Question # 1

Which of the following is a thermodynamic potential

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Internal energy

Enthalpy

Gibb's free energy

All of these

Spherical aberration can be removed by using

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Concave lens

Convex lens

By limiting the number of rays using a stopper

By using a concave convex lens

An important application of the semi conductor is the

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Vacuum tube

Fluroescent tube

Copper oxide rectifier

Battery

The velocity of an object when projected from the earth in order to escape the earth's gravitational field is called the.

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Terminal velocity

Average velocity

Instant aeneous velocity

Escape velocity

At high temperature a body generally emits redactions of.

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Small wavelengths

Long wavelengths

Moderates wavelengths

Zero wavelengths

A new class of ceramics materials was discovered in.

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1938

1958

1978

1986

At high frequency the current through a capacitor will be

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Small

Zero

Large

Infinity

Which liquid can flow easily.

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Traacle

Pitch

Ether

All flow with same rate

Capacitive reactance is measured in

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Henrys

Ohms

mhos

electron volts

When ever a system is made to complete a cyclic process the work done during the complete cycle.

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Is zero

Is negative

Is positive

Depends upon the path followed

Which of the title for combining of notes that produce jarring effect on the ear.

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Noise

Melody

Harmony

Discord

If slope of velocity time graph gradually decreases, then a body is said to have

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Negative acceleration

Positive acceleration

Uniform velocity

Variable velocity

Which of the following statemtents is worng.

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Charge is quantized

Charge is conserved

There is not field near an isolated charge at rest

A moving charge produces both electric and magnetic field.

The pitch of sound a determined by its

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Speed

Frequency

Direction

Number of beats

A transistor can be used as

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Oscillator

Amplifier

Switch

Both a and c

The Compton effect in X-rays proves that

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Electrons have wave property

x-rays have wave properly

X-rays have particle characteristics

Electrons cannot exist

The material of an electromagnet should have high

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Permeability

susceptibility

Retentivity

Hysteresis loss

How positives feedback will effect an amplifier.

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Increases the voltage gain

Decreases the voltage gain

Imitates oscillation to occur

Damaged it

Lenz's was a physicist of.

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America

Russia

Japan

China

Which of the given factors is increased in a step down transformer.

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Voltage

Current

Wattage

Resistance

The working of the rocket is based on the principle of.

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Electromagnetism

Conservation of momentum

Floatation

Hydraulic system

The use fulness of x rays is largely due to their

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Mass

Density

Penetrating power

Rest mass

Permanent change in shape or size of a solid body without fracture resulting from the application of strained stress beyond the elastic limit is called.

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Elastic limit

Plastic limit

elastic deformation

Plastic deformation

Difference in the density of two medium when waves are passing from one into another medium always results in the change in.

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Wave speed

Wave direction

Both speed and direction

Wave frquency

The velocity of the wave could be increased by

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Reducing the amplitude

Decreasing the frequency

Increasing the period

Stretching the spring more

In a resistor, when base width decreases with increasing Vbc, this phenomenon is called.

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Tunneling

Thermal runway

Pinch off

Early effect

Change in which parameter determines the work done by a gas during adiabatic prcoess.

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volume

Pressure

Temperature

Weight

Which vector gives the displacement from one point another in space.

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Null vector

Position vector

Unit vector

Distance vector

Which of the following causes the deflection of Alpha particles when they re passed through a thin foil.

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Attraction of nucleus

Collision with nuclei

Interactions with electrons

Electrostatic repulsion by the nucleus

The process in which pressure of the system remains constant.

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Isothermal process

Isochoric process

Isobaric process

Adiabatic process

The pressure change in a confined incompressible fluid is transmitted equally in all directions throughout the fluid and to the walls of the container This is.

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Archimedes principle

Kirchhoff's law

Pascal's law

Ampere's law

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