Question # 1

Transistor stands for

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Transfer of resistance

Transfer of current

Transfer of power

Transfer of voltage

The near point of a person is 50 cm and his far point is 200 cm The power of the lenses which his spectacles should have for reading will be

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+D

+2D

+4D

-2D

A bulb of 100 W is connected to a 160 V supply What will be the power consumed.

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25 W

30 W

50 W

64 W

Davison and Germer received the Nobel Prize in

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1929

1931

1935

1937

If the transformer turns ratio is 2 and the impedance eof primary coil is 250 Ohms then the impedance secondary coil will be.

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125 Ohms

250 Ohms

500 Ohms

1000 Ohms

X-rays eject electrons from matter by

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Pair production

Pair annihilation

Compton effect

Photoelectric effect

The phase different between the particles vibrating's between two consecutive nodes is.

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0

Lamda /2

2

2 lamda

Natural radioactivity was discovered in.

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1978

1896

1904

1906

In the experiment of production of X rays the anti cathode should be bombarded with.

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A particles

Beta particles

Electrons

Protons

During an adiabatic gas expansion the environment

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Serves as a heat sink

Serves as a heat source

Must be at a higher temperature than the gas

Does not have to participate

A heat engine with 100% efficiency would have to.

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Do no work

Be at uniform temperature

Use no heat

Discharge of 0 ^oC

The shape of wave front depends on

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Density of medium

Shape of medium

Viscosity of medium

Length of medium

Which italian inventor is credited with describing and sketching the first ideas for contact lens in 1508

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Galileo

Leonardo da vinci

roger Bacon

Hans Lipperahey

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

In order of a cyclic heat engine operating between two heat reservoirs to be as efficient as a Carnot engine. It must be.

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A gas engine

Adiabatic

Reversible

A refrigerator

Woolen clothing a effective in keeping us warm because.

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An trapped int he wool acts as an insulator

Heat loss by convection and radiation is prevented

Wool is bad traciator and good absorber of heat

Wool can retain high temperatures

A force applied at centre of mass of a body

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Does not produce any torque

Produces torque

Produces acceleration

Produce couple

Which vector gives the displacement from one point to another in space.

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Position vector

Unit vector

Null vector

Distance vector

The perpendicular distance between the line of action of forces and the axis of rotation

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Torque

Moment arm

Moment of force

Momentum

Which of the following is an example of negative work.

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a thrown up cricket ball

Grass mower

A car on road

Bucket in the well

Which of the following is the ability to hold an electric charge in electromagnetism.

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Resistance

Impedance

Inductance

Capacitance

A bus and a car moving with the same K.E. are acted upon by the same retarding force then the

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car will stop first

Bus will stop first

Both will stop simultaneously

Both will never stop

Low frequency response of an amplifier is mainly limited by.

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Biasing configuration

Coupling capacitor

By pass capacitor

Input impedance

LASER beam my be measure very large distance because it is.

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Inidirectional

coherent

Monochromatic

Not absorbed

When a man jumps off the ground, the reaction force of the ground is.

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Equal to the weight of the man.

Smaller than the weight of the man

Greater than the weight of the man

Zero

When did max planck suggest that energy is released or absorbed in discrete packets.

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1899

1900

1905

1911

Who wrote books on sound and music.

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Galileo

Alkundi

Alberuni

Ibn al Haithem

When a diamagnetic substance is inserted in a current carrying coil the magnetic field is

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Decreased

Increased

unchanged

Increased or decreased, depending upon the relative volume of the substance

At high frequency the current through a capacitor will be

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Small

Zero

Large

Infinity

How do solar heat and light reach the Earth.

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By radiation

By convection

By conduction

By conduction and convection

Drag force between two layers under consideration depends on

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Distance between the layers

Surface area of layers

Relevant velocity between them

All of the above

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