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Current Affairs January 2024

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4

When ice melts, Its volume

A. decreases

B. increases

C. remains the same until all the ice has melted and then increases

D. remains the same

Correct Answer :

A. decreases


Related Questions

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4

The velocity of sound in air

A. increases as the square root of the absolute temperature

B. decreases with temperature

C. is independent of temperature

D. None of these

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4

The heat generated in a conductor carrying current is proportional to

A. the resistance

B. the square of the current flowing through it

C. the time the current flows

D. All the above

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4

Which of the following revolves round the nucleus in an atom?

A. protons

B. electrons

C. neutrons

D. positrons

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4

The pressure of air at high altitude is less than the atmospheric pressure at the sea level. Hence the boning point of water at a hill top

A. is more than at sea level

B. is equal to that sea level

C. is less than at sea level

D. depends on the surrounding temperature

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4

In the visible spectrum which colour has the shortest wavelength?

A. Red

B. Blue

C. Yellow

D. Violet

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4

Which of the following sets of elementary particles have nearly equal masses?

A. Neutron and Proton

B. Electron and Proton

C. Neutron and Electron

D. Proton, Neutron and Electron

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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

The minimum velocity required by a satellite to escape earth's gravitational pull is

A. 18 km/s

B. 11.2 km /s

C. 21 km/s

D. 35 km/s

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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

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

Ultrasonic waves are used

A. in medical and surgical diagnosis

B. in testing the quality of the linings and pads used in vehicles and aircraft brakes

C. to clean surgical instruments, jewellery and similar articles

D. All the above

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4

Fish and other aquatic creatures can live inside a deep frozen pond because

A. fish are cold-blooded animals

B. ice is a bad conductor of heat

C. there will always be water just beneath the ice level

D. they can adapt themselves to live in ice

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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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4

In a microphone

A. sound energy is converted into electrical energy

B. electrical energy is converted into sound energy

C. sound energy is converted into mechanical energy

D. mechanical energy is converted into sound energy

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4

The heat produced in a conductor due to the passage of a current through it is proportional to

A. the square of the current

B. the resistance of the conductor

C. the time for which the current flows

D. All the above

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4

The electron has a mass equal to

A. 1.9 x 10-13 kg

B. 9.1 x 10-31 kg

C. 1 x 10-15 kg

D. 1.6 x 10-19 kg

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4

Tea pots are highly polished

A. so that they may reflect thermal radiation from outside and minimise such radiation from them

B. so that they may absorb all radiation from outside

C. to make them attractive to look at

D. because they take high polish

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4

Mercury is used in a barometer because

A. its density being very high 13.6 g/cm3 the height of mercury column is conveniently small

B. at the ordinary temperature its vapour pressure is small

C. it is opaque and does not wet glass

D. All the above

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4

The hydraulic jack to lift heavy vehicles in automobile service stations is one of the applications of

A. Pascal's law

B. Principle of Archimedes

C. Boyle's law

D. Hooke's law

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4

Radio waves sent out by radio stations are reflected by

A. troposphere

B. stratosphere

C. mesosphere

D. ionosphere

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4

You want a supply of a small but constant current. Which of the following cells will you prefer?

A. Daniell cell

B. Leclanche cell

C. Dry cell

D. All the above

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4

Antiparticle of electron is

A. proton

B. antiproton

C. positron

D. neutron

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4

At what temperature do the Fahrenheit and Celsius scales give the same reading?

A. 212°

B. 32°

C. -40°

D.

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4

Water has maximum density at

A. 0° C

B. -15° C

C. 4° C

D. 15° C

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4

A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

A. a parabola

B. a horizontal straight line

C. a vertical straight line

D. a circle

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4

Mercury is used in thermometers because

A. it has high thermal conductivity

B. it has uniform expansivity

C. it has high boiling point and low freezing point

D. of all the above

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4

The orbit of Venus lies between those of

A. Mercury and Earth

B. Earth and Mars

C. Mars and Saturn

D. Mars and Jupiter

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4

Besides protons, the nucleus of an atom contains

A. electrons

B. neutrons

C. neutrons and electrons

D. electrons, neutrons and other particles

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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

The end product in the uranium disintegration series is

A. lead

B. zinc

C. carbon

D. tin