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Current Affairs January 2024

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The unit of heat energy is

A. watt

B. degree

C. joule

D. erg

Correct Answer :

C. joule


Related Questions

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The radius of an atom is approximately

A. 10-10 cm

B. 10-12 cm

C. 10-13 cm

D. 10-16 cm

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Sound waves

A. are electromagnetic waves

B. can easily pass through vacuum

C. are always transverse waves

D. require a material medium for propagation

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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 lightning conductor installed in a building

A. does not allow the lightning to fall on the building at all

B. drives away the charged clouds

C. forces the lightning to fall on other buildings near that building

D. conducts the electric charges to the ground when lightning strikes the building

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4

A thermostat is a device used

A. for automatically maintaining a steady temperature

B. for measuring electricity

C. to reduce the voltage of electricity

D. for producing heat

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When the resistance of a circuit increases the current will

A. increase

B. decrease

C. remain the same

D. None of the above

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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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The strength of an electromagnet can be increased by

A. increasing the length of the coiled wire

B. increasing current supply

C. increasing the size of the iron core

D. All the above

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4

The best estimates of the age of the earth comes from the studies of

A. angle of inclination of the earth

B. changes in radio-active minerals in it

C. period taken by Sun's light to reach the earth

D. artificial satellites revolving round the earth

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4

The Solar System lies near the edge of a galaxy known as

A. The Milky Way

B. Radio Galaxy

C. Andromeda Nebula

D. Magellanic Clouds

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The ozone layer absorbs

A. Cosmic rays

B. Infrared rays

C. All radiations of light

D. Ultra violet rays coming from the sun

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4

Stars twinkle because of

A. refraction of light from them through air

B. reflection

C. absorption

D. All the above

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A series of east moving still pictures can be made to appear as a moving picture because the eye

A. can focus very rapidly as pictures change

B. is quicker than the brain

C. can see two images separated only if the interval' between seeing them is more than' one-tenth of a second

D. can shut out some of the light

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Cyclotron is an apparatus used

A. as an accelerator for imparting energies to charged particles of atomic magnitudes

B. to reduce the charge on a particle

C. to produce intense magnetic field

D. to produce intense electrical field

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A light year means

A. a unit of time

B. a unit of length

C. a year of no consequence

D. illumination throughout the year

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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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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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The atmosphere gets heated up mainly by

A. direct sun's rays

B. radiation from earth's surface

C. radiogenic heat (resulting from radioactive decay)

D. cosmic rays coming from space

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If an object is placed between two parallel plane mirrors, the number of images formed will be

A. 1

B. infinite

C. 0

D. 4

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When an incident beam of light strikes the surface of a glass slab normally, the refracted beam

A. goes straight through without bending

B. gets deviated away from the normal

C. gets bent towards the normal

D. gets reflected

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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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The numerical reading of the Fahrenheit thermometer of a given temperature

A. is proportional to that of the Celsius thermometer

B. is always greater than that of the Celsius thermometer

C. is always less than that of the Celsius thermometer

D. may be greater than or less than or equal to that of the Celsius thermometer

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4

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

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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

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

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4

A hydraulic brake in an automobile uses

A. a fluid to transmit the braking force

B. the force applied by the driver

C. hydrogen gas and not any liquid

D. a vacuum brake

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4

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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When an electric bulb breaks, there is 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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Of the following which has got the highest frequency?

A. ultraviolet rays

B. gamma rays

C. radio waves

D. infrared waves

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Air escaping rapidly from a narrow orifice in an inflated tyre feels cool because

A. the speed with which it escapes cools it down

B. of the higher temperature of the surroundings

C. of sudden expansion causing loss of internal energy

D. there is no real fall in temperature