Question # 1

In building central heating system works on the process of:

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Covection

Radiation

Conduction

both a and b

1000 liters is equal to:

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100 m³

1 m³

1 cm³

1 mm³

Which is unitless quantity:

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Mass

Force

Inertia

Momentum

The energy present in our food is:

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Mechanical energy

Gravitational potential energy

Chemical energy

Nuclear energy

Quantities between which a graph is plotted are called.

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Scalars

Vectors

Variables

None

In symbols, co-efficient of volume expansion is defined as

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β = ΔT/V∘ΔV

β = ΔV/ΔT

β = ΔV/V∘ΔT

β = ΔT/ΔV

The specific heat of glass is:

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501.72

500

501

502

The acceleration of a body moving the uniform velocity is.

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Uniform

Zero

Negative

Variable

__________ is a major source of heat:

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Mercury

Sun

Fire

Moon

Which pair of physical quantities has same SI unit?

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energy , power

power , work

energy , work

work , momentum

Transfer of heat between two bodies which are at same temperature is:

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Maximum

Minimium

Positive

Zero

Radiation was found in:

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1896

1895

1897

1898

The commercial unit of electrical energy is:

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Joule

Watt

Kilowatt hour

Electron volt

Specific resistance of silver = ________ x 10^-sOhm-meter

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5.25

2.75

1.69

1.62

A transformer has 100 turns in its primary and 500 turns in secondary coil. If 6 volts D.C is applied across its primary, the voltage induced across its secondary coil will be:

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0 volt

30 volts

45 volts

60 volts

Which of the following reasons increase the importance of computer:

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Speedy

Long time storage of memory

Quick decision

All of these

The S.I unit of electric potential is:

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Watt

Joule

Coulomb

Volt

The speed of sound in the air at one atmospheric pressure at room temperature is:

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343 ms-1

346 ms-1

349 ms-1

339 ms-1

Frequency of tuning fork depends upon its …………. of prongs:

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Weight

Speed

Mass

Distance

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

When an electric current passes through a conductor, which field is produced around it?

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Electric field

Magnetic field

Gravitational field

Electrostatic field

The digits used in electronics are:

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1

0

0 and 1

1 and 2

The unsteady flow of a fluid is called

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Stream line

Turbulent flow

Average flow

Viscous flow

The wavelength of wave produced by microwave oven is.

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12 cm

12 m

18 m

18 cm

For maximum range the angle of projection must be

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30^o

45^o

60^o

90^o

If an object lies at focus point F in front of a converd lens, its image is formed at.

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2F

F

3F

Infinity

The to and fro motion of a body is called

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Linear motion

Rotational motion

Vibratory motion

None of these

Unit of acceleration is

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ms-1

ms

ms-2

m2s

A body of mass 1.0 Kg dropped from the top of a tower of highest 50 m, what will be its K.E. 10 m below the top

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400 J

490 J

49 J

98 J

If a stretched string 4 m long and it has 4 loops of stationary waves, then the wave length is.

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1m

2 m

3 m

4 m

Speed of sound in copper is

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38000 ms-1

3600 ms-1

3500 ms-1

3400 ms-1

The rate of change of angular velocity is called

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Angular velocity

Angular acceleration

Angular displacement

Angular speed

Angle between ray of light and wave front is

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0 ^o

60 ^o

90 ^o

120 ^o

The reverse saturation current in a PN junction diode is only due to:

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Majority carriers

Minoritycarriers

Acceptor ions

Donor ions

The binding energy for_________ is maximum.

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Copper

Glass

Iron

Aluminum

The Direction of induced current is always so as to oppose the change which causes the current, is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff' s1ast rule

Balmer series lies in region of electromagnetic spectrum.

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Infrared

Visible

Ultraviolet

Fra infrared

The longest wavelength of Paschen series is.

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656 nm

1094 nm

1875 nm

2000 nm

The mass of beta particle is equal to mass of.

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Protons

Electrons

Neutrons

Boron

Helium Neon Laser Beam emitted from discharge tube has a colour.

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Blue

Green

Red

Black

Semiconductor diodes are called:

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Ohmic

non ohmic

Both a & b

none of above

In case of inductor , energy is stored in the

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Electric field

Magnetic field

Potential field

Gravitational field

The circuit in which current and voltage are in phase, the power factor is:

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Zero

1

-1

2

The field is strong and uniform.

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Inside the solenoid

Surrounding of solenoid externally

Perpendicular to solenoid

All of above