Question # 1

The product of force and time is called

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acceleration

linear momentum

angular momentum

impulse

The SI unit of electric field intensity is

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CN^-1

NC^-1or Vm^-1

JC^-1

AV^-1

A digital system deals with quantities which has discrete values:

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Two in number

One in number

Three in number

Four in number

None of these

The effects of bends in a wire on its electrical resistance are:

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Zero

Much larger

Larger

Smaller

None of these

A p-n junction is formed when a crystal of silicon is growth in such a way that its one half is doped with trivalent impurity and the other half with a impurity from

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2nd group

fourth group

fifth group

sixth group

Which of the following has a great concentration of impurity

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base

emitter

collector

none of these

If a force of 0.05 N produces an elongation of 20 mm in string, then its spring constant will be:

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250 N m^-1

25 N m^-1

2.5 N m^-1

None of these

Which one of the following causes production of heat when current is set up in a wire?

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Fall of electrons from higher orbits to lower orbits

Inter-atomic collisions

Inter-electron collisions

Collisions of conduction electron with atoms

A capacitor is charged with a battery and then it is disconnected. A slab of dielectric is now inserted between the plates, then

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The charge in the plates reduces and potential difference increase

Potential difference between the plates increase, stored energy decreases and charge remains the same

Potential difference between the plates decreases and charge remains unchanged

None of the above

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

An electron of charge e coulomb passes through a potential difference of V volts its energy in joules will be

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V/e

eV

e/V

V

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1.02 x 10^-3ms^-1

0.12 x 10^-3ms^-1

1.1 ms^-1

1.21 ms^-1

A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor The capacitor of the capacitor:

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Increases

Decreases

Remains unchanged

Becomes infinite

Age of the Universe is

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5 × 10¹⁵ sec

5 × 10¹⁷ sec

5 × 10¹⁹ sec

None of these

For atomic nucleus, the binding energy per nucleon with increase in mass number:

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Increases continuously

Remains same

Decrease continuously

First increases and then decreases with increase in mass number

One cannot see through fog because

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Fog absorbs light

The refractive index of fog is infinity

Light suffers total reflection at the droplet in a fog

Light is scattered by the droplets in fog

The number of significant figures in all the given number 25.12.2009,4.156 and 1.257 x 10^-4 is

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1

2

3

4

Charles Coulomb measured the force between two charges in

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1860 AD

1890 AD

1874 AD

1871 AD

The magnetism produced by electrons within an atom can arise from

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electrons orbiting the nucleus

both motions

none one these motions

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

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1890

1905

1914

1944

As the Earth spins on its axis, the satellite on the equator always the remains the

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Opposite point

Different points

Same point

None of these

Vectors are those physical quantities which requires

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Magnitude

Magnitude and directions

Direction

None of these

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