Question # 1

Ship and boats are designed on the principal of

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Charge

Densities

Volume

Floatation

The sun's surface temperature is :

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3,000 K

3,030 k

6,000 K

600 K

There are ways to transfer the heat from one place to another.

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1

2

3

4

In solid, heat is transferred by:

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Radiation

Conduction

Convection

Absorption

Heat travels from __________

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Colder to hotter

Hotter to colder

Both a & b are possible

None of above

Graph is plotted between ........ variable.

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1

2

3

4

Rooms are heated using gas heaters by

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Conduction only

Convection and radiation

Radiation only

Convection only

The speed of satellites in GPS is:

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8.73 kms^-1

3.87 ms^-1

32 ms^-1

3.87 kms^-1

Heat capacity of 5 kg water is.

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2000 JK^-1

2100 JK^-1

21000 JK^-1

210000 JK^-1

Which one is a good conductor?

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cotton

air

wool

iron

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

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

The instrument which is used to display the magnitude of changing electric current is called:

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Evacuated tube

Cathode rays oscilloscope

Television tube

Picture tube

When you rub a plastic rod against your hair several times and put it near some bits of paper, the pieces of papers are attracted towards it. What does this observation indicate:

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The rod and the paper are oppositely charged

The rod acquires a positive charge

The rod and the paper have the same charges

The rod acquires a negative charge

Electric motor converts electrical energy into:

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Chemical energy

Solar energy

Heat energy

Mechanical energy

If a neutral body is brought near to the electroscope its leaves:

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Diverge

Contract

Shut

Remain in normal position

Who developed the 1st practical electric battery:

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Alessandro volta

Faraday

Newton

None of these

What should household appliances be connected in parallel with the voltage source?

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to increase the resistance of the circuit

to decrease 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

Which of the following quantities is not change during refraction of light?

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Its direction

Its speed

its frequency

Its wavelength

Which type of capacitor is cylindrical in shape:

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Paper capacitor

Mica capacitor

Variable capacitor

Plates capacitor

The frequency of silent whistle is:

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20,000 Hz - 25000 Hz

2000 Hz - 25000 Hz

200 Hz - 2000 Hz

25000 Hz

isotopes are atom of same element with different.

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Atomic mass

Atomic number

Number of proton

Number of electron

Critical angle is that angle of incident ofr which angle of refraction is.

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90 ^o

45 ^o

42 ^o

24 ^o

All point of the rigid body rotating about a fixed axis do not have same.

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Angular acceleration

Angular speed

speed

Angular displacement

Work is a

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Scalar quantity

Vector quantity

Basic quantity

None of these

Which is an example of irreversible process.

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Explosion

Evaporation

Slow compression

A chemical explosion

Entropy remains constant.

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Isothermal process

Adiabatic process

Isochoric process

Isobaric process

Which one is non renewable source of energy.

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Hydro electric

Bio mass

Tides

Oil

Efficiency of steam locomotive is.

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8%

10%

9%

7%

An ideal heat engine can only be 100% efficient if its cold temperature reservoir is at.

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0 K

0 ^oC

100 K

100 ^oC

The force and torque are analogous to

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Velocity

Mass and weight

Moment of Inertia

Each other

If the temperature of a gas is constant then <1/2 mv2> of the molecules of gas will be.

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Constant

Zero

Increase

Decrease

An object of mass 1 kg moving with acceleration 0 1 ms-2 will experience a force of.

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10^-2 N

10^-3 N

1 N

1 dyne

The open loop gain of the amplifier is order of.

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10⁶

10⁵

10⁷

10³

The motional emf is give by

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qvB

IBL

eBL

vBL

Helium-Neon laser discharge tube contains neon

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82%

15%

25%

85%

The sensitivity of Galvanometer can be increased by:

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Increasing C/BAN factor

Decreasing C/BAN factor

Increasing angle θ

All of above

In Series resonance circuit the impedance of circuit art resonance frequency, is

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Maximum

Minimum

It is unequal to R

None of above

Which of the following does not undergo plastic deformation.

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Copper

Wrought iron

Head

Glass

When nitrogen is bombarded by alpha particles nitrogen nucleus changes into

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Oxygen

Carbon

Barium

Helium

The unit of strain is:

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Nm

Nm^-2

no unit

Nm²

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

The domain theory of magnet is important to explain the behaviour of

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Diamagnets

Paramagnets

Ferromagnets

All of these

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.

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√2

1/√2

2

1/2