Question # 1

One femtometre is equl to

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10^-15 m

10¹⁵m

10^-9m

10⁹m

The most elastic material of the following is.

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Rubber

Steel

Wood

Glass

SI unti of linear momentum is

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kgm-1 s-1

kg m s-1

kg m2 s-1

Nm

When two curreint carrying wires in the same direction are placed parrallel near each other. due to magnetic field produced by each wire they.

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Repeal each other

Stop moving the current through them

Attract each other

Have no effect on each other

When a spring in compressed, what form of energy does it possess.

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Heat

Internal

Potential

Kinetic

What is mass of a liquid of density 50 kg m-3 in a container of volume 5 m3?

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200 kg

250 kg

225 kg

275 kg

A large force acts on an objet for a very short interval of time. In the case, it is easy to determine.

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Magnitude of force

Time interveal

Product of force and time

None of these

A cylinder resting on its circulr bases is in

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Neurtral equilibrium

Stable equilibrium

Unsatable equilibrium

None of these three

The force which moves the car is

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Force of friction between road tyre

Force developed by engine

Uniform velocity

Water split on the road

A displacement can is used to measure.

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Mass of liquid

Mass of solid

Volume of a solid

Volume of a liquid

Atmospheric pressur eis commonly measured using a.

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Hygrometer

Monometer

Barometer

Thermometer

In mathematical form of Ohm's law, "R" is:

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Resistance

Specific resistance

Resistor

Resistivity

D.C. motor converts.

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

The filament of an electric bulb is made of:

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Nickel

Aluminium

Tungsten

Carbon

The speed of sound in air at 0°C is:

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331ms^-1

376ms^-1

231ms^-1

386ms^-1

the power of washing machine is:

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700 W

750 W

650 W

800 W

The oscillations of a system in the presence of _____________ force are called amp oscillations:

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Resistive force

Attractive force

Both of these

None of these

The number of wavelength of waves passing through a point in one secnd is called:

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Time period

Cycle

Frequency

None of these

In a vacuum all electromagnetic waves have the same:

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Speed

frequency

amplitude

wavelength

Electronics is the study of principles by means of which we control the:

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Flow of electrons.

Nuclear fission

Fusion reaction

Radiations

If we double both the current and the voltage in a circuit while keeping its resistance constant, the power.

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remains unchanged

halves

doubles

four time

If the mass of the bob of a pendulum is increased by a factor of 3, the period of the pendulum’s motion will:

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Be increased by a factor of 2

Remain the same

Be decreased by a factor of 2

Be decreased by factor of 4

A swing is good example of

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Resonance

Vibration

Time period

Oscillation

Time rate of change of angular displacement is called

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Linear velocity

Angular velocity

Rotational velocity

Vibrational velocity

the work done in isochoric process is.

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Constant

Variable

Zero

Depend upon condition

In the absence of air resistance the acceleration of a body will be

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Uniform

Variable

Instantaneous

None of these

Torricelli's theorem is given by

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S.I Unit of pressure of gas is.

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Nm

N.m

N2/m

N3m

With increase of temperature, speed of sound.

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Remains constant

Becomes zero

Decreases

Increases

Size of the molecules is much smaller as compared to the

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Mass of the molecules

Distance between the molecules

Density of the molecules

Volume of the molecules

Before the launch of a rocket the mass of fuel of the rocket is approximately consists of.

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60%

50%

80%

100%

Speed of sound in vacuum is

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280 ms-1

332 ms-1

333 ms-1

Zero ms-1

A 60 kg man in an elevator is moving upward with an acceleration of 9.8 ms-2. The apparent weight of the man.

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Increase

Decreases

Remain constant

Becomes zero

In RLC series circuit at resonance the phase difference between capacitor and inductor reactance is.

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90^o

270^o

0^o

180^o

For normal use:

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Emitter base function is reversed biased

Collector base junction is reserved biased

Emitter base junction is forward biased

Both c and b

For Holography we use

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X ray

Laser

gama rays

Beta rays

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

The induced emf in a coil is proportional to:

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Magnetic flux through the coil

Rate of change of Magnetic flux through the coil

Area of the coil

Product of magnetic flux flux and area of the coil

In Helium Neon laser, the discharge tube is filled with

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80% He, 20% Neon

85% He, 15% Neon

83% He, 17% Neon

90% He, 10% Neon

When a wire of length 'l' and resistance R is cut into two equal parts then resistivity of each part.

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is doubled

Remains the same

Is halved

Is one fourth

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

The p-n junction in which p side is connected to+ive and n-side is -ve the junction is said to be:

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Neutral

Forward biased

Reversed biased

None of above

Selenium is a

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Insulator

Photoconductor

Conductor

First insulator then conductor

De-Broglie waves are associated with

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Moving charged particles only

Moving neutral particles only

All moving particles

All parties whether in motion or at rest