Question # 1

If the acceleration of a body is not uniform, then velocity-time graph will be:

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Curve

Straight line

Sphere

All of these

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

A circuit has a resistance of 11Ωan inductive reactance of 25Ωand a capacitance reactance of 18Ω. It is connected to an a.c. source of 200 V and 50 Hz. The current through the circuit (in amperes) is

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11

15

18

20

Two sources of sound are said to be coherent if

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The produce sounds of equal intensity

They produce sounds of equal frequency

They produce sound waves vibrating with the same phase

They produce sound waves with zero or constant phase difference all instant of time

A magnifier gives an image which is:

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Virtual, inverted

Real, erect

Virtual, erect

Real, inverted

What must be changing when a body is accelerating uniformly?

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the force acting on a body

the velocity of the body

the mass of the body

the speed of the body

Which one is not produced by sound waves in air?

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Polarization

Diffraction

Refraction

Reflection

The band above the valence band is called

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high energy band

conduction band

empty band

none of them

A meter wire carraying a current of 2A is at right angle to the uniform magnetic field of 0.5 Weber/m²The force on the wire is

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5N

4N

1.5N

6N

Smaller the damping, greater will be the

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frequency

wavelength

amplitude

none of them

The highest value reached by voltage or current in one cycle is called

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root means square value

peak value

peak to peak value

instantaneous value

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

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torque

equilibrium

dynamic equilibrium

static equilibrium

Repeaters are the devices which regenerate the signals and are placed at about

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20 km

30 km

40 km

50 km

Newton published laws of motion in his famous book "principia" in

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1867

1667

1676

1687

Dimension of impulse is same as that of

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Force

Torque

Momentum

Angular momentum

If a person with a spring balance and a body hanging from it goes up and up in an airplane then the reading of the weight of the body as indicated by the spring balance will

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Go on increasing

Go on decreasing

First increase and then decrease

Remains the same

When a bicycle is in motion but not pedaled,the force of friction exerted by the ground on the two wheels is such that it acts

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In the backward direction on the front wheel and in the forward direction on the rear wheel.

In the forward direction on the front wheel and it the backward direction on the rear wheel.

In the forward direction on both the wheels.

In the backward direction on both the wheels.

If the unit of force and length are increased by four times then the unit of energy is increased by

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2 times

4 times

8 times

16 times

The first superconductor was discovered in

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1905

1911

19161

1920

The frame of reference in which Newton's first law of motion holds is known as

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non-inertial frame is known as

inertial frame of reference

both of them

neither of them

The largest satellite system in managed by countries

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112

140

126

107

Magnification of a convex lens is

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M = p/d

M = p/q

M = q/p

None of these

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