Question # 1

Natural radioactivity was discovered in.

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1978

1896

1904

1906

The ratio of average induced emf to the rate of changing of current in the coil is called.

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Self induction

Mutual induction

Self inductance

Mutual inductance

If velocity is doubled then

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Momentum increase 4 time and K.E. increase 2 times

Momentum increases 2 times and K.E. remains constant

Momentum increases 2 times and K.E. increases 4 times

Both momentum and K.E. remain constant

Ethanol is a replacement of

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Gasoline oil

Kerosene oil

Refinery oil

vegetable oil

An object is -14 cm in front of a convex mirror The image 5.8 cm behind the mirror. What is the focal length of the mirror.

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-4.1 cm

-8.2 cm

- 9.9 cm

-20 cm

Acceleration due to gravity is not affected by which one of the following

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Latitude

Attitude

Longitude

Depth

Angular moment is conserved due to

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Variable force

Constant force

Central force

Uniform force

Which of the following is a properly of a uniform gravitational field.

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If acts equally in all directions.

Its field strength is the same at all points with in it

the gravitational potential has the same value of all points with in it

It produces zero force on a stationary test mass placed in it.

Simple harmonic motion may be assumed as a projection of uniform circular motion along a

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Diagonal

Hypotenuse

Radius

Diameter

In case of a convex lens, image formed at 2 F is

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Virtual, erect and larger than the object

Real, inverted and large than the object

Real, inverted and same size as the object

Real, inverted and smaller than the object

When damping is small amplitude of vibrational resonance will be

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small

Large

Infinite

Un changed

Velocity of sound in any medium deepness upon.

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Elasticity

Density

Volume

Mass

The dimensions of work are

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[MLT-2]

[ML2T-2]

[ML2T-1]

[MLT-1]

The sun appears elliptical before sunset due to

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Reflection

Refraction

Scattering

Total internal reflection

Rate of change of momentum is called.

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Torque

Force

Impulse

Inertia

Distance between two consecutive nodes or antinodes is equal to.

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Lamda /4

Lamda

Lamda /2

2 lamda

Which one among these contacts in a transistor is non rectifying.

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Base

Emitter

Collector

None of these

Mean free path of gas molecules is inversely proportional to its.

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Volume

Pressure

Temperature

Weight

The source of geothermal energy is

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The fusion in the sun

the radioactive decay in the earths interior

the rotation of earth around the sun

The rotation of earth around its own axis

The length of an astronimical telescope for normal vision is.

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fo x fe

fe/fe

fo - fe

fo + fe

If we place oure hand below a lighted lamp we feel warmer due to.

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Conduction

Convection

Radiation

None of these

The rms value of emf in a circuit is given by a factor of.

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0.637

0.7

0.707

1.11

A straight wire carrying current will experience a force when placed in a uniform magnetic field if

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The current and field are parallel

The current and field are at an angle

the current and field are parallel in opposite directions

All of the above

The follow of heat from hot body to cold body is an example of

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Adiabatic process

Isothermal process

Reversible process

Irreversible process

When speed of a moving body becomes double.

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Its K.E. is doubled

Its acceleration is doubled

Its P.E. is doubled

Its momentum is double

At high altitudes, the blood flows out of nose and ear because.

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Blood pressure increase at high altitudes

Percentage of oxygen in the air increase

Atmospheric pressure decreases there

Density of blood decreases of high altitudes

The horizontal range is equal for the angles.

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30 ^o and 45 ^o

30 ^oand 60 ^o

45 ^o and 90 ^o

60 ^oand 75 ^o

The work required to lift a ball of mass 'm' from the surface of the earth to an infinite distance is

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Absolute P.E. of the body

P.E of the body

K.E. of the body

Chemical energy of the body

Matter waves

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Are electromagnetic in nature

Travel with the speed of light

Can be diffracted

Are longitudinal waves

The binding energy per nucleon for uranium is about.

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7.7 MeV

9.6 MeV

13.6 MeV

21.6 MeV

Why should household appliances be connected in parallel with the voltage source.

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To increase the resistance of the circuit

To decreases the resistance of the circuit

To provide each appliance the same voltage as the power source

To provide each appliance the same current as the power source.

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