Question # 1

The inside cavity of the black body is

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painted white

painted silver

blackened with soot

painted red

For the normal operation of the transistor, its

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emitter-base and collector base junctions are forward biased

emitter-base junction is reversed biased and collector base junction is forward biased

emitter-base junction is forward biased and collector-base junction is reverse biased

any one of these

Resistance is measured in

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volts

ampere

ohm

watt

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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thermoionic electrons

free electrons

photoelectrons

slow electrons

Deep water almost runs still when surface water flow in rivers. What does it explains

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Magnus effect

Equation of continuity

Surface energy

Bernoulli's equation

If the volume of the gas is to be increased by 4 times, then

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Temperature and pressure must be doubled

At constant P the temperature must be increased by 4 times

At constant T the pressure must be increased by four times

It cannot be increased

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

When a platinum wire is heated, it appears white at

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1600°C

900°C

1100°C

1300°C

The SI unit of magnetic permeability is

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WB A^-1m^-1

WB mA^-1

WB Am^-1

None of these

Force is a:

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Scalar quantity

Base quantity

Derived quantity

None of these

In velocity of a particle at an instant is 10 m/s and after 5s the velocity of the particle is 20 m/s. The velocity 3s before in m/s is

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8

4

6

7

Diameter of the atom is of the order of

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10^-10m

10^-12m

10^-15m

10^-9m

A point on the rim of a wheel moves 0.2 m when the wheel turns through an angle of 14.3 degrees. The radius of the wheel is

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0.05 m

0.08 cm

0.8 m

0.008 m

In Pakistan electricity is supplied for domestic use at 220 V, it is supplied at 110 V in USA. If the resistance of a 60 W bulb for use in Pakistan is R, the resistance of a 60 W bulb for use in USA will be

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2 R

R/4

R/2

R

A body of mass 0.031 kg attached to one end of a spring of spring constant 0.3 N/m, then time period of spring mass system will be:

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1.5 sec

2.0 sec

2.3 sec

2.5 sec

A closed surface contains two equal and opposite charges. The net electric flux from the surface will be

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Negative

Positive

Infinite

Zero

The time taken to complete one vibration is called:

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Frequency

Amplitude

Time

Time period

The modulus of elasticity can be written as

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stress x strain

strain/stress

1/2 x stress x strain

stress/strain

The property of light which does not change with the nature of the medium is:

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Frequency

Amplitude

Wavelength

None of these

A circuit has a resistance of 11Ωan inductive reactance of 25Ωand a capacitance reactance of 18Ω. It is connected to an a.c. source of 200 V and 50 Hz. The current through the circuit (in amperes) is

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11

15

18

20

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

A two Kg block is held 1 m above the floor for 50 seconds, the work done is:

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Zero

10.2 J

100 J

980 J

The results of mechanical tests are usually expressed in terms of

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stress

strain

stress and strain

neither strees nor strain

One newton is a force that produces an acceleration of 0.5 m/sec²in a body of mass:

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2 kg

3 kg

4 kg

8 kg

If the vector 5 N lies along with x-axis, then its component along y-axis will be:

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Zero

5 N

7 N

10 N

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

Which of the following has the greatest coefficient of viscosity?

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water

gasoline

honey

tar

A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time

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6 s

36 s

38 s

None of these

Three resistors of resistance R each are combined in various ways. Which of the following cannot be obtained?

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3RΩ

2R/4Ω

R/3Ω

2R/3Ω

The motion in a plane is the motion in

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one dimension

two dimension

three dimension

four dimension

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