Question # 1

Any transparent medium bounded by one or two spherical surfaces is called

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Prism

Lens

Plane mirror

Grating

The ratio of the rms value of the applied voltage to the rms value of resulting A.C. is called.

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Reluctance

Impedance

Reactance

Resistance

A gallium atom is.

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Monvalent

Diavalent

Trivalent

Pentavalent

What is the SI unit for thermal conductivity.

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W m-1 K-1

W m-2 k-2

W m-3 k-1

J kg -1 k-1

The blooming of the image due to dispersion in lenses is called.

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spherical aberration

Chromatic aberration

Astigmation

Curvature of image field

Which one of the following materials has negative temperature coefficient.

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Conductors

Semiconductors

Insulators

Covalent bonds

An ideal engine can be 100% efficient only if its exhaust temperatute.

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Equal to input temperature

Less than is input temperature

More than its input temperature

0 ^oC

linear magnification is the ratio between the

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Distances of object and image from mirror

Distances of object and image from the focal point

Distance of image and object from the mirror

Distance of image from object and the distance of object from mirror

A man of mass 100 kg is standing in an elevator. The net force acting on the man reads its weight when the elevator is going up with acceleration 4 m s-2 would be.

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100 N

590 N

490 N

980 N

Slip Rings are used in

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D.C. dynamo

A.C. dynamo

Transformers

Battries

If average acceleration is equal to instantaneous acceleration then the body's said to be moving.

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Negative acceleration

Positive acceleration

uniform acceleration

Variable acceleration

What is the properly of materials that responds at an atomic or subatomic level to an applied magnetic field.

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Magnetism

electroplating

Diamagnetism

Electrolysis

Monochromatic ight is of single.

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Frequency

Wave length

Amplitude

Pitch

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

Which of the following proves that light waves are transverse in nature.

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Diffraction

Interference

Polarization

Refraction

The critical mass of a fissionable material is.

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1 kg

10 kg

100 kg

1.,000 kg

Which of the following is a method of energy transfer.

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Conduction

Wave motion

Radiation

All of these

The rms value of alternating current is always

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Infinity

Unity

Positive

Negative

Which thermodynamic law state taht the entropy of a perfect system approaches zero.

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Zeroth law of thermodynamics

First law of thermodynamics

Second law of thermodynamics

Third law of thermodynamics

The primary purpose of using a large aperture objective in a telescope is to produce

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Brighter image

Larger image

Wider field of view

Smaller image

The quality of sound

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Decreases with pitch

Varies directly as its pitch

Varies inversely as its pitch

Depends upon the overtones present there

The scientist who first noted that a compass needle was deflected when in the neighborhood of a current carrying wire was.

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Joseph Henry

Hans Christian Oersted

Michael Faraday

J.J. Thomson

When did an international committee agree on a set of definition of units.

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1912

1956

1960

1986

The circular motion of a particles with constant speed is.

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Periodic and SHM

Periodic but not SHM

SHM and not periodic

Neither periodic nor SHM

Binding energy per nucleon is.

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Greatest for heavy nuclei

Least for heavy nuclei

Greatest for light nuclei

Greatest for medium weight nuclei

What is a measure of the separation of positive and negative electrical charges in a system of charges.

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charge polarization

Electric dipole moment

Electric field

Electrostatic induction

The magnetic field inside a solenoid is

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Zero

Infinite

Uniform

Non uniform

In CC configuration voltage gain is.

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Less than one

More than one

One

Zero

If two bodes are under a collision that is not perfectly elastic then.

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K.E. is conserved but momentum is not

Momentum is conserved but K.E. is not

Neither K.E. nor momentum is conserved

Both K.E. and momentum are conserved

How eddy current losses are reduced in A F and R F transformers.

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By using air cores

By using shell cores

By using laminated cores

By using ferrite cores

If temperature of the sink is decreased the efficiency of a Carnot engine

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Increases

Decreases

Remains constant

First increases and thend ecreases

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