Question # 1

Which one is more elastic ?

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Rubber

Steel

Copper

All has equal values

Work done is maximum when angle between force and displacement is:

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45°

0°

60°

90°

__________ expands on heating?

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Matter

Plasma

Gas

Solid

The altitude of geostationary orbits in which communication satellites are launched above the surface of the Earth is

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850 km

1000 km

6400 km

42,300 km

In a right angle triangle base is 4 cm and perpendicular is 3 cm length of diagonal will be:

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2 cm

5 cm

4 cm

6 cm

Air and water is conductor:

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Poor

Good

Excellent

None of these

How does heat reaches form sun to earth through?

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Conduciton

Convection

Radiation

None

Unit of Resultant force is:

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Nm^-2

N.m

Nm^-1

N

A sugar bag of 1 kg has a momentum 25 kg m/s than its velocity is :

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v = 20 m/s

v = 25 kg

V = 25 m/s

v = 25 kg/ms-1

If the direction of motion of the force is perpendicular to the direction of motion of the body then work done will be:

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Maximum

Minimum

Zero

None of these

Ship and boats are designed on the principal of

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Charge

Densities

Volume

Floatation

Spherical mirrors are used in:

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Medical

Search light

Microscope

All of these

Which of the following tasks are performed by most of the algorithms?

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Input

Out put

Processing

All of these

If a dielectric medium is present between two point charges them electrostatic force will be:

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Increased

Decreased

Vanishes

Remain same

A data storage device is.

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Printer

Hard disk

Monitor

CPU

The turn ratios of a transformer is 10. It means.

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I_s = 10I_p

N_s = N_p

N_s = 10 N_p

V_s =V_p /10

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attracts a neutral particle

Repels a neutral particle

A converging mirror with a radius of 20 cm creates a real image 30 cm from the mirror. What is the object distance?

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5.0 cm

7.5 cm

15 cm

20 cm

A data storage device is:

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Printer

Hard disk

Monitor

CPU

When a potential of 10 volt is applied across a conductor, a current of 5 miliampere flows through it, the resistance of the conductor will be:

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200 ohm

2000 ohm

0.2 ohm

0.002 ohm

The number of lines of force in a magnetic field depends upon.

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Shape of coil

Sixe of coil

Magnet

Strength of field

The angle at which prism deviates the incident ray is called:

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Angle of incident

Angle of reflection

Angle of deviation

Angle of minimum deviation

The apparent change in the pitch of sound due to relative motion is called.

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Carnot theorem

Interference

Doppler effect

Beats

The fringe spacing increases if we use.

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Yellow light

Green lgiht

Blue light

Red light

A 2 meter of high tank is full of water. If a hole appears at its middle, then the speed of efflux is.

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4.4 ms-1

10 ms-1

6.2 ms-1

20 ms-1

When the car moves with an increasing acceleration then its velocity time graph is always

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Constant

Variable

A straight line

A curve

The resultant of two forces 3 N and 4 N acting at right angle to each other is

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7 N

5 N

4 N

1 N

For normal adjustment what is the length of astronomical telescope if focal lengths of astronomical telescope if focal lengths of objective and eye piece are 100 cm 20 cm respectively.

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10 cm

20 cm

5 cm

120 cm

The direction of angular acceleration is

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Along the axis of rotation

Perpendicular to the axis of rotation

Opposite to axis of rotation

None of these

Entropy remains constant.

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Isothermal process

Adiabatic process

Isochoric process

Isobaric process

When the amplitude of a wave is increase to doubled is energy.

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Remain the same

Increases 4 times

Increases by two times

Decreases by half

Entropy of measure of.

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Internal energy of system

Order of system

Disorder of system

Potential energy of system

The weight of the body at the centre of earth is

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Maximum

Minimum

Zero

Infinite

1 rem =

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0.001 SV

0.01 SV

0.1 SV

1.01 SV

When transistor are used in digital circuits they usually operate in the :

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Active region

Break down region

Saturation & cutoff regions

Linear region

The electric potential at a mid point in an electric dipole is.

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0 V

0.5 V

1 V

1.5 V

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

A.C. Generator based upon the

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Lenz's law

Maxwell's relation

Faradays law of electromagnet induction

Mutual induction

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

In a pure inductive A.C. circuit the current.

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Lags behind voltage by 90 ^o

Leads the voltage by 90 ^o

In phase with voltage

Leads the voltage by 270 ^o

The current induced can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop bay coi of many turns

All of above

The middle region of electric field is:

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Maximum field spot

Zero field spot

Perpendicular field spot

All of above

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