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Current Affairs January 2024

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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

Correct Answer :

A. umbra


Related Questions

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The attraction of unlike molecules at the common surface is known as

A. adhesion

B. cohesion

C. surface tension

D. capillarity

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4

The function of a ruse wire is

A. to stabilise the voltage

B. to decrease the current supply

C. to increase the current supply

D. to prevent an unduly high current from passing through a circuit

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4

Who first established the fact that the earth revolves round the sun?

A. Sir Isaac Newton

B. Kepler

C. Copernicus

D. Ptolemy

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4

A cyclist leans inwards when he is negotiating a curve 10 that

A. he may increase his speed

B. his weight may be reduced

C. necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion

D. no frictional force may be produced between the wheels and the axle

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4

Which of the following is known as freon?

A. Liquid ammonia

B. Carbon tetrafluoride

C. Dichloro-difluoro-methane

D. Sulphur dioxide

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4

Changing of one element into another element is known as

A. transmutation

B. fission

C. fusion

D. radioactivity

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Alpha particles are

A. electromagnetic radiations

B. helium nuclei

C. negatively charged particles

D. neutral particles

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4

The nuclear model of atom was first visualised by

A. Rutherford

B. Neils Bohr

C. Albert Einstein

D. JJ Thompson

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4

Who first established the fact that the earth revolves round the sun?

A. Sir Isaac Newton

B. Kepler

C. Copernicus

D. Ptolemy

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4

The electrical domestic tube light gives white fiourescent light because of

A. collision between molecules of filled gas under electric current

B. heavy current

C. vacuum inside the tube

D. falling of ultra violet rays on the white inner coating of the tube

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4

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

The number of electrons in the outer orbits of a nucleus gives

A. the mass number

B. atomic number

C. atomic weight

D. absolute number

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The attraction between similar molecules is called

A. inertia

B. adhesion

C. cohesion

D. friction

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4

When a charged rod is brought near a collection of small pith balls, the balls

A. will jump rapidly up and down for a short time

B. will remain unaffected

C. Both (a) and (b) above

D. It will produce electric shock

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4

An astronomical unit of distance is

A. a kilometre

B. light year

C. the average distance from the earth to the sun

D. None of the above

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Echoes are produced by

A. the reflection of sound waves

B. the refraction of sound waves

C. the interference of sound waves

D. reverberation of sound waves

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4

A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

A. will increase

B. will decrease

C. does not change

D. varies with the increase of depth of the immersion of the iron piece

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4

A nuclear reactor is said to have become 'critical' when

A. it stops due to malfunctioning

B. it starts emitting dangerous radioactive radiations

C. it is shut down to avoid explosion

D. it is ready to produce controlled energy

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4

In very cold countries alcohol is used as a thermometric liquid because

A. alcohol is a poor conductor of heat

B. alcohol can be coloured for its level to be seen easily

C. its freezing point is very low

D. it will not stick to the glass tube

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When sound waves travel from one medium to another, the quantity which remains unchanged is its

A. speed

B. frequency

C. wavelength

D. All the above

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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

The instrument used to measure atmospheric pressure is

A. Pyrometer

B. Eudiometer

C. Barometer

D. Hydrometer

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4

Photo-electric cells convert

A. electrical energy into light energy

B. light energy into electrical energy

C. light energy into heat energy

D. electrical energy into heat energy

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4

Atoms which have the same atomic number but different mass numbers are called

A. isobars

B. isomers

C. isotones

D. isotopes

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Some persons are not able to see distant objects clearly because the image of the object is focused in front of the retina. This defect is known as

A. short sight

B. long sight

C. astigmatism

D. presbyopia

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The focal length or lens or the eye is under the control or the

A. iris

B. pupil

C. ciliary body

D. cornea

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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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The sun continuously produces an enormous amount of energy. This is due to

A. nuclear fission

B. nuclear fusion

C. chemical combustion

D. boiling

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Sound travels fastest in

A. air

B. water

C. iron

D. vacuum

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The weight of a body is

A. maximum at the equator

B. minimum at the equator

C. minimum at the poles

D. the same everywhere