Question # 1

The chain reaction is controlled by a series of rods usually made of.

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uranium

Cadimium

Boron

Steel

Pure silicon has valence electrons

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1

2

3

4

Mean free path in a gas is the

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Distance travelled by a molecule before hitting a wall

Average distance travelled by a molecule in one second

Average distance travelled between molecules between any two successive collisions

Root mean square velocity

What units are used to rate electrical fuses.

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Volts

Ampere

Watts

Hertz

The law of motion and gravitation were introduced by.,

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Albert Einstein

Issac Newton

Galileo

Archimedes

Which term is used for the persistence of sound in a hall.

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Resonance

Acoustics

Symphony

Reverberation

An important property of an ideal power supply is.

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Infinite internal resistance

Zero internal resistance

Large output resistance

Small output resistance

Time period of a simple pendulum depends upon.

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Thickness of the thread

Mass of the pendulum

Length of the pendulum

Amplitude of vibration

Which one of the following does not have the same dimenstions.

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Energy ,work, heat

Pressure, stress, Young's modulus

Voltage, electromotive force, potential difference

Electric flux, electric field, electric dipole moment

To reduce spherical aberration in optical instruments which of the following should be used.

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Plano convex lenses

Concave lenses

Spherical mirrors

Plane mirrors

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 minimum angle of incidence for which total internal reflection can occur is called.

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Right angle

Acute angle

Critical angle

Obtuse angle

Balmer identified the spectral lines in the spectrum of hydrogen in

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1785

1885

1936

1966

a body floats in liquid contained in a beaker The whole system falls freely under gravity The outthrust on the body due to liquids is

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Zero

Equal to the weight of the body in air

Equal to the weight of the liquid displaced

Equal to the weight of the immersed portion of the body

LASER is a device for

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Producing a beam of white light

Producing a beam of monochromatic and coherent light

Producing a beam of high intensity incoherent light.

Producing highly penetrating's X -rays

In case of stationary waves every particle of the medium has fixed

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Velocity

Displacement

Amplitude

Phase

Which of the following characteristics of a wave is independent of the others.

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speed

Frequency

Amplitude

Wavelength

As the mass number increases, the binding energy per nucleon in a nucleus

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Increases

Decreases

Remain constant

Varies in a way that depends upon A

The ratio between the energy dissipated in some process and the heat that appears as a result is the

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Specific heat

Mechanical equivalent of heat

Kilocalories

Triple point

In fission reaction, heavy water is used as a

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Coolant

Moderator

Heat exchanger

Controller of reaction rate

A cork moes at 5 m s-1 on the crest of a wave The distance between the crests is 10 m. The frequency of the wave motion is.

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0.5 Hz

1.0 Hz

2.0 Hz

5.0 Hz

The ripple tank is used to study various features of

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Wave phenomenon

Interferences

Doppler's effect

Reverberation

Which of the following remains unaffected in a magnetic field.

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a particles

b partciles

gama particles

Electrons

The term used for the emission of electrons when light strikes a surface.

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The zeeman effect

The photo electric effect

Skin effect

Compton effect

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

When we pass a radiation from a radioactive material through an electric field.

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All three kinds of rays will be deflected

Only the Gama rays are deflected

The Alpha and Beta particles are deflected

Only the alpha particles are deflected

The word amorphous means

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With regular structure

Without structure

May have regular structure

Thermoplastics

A double convex an bubble in water will behave as.

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Plane slab

Concave mirror

Convex lens

Concave lens

Pressure of a gas depends upon

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Only on the molecular speed

Only on the speed of molecules on a unit volume

Only on the mass of molecules

Number of molecules mass and speed in a unit volume

Which law states that the angle of incidence equals the angle of refraction.

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Law of reflection

Law of refraction

Snell's law

Hygens's principle

Light from the sun reaches the earth in

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Spherical wave fronts

Cylindrical wave fronts

Plane wave fronts

Packets

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