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Current Affairs January 2024

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4

When temperature decreases, resistance of metals to flow of electricity

A. increases

B. decreases

C. neither increases nor decreases

D. first increases then decreases

Correct Answer :

B. decreases


Related Questions

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Dioptre is the unit of power of

A. convex mirrors

B. concave mirrors

C. concave lenses

D. lenses irrespective of types

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4

Which physical quantity is measured in watts

A. power

B. kinetic energy

C. momentum

D. impulse

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4

An electric kettle used for boiling hard water has a white scale deposited on its heating element. This consists or

A. sugar

B. sodium carbonate

C. common salt

D. carbonates of calcium and magnesium

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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

In a concert hall reverberation is controlled by

A. reduction of seating capacity in the hall

B. increase of sound intensity in the hall

C. lining the walls, with leather panels put on over a layer of sound absorbent glass fibre

D. by opening the doors and windows of concert hall

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4

Which part of the eye photographic camera?

A. Lens

B. Iris

C. Retina

D. Eyelid

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4

In a freezer ice cubes will be formed more quickly in trays made of

A. rubber

B. plastic

C. aluminium

D. wood

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4

When an electric bulb breaks, there la an explosive sound. That is due to

A. the chemical reaction between the gases inside the bulb

B. the compressed gases inside rushing out suddenly

C. the air outside rushing in to fill the vacuum inside the bulb

D. None of the above

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4

To concentrate light on the defective teeth, the dentists use

A. convex mirrors

B. concave mirrors

C. convex lens

D. concave lens

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4

The force that keeps a body in a circular motion la called

A. the centripetal force

B. the centrifugal force

C. the frictional force

D. All the above

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4

When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of

A. surface tension

B. capillarity

C. viscosity

D. diffusion

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4

X-rays were discovered by

A. Wilhelm Roentgen

B. WO Coolidge

C. Henry Cavendish

D. William Watson

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4

The radius of curvature of a spherical mirror is

A. equal to half its focal length

B. equal to its focal length

C. twice its focal length

D. not related to its focal length

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4

In experiments on static electricity the standard method for obtaining small amounts of positive electricity is to rub

A. a glass rod with flannel

B. an abonite rod with flannel

C. a glass rod with silk

D. Any of the above

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4

The end product in the uranium disintegration series is

A. lead

B. zinc

C. carbon

D. tin

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4

The motion .of the pendulum of a wall clock is an example of

A. linear motion

B. vibratory motion

C. rotational motion

D. None of the above

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4

The Indian Satellite System used for domestic communications, television and meteorology is known as

A. INSAT

B. Bhaskara

C. Aryabhatta

D. All the above

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4

Electron-volt is a unit of

A. power

B. velocity

C. energy widely used in nuclear physics

D. number of electrons

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4

The resistance of a wire depends on

A. the material of the wire

B. the length of the wire

C. the cross section of the wire

D. All the above

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4

SONAR (Sound Navigation Ranging) is

A. used by warships and military aircraft to locate enemy submarines

B. used by ships to determine the depth of water beneath them

C. a detective device that uses sound to locate under - water objects

D. All the above

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4

Metals are good conductors of heat because

A. they contain free electrons

B. their atoms are relatively far apart

C. their atoms collide frequently

D. they have reflecting surfaces

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4

A piece of ice is Boating In water kept in a beaker. When all the ice melts the level of water will

A. first rise and then fall

B. fall

C. remain the same

D. rise

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4

The hygrometer is an apparatus used for finding the

A. temperature of air

B. intensity of light

C. density of a liquid

D. relative humidity of the atmosphere

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4

Two tumblers stuck together can be separated by

A. pouring ice cold water into the inner tumbler

B. pouring ice cold water on the outer tumbler

C. pouring hot water into the inner tumbler

D. dipping both the tumblers in hot water

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4

The transistor was invented by

A. Marconi

B. Baird

C. John Bardeen, Walter H. Brattain and William Shockley

D. Edison

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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

The difference between planets and stars is

A. planets do not have light of their own whereas stars shine by their own light

B. planets do not twinkle like stars

C. planets are much smaller than stars

D. All the above

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4

Air escaping rapidly from a narrow orifice in an inflated tyre feels cool because

A. the speed with which it escapes cools it down

B. of the higher temperature of the surroundings

C. of sudden expansion causing loss of internal energy

D. there is no real fall in temperature

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4

Red Light is used as a dancer signal because

A. it is pleasing to the eye

B. it has a traditional colour

C. it is easily distinguishable

D. it is most sensitive to the human eye

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4

Air pressure is usually highest when the air is

A. warm and moist

B. cool and dry

C. warm and dry

D. cool and moist