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4

The method used to separate aluminium from a alumina is

A. electroplating

B. electrotyping

C. electrolysis

D. distillation

Correct Answer :

C. electrolysis


Related Questions

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4

Nuclear fission process means

A. absorption of a neutron by a nucleus

B. breakup of the nucleus of a heavy atom into two nearly equal halves emitting two or three neutrons and releasing large amounts of nuclear energy in the process

C. the scattering of neutrons

D. formation of heavier nucleus

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4

The atmosphere gets heated up mainly by

A. direct sun's rays

B. radiation from earth's surface

C. radiogenic heat (resulting from radioactive decay)

D. cosmic rays coming from space

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4

When a particle in motion is acted upon by a force in a direction perpendicular to the direction of motion, the path followed by the particle will be

A. a straight line

B. an ellipse

C. a circle

D. a parabola

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4

The method used to separate aluminium from a alumina is

A. electroplating

B. electrotyping

C. electrolysis

D. distillation

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4

A bullet is fired at a certain angle with the horizontal. Its path will be

A. elliptical

B. a straight line

C. a parabola

D. a vertical line

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4

Raindrops assume a spherical shape because or

A. adhesion

B. surface tension

C. gravitational force

D. atmospheric pressure from all sides

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4

We always see only one side of the moon because

A. the sun comes in between the earth and moon

B. the moon is stationary

C. the time taken by the moon to rotate on its axis is the same as the time taken by it to revolve round the earth

D. moon revolves round the sun

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Separating particles from a suspension is effected by

A. centrifugal force

B. frictional force

C. gravitational force

D. distillation

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4

The extremely luminous objects located at the centre of some distant galaxies and which are sources of high energy electromagnetic radiation are known as

A. Nebulae

B. Quasars

C. Meteors

D. Comets

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4

Why is it cool near an open pond on a hot summer day?

A. Evaporation at the surface causes cooling

B. The heat obsorbed at the surface is passed on to the bottom

C. Because of impurity in the water

D. Because of convection currents set up inside water

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4

The rate of cooling of a hot body depends on

A. the nature of the radiating surface

B. area of the radiating surface

C. temperature difference between the body and the surroundings

D. All the above

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4

The stem of a vibrating tuning fork is pressed against a sound box. Then

A. the loudness of the sound increases

B. the loudness remains the same

C. the loudness decreases

D. the sound suddenly stops

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The mixing up of two gases as a result of random motion of molecules is called

A. diffusion

B. effusion

C. vaporisation

D. sublimation

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4

X-rays are

A. deflected by electric field

B. deflected by magnetic field

C. slightly deflected by electric field and magnetic field

D. not deflected by electric and magnetic fields

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4

The strength of an electromagnet can be increased by

A. increasing the length of the coiled wire

B. increasing current supply

C. increasing the size of the iron core

D. All the above

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4

The SI unit of electric current is

A. the ampere

B. the volt

C. the ohm

D. the coulomb

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4

Expansion of a rod when heated

A. is proportional to its original length

B. is proportional to the increase of temperature

C. is inversely proportional to its original length

D. Both (a) and (b) above

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4

When light passes from air to glass, its velocity in glass

A. increases

B. decreases

C. remains unchanged

D. first decreases then increases

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Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.

A. rough white

B. rough black

C. shining white

D. shining black

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4

When the velocity of a body is halved

A. its momentum is halved

B. its kinetic energy is halved

C. its acceleration is halved

D. its potential energy is halved

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4

When a steel ball is placed on the surface of mercury, it does not sink because

A. of the surface tension of mercury

B. mercury is a semi-solid

C. of the high viscosity of mercury

D. the density of mercury is greater than that of steel

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4

Which force is used when milk is churned to separate cream?

A. cohesive

B. centrifugal

C. frictional

D. gravitational

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4

The unit of power in SI is

A. Joule

B. Newton

C. Joule/Sec

D. Erg/Sec

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4

A bar magnet tied in the middle with a thread is suspended at the South Pole of the earth. The magnet will be in

A. a horizontal position

B. a nearly vertical position with its South Pole downwards

C. a nearly vertical position with its North Pole downwards

D. a slanting position

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4

One finds it more difficult to walk on ice than on a concrete road because

A. there is more friction on ice than on concrete surface

B. ice is soft and spongy while concrete is hard

C. the friction between ice and the feet is less than that between the concrete and the feet

D. None of them

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4

Every action has an equal and opposite reaction is Newton's law of Motion

A. first

B. second

C. third

D. fourth

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Mica is used in an electric iron because it is a

A. good conductor of heat

B. good conductor of electricity

C. bad conductor of electricity

D. Both (a) and (b) above

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4

The colour or an opaque object is due to the colour it

A. absorbs

B. refracts

C. reflects

D. scatters

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A bolometer is used to measure

A. the quantity of heat energy in a body

B. thermal radiations quantitatively

C. high temperature

D. the intensity of sound

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A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will

A. increase

B. decrease

C. remain the same

D. first decrease and then increase