Question # 1

A double convex air bubble in water will behave as.

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Plane slab

Concave mirror

Convex lens

Concave lens

Sounds of frequencies higher than 20,000 Hz are called.

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Super sonics

Infrasonic

Ultrasounds

Audible sound waves

The negative of the potential gradient is

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Potential energy

Electrostatic force

Electric field intensity

Electromotive force

Which of the following are defects is lenses.

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Chromatic aberration

Spherical aberration

Astigmation

All of the above

When light enters glass from air it suffers a change in.

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Wavelength

Wave front

Velocity

All of these

At room temperature the p.d. between the two sides of depletion region for germanium is of the order of.

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0.3 V

0.5 V

0.7 V

0.9 V

Light entering glass will not suffer change in

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Wavelength

Direction

Velocity

Frequency

A force of 10 N acting on a certain spring produces an extension of 40 mm Two such spring are connected end to end and this double length spring is extended by 40 mm What is the strain energy.

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0.05 J

0.10 J

0.20 J

0.40 J

Which law states that an induced current is always in such a direction as to oppose the motion or change causing it.

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Ampere's law

Gauss's law

Lenz's law

Kirchoff's law

The value of critical angle of glass is

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45^o

42^o

48^o

52^o

Most widely used types of gas LASER are

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Neon

Argon ion

Helium

All of these

Which parameter is an indication of colour of a star.

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Weight

Distance

Sixe

Temperature

Why is a capacitor resistor combination used in oscillators in grid circuit.

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To generate oscillation

To bias the grid automatically

To amplify oscillations

To sustain the oscillations.

Which quantity has different units from the other three.

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Density x volume x velocity

Rate of change of momentum

Young's modulus x area

Weight

Which of the following has greatest binding energy per nucleon.

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Normal hydrogen

Deuterium

Tritium

Helium-4

The dioptre power of concave lens of 10 cm focal length is.

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0.1 dioptre

1.0 diopter

10 dioptre

-10 dioptre

On which characteristics the loudness of sound pends upon.

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Pitch

Speed

Wavelength

Amplitude

The mains frequency in Pakistan is

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20 Hz

50 Hz

40 Hz

60 Hz

The time period of a simple pendulum is independent of its.

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Length

Mass

Acceleration due to gravity

Restoring force

The condition of complete equilibrium is satisfied if.

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Vector sum of all the torques is zero

Vector sum of all the forces is zero

Vector sum of all the forces and torques is zero

Angular acceleration is zero

Intensity of the dark bands in interference pattern becomes zero when two waves.

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Of light are monochromatic

Are of the same frequency

Are of the same amplitude

Travel in opposite direction

the amplitude of a wave indicates

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Wavelength

Frequency

Intensity of wave

Nature of wave

The centre of the sun produces a large amount of energy what is the source of this energy.

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Chemical reaction

Nuclear fission

Nuclear fusion

Radioactive decay

Why freezer a refrigerator is located in the top section

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Motor is not affected

Heat gained from environment is less

The entire chamber of freezer is cooled quickly

Heat gained from environment is more

On which factor mutual induction of two coils does not depends upon.

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Number of turns of the coils

Area of cross section of the coils

Closeness of the coils

Shape of the coils

Push pull amplifiers employ

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One transistor

Two transistors

Three transistors

Four transistors

Which of the following is a non contacting device that intercepts and measures thermal radiation.

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Thermometer

Pyrometer

Voltmeter

Lactometer

The heat accepted and rejected by a Carnot engine operating between two heat reservoirs defines.

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The efficiency of the working substance of the engine

the ideal gas scale of temperature

The ratio of the absolute temperature of the reservoirs

The thermal capacity of the working substance

The period of a geostationary satellite is.

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32 hours

72 hours

48 hours

96 hours

What is the effect on the product of resistivity and conductivity if the temperature of a conductor is increased.

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It decreases

It increases

It remains the same

It may increase or decrease

Which one is the primary standard for temperature measurement.

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Resistance thermometer

Mercury in glass thermometer

Constant volume gas thermometer

Pyrometer

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