Question # 1

The induced current in the loop can be increased by:

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Using a strong magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All of above

None of these

Self inducede e.m.f. is also called

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Motional e.m.f.

Thermistor

Electrostatic induction

Back e.m.f

If the stress increased beyond the elastic limit of the material. the deformation produced in the material will be

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permanent

temporary

either of them

none of them

The force exerted on a conductor of length L, carrying current I when placed in a magnetic field B is given by

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F=IB/L

F= L x B/I

F = IL x B

F = IL . B

In order to have a constant current through wire, the potential difference across its end should:

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Be zero

Be maintained constant

Goes on increasing

Go on decreasing

Both (A) and (B)

The work done on the body will be zero if:

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No force is applied on the body

Force is applied but no displacement

Angle between F(force) and d(displacement) is 90°

All of these are correct

Tick the conservative force:

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tension in a string

Air resistance

Elastic spring force

Frictional force

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

The value for systolic blood pressure for a normal healthy person is

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140 torr

80 torr

90 torr

120 torr

As the light shines on the metal surface, the electrons are ejected

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slowly

instantaneously

either of these

none of these

During the free fall motion of an object, when its weight becomes equal to the drag force, then it will move with

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maximum speed

zero speed

maximum speed

none of them

While vibrating the atoms are at their

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Fixed positions

Extreme position

Average positions

None of these

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

The charged nucleus of an atom itself spins its magnetic field is

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Equal to the field produced by orbital electrons

Greater than the field produced by orbital electrons

Much weaker than the field produced by orbital electrons

Very strong

A body starting from rest covers a distances of 0.45 km and acquires a velocity of 300 Kmh^-1its acceleration will be

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7.71 m s^-2

0.5 m s^-2

0.15 m s^-2

0.092 m s^-2

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

In semiconductors, the valence band at room temperature is

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Completely filled

Partially filled

Empty

None of these

Two small spheres of radii r and 2r fall through a viscous medium with constant speed the viscous forces experienced by them are in ratio

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1 : 2

2 : 1

1 : 4

4 : 1

When R^x is negative and R^y is positive, the resultant lies in the second quadrant and its direction is

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θ = 90 + Φ

θ = 180 - Φ

θ = 180 + Φ

None of these

If a body is at rest, then it is said to be in

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torque

equilibrium

dynamic equilibrium

static equilibrium

Fringe spacing ΔY is the distance between two adjacent bring fringes on the screen is

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ΔY = Lλ/d

ΔY = Ld/λ

ΔY = dλ/L

ΔY = Lλ/d m

In time of flight, the body the covers the distance

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Maximum

Zero

Minimum

None of these

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