primary is 30V:

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45 V

15 V

90 V

300 V

The force between two chares 0.06 m apart is 5 N. If each charge is moved towards the other by 0.01 m, then the force between them will become

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7.20 N

11.25 N

22.50 N

45.00

If an electron of charge 'e' is accelerated through a potential difference V., it will acquire energy

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Ve

V/e

e/V

2Ve

When a source of light isat very large distance,the shape of wavefront is:

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Spherical

Cylindrical

Plane

None of these

The velocity given to a body to go out of the influence of earth's gravity is known as:

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Terminal velocity

Orbital velocity

Escape velocity

None of these

The substance in which atoms are so oriented that the field produced by spin and orbital motion of the electrons might add up to zero,are called

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diamagnetic substances

ferromagnetic substances

paramagnetic substances

all of them

An A.C. voltmeter read 250 volts. The frequency of alternating is 50 Hz, the peak value of voltage is

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3525.0 volts

35.35 volts

353.5 volts

3.535 volts

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

The difference between C_pand C_vis equal to

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Universe gas constant

Plank's constant

Molar gas constant

Boltzmann constant

In projectile motion when a body is projected upward it must have

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Initial velocity

Angle θ < 90^o

Falling under gravity

All of these

The source in the heat engine is at

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Low temperature

High temperature

Zero temperature

None of these

If focal length of objective is increased

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Magnifying power of compound microscope decreased

Magnifying power of astronomical telescope increases

The diameter of the objective lens

None of these

When brakes are applied to a fast moving car, the passengers will be thrown:

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Forward

Backward

Downward

None of these

When the fuel ignited it turns to a gas at

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Low pressure

High pressure

Extremely high pressure

None of these

In the phenomenon of hysteresis.

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magnetism leads the magnetising current

magnetism lags behind the magnetising current

magnetism goes along the magnetising current

none of them

Which of the following types of optical fibre has a very thin core of about 5μm diameter and has a relatively large cladding?

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single mode step index fibre

multi-mode step index fibre

multi-mode graded index fibre

none of them

Which of the following is a scalar quantity?

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Displacement

Electric field

Acceleration

Work

Cladding means a layer of ______ refractive index over the central core of ______ refractive index

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Lower, lower

Higher, lower

Lower, higher

None of these

Compton Effect makes the use of the law of conservation of:

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Energy

Momentum

Charge

Both (a) & (b)

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