Question # 1

A concave mirror is used to form an image of the sun on a white screen IF the lower half of the mirror were covered with an opaque card the effect on the image on the screen would be.

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Negligible

To make the image less bright than before

To make the upper half of the image disappear

To make the lower half of the image disappear.

A torch bulb uses a 3 V supply and makes a current of 0.2 A It is switched on for one minute How much electrical energy is used.

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0.6 J

12 J

24 J

36 J

A wave which consists of a single, non repetitive disturbance is called a

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Continous wave

Pulse

Longitudinal wave

Transverse wave

If we use two diodes and a centre tapped transformer we will get.

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A transistor

An amplifier

A half wave rectifier

A full wave rectifier

Two pure inductors each of self inductance L are connected in parallel The total inductance of the combination is.

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L

2L

L/2

L/4

The diver spins faster when moment of inertia becomes

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Smaller

Greater

Double

zero

When a charged rod is brought near bits of dry cork dust The dust will.

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Cling firmly to rod

Be replied from the rod

Attract itself to the rod a first and then fly off

Be repelled at first and then be drawn to the rod

Prof. Abdul Salam was awarded Novel prize in

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1970

1972

1979

1983

Stationary waves only a discrete set of frequencies are set up in a medium. This fact is called.

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Harmonics

Overtones

Quantization of frequencies

Superposition of frequencies

Dispersive power of a prism depends upon the wavelength of the light used and is

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More for large wavelengths

Less for large wavelengths

More for small wavelengths

Less for small wavelengths

Thermocouple is used for

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Converting atomic energy into heat energy

Measure the radiant energy

Storing the heat energy

Measuring current

A pure capacitor is connected in an AC circuit The power factor of the circuit will be.

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Unity

Infinity

0.5

Zero

Davison and Germer received the Nobel Prize in

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1929

1931

1935

1937

The centre of gravity of an irregular shaped object lies at

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The intersection of diagonals

The intersection of medians

Its centre

The axis of rotation

Who gave the idea of matter wave.

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De Broglie

Planck

Einstein

Huygen

Critical mass is the minimum mass needed for

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Fusion

H-Bomb

Chain reaction

Binding energy

Which onw of the following is deflected by an electric field.

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Alpha particles

Gama rays

Neutrons

x rays

If a ray of light in glass in incident on an air surface at an angle greater than the critical angle, the ray will

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Refract only

Reflect only

Partially refract and partially reflect

Diffract only

If a charged body is moved against the electric field it will gain.

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P.E

K.E.

Electrical P.E.

Gravitational energy

Why hydrogen atom does not emit x-rays.

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its size is very small

It contains only single electron

In it energy levels are for apart

In it energy levels are close to each other

Lenses are commonly made of.

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Glass only

Plastic only

Glass and clear plastic

Aluminium

When we look at the sky during daytime the light that we see is sunlight that has been absorbed and then re radiated in different directions, This process is called.

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Scattering

Diffusion

Mirage

Rainbow

Direct current generators use.

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Coiled rings

Split rings

slip rings

solenoid rings

Which current can pass through a capacitor continuously.

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Alternating current

Direct current

Eddy current

Pulsating current

In Compton's effect it was considered that X-rays consist of

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Electrons

Holes

Neutrons

Protons

Which is the famous standard model of the universe.

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the big bang

Casmos

Astronaut

The small stap

What is the term for an motion of charge from one region to another.

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electric charge

Electric current

Electric field

Electric potential

The SI unit of modulus of elasticity us

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N m-2

N m-1

N m

N m -3

if temperature eon Celsius scale is 50 oC the temperature on Fahrenheit scale will be.

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102 ^oF

108 ^oF

112 ^oF

122 ^oF

Which of the following be used for redeciding mechanical aberration is optical instruments.

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Plane mirrors

Spherical mirrors

Concave lenses

Plano convex lenses

To obtain is parallel beam from the headlight of a car it must be fitted with.

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A convex mirror

A concave mirror

A convex lens

A concave lens

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