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Current Affairs January 2024

What is the correct answer?

4

Which of the following is wrongly matched?

A. electric current - ampere

B. resistance - Ohm

C. electric power - volt

D. electric charge Coulomb

Correct Answer :

C. electric power - volt


Related Questions

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4

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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4

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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4

Where does the centre of gravity of a rubber ring lie?

A. on the outer surface

B. in the inner surface

C. at the centre of the ring

D. None of the above

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4

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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4

Acoustics' la a branch or study dealing with

A. historical sites

B. architecture

C. sound

D. trigonometry

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4

Frictional force acts in

A. the same direction as the motion

B. the opposite direction of the motion

C. all the directions

D. upward direction

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4

Light from the sun reaches the earth in

A. 2 minutes

B. 4 minutes

C. 12 minutes

D. 8 minutes

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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 solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will

A. increase

B. decrease

C. remain unaffected

D. have its shape changed

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4

In experiments on static electricity the standard method for obtaining small amounts of positive electricity is to rub

A. a glass rod with flannel

B. an abonite rod with flannel

C. a glass rod with silk

D. Any of the above

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4

If you want to open a door with les difficulty you push it

A. at the middle

B. at a point away from the hinge (near the rim)

C. near the hinge

D. None of the above

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4

When sound waves travel from one medium to another, the quantity which remains unchanged is its

A. speed

B. frequency

C. wavelength

D. All the above

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4

A bolometer is used to measure

A. the quantity of heat energy in a body

B. thermal radiations quantitatively

C. high temperature

D. the intensity of sound

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4

The inability of a body to change its state of rest or uniform motion along a straight line is called its

A. momentum

B. velocity

C. acceleration

D. inertia

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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

Separating particles from a suspension is effected by

A. centrifugal force

B. frictional force

C. gravitational force

D. distillation

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4

The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by

A. Bernoulli's principle

B. Magnetic properties of the ship's material

C. Newton's third law of motion

D. Earth's gravitational force

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4

A workman was working on a rail track. A young boy at a distance holds his ear close to the railway track. The boy was able to hear the sound of each blow or the workman twice. It is because

A. speed of sound is greater in steel than in air

B. speed of sound is greater in air than in steel

C. part of sound waves is reflected between rail tracks

D. the boy's ears are at a different distance from the source

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4

In an oil lamp, holes are provided below the chimney so that

A. necessary oxygen for burning of oil may be provided

B. the convection current of air may be maintained to keep the lamp burning

C. the brightness of the lamp may be increased

D. All the above

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4

When water is cooled from 4�C to 2�C its density

A. increases

B. decreases

C. remains the same

D. first increases then decreases

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4

The heating element often used in an electric iron is

A. copper

B. tungsten

C. mica

D. nichrome

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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

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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4

The planet that spins Caster than any other planet is

A. Saturn

B. Jupiter

C. Earth

D. Mercury

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4

We always see only one side of the moon because

A. the sun comes in between the earth and moon

B. the moon is stationary

C. the time taken by the moon to rotate on its axis is the same as the time taken by it to revolve round the earth

D. moon revolves round the sun

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4

Which of the following is wrongly matched?

A. electric current - ampere

B. resistance - Ohm

C. electric power - volt

D. electric charge Coulomb

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4

The image of an object formed in a plane mirror

A. is real

B. is virtual

C. can be obtained on a screen

D. is slightly bigger than the object

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4

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

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4

The electroplating of a metallic article

A. protects the article from atmospheric corrosion

B. gives it a more attractive appearance

C. Both (a) and (b) above

D. None of the above

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4

A hydrogen bomb is based on

A. nuclear fusion

B. nuclear fission

C. Both (a) and (b) above

D. Neither (a) nor (b)