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Current Affairs January 2024

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4

Frictional force acts in

A. the same direction as the motion

B. the opposite direction of the motion

C. all the directions

D. upward direction

Correct Answer :

B. the opposite direction of the motion


Related Questions

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4

Which of the following can produce electricity?

A. resistor

B. thermocouple

C. light bulb

D. neon tube

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4

Of the following types of electromagnetic radiation which has the longest wavelength?

A. ultraviolet rays

B. gamma rays

C. radio waves

D. infrared waves

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4

In the fuse of an electrical installation blows out

A. replace the fuse by a thin wire

B. replace the fuse by a thick copper wire

C. replace the fuse by a fuse wire of proper rating

D. replace the fuse by nichrome wire

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4

A ship sailing from a river to the sea

A. sinks less in the sea

B. sinks more in the sea

C. neither sinks more nor less in the sea

D. sinking more or less depends on sea

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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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The leader of the team who succeeded in constructing the first nuclear reactor (an atomic pile) in the world was

A. Albert Einstein

B. Enrico Fermi

C. HJ Bhabha

D. Sir Isaac Newton

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4

When one enters a dark room after being in bright light one is not able to see anything clearly for a while because

A. the retina of the eye moves forward

B. the retina of the eye moves backward

C. c).the iris is unable to dilate the pupil immediately to be able to see things

D. the eye has no power of accommodation

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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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X-rays were discovered by

A. Wilhelm Roentgen

B. WO Coolidge

C. Henry Cavendish

D. William Watson

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4

The base of an electric iron is brightly polished mainly

A. to make it smooth and frictionless

B. to make it rust - proof

C. to reduce heat loss by radiation

D. to make it more durable

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4

A permanent magnet may be demagnetised by

A. placing it inside a solenoid through which an alternating current is flowing

B. heating the magnet to redness and then allowing it to cool

C. dropping it several times or hammering it while lying east-west

D. All the above

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4

It is difficult to bon potatoes at the top or a mountain because

A. the water available is hard

B. it is colder than at sea level

C. the potatoes become hard

D. the boiling point of water is lower at that height on account of low atmospheric pressure

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The attraction between similar molecules is called

A. inertia

B. adhesion

C. cohesion

D. friction

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Pieces of camphor placed on water move about rapidly. This is because of

A. diffusion

B. viscosity

C. surface tension

D. capillarity

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Pyrometers are instruments used

A. for measuring the velocity of wind

B. in the manufacture of fireworks

C. in finding the coefficient of apparent expansion of a liquid

D. for measuring high temperatures

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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

Enriched uranium means

A. Uranium that is very pure

B. Uranium in which the concentration of the isotope U-238 is more than in the naturally occuring uranium

C. Uranium in which the concentration of the isotope U-235 is more than in the naturally occuring uranium

D. None of the above

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4

When a ship floats on water, the weight or water displaced is

A. an indeterminate quantity

B. equal to the weight of the ship

C. greater than the weight of the ship

D. less than the weight of the ship

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4

In a river, the currents are fastest where the river la

A. wide and shallow

B. narrow and shallow

C. wide and deep

D. narrow and deep

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4

Photocells are used

A. in burglar alarms

B. in automotive devices for light switches

C. television cameras

D. All the above

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4

Holography is the technique of

A. taking photos of various objects

B. recording and reproducing three dimensional images

C. tracing out planets and stars in the sky

D. transmitting light waves

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4

In an electrical circuit, a fuse is connected

A. in the live wire

B. in the neutral wire

C. in the earth wire

D. anywhere

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4

In a vacuum the following three articles are dropped at the same time and from the lame height. Which will reach the ground quicker?

A. a stone

B. a piece of wood

C. a feather

D. all will reach the ground at the same time

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4

A ruse wire is characterised by

A. high resistance and high melting point

B. high resistance and low melting point

C. low resistance and high melting point

D. low resistance and low melting point

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4

What la the minimum velocity required for a rocket to overcome earth's gravity and travel into space?

A. 18 km/sec

B. 11.2 km/ sec

C. 21 km/ sec

D. 35 km/ sec

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4

A man Jumping out of a moving train is thrown

A. forward

B. backward

C. sideways

D. None of the above

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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

Electromagnets are used in

A. the telephone ear piece

B. the telegraph

C. the electric bell

D. All the above

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4

The completely dark portion of a shadow of an object is known as

A. umbra

B. penumbra

C. image

D. black portion of light

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A heavenly body similar in nature to the sun intensely hot glowing mass that produces its energy by thermonuclear reactions is

A. a planet

B. a meteor

C. a star

D. a comet