Question # 1

A car battery has e.m.f 12 volt and internal resistance 5 x 10^-2ohm. If it draws 60 ampere current, the terminal voltage of the battery will be

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5 volt

3 volt

15 volt

9 volt

An object in SHM will have maximum speed when its displacement from equilibrium position is:

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Infinity

Maximum

Zero

Minimum

The irregular and unsteady flow of the fluid is called

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turbulent flow

steady flow

either of them

both of them

The Nobel Prize on the explanation of photoelectric effect was awarded to:

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Max. Planck

Maxwell

Bohr

Rutherford

None of these

Acceleration of body executing SHM is always directed towards

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Extreme position

Mean position

Along the direction of motion

None

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

The value of current gain of n-p-n transistor is of the order of

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tens

hundreds

thousands

ten thousands

An example of photoconductor is:

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Boron

Carbon

Iron

Aluminum

Selenium

A thermistor is a resistor which is:

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Light Sensitive

Heat Sensitive

Sound Sensitive

All of these

None of these

The mechanics, which deals with the objects moving with velocities approaching that of light is called:

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Relativistic mechanics

Wave mechanic

Quantum mechanics

Statics

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

A whistle is revolved with high speed in a horizontal circle of radius R. to an observer at the centre of the circle the frequency of the whistle will appear to be:

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Decreasing

Increasing

Both

Constant

The unit cell of the shape of match box is called

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Cubic

Tetragonal

Orthorhombic

Rhomboheral

The gravitational acceleration decreases inversely as the distance from the centre of the Earth is

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Square

One time

Three times

None of these

All real heat engines are less efficient than carnot engine due to

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Work substances

Friction

0 K

All of these

If radius of droplet is halved then is terminal velocity in viscous medium

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Doubles

Is halved

Becomes one fourth

Becomes four time

The phenomenon of blending of around edges of an obstacle is called:

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Interfarance

Defraction

Polorisation

None of above

A medium of dielectric constant 'K' is introduced between the plates of parallel plate condenser,As a result its capacitance

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Increase k time

Decrease k times

Decreases 1/k times

Remains unchanged

In YDS experiment, the condition for constructive interference of two coherent waves is that the path difference should be

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Integral multiple ofλ/2

Integral multiple ofλ

Even integral multiple ofλ/2

Both A and C

If a person with a spring balance and a body hanging from it goes up and up in an airplane then the reading of the weight of the body as indicated by the spring balance will

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Go on increasing

Go on decreasing

First increase and then decrease

Remains the same

Two vectors have unequal magnitudes can their sum be zero ?

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Yes

No

Can be zero

None of these

Diameter of the atom is of the order of

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10^-10m

10^-12m

10^-15m

10^-9m

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