Question # 1

In open circuit electromotive force equal to

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Current

Resistance

Voltage

Inductence

When the deforming force applied on a body produces change in shape, thenit is said t be

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Tensile stress

Compression stress

Shear stress

Shear modulus

Push pull amplifiers employ

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One transistor

Two transistors

Three transistors

Four transistors

The diffraction of light was discovered by

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Newton

Young

Francesco Grimaldi

Hertz

Negative feedback

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Increases stability

Decreases stability

Produces oscillatory

Cannot occur

To measure the accurate value of potential difference across two points, the voltmeter should have.

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Zero resistance

small resistance

Large resistance

Infinite resitance

One of the device to produce plane polarized light is.

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A prism

A bi prism

A plane mirror

A nicol prism

Magnetic effect of current was discovered by

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Faraday

Fleming

Oersted

Ampere

The heat accepted and rejected by a Carnot engine operating between two heat reservoirs defines.

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The efficiency of the working substance of the engine

the ideal gas scale of temperature

The ratio of the absolute temperature of the reservoirs

The thermal capacity of the working substance

Max. Planck was awarded Nobel prize in.

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1916

1918

1921

1923

An ice making machine extracts energy at the rate of 500 W The specific latent heat of fusion of ice is 300 kj kg-1. How long does it take to freeze 2 kg of water at 0 oC.

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120 s

150 s

1200 s

1500 s

What is the basic advantage of class A operation of an amplifier.

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It has high efficiency

It has high gain

It has low distortion

It has high distortion

Mean free path in a gas is the

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Distance travelled by a molecule before hitting a wall

Average distance travelled by a molecule in one second

Average distance travelled between molecules between any two successive collisions

Root mean square velocity

A transformer is used to.

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Convert D.C. into A.C.

Convert A.C. in to D.C.

Obtain A.C. voltage

Enhance the power

How does viscosity affect relative motion between the liquid layers.

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Does not affect

Accelerates

May accelerate of retard

Retards

Ultrasonic sound waves

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Can be heard by a normal human ear

Can be heard with the help of hearing apparatus

Can be heard with the help of microphone

cannot be heard

A resistor connected to a battery is heated due to current passing through it. Which of the following quantity does not change.

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Resistivity

Resistance

Number of free electrons

Drift velocity

When a wire moves perpendicularly to a magnetic field, the induced emf does ot depends upon

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The velocity of the wire

The resistance of the wire

The flux density of the magnetic

The orientation of the wire field

Sounds of frequencies higher than 20,000 Hz are called.

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Super sonics

Infrasonic

Ultrasounds

Audible sound waves

When ever a system is made to complete a cyclic process the work done during the complete cycle.

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Is zero

Is negative

Is positive

Depends upon the path followed

The maximum number of rays required by a lens to form an image are

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2

3

4

Infinite

Interference effects of light were verified by

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Thomas Young

Newton

Bragg

Huygen

Which experiment is a demonstration that matter and energy can display properties of both waves and particles.

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young's double slit experiment

Division germier experiment

Heisenberg's uncertainty experiment

Stern Gerlach experiment

In order to har an echo what is the minimum distance between the sound and reflecting surface.

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0.65 m

16.5 m

1.65 m

165 m

A capacitor is connected to a battery The fore of attraction between the plate when the separation between them is halved will

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Remain the same

Become twice

Become 4 times

Become 8 times

Which quantity decay exponentially when a capacitors is discharged.

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Charge only

Charge and voltage only

Charge and current only

Charge voltage and current

A point source of light is situated at large distance The nature of the wave front at the point will be.

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Cylindrical

Spherical

Plane

Ellipical

In compound microscope, image formed by the eyepiece is

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Real

Invented

Erect

Diminished

What is the triple point of water.

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273 .15 K

0 K

100 K

0 oC

The term used for the emission of electrons when light strikes a surface.

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The zeeman effect

The photo electric effect

Skin effect

Compton effect

The index of refraction depends on

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the focal length

The speed of light

The image distance

The object distance

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