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Current Affairs January 2024

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4

Diamond shines because of its

A. purity

B. hardness

C. high density

D. high refractive index and low critical angle

Correct Answer :

D. high refractive index and low critical angle


Related Questions

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In a refrigerator, the refrigerant is

A. Nitrogen

B. Oxygen

C. Chlorine

D. Freon

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A balloon ruled with hydrogen will

A. continue going upwards uninterrupted

B. reach a particular height and remain floating

C. burst after reaching some height

D. reach a particular height and start coming down

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4

The velocity of sound in a medium is

A. directly proportional to its pressure

B. inversely proportional to the square root of its pressure

C. directly proportional to the square root of its pressure

D. independent of its pressure

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4

If a bar magnet is broken into two pieces

A. both pieces will lose their magnetism

B. one piece will have North Pole on both ends and the other South Pole on its both ends

C. each will remain a magnet with North Pole at one end and South Pole at the other

D. the longer piece will behave as a bar magnet while the smaller will have no magnetism at all

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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

Nichrome is used in electric heaters and irons because

A. it resists oxidation when red hot

B. its melting point is high

C. it has got 60 times the resistance of copper

D. All the above

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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

Credit for starting Space Science Research in India goes to

A. HJ Bhabha

B. SS Bhatnagar

C. V Sarabhai

D. CV Raman

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4

The audible range of a normal human ear is frequencies ranging from

A. 10000 to 20000 Hz

B. 50 to 15000 Hz

C. 20 to 20000 Hz

D. 15 to 50000 Hz

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4

Halley's comet appears in the heavens once in

A. 40 years

B. 50 years

C. 76 years

D. 80 years

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For detecting and, testing of small electric charges we use

A. an electrophorus

B. an electroscope

C. an electromagnet

D. an ammeter

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4

The planet with the reddish tinge is

A. Jupiter

B. Mars

C. Mercury

D. Saturn

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A person cups his hand around the mouth when shouting. Why?

A. Sound energy from his mouth is then directed in one direction

B. The cupped hand acts as a cardboard tube of short length

C. The pitch of sound increases

D. Both (a) and (b)

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4

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

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4

A car parked in the sun with its windows closed gets terribly hot inside. This is due to

A. the heat emitted by the engine

B. the greenhouse effect

C. the good conducting power of the metal body

D. the double layered wind shield

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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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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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Moon has no atmosphere because

A. it has no population

B. it is quite far off

C. its surface is full of rocks

D. its gravity is not sufficient for any atmosphere to hold on to it

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4

Choose the correct answer

A. Microphone converts sound energy into electrical energy.

B. Electric fan converts electrical energy into mechanical energy.

C. Battery converts chemical energy into electrical energy.

D. All the above

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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

The planet that is known as earth's twin is

A. Mercury

B. Venus

C. Moon

D. Mars

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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

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4

The force of attraction or repulsion between two charged bodies is directly proportional to the product of the charges and inversely proportional to the square of distance between them. This was propounded by

A. Coulomb

B. Gilbert

C. Volta

D. Rutherford

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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

When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon Is known as

A. doppler effect

B. beats

C. resonance

D. echo

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4

When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is

A. the violet ray

B. the red ray

C. the green ray

D. the blue ray

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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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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

The stars that shine brightly then dimly and then brightly are known as

A. meteors

B. binaries

C. variable stars

D. bright stars

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Heat is transmitted from one end of a metal rod to its other end by the method of

A. conduction

B. convection

C. radiation

D. sublimation