Question # 1

If a train traveling at 72 kmph is to be brought to rest in a distance of 200 meters then its retardation should be

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20 ms^-2

10 ms^-2

2 ms^-2

1 ms^-2

Ohm's law states that

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The current through a resistor is directly proportional to the applied voltage

The voltage across a resistor is directly proportional to the current passing through it

Resistance is the constant of proportionality between the voltage and current

all of these

Electromagnetic radiation or photons interact with matter in

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two distinct ways

three distinct ways

four distinct ways

five distinct ways

Photocell is a device which converts

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chemical energy into electrical energy

electrical energy into light energy

heat energy into electrical energy

light energy into electrical energy

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

When the pn-junction is forward biased. the current flows through it is of the order of

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mili-amperes

amperes

nano-amperes

micro-amperes

When the p-n junction is forward biased its resistance is of the order of

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few mega ohms

few kilo ohms

few ohms

few milli ohms

The discuss used by athlete has a mass of 1 kg, its weight in newton is

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9.8 N

80 N

98 N

100 N

Time period of simple pendulum is independent of

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length

mass

acceleration due to gravity

none of them

Glass is an example of

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crystalline solid

amorphous solid

polymeric solid

none of them

Acceleration in a body is always produced in the directin of:

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Velocity

Weight

Force

Botha B and C

The year when A.H. compton was awarded Nobel Prize is:

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1923

1927

1931

1935

None of these

On the compression stroke of the petrol engine, the inlet value is closed and the mixture is compressed

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adiabatically

isothermally

isochorcally

isobarically

Three resistors of resistance 2,3 and 6 ohms are connected in parallel, their equivalent resistance is

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11.0 ohm

1.0 ohm

7.0 ohm

3.0 ohm

In full wave rectification, simultaneous action is that:

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Two diodes conduct and two do not.

One diode conduct and three do not.

Three diodes conduct and one does not.

All the four diodes conduct

None of these

The sum of positive and negative peak values is called:

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Instantaneous value

Peak value

Rms valuie

Peak-to peak-value

None of these

Which one is not produced by sound waves in air?

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Polarization

Diffraction

Refraction

Reflection

If the acceleration of a body is not uniform, then velocity-time graph will be:

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Curve

Straight line

Sphere

All of these

The fluid which is incompressible and non viscous is called

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Ideal fluid

Non-ideal fluid

Prefect fluid

All

A point charge A of charge +4μC and another B of charge -1μC are placed in air at a distance 1 m apart. Then the distance of the point on the line joining the charge B, where the resultant electric field is zero, is (in m)

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2

1

0.5

1.5

The Einstein's changes in length, mass and time are not observed in common life because

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We dont observer then seriously

The masses are too large

Their speed is too small than the speed of right

All of the above

Transformer is used to

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Increase alternating current

Increase d.c voltage

Increase & Decrease emf

All answers are right

Current provided by a battery is maximum when

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Internal resistance equal to external resistance

Internal resistance is greater than external resistance

Internal resistance is less then external resistance

None of these

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

An object thrown upward with an initial velocity at certain angle with the horizontal and moving freely under the action of gravity is called

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a rocket

an aeroplane

a projectile

a ballon

If the stress increased beyond the elastic limit of the material. the deformation produced in the material will be

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permanent

temporary

either of them

none of them

The pressure will change in the pipe, as the fluid moves through that pipe of varying

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cross-section

height

none of them

both of them

A ball is dropped vertically down and it takes time t to reach the ground. At time t/2

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The ball had covered exactly half the distance

The velocity of the ball was V/3 where V is the velocity when it reached the ground

The ball had covered less than half the distance

The ball had covered more than half the distance

The fluid is incompressible, if itsdensity is

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zero

constant

very high

very small

Si units of time period is

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second

hertz

revolution

vibration/sec

The current through a metallic conductor is due to the motion of

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protons

neutrons

electrons

free electrons

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