Question # 1

Acceleration of a body is negative if the velocity of the body is

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constant

increasing

decreasing

none of them

If 2.2 kilowatt power is transmitted through 1 10 ohm line at 22000 volt, the power loss in the form of heat will be

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0.1 watt

1 watt

10 watt

100 watt

If the velocity of the body decreases non-uniformly then the slope of the velocity-time graph will have

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different values

same values

zero valves

constant valves

An example of photoconductor is:

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Boron

Carbon

Iron

Aluminum

Selenium

Force acting upon a charged particle kept between the plates of a charged condenser if F. IF one of the plates of the condenser is removed, force acting on the same will become

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Zero

F/2

F

2F

On a cold morning a metal surface will fell colder to touch than a wooden surface, because

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Metal has high specific heat

Metal has high thermal conductivity

Metal has low specific heat

Metal has low thermal conductivity

When a falling body hits ground, its KE changes to _____ energy.

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Potential

Chemical

Mechanical

sound and heat

Which of the following quantity for particle executing SHM is non-zero at mean position

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Force

Acceleration

Velocity

Displacement

Strictly speaking, the earth is:

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An accelerated frame of reference

A non-inertial frame of reference

An inertial frame of reference

^{A non-accelerated frame of reference}

Both (A) and (B)

Pair production is the phenomenon in which

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matter is converted into energy

energy is converted into matter

light is converted into electrical energy

electrical energy is converted into light

The equation of continuity is

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A₁A_{2 = V}₁V₂

A_1/_V_{1 =}A_2/V₂

_V_1/A₁₌V_2/A₂

A₁_V_{1 =}A₂V₂

The space around the earth in which its gravitational force acts on a body is called

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Electric Field

Gravitational field

Magnetic field

Conservative field

The SI unit of capacitance is

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Farad

Henry

Ohm

Volt

Maximum work is done when force and displacement are

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Parallel

Antiparallel

Perpendicular

Both a and b

Heat travels through vacuum by

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Conduction

Convection

Radiation

Both A and B

The L-C parallel circuit the capacitor draws a

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leading current

lagging current

main current

none of these

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

If N is the total number of molecules and V is the volume of the container, then the expression for the pressure of gas is

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P=P/V<1/2mv²>

P=2N/V<1/2mv²>

P=2/3N/V<1/2mv²>

P=2/3N/V<mv²>

The unit of thermodynamical scale is

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centigrade

fahrenheit

kelvin

none of them

In bringing an electron towards another electron, electrostatic potential energy of system

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Decreases

Increases

Remains uncharged

Becomes zero

A heater coil rated at (1000 W - 200 V) is connected to 110 volt line. What will be the power consumed?

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200 W

302.5

250 W

350 W

The third band of the colour code:

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Gives the number of zeroes

Is decimal multiplier

Gives the resistance tolerance

Gives the third digit

Both (A) and (B)

Resolving power in mth order diffraction for grating is given by:

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R = N/m

R = m/N

R = N x m

None of these

A ball is thrown upwards with a velocity of 100 m/s. It will reach the ground after

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10 s

20 s

5 s

40 s

Acceleration of a body is positive, if the velocity of the body is

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constant

increasing

decreasing

none of them

The temperature of gas is produced by

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At potential energy of its molecules

The kinetic energy of its molecules

The attractive force between its molecules

The repulsive force between its molecules

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

Which one of the following is an example of resonance

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swing

tuning a radio

microwave oven

all of them

The velocity of a body at any instant of its motion is known as

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average velocity

instantaneous velocity

uniform velocity

none of them

Rice takes longest to cook

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In a submarine 100 m below the surface of the sea

At sea level

At Murree

At Mount Everest

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

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