Question # 1

Which of the following is not a mode of radioactive decay

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Nuclear fusion

Alpha decay

Electron capture

Positron emission

When the angel of incidence becomes larger than the critical angle no refraction occurs This is known is.

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Diffraction

Refraction

Total internal reflection

Diffuse reflection

The highest value reached by the voltage or current in one cycle is its.

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Top value

Maximum value

Average value

Peak value

The maximum energy of emitted photoelectron is measured by

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the largest potential difference they can traverse

The current they produce

The potential difference they produce

The speed with they emerge

A positive and a Negative charge are initially 4 cm apart When they are moved closer together so that they are now only 1 cm part the force between them is.

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4 times smaller than befor

4 times larger than before

8 times larger than before

16 times larger than before

In projectile motion, the body has

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One component of velocity

Two components of velocity

Three components of velocity

No component of velocity

Which of the following is a method of energy transfer.

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Conduction

Wave motion

Radiation

All of these

Which quantity has dimensions different from the others.

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Energy per unit volume

Force per unit area

Angular momentum per unit mass

Pressure

Artificial polymers are made by a chemical reaction known as.

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Crystallization

Electroplating

Polymerization

Polarization

The air pressure at the bottom of an air foiling motion is

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Greater than that on the top

Equal to that on the top

Grather than that on the top

Zero

The total energy of the hydrogen atom is

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zero

Infinite

positive

Negative

Which of the following is used for reducing spherical aberrations in optical instruments.

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Plano convex lens

Concave lens

Spherical mirrors

Piane mirrors

When the temperature of source and sink of a heat engine become equal the entropy change will be.

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Zero

Maximum

Minimum

Negative

The reciprocal of decay constant lamda of a radioactive substances is equal to.

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total life

Half life

Mean life

Curie

Colour of light is determined by its

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Amplitude

Velocity in air

Wavelength

State of polarization

Which one the following is not a component of a Bipolar junction Transistor

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Base

Emitter

Collector

Grid

When all the systems taking part in a process are included, the entropy.

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Decreases

Either remains constant of increases

Either remains constant or decreases

Remains constnat

What happens to the energy of a charged condenser is plate separation is increased.

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It decreases

It increases

It becomes zero

It remains unchanged

When a vector is multiplied by a negative number its direction.

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Remains unchanged

Changes by 180 ^o

Becomes horizontal

Vertical to each other

Longitudinal waves cannot be

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Reflected

Difracted

Dispersed

Polarized

When a perfect gas is supposed to expand freely in an isolated vessel the gas has undergone.

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An increase in pressure

An increase in temperature

A change in phase

A change in entropy

LASER is a device which can produce

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Monochromatic beam of light

Coherent beam of light

An intense beam of lgiht

All of these

Which parameter is an indication of colour of a star.

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Weight

Distance

Sixe

Temperature

What is used in an electric circuit to allow current in one direction only.

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A fuse

An ammeter

A diode

A relay

An important application of the semi conductor is the

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Vacuum tube

Fluroescent tube

Copper oxide rectifier

Battery

On the ground the gravitational force on a satellite is W What is the gravitational force on the satellite when at height R/50

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0.96 W

0.98 W

1.04 W

1.02 W

Iron loss in a dynamo arises because of.

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The resistance of armature coil

The production of eddy current

The presence of mechanical friction

The leakage of flux

The circuit of full wave rectification consists of

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Only one diode

Two diodes

Three diodes

Four diodes

A pair of point charges with equal magnitude and opposite sign separated by a distance 'r' produce.

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Electric dipole

Electric charge

Electric field

electric arc

How much lce will melt by 50,000 J of heat.

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120 J

130 g

140 J

150 g

In the magnetic circuit concept the quantity analogous to electric current in electric circuit analysis is.

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Magnetic flux density

Permeability

Magnetic field intensity

Magnetic flux

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