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Current Affairs January 2024

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If you want a sound proof room, the walls should be

A. able to refract the sound

B. good absorbers of sound

C. good reflectors of sound

D. All the above

Correct Answer :

B. good absorbers of sound


Related Questions

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Primary colours are

A. colours of the rainbow

B. colours in the spectrum of white light

C. colours which cannot be produced by mixing other colours

D. colours found in nature

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Meteors

A. look like falling stars

B. are really pieces of rock or metal

C. burn up as they shoot through the air

D. All the above

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In the nucleus of an atom, the uncharged particle is

A. proton

B. neutron

C. electron

D. positron

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When a bowler spins a ball, it changes its direction in the air. This is due to

A. turbulence caused by the wind

B. buoyancy of air

C. unequal pressures acting on it

D. sudden change in the direction of the wind

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Solar radiation is preferred to other sources of energy because

A. it is practically inexhaustible

B. it is the cheapest form of energy

C. it does not cause pollution

D. All of the above

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A spherical mirror is

A. a reflecting elliptical portion

B. a reflecting spherical surface

C. a parabolic reflecting surface

D. a flat reflecting surface

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Nuclear fusion is a process in which

A. the atoms and molecules lose their identity

B. nucleus is split into fragments

C. the nuclear reaction between two light atomic nuclei results in the formation of a heavier nucleus with release of a large quantity of nuclear energy in the process

D. absorption of neutron by a nucleus

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The power of a lens is

A. equal to its focal length

B. equal to its radius of curvature

C. equal to the reciprocal of its focal length (in metres)

D. equal to twice its focal length

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We see the flash of lightning before hearing the thunder because

A. light travels very much faster than sound

B. sound travels faster than light

C. lightning occurs nearer than thunder

D. both travel at the same speed

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Galaxies emit

A. radio waves and X-rays

B. ultraviolet light waves

C. visible light waves

D. All the above

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The phenomenon of radioactivity was discovered by

A. Rutherford

B. Bohr

C. Henri Bacquerel

D. Marie Curie

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The source of electric energy in an artificial satellite is

A. mininuclear reactor

B. a dynamo

C. a thermopile

D. solar cells

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The shadow below a tree has bright spots in it because

A. light comes through circular gaps between the leaves

B. the leaves are circular

C. the rays bend to form circular spots

D. the gaps between the leaves act as pin holes

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Increase in pressure

A. increases the melting point of ice

B. decreases the melting point of ice

C. has no effect on the melting point of ice

D. increases the volume of the ice

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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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The evaporation rate depends on

A. the nature of the liquid

B. area of the exposed surface of the liquid

C. temperature of air and of the liquid

D. All the above

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Before the invention of geostationary satellites, television stations could not transmit their programmes to far off places because

A. these signals are electromagnetic in nature

B. these are not electromagnetic in nature

C. their wavelength is very large

D. they are not reflected by the ionosphere but pass through it

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The direction of heat flow between two objects depends on

A. their heat contents

B. their masses

C. their temperatures

D. whether they are in solid, liquid or gaseous state

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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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An electric charge is measured in

A. coulomb

B. ampere

C. volt

D. watt

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When light travels from one medium to another there is a change in its

A. velocity

B. wavelength

C. frequency

D. Both (a) and (b) above

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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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For accurate scientific work, temperatures are often measured by

A. mercury thermometers

B. alcohol thermometers

C. platinum resistance thermometers

D. thermoelectric thermometers

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A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

A. the ball will travel towards the centre of the circle and fall down

B. it will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down

C. it will fall down at the same place where the string breaks

D. None of these

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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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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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The spectrum of white light can be studied by

A. a microscope

B. a telescope

C. a stereoscope

D. a spectroscope

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Commonly used safety fuse wire is made of

A. Tin

B. Lead

C. Nickel

D. An alloy of tin and lead

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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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The cell that can be recharged, after it has run down, by passing a direct current through it from a source of current is

A. Voltaic cell

B. Leclanche cell

C. Dry cell

D. An accumulator