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Current Affairs January 2024

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4

The unit of power in SI is

A. Joule

B. Newton

C. Joule/Sec

D. Erg/Sec

Correct Answer :

C. Joule/Sec


Related Questions

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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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4

Metals are good conductors of heat because

A. they contain free electrons

B. their atoms are relatively far apart

C. their atoms collide frequently

D. they have reflecting surfaces

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4

Out of the following which is an insulator?

A. Silver

B. Copper

C. Nichrome

D. Dry wood

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4

Sun spots are

A. the mountains found on the surface of the Sun

B. the dark patches on the sun having less temperature than the normal sun's surface

C. ionized gas found near the solar surface

D. the magnetic storms on the surface of the Sun

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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

One can be recognised by his voice alone due to the factor of

A. quality

B. amplitude

C. pitch

D. loudness

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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

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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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

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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4

The scientist who first sent electromagnetic waves to distant places was

A. James Clerk Maxwell

B. Heinrich Hertz

C. Thomas Alva Edison

D. Baird

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4

Which force is used when milk is churned to separate cream?

A. cohesive

B. centrifugal

C. frictional

D. gravitational

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4

In which of the following will a piece of iron weigh most?

A. in air

B. in an atmosphere of oxygen

C. in an atmosphere of CO2

D. in vacuum

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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

A simple mercury barometer is found in a slightly slanting position. The atmospheric pressure

A. is found by measuring the slanting height of the mercury column

B. is given by the vertical height

C. cannot be measured with it

D. u) can be measured by both the methods described above

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4

The unit of heat energy is

A. watt

B. degree

C. joule

D. erg

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4

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 extremely luminous objects located at the centre of some distant galaxies and which are sources of high energy electromagnetic radiation are known as

A. Nebulae

B. Quasars

C. Meteors

D. Comets

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4

A bullet is fired at a certain angle with the horizontal. Its path will be

A. elliptical

B. a straight line

C. a parabola

D. a vertical line

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Cosmic rays contain

A. protons and electrons

B. alpha particles

C. gamma rays

D. All the above

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4

Under similar conditions of temperature and pressure, the velocity of sound is maximum in

A. helium

B. argon

C. hydrogen

D. oxygen

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4

The radiator in a car serves to

A. cool the engine

B. heat up the engine

C. start the car

D. moderate the speed

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4

Warm air will hold more water vapour than cold air because

A. it is lighter

B. it has more water vapour in it

C. its molecules are close together

D. its molecules are far apart

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4

The phenomenon of radioactivity was discovered by

A. Rutherford

B. Bohr

C. Henri Bacquerel

D. Marie Curie

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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

Astigmatism, a structural defect of the eye, is due to

A. the eye lens being thin

B. the eye lens being thick

C. lack of symmetry in the curvature of the eye preventing rays of light from being brought to a common focus

D. the pupil being very small

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4

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

When a particle in motion is acted upon by a force in a direction perpendicular to the direction of motion, the path followed by the particle will be

A. a straight line

B. an ellipse

C. a circle

D. a parabola

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A temperature below absolute zero for an ideal gas

A. cannot be attained experimentally

B. can be attained

C. is impossible

D. Does not exist at all

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A proton is

A. the ionised hydrogen molecule

B. the nucleus of helium atom

C. the nucleus of hydrogen atom

D. the positive counterpart of electron