Question # 1

Which of the following cannot be polarized.

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Ultraviolet rays

Radio waves

T.V waves

Sound waves

A logic circuit with one input and one output that inverts the input signal at the output is.

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AND gate

NOT gate

OR gate

NOR gate

The SI unit of coefficient of viscosity of

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kg m s-1

kg m-1 s-1

kg ms -2

An electric lamp use energy at the rate of 46 W on a 12 V supply. How much charge passes through the lamp in 2s.

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0.15 C

0.50 C

2.0 C

8.0 C

Relative permeability is

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The ratio of flux density in a material to that for a vacuum

Very large for paramagnetic materials

small for paramagnetic materials

None of these

When a monochromatic wave enters from one medium into another the property that remains unchanged.

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Amplitude

Velocity

Frequency

Nature of the wave

When Electric current flows through the wire it increases.

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P.E of the atoms

K.E. of the atomss

Atomic size

Number of protons

For which material magnetic susceptibility is negative.

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Paramagnetic

Diamagnetic

Ferromagnetic

All of these

A gama ray of energy 1900 MeV is absorbed by

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Proton antiproton pair

Electron positron pair

Producing heat in the substance

The orbit

The concept of entropy was introduced by

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Saadi Carnot

Boyle

Charles

Rudolph Celsius

The resistance of a wire does not depend upon.

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Area of cross section of the wire

Length of the wire

Temperature of the wire

Current passing though the wire

The magnetic force is simply a

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Reflecting force

Deflecting force

Restoring force

Gravitational force

The direction of electric field line surround the test charge -q id

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Parallel

Perpendicular

Radially outward

Radially inward

A transistor can be used as

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Oscillator

Amplifier

Switch

Both a and c

The best instrument used for the measurement of emf of a cell a

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A voltimeter

An ammeter

A potentiometer

Wheatstone bridge

Which materials have exactly zero electrical resistivity.

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Metals

Insulators

Semi conductors

Super conductors

An instrument which can float in the liquid to be tested and by means of which the specific gravity of the liquid may be determined is.

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Hydrometer

Barometer

Siphon

Lactometer

Which of the following is nearly monochromatic light.

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Light from fluorescent tube

Light from neon lamp

Light from sodium lamp

Light from simple lamp

The critical mass of a fission reaction is.

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The mass to start a nuclear fission reaction

The minimum mass for chain reaction

The size of the reactor core

The size of fuel plus the size of moderator

Light of passing through a polaroid is

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Plane polarized

Unpolarized

Circularly polarized

Elliptically polarized

The gas temperature is increased from 27 ^oC to 127 ^oC What is the ratio of mean kinetic energies.

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3/4

4/3

9/10

10/9

By decreasing angle between two vectors their cross product.

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Increases

Decreases

Remains the same

Vanishes

Refraction contributes to the formation of.

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Rainbows only

Mirages only

Echo

Rainbows and mirages

Select the one that is not a donar

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P

AS

Sb

In

The spacing of electric field lines between two identical point charges of opposite signs

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Is not indication of the field direction

Is not dependent on the magnitude of the charges

Is an indication of the field strength

Is large when the charges are very large

The closed end of an organ pipe having longitudinal stationary waves in it behaves as

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Antinode

Source of waves

Node

Antinode

In any fluid the effect of decrease in pressure with the increase in speed in a horizontal pipe is known as

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Bernoulli's effect

Venturi effect

Torriculli's effect

Shift effect

Increase in velocity of sound in air for 1 ^oC rise in temperature is.

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0.61 m s-1

1.61 m s-1

2.00 m s-1

61.0 m s-1

The spin angular momentum and orbital angular momentum are usually differentiated in terms of.

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Radius of bodies

Mass of bodies

Torques of bodies

Momentum of bodes

A heat engine can develop efficiency equal to 100% if the temperature of the sink is

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Less than that of source

Equal to that of source

0 K

0 ^oC

Thermocouple is combination of.

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Thermocouples

Capacitors in parallel

Resistors in series

Ammeter and voltmeter

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