Question # 1

Density of water in kgm^-3 is:

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1000

4200

4300

4500

The velocity of freely falling bbodies moving upward.

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Decreases

Increases

Constnat

zero

Running water possess energy:

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Kinetic

Potential

Elastic Potential energy

Gravitational potential energy

The unit of momentum is:

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kgms^-2

kgms^-1

Ns^-1

None of these

Dull black surface is a best:

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Emitter

Absorber

Reflector

None of these

At the surface of Earth, the acceleration due to gravity 'g' is measured by using the formula

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g = GMe/R

GMe/R2

g = 2GMe/R2

g = GMe/2R

The Earth attracts a body with a force equal to its:

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Velocity

Gravity

Weight

Mass

A ball of mass 1 kg moving wih velocity 2 ms^-1 its momentum will be;

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1 Ns

2 Ns

0.5 Ns

4 Ns

Mathematically density is defined as

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mass/volume

force/area

volume/mass

mass/area

The unit of Heat is:

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Kelvin

Joule

Jkg^-1 K^-1

kg

Which of the following is non-renewable fossil fuel?

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Oil

Coal

Gas

All of these

The displacement produced in the spring is directly proportional to force is called:

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Hook’s law

Boyle’s law

Newton’s law

Joule’s law

If there is no extension in the spring then the position is called:

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Equilibrium position

unequilibrium

neutral equilibrium

stable equilibrium

What is fitted in telephone receiver:

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Electromagnet

Diaphragm

Both a and b

None

It mean position kinetic energy of the ball is:

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Minimum

Zero

Maximum

None of these

An object is placed at the Centre of curvature of a concave mirror. The image produced by the mirror is located:

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Out beyond the centre of curvature

At the centre of curvature

Between the centre of curvature and the focal point

At the focal point

At room temperature, electrons cannot escape the metal surface due to ………….. of atomic nucleus:

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Repulsive forces

Attractive forces

Gravitational forces

Electromagnetic forces

Which animal have ability to move his eye lens:

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Snake

Fish

Ant

Tiger

The critical angle for a beam of light passing from water into air is 48.8 degrees. This mean that all light rays with an angle of incidence greater than this angle will be:

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Absorbed

Totallly reflected

Partially reflected and partially transmitted

Totally transmitted

The half life of argon nuclide Ar-40 is:

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2 x 10⁸years

2 .2x 10⁸years

2.4x 10⁸years

2.8x 10⁸years

Current is equal to:

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IR²

CV

Q/t

IR

The way of doing business by using web is called:

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Sources of entertainment

Web business

E-commerce

E-mail

The potential energy to the molecules of an ideal gas is considered to be.

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Maximum

Zero

1/2 kx²

1/2 kx

the shortest distance between two points is called.

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Speed

Acceleration

Distance

Displacement

When a body is moving along a circular path, then such a motion is called

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Vibratory motion

Rotatory motion

Linear motion

None of these

The speed of sound in ari at 0 ^oC is 332 ms-1, Then the speed at 40 ^oC will be

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372 ms-1

356 ms-1

346 ms-1

332 ms-1

If an object is placed with in the focal length of a convex lens, its image is formed.

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Real

Inverted

Virtual

Smaller than object

When a vector is multiplied by a (-)ve number its direction

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Remains constant

Reversed

Change by 90°

None of these

An ideal reversible heat engine has

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100% efficiency

Highest efficiency

80%

90%

The profile of periodic waves generated by a source executing S.H.M is represented by a.

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Circle

Sine curve

Tangent curve

Cosine curve

The speed of sound in air does not depend upon

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Temperature

Pressure

Density

Medium

The dimension of power is

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MLT-1

ML2T-2

ML2T2

ML2T-3

The moment of inertia is analogue to

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Mass

Weight

Torque

Force

To convert a galvanometer into an ammeter, we connect with it a

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Shunt resistance

Low value parallel

Low value by pass resistor

All of above

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

Calculate current in 2 2R /4Ω resistor.

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1 A

2R /4Ω

R/3Ω

2R /3Ω

The SI unit of decay constant is

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m

m^-1

S^-1

Nm^-1

In modulation, low frequency signal is known as

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Carrier wave

fluctuated signal

Modulated carrier signal

Modulation signal

The average gap for Germanium at 0K is

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1.12 ev

0.02 ev

6.72 ev

7.2 ev

The term invertor is used for.

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NOR gate

XNOR gate

NAND gate

NOT gate

Presence of dielectric between two charges always.

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Reduces the electric force

Enhance the electric force

Does not effect electric force

Double the electric force

Which of the following is typical source of alpha particle.

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Strontium -94

Radon -222

Cobalt -60

Zic sulphate

A semiconductor in its extremely pure form is known as:

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Intrinsic

Extrinsic

Both a and b

None of above

In photovoltaic cell, current is directly proportional to.

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Wavelength of light

Intensity of light

Energy

Frequency of light