Question # 1

Those objects that conduct electricity are:

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Conductors

Insulators

Semi conductOrs

None of these

Ship and boats are designed on the principal of

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Charge

Densities

Volume

Floatation

Value of 'g' on surface of moon is:

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1.62 ms^-2

3.7 ms^-2

9.2 ms^-2

10 ms^-2

The energy released int he form of nuclear radiations in addition to heat and light is called:

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Mechanical energy

Gravitational energy

Chemical energy

Nuclear energy

The bad conductor of heat is:

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Iron

Copper

Air

Aluminum

What gas behaves as glass or polythene to radiation:

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Nitrogen

Hydrogen

Carbon di oxide

Methane

The Earth is surrounded by a cover of air called

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Atmosphere

Solid

Environment

Surroundings

Degree of hotness or coldness a body is called:

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Heat

Internal Energy

Temperature

Potential energy

Co-efficient of friction between iron and iron is:

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1.0

0.62

0.9

1.2

For balancing the beam balance, pointer must be at.

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Extreme position

Zero

The right side

The left side

In solids, Heat is transferred by:

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Radiation

Conduction

Convection

Absorption

In simple harmonic motion, the acceleration of the body is…………. Proportional to the displacement.

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Inversely

Directly

Equally

Ration

A conductor of electric current is:

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Wood

Rubber

Plastic

Copper

If Current flowing through switch then the output is expressed as:

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0

1

-1

2

If the displacement in spring is ‘x’ of mass “m” attached with a spring then restoring force is:

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F=ma

F=kx

F=-kx

F= m/a

Which of the following is not processing:

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Arranging

Manipulating

Calculating

Gathering

The ray of light after reflection from concave mirror passes through:

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Centre

Principal focus

Pole

Radius

The true ratio of a transformer is 10. It means:

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Vs = 10Vp

Ns = Np/10

Ns = 10NP

VS= Vp/10

The mirror whose inner surface is reflecting is called:

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Concave mirror

Convex mirror

Miroor

Lens

Positive charge can be produced by:

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Combing in hair

Rubbing glass rod on silk

By rubbing ebonite rod on wool

By rubbing glass rod wool

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

Which is used to investigate the properties of electron beam:

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LDR

Electroscope

Proton gun

Electron gun

Diffraction is a special type of

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Reflection

Polarization

Interference

Refraction

The kinetic energy of molecules of an ideal gas at absolute zero is

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Very low

Very high

Zero

First increases then decreases

The terminal velocity can be obtained by using

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Newton's law

Stock's law

Guass's law

None of these

The speed of sound increases with the increase of in

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Pressure

Volume

Temperature

Density

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

In stationary waves the points which always remain at rest are.

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Nodes

Antinodes

Crest

Trough

If the time period of simple pendulum is 2 seconds its frequency will be.

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1 Hz

0.5 Hz

1.5 Hz

2 Hz

When water falls from tap, its cross sectional area decrease due to.

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Decrease of speed

Increase of speed

Air pressure

Gravity increase

The commercial unit of electric energy is

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Kilo watt hour

watt

Watt hour

Kilo Watt

The portion of the wave above mean level is called.

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Node

Antinode

Crest

Trough

Example of thin film is.

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Soap burble

convex lens

Concave lens

Glass plate

A battery is used in

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ohmmeter

Ammeter

Galvanometer

Voltemeter

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

The photo copying process is called

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Xerography

Inkjet Printer

Both (a) and (b)

None of these

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

The powers of two electric bulbs are 100w and 200w. Which are connected to power supply of 220 V. The ratio of resistance of their filament will be:

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1:2

2:1

1:3

4:3

Two up quarks and one down quarks makes a

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Proton

Newton

Photon

Meson

The unit of resistance is:

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Ω

Ωm

Ω^-1m^-1

Ωm^-1

The word amorphous means:

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Regular structured

Without form or structure

Frozen structured

None of above

When a conductor moves across a magnetic field an emf is set up this emf is called.

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Variable emf

Constant emf

Back emf

Induced emf

Depletion region carries.

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-ve charge

+ve charge

Ions

No charge

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.