Question # 1

From sand, we get a material used for construction of computer chips. That material is called:

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Germanium

Silicon

Copper

Lead

The passage of current is accompanied by a magnetic field in the surrounding space:

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Always accompanied

Sometimes accompanied

Never accompanied

Any of above

None of these

A condenser of capacity 50μF is charged to 10 V.The energy stored is

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1.25 x 10^-3J

3.75 x 10^-3J

2.5 x 10^-3J

5 x 10^-3J

Xerography means:

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Dry writing

Wet writing

Poor writing

Excellent writing

Both (A) and (B)

The surface destiny of charge is defined is:

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Charge per volume

Mass per volume

Charge per area

Mass per area

Both (B) and (C)

A magnifier gives an image which is:

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Virtual, inverted

Real, erect

Virtual, erect

Real, inverted

The direction of velocity is along the direction of

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distance

displacement

acceleration

all of them

When an object moves with a uniform angular velocity, then its instantaneous angular velocity is equal to:

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Zero

Its average velocity

Its angular displacement

None of these

The information from far side of the universe are gathered by:

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Radio telescope

Microscope

Telescope

Spectro scope

When a position comes close to an electron they annihilate into photons such that

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each photon has energy 0.51 Me v

each photon has energy 1.02 Me v

each photon has energy 0.25 Me v

none of these

Angular momentum is a:

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vector quantity

Imaginary quantity

Complex Quantity

Scalar Quantity

At what point/points in its path does a projectile have it minimum speed ?

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At the point of projection

At maximum height

All the point where it strikes the ground

None of these

One degree of thermodynamics scale of temperature is called:

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Celsius

Fahrenheit

Kelvin

Radian

The acceleration of the rocket is

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a = MV/m

a = mM/V

a = mM/2V

a = mV/M

A gas exerts pressure on the walls of the container because molecules

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Have finite size

Obey Boyle's law

Have momentum

Collide with one another

Blood vessels under normal conditions are inflate

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Occasionally

Some times

All the times

None of these

If the line of action of force F passed through the axis of rotation or origin then its torque is

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Maximum

Minimum

Zero

None of these

The venturi meter is a device used to measure the fluid

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Pressure

Quantity

Temperature

Speed

At any point on the right bisector of the line joining two equal and opposite charges

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At electric field is zero

The electric potential decreases with increasing distance from the centre

The electric potential is zero

The electric field is perpendicular to the line joining the charges

Which of the following atoms cannot be detected by X-ray crystallography?

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carbon

nitrogen

hydrogen

neon

The terminal velocity of falling object will be proportional to

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r²

1/r²

r

1/r

In case of streamed lined flow of liquid.the loss of energy is

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Maximum

Minimum

Infinite

Equal to what is in turbulent flow

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