Question # 1

An aircraft is moving with a velocity of 300 ms^-1. If all the forces acting on it are balanced, then

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It still moves with the same velocity

It will be just floating at the same point in space

It will be fall down instantaneously

It will lose its velocity gradually

An LED emits light when it is:

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Forward biased

Reverse biased

Operated without battery

Operated with heat source

None of these

Most of the geysers occur in:

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Volcanic regions

Magnetic regions

Northern region

None of these

At resonance, the phase angle for RLC series resonance circuit equals

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0°

90°

180°

270°

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done is 25J. the angle which the force makes with the direction of motion will be:

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60°

90°

30°

0°

As compared to the distance measured by an observer on Earth, the distance from Earth to a star measured by an observer in a moving spaceship would seem:

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Smaller

Lerger

Same

Much larger

None of these

If the ratio of densities of two gases is 1:4, then the ratio of their rates of diffusion into one another is

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2 : 1

4 : 1

1 : 4

3 : 4

To see the minor details of the object by microscope, it should have:

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High magnifying power

High resolving power

Am objective of larger focal length

None of these

The output voltage of half wave rectification is in the form of

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a smooth curve

a smooth wave

pulses

all of the above

The sum of positive and negative peak values is called:

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Instantaneous value

Peak value

Rms valuie

Peak-to peak-value

None of these

A train cover 90 km in half an hour. the time taken by it to travel 15 km will be:

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20 minutes

48 minutes

10 minutes

5 minutes

A body is moving with a uniform speed along a straight line.Its angular momentum with respect to a fixed point away from the line

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Increases as the body moves away from the point

Decreases as the body moves away from the point

Is zero

Is constant and does not depend on the position of the body

Types of physical quantities are

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one

Two

Three

None of these

Which of the following have same SI units

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Force

Impulse

Momentum

B and C

A circuit that converts Pulsating DC into smooth DC contain :

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Filter

Capacitor

Inductor

LC circuit

The ratio of shearing stress/shearing strain is called as

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modulus

Pascal modulus

Hooke's modulus

shear modulus

The quantity F x t is called as

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momentum

velocity

acceleration

impulse

The temperature at which all the gases become liquid is called:

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273 K

-273 K

Absolute Zero

Both (B) and (C)

Power loss taken place when a light signal travels along fibres by

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Multiple reflection

Light absorbed due to impurities in glass

At joint some light is scattered by group of atoms

All of these

In a astronomical telescope the final image for normal vision is formed at

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The focal of the eye piece

The least distance of the distinct vision

The focus of the objective lens

Infinity

Viscosity of gas with increase in temperature

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Decreases

Increases

No change

All

The study of atomic structures of crystals by X-rays was started in

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1890

1905

1914

1944

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