Question # 1

Which of the following diodes can operate in the reverse biased condition

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photo diode

light emitting diode

photo voltaic cell

none of these

When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity:

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Starts increasing

Starts decreasing

Becomes constant

Is called escape velocity

Good absorbers of heat are

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Poor emitters

Non emitters

Good emitters

Highly polarized

A ball is dropped vertically down and it takes time t to reach the ground. At time t/2

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The ball had covered exactly half the distance

The velocity of the ball was V/3 where V is the velocity when it reached the ground

The ball had covered less than half the distance

The ball had covered more than half the distance

A tube tapers from 20 cm diameter to 2 cm, the velocity at first cross-section is 50 ms^-1then velocity at second cross-section is

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5000 cms^-1

500 cms^-1

50 cms^-1

0.5 cm/s

An emf is set up in a conductor when it:

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Is kept in a magnetic field

Is kept in an electric field

Moves across a magnetic field

Both A and B

None of these

The root mean square voltage for alternating current is

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All of these

Work is always done on a body when:

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A force acts on it

It moves through certain distance

None of A and B is correct

Both A and B is correct

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

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2 Kg

3 Kg

4 Kg

8 Kg

A monkey sits on the pan of spring scale kept in an elevator. The reading of the spring scale will be maximum when

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Elevator is stationary

Elevator cable breaks and it falls freely towards earth

Elevator accelerates downwards

Elevator accelerates upward

The SI unit of magnetic flux is

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NmA^-2

NmA^-1

NAm^-1

Nm²A^-1

In deriving Bemoulli's equation, it is assumed that the fluid is

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Incompressible

Non-viscous

In a steady state

All of these

Characteristics of optic fibre is/are

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Much thineer

Light weight

Extremely wide bandwidth

All of these

Which of the following gives volts as its unit

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Current/resistance

Power x current

Rate of flow of charge

emf of a cell

The magnifying power of an instrument is expressed in

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Radians

Degrees

No units

None of these

The regular array of atoms in a crystal has spacing of the order of

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10^-16m

10^-14m

10^-10m

10^-6m

Ray optics is valid,when characteristic dimensions are

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Of the same order as the wavelength of light

Much smaller than the wavelength of length

Of the order of one millimeter

Much larger than the wavelength or light

The acceleration of the rocket is

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In semiconductors, at 0 K, the electrons in conduction band is

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Partially filled

No

Yes

None of these

When a ray of light goes from a denser medium into a rare medium

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The wavelength of light is decreased

The frequency of light increased

The speed of light is increased

The light undergoes a phase change of π

At 0 K a piece of Ge and Si is a perfect

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Conductor

Insulator

Semiconductor

None of these

In Millikan's oil drop experiment an oil drop is observed to move vertically upwards. The upward motion of the drop is due to

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Gravity

Viscosity

Buoyancy

Electric Field

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