Question # 1

Emitter follower amplifier is an example of.

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Current series feedback

Voltage series feedback

Current shunt feed back

Voltage shunt feedback

The temperature of a certain substance in Celsius scale of temperature is 800 ^oC in Kelvin scale it is.

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173 K

931 K

1073 K

1193 K

The ration Cv/Cp = y for a diatomic gas like air is

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1.29

1.30

1.40

1.67

If we use two diodes and a centre tapped transformer we eill get

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Transistor

Amplifier

Half wave rectifier

Full wave rectifier

Balimer series lies in the

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Visible region

Invisible region

Infrared region

Far infrared region

When a beta particle travels though a medium it knocks out electrons from the atoms due to.

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Gravitational force of attraction

Electrostatic force of repulsion

Nuclear force

Electromagnetic induction

The nuclear model of the atom was derived partly from experiments involving the scattering of alpha particles performed by.

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Chadwick

Rutherford

Anderson

Einstein

The moment of linear momentum is equal to

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Implies

Torque

Angular momentum

Couple

Negative feedback

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Increases stability

Decreases stability

Produces oscillatory

Cannot occur

The thermionic current increases when

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Area of filament is decreased

Area of filament is increased

Temperature is decreased

Work function is increased

If an athlete uses 50 J of energy to lift a load in 2 s his muscular power is.

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125 W

250 W

500 W

1,000 W

During a thunderstorm, an observer sees a lighting flash Six second later he hears the thunder The speed of sound is 330 m s-1. Approximately how far away is the observer from the lighting.

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1/2 km

1/3 km

2 km

1/20 km

halls fall faster than rain drops due to their

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Grater size

Greater mass

Greater area

Structure

In a half wave rectifier the rms value of the A.C. component of the wave is.

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Less than D.C. value

Great her than D.C. value

Equal to D.C. value

Zero

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

A metallic rod is continuously heated at its two ends, The heat following through the rod does not depend upon.

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Mass of the upon

Area of cross section of the rod

Temperature gradient between two ends

Time for which heat flow through the rod

What kind of movement is dictated by the laws of thermodynamcis.

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Energy motion

Heat work

Light heat

Energy light

Lenses are commonly made of.

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Glass only

Plastic only

Glass and clear plastic

Aluminium

According to Coulomb's law what happens to the attraction of two oppositely charged objects as their distance of separation increases.

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Increase

Decrease

Remain unchanged

Cannot be determined

Density of blood a

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Equal to water

Greater than water

Less than water

zero

The total gain in entropy of the working substance in a Carnot cycle is.

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Positive

Negative

Infinite

Constant

The SI unit of absorbed dose in.

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Bel

Weber

Rem

Grey

To reduce spherical aberration in optical instruments which of the following should be used.

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Plano convex lenses

Concave lenses

Spherical mirrors

Plane mirrors

Cs - 137 is a radioisotope used ot determine the thickness of the walls of steel pipes Cs 137 is chosen because it emits

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Radiowaves

Alpha particles

Beta particles

gama particles

Which of the following causes the deflection of Alpha particles when they re passed through a thin foil.

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Attraction of nucleus

Collision with nuclei

Interactions with electrons

Electrostatic repulsion by the nucleus

A diode cn be used as

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Amplifier

Rectifier

Oscillator

Transistor

What is the traditional name for a capacitor

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Choke

Condenser

Transformer

Inductor

The centre of the sun produces a large amount of energy what is the source of this energy.

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Chemical reaction

Nuclear fission

Nuclear fusion

Radioactive decay

The first demonstration of wave nature of light was provided in 1801 by the experiment of

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HHuygen

Thomas young

Fresnel

Maxwell

The half life of a radioactive substance is 6 years What is the time taken by 12 g of this substance to decay completely.

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12 years

24 years

48 years

infinity

The input resistance of a JFET is of the order of.

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1 M Mega

10 M Mega

100 M Mega

1,000 M Mega

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