Question # 1

In n-p-n transistor, emitter base junction is kept

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reversed

forward biased

may be reversed or may be forward biased

none of these

The velocity of a projectile is maximum

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at the point of projection

just before striking the ground

at none of them

at both of them

An airplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically above a point A on the ground, a bomb is released from it. The bomb strikes the ground, at point B. The distance AB is

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1200 m

0.33 km

3.33 km

33 km

The vector is space has:

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One Component

Two Compnents

Three Components

Non of these

A wire is bent into a ring of radius R is given a charge q. The magnitude of the electrical field at the centre of the ring is

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Two

1/2

Zero

3/2

Two bodies of masses 1 kg and 5 kg are dropped gently form the top of a tower. A a point 20 cm from the ground both the bodies will have the same

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Momentum

Kinetic energy

Velocity

Total energy

Motional emf is called motional:

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Electromagnetic force and is measured in newtons

Electromotive force and is measured in volt

Electromotive force and is measured in newtons

Electromagnetic force and is measured in volts

None of these

The resonance will be sharp, if the amplitude decreases rapidly at a frequency

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equal to the resonant frequency

slight different from the resonant frequency

greatly different from the resonant frequency

any one of them

A rheostat can e used:

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As variable resistor

As potential divider

For varying the current

All of these

None of these

A typical rocket consumes about

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100 kg s^-1of fuel

1000 kg s^-1of fuel

10000 kg s^-1of fuel

100000 kg s^-1of fuel

Terminal velocity is the maximum velocity attained by a spherical droplet when the drag force______the weight of droplet:

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Is smaller than

Is greater than

Becomes equal to

None of these

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°

1 gm-cm^-3is equal to:

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10³kg-m^-3

10^-3kg-m^-3

1 kg-m^-3

10⁶kg-m^-1

The transition from solid state to liquid state is:

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Abrupt

Slow

Continous

Discontinous

Both (A) and (D)

F = I(L x B) is a

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vector

scalar

unit vector

none of these

A digital system deals with quantities or variables which have

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only one state

only two discrete states

three discrete states

four discrete states

The excess (equal in number) of electrons that must be placed on each of two small spheres spaced 3 cm apart, with force of repulsion between the spheres to be 10^-19N, is

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25

225

625

1250

Resistor is a device which convert electric energy to

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Heat energy

Chemical energy

Elastic energy

All of the above

The magnitude of induced emf depends upon the:

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

A convex lens acts as diverging lens when the object is placed:

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Between F and 2F

At 2F

With focal length

Beyond 2F

Physicist George Simon ohm was a

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German physical

French physicist

Chinese physicist

Russian physicist

The electric intensity outside the two oppositely charged parallel metal plates is

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Maximum

Minimum

Zero

Infinite

The state in which ice, water and vapour coexists in equilibrium is called

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zero degree celsius

zero degree fahrenheit

absolute zero

373 K

A typical rocket ejects the burnt gases at speeds over

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400 ms^-1

40000m s^-1

40000 ms^-1

60000 ms^-1

The current is measured in

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volts

watt

ampere

ohm

How is the image formed by a convex lens affected if the upper half of the lens is covered with a paper:

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The upper half of the image is cut off

The brightness of the image is reduced

The brightness of the image is increased

No effect at all

The displacement of body executing SHM is

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x_ocoswt

x_osinwt

x_osin²wt

Both A, B

The potential difference across the conductors should be maintained constant by connecting the ends of wire to the terminal of a device called a source of

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power

current

resistance

temperature

When a body is vibrating, the displacement from mean position:

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Increases with time

Decreases with time

Changes with time

None of these

To observe interference of light, the condition, which must be met with is that the sources must be:

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Monochromatic

Phase coherent

Both of above

None of above

A diode which can turn its current ON and OFF in nono seconds is called:

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LED

Photodiode

An ordinary diode.

Both (A) and (B)

Both (B) and (C)

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