Question # 1

Transfer of heat by actual movement of molecules form hot place to cold place is called:

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Conduction

Convection

Radiation

None

The unit of rate of conduction :

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JS^-1

J

K

JK^-1

At sea level , Atmosphere pressure is:

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101,300 Pa

101,400 Pa

101,500 Pa

101, 600 Pa

The product of force and momentum arm is called:

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Couple arm

Torque

Rigid body

Axis of rotation

In Einstein's mass-energy equation, c is the

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Speed of sound

Speed of light

Speed of electron

Speed of Earth

The slope of distance time graph shows.

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Speed

Displacement

Acceleration

Distance

Acceleration is produced by 20 N force it is due to:

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Inertia

Force

Momentum

None

Radiation are emited by:

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Cold body

Hot body

All bodies

None

Significant figures in 0.0010 are.

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One

Two

Three

Four

Atmospheric pressure will increased if we move on earth:

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Upward

Downward

Left

right

Which one box is used to keep food hot and ice cream cold for long period?

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Iron box

Aluminium Box

Styrofoam box

Plastic box

The half life of plutonium²³⁶Pu₉₄is:

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2.00 years

2.35 years

2.79 years

2.85 years

Mathematical formula of electromotive force (e.m.f) is:

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E = W/Q

E = Q/W

E = WQ

E = W2Q

Spherical mirrors are used in:

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Medical

Search light

Microscope

All of these

Those quantities whose values do not remain constant are called:

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physical quantities

Digital quantites

Log quantities

Analog quantities

an ideal voltmeter is that which draws:

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small current

no current

high current

none of these

Electric potential and e.m.f.

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are the same terms

are the different terms

have different units

both b and c

The force applied on the mass attached with a spring is represented by:

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F_a

F_c

F_ext

F_s

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

To see stomach problems we use:

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Gastroscope

Bronchoscope

Cystoscope

All of these

The vacuum all electromagnetic wave have the same

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speed

frequency

amplitude

wavelength

For normal person audible frequency range for sound wave lies between.

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10 Hz and 10KHz

20 Hz and 20KHz

25 Hz and 25KHz

30 Hz and 30KHz

If the slope of a velocity time graph gradually decreases than body is said to be moving with

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Positive acceleration

Negative acceleration

Uniform velocity

None

Torricelli's theorem is given by

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The unit of solar light inversely is

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Watt

kW m-2

Watt m-2

1 m2

The angle of projection for which its maximum height and horizontal range are equal

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46 ^o

56^o

66^o

76^o

The distance between two consecutive crests of troughs is called

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Time period

Wave length

Frequency

Displacement

Maximum number of components of a vector may be

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Infinite

One

two

three

At what speed the momentum and kinetic energy of a body having the same.

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1 ms-1

2 ms-1

4 ms-1

8 ms-1

The optical fiber is covered for protection by a

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Glass Jacket

Plastic Jacket

Copper Jacket

Aluminum Jacket

If 30 waves per second pass through a medium at a speed 30 ms-1, then the wavelength is.

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30 m

15 m

1 m

28 m

Using a graded Index fibre, the time difference is reduced to about.

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1 ns per km

33 ns per 100 km

33 ns per km

1 ns per 100 km

The shortest distance between two points is called

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Distance

Amplitude

Displacement

Is a number

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's 1st rule

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

For rectification we use.

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Transformer

Diode

Choke

Generator

Some charge is being given to a conductor. Then its potencial

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Its maximum at surface

Its maximum at Its maximum at center

Is remain same throughout the conductor

Is maximum somewhere between surface and centre

If the medium between the charges is not free space then electrostatic force will.be

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Increase

Decrease

Remain same

None of these

The value of e/m is smallest for

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Proton

Electron

Beta particle

Positron

Kirchhoff's voltage rule is a way of stating conservation of.

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Mass

Charge

Energy

Momentum

1 tesla =

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1 MAm^-1

1NA^-1m

1NA^-1m^-1

None of above

The inductive reactance of a coil is direction proportional to.

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Inductance

Resistance

Frequency of A.C.

Both frequency of A.C. and inductance

Step up transfer has a transformation ratio of 3:2. What is the voltage in secondary , If voltage in primary is 30 V?

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45 V

15 V

90 V

300 V

The process by which lesser beam can be used to generate 3-dimensional images of objects is called

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Holography

Geo graphy

Tomography

Radio graphy