Question # 1

The radius R of the earth is:

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6 x 10¹⁸m

6.4 x 10⁶m

6.4 x 10⁸m

6.4 x 10¹²m

Which of the following affects evaporation?

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Temperature

Surface area of the liquid

Wind

All of the above

When the cyclist stop pedalling, bicycle stops due to :

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Friction

Momentum

Weight

Mass

Thermal conductivity of iron is Wm^-1 K^-1

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85

36

89

86

Ability of body to do work due to its height is called.

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potential energy

kinetic energy

gravitational potential energy

elastic potential energy

If the distance is doubled between two masses. The gravitational force will decrease:

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4 times

2 times

One forth

One third

Heat can be transmitted form one object to the other by

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convection

radiation

conduction

all of these

Pressure is quantity:

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Scalar

Vector

Constnat

Dependent

__________ is a major source of heat:

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Mercury

Sun

Fire

Moon

False celling is done to

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Lower the height of ceiling

Keep the roof clean

cool and room

Insulate the ceiling.

Convention is done by ____________

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Vibration of atoms

Actual movement of particles

Same as conduction

Nil

In variable capacitor, dielectric medium is:

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Paper

Air

Mica

Ceramic

It is used in satellite communication:

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Radio waves

Micro waves

Light waves

Electrical waves

Angle opposite to the base of triangle of prism is called:

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angle of incidence

angle of refraction

angle of prism

emerging angle

Bets can hear sound of frequency up to:

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100,000 Hz

25000 Hz

120,000 Hz

1000 Hz

The half life of radium - 226 is 1620 years. If N is its total amount then after the four half lives, its left amount will be:

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1/2 N

1/4 N

1/8 N

1/16 N

the substance in which electric current flows easily is called:

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transistor

semi conductor

insulator

conductor

The presence of a magnetic field can be detected by a

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small mass

Stationary positive charge

Stationary negative charge

Magnetic compass

When a ray of light enters from denser medium to rare medium, the angle of incidence for which angle of refraction is 90° is called:

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Angle of incidence

Critical angle

Angle of refraction

Angle of deviation

Concave mirror formula is given by:

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R = 2r

sin<i/sin<r

1/f=1/p+1/q

1/f=1/p-1/q

The ratio of external force applied on the spring to displacement is called:

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Hook's law

Constant

Spring constant

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral particle

Repels a neutral particle

The angular acceleration a =

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When two waves of same frequency travel in opposite direction, the phenomenon will be

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Diffraction

Stationary waves

Polarization

Interference

Identity the non conservative force among the following.

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Frictional force

Electrical force

Gravitational force

Elastic restoring force

The property of bending of light around obstacles is

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Interference

Diffraction

Polarization

Superposition

The ratio of size of image and size of object is

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Focal length

Magnification

Resolving power

Principle focus

The Newton's formula for the speed of sound in air is

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A fog droplets are in freely falling condition,. the ratio of their radii is 2:3, the ratio of their terminal velocities will be.

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2:3

4:6

4:9

9:4

Time period of simple pendulum only depends on

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Mass

Amplitude

Density

Length

The ability of reveal the minor details of an object under examination is called.

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Resolving power

Magnification

Scattering

Reflection

Unit of acceleration is

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ms-1

ms

ms-2

m2s

The produce oscillation, body is pulled away from its

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Mean position

Extreme position

Both a and b

None of these

The magnitude of back emf:

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Increases with sped of motor

Decreases with speed of motor

Remains same

None of above

Pair production occurs only when energy of photon is at least equal in:

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1.02keV

1.02 eV

1.02 MeV

1.02 GeV

In according with Bohr's theory the K.E of the electron is equal to:

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ke²/2r

Ze²/r

Ze²/r²

Ze²/2r²

The output voltage of a rectifier is.

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Smooth

Pulsating

Alternating

Per featly direct

If the following particle have the same energy, which particle has the shortest wave length.

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alpha particle

Neutron

Beta particle

Proton

The effective way to increase the sensitivity of moving coil galvanometer is.

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Increase the area of coil

Increase the number of turn

Increase the magnetic field

Increase the value of constant C

An electron moves at 2 x 10² m/sec perpendicular to magnetic field of 2T what is the magnitude of magnetic force:

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1 x 10^-6 N

6.4 x 10^-17 N

3.6 x 10^-24 N

4 x 10⁶ N

1 tesla =

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1 MAm^-1

1NA^-1m

1NA^-1m^-1

None of above

Which of the following basic force is able to provide an attraction between two neutrons:

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Electrostatic and nuclear b

Electrostatic and gravitational

Gravitational and strong nuclear

Only nuclear force

Compton shift is maximum for scattering angle of photon

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0^o

90^o

180^o

45^o

In 1905, the special theory of relativity was proposed by

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Einstein

Bohr

Maxwell

De Broglie