Question # 1

What happens to internal energy of a piece of lead when hammered.

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Increases

Decreases

Remains unchanged

Becomes zero

Artificial radioactivity was discovered by

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Rontgen

Becquered

Rutherford

Marie Curie and Pierre Curie

Telecommunication by Optical fibers is done by

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Single mode step index fibre

Multimode step index fibre

Multimode graded index fibre

All of the above

In an induction coil, the secondary emf is.

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Zero at the break of the circuit

Zero during make of the circuit

Very high during make of the circuit.

Very high during break of the circuit

The fact that the edge of a shadow formed by a point source of light shining on an object is not sharp is an example of.

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Refraction

Diffraction

Polarization

Dispersion

The gravitational strength on the surface of moon is 1.6 N kg-1 What will be the mass and weight of an object respectively on the surface of the moon.

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10 kg , 1.6 N

10 Kg , 16 N

16 Kg, 10 N

16 kg, 160 N

One Tesla is equal to.

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1 N A-1

1 N m-1

1 N A -1 m

1 N A -1 m-1

What type of current is produced by batteries.

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Direct current

Alternating current

Pulsating current

Convection current

Which of the following refers to the distance from crest to crest of a wave.

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Frequency

Wavelength

Amplitude

Period

Which of the following is not a ferromagnetic materials.

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Iron

steel

Copper

Cobalt

Which one of the following has the largest wavelength.

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x rays

Infrared rays

Visible light

Radio waves

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

An emitter follower has

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High input impedance and high output impedance

High input impedance and low output impedance

Low input impedance and low output impedance

Low input impedance and high output impedance

When two identical waves are superimposed the velocity of the reasultant wave.

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Increases

Decreases

Become zero

Remain unchanged

The period of a geostationary satellite is.

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32 hours

72 hours

48 hours

96 hours

Which of the following is the most massive particle.

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Deuteron

Alpha particle

Neutron

positron

Transistor stands for

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Transfer of resistance

Transfer of current

Transfer of power

Transfer of voltage

The ratio of inertial mass to gravitational mass is.

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1

0.5

2

3

In a diffraction pattern, the width of any fringe

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Is directly proportional to slit width

Is inversely proportional to slit with

Has no dependence on slit width

Is zero

To measure the accurate value of potential difference across two points, the voltmeter should have.

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Zero resistance

small resistance

Large resistance

Infinite resitance

the depth of a pond is 4 m What is the apparent depth of the pond if the water level is 3.5 m high. The refractive index of water is 1.33

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1.9 m

2.3 m

3.13 m

4.5 m

Ionization of a hydrogen atom originally in its ground state takes a minimum out of energy equal to.

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2.4 J

4.2 J

12.3 eV

13.6 eV

When a direct current is passed though a junction formed of two dissimilar metals the junction becomes warmer or cooler depending on the.

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Current direction

Thermocouple used

Temperature gradient

Amount of current

A semiconductor diode conducts only when it is

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Not biased

Zero biased

Reverse biased

Forward and biased

Magnetic effect of current was discovered by

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Faraday

Fleming

Oersted

Ampere

Any frequency higher than the fundamental frequency of a sound is known as.

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Overtone

Beat

Acoustics

Shockwaves

The half life of a radioactive substance depend on.

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Pressure

Temperature

Amount of substance

No external influences

Any transparent medium bounded by one or two spherical surfaces is called

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Prism

Lens

Plane mirror

Grating

If two non zero vectors are perpendicular to each other than their scalar product is equal to

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1

-1

0

infinity

Which of the following are sources of direct current.

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Batteries

Solare cells

Thermocouples

All of these

The source of geothermal energy is

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The fusion in the sun

the radioactive decay in the earths interior

the rotation of earth around the sun

The rotation of earth around its own axis

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