Question # 1

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

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1

2

3

4

The unit of kinetic energy is:

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J

N

Km

Pa

Larger is the area greater will be:

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Radiation

Transfer of heat

Evaporation

Conduction of heat

Two bodies of masses m₁ and m₁ attached to the ends of an inextensible string passing over a frictionless pulley such that both move vertically. The acceleration of the bodies is:

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m1 x m₂ / m₁ + m₂ g

m₁ - m₂ / m₁ + m₂ g

m₁ + m₂ / m₁ - m₃ g

None of these

In summers the railways bends due to:

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Expansion

Contraction

Both

None

The temperature if steam is

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0°C

100°C

273°C

-273°C

The energy stored in dam is:

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Potential energy

Kinetic energy

Chemical enegy

Nuclear energy

When a body is lifted through a height the work done on its appears in the form of its:

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Kinetic energy

Potential energy

Elastic potential energy

Geothermal energy

Turning effect of a force is called:

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Torque

Moment

Couple

Torque and momentum

In kelvin scale, lower reference point is:

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273 K

373 K

180 K

100 K

Crocus flower open when the temperature is:

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23 ^oC

26^oC

29^oC

32^oC

Electron gun has an electrode called for controlling the flow of electrons in the beam:

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Plate

Grid

Screen

Filament

Human skin, in dry conditions, has a resistance of:

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20,000 ohm

100,000 ohm

30,000 ohm

2000 ohm

The distance between two consecutive compressions or rarefactions in longitudinal waves is called:

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Amplitude

Wavelength

Half wavelength

1/4 wavelength

100x10³ A= :

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10^-3 A

10^-2 A

10 A

10^-1A

Eight bits combine to form:

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A byte

Megabyte

Kilobyte

Gigabyte

The electrostatic force acting on two charges each of 1 C separated by 1m is about .

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9 x 10⁹ N

9 x 10^-9N

9 x 10⁸N

9 x 10^-8N

The energy is transferred from one place to another:

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Through matter

Thouth waves

both a and b

None of these

Which device has two coils, primary and secondary?

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D.C. Motor

Transformer

A.C. genrator

a and b

Why household appliances should 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

Pitch of sound depends upon:

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Frequency

Amplitude

Intensity

Time period

If the length of a simple pendulum is halved its time period will become:

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T/2

T = T/√2

√2T

2T

The resultant of two forces 30 N and 40 N acting parallel to each other is.

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30 N

40 N

70 N

10 N

The wavelength of fundamental note in one end closed pipe in term of length 'l' of pipe is.

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4 l

2l

l

1/4 l

Multimode graded index fibre has a core whose diameter range lie from.

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5 to 50 micro meter

50 to 100 micro meter

40 to 1000 micro meter

50 to 10,000 micrometer

the final image obtained by astronomical telescope is.

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Erect

Virtual

Magnified

All of these

If the are of a circle equals its radius, then the angle subtended at the center will be

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1 degree

One rotation

One radian

Half rotation

Sound waves are

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Electromagnetic waves

Transverse waves

Compressional waves

Matter waves

Which one of the following can not be polarized.

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Ultra violet rays

Radio waves

T.V. Waves

Sound waves

In the absence of air resistance the acceleration of a body will be

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Uniform

Variable

Instantaneous

None of these

Change of momentum is equal to

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Force

Tension

Impulse

Pressure

Stoke's law holds for bodies having.

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Spherical shape

Oblong shape

Rectangular shape

All shapes

The resultant of two vectors having magnitude 12 N and 8 N can not be

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2 N

20 N

10 N

16 N

The mass of beta particle is equal to mass of.

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Protons

Electrons

Neutrons

Boron

CRO works by deflecting the beam of electron as they pass through

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Uniform magnetic field

Uniform electric field between two sets of parallel plates

Non-uniform magnetic field

None of these

At resonance frequency, the impedance of RLC series circuit is.

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Maximum

Minimum

Zero

Infinite

The series in visible region is:

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Balmer series

Pfund series

Paschen series

None of above

The conductors having the conductivity of the order of

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Who explained the photo electric effect.

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Max Plank

Einstein

Henry

Rutherford

Light of 4.5 eV is incident on a Cesium surface and stopping potential is 0.25 eV, maximum K.E. of emitted electron is.

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4.5 eV

4.25 eV

4.75 eV

0.25 eV

The reactance of inductor depends upon

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L

All of the above

The working principle of transformer is.

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Self induction

Faraday's law

Mutual induction

Electromagnetic induction

In three phase voltage across any two lines is about.

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220 V

230 V

400 V

430 V

The peak to peak value of alternating voltage is

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2V_o

V_o

None of these