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Current Affairs January 2024

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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

Correct Answer :

C. electric power - volt


Related Questions

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4

The instrument used to determine the RD (Relative Density) of a liquid by the principle of floatation is

A. Hygrometer

B. Hypsometer

C. Hydrometer

D. Densimeter

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4

Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.

A. rough white

B. rough black

C. shining white

D. shining black

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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

Stars twinkle because of

A. refraction of light from them through air

B. reflection

C. absorption

D. All the above

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4

The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because

A. the ringing is not loud enough

B. the glass of the bell jar absorbs the sound waves

C. the bell jar is too small

D. there is no air or -any other gas in the bell jar

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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

We cannot see and without the aid of a telescope

A. Neptune and Pluto

B. Jupiter and Saturn

C. Venus and Mars

D. Venus and Saturn

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4

The star nearest to the sun is

A. Proxima Centauri

B. Sirius

C. Aldebaran

D. Vega

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4

A nuclear reactor is said to have become 'critical' when

A. it stops due to malfunctioning

B. it starts emitting dangerous radioactive radiations

C. it is shut down to avoid explosion

D. it is ready to produce controlled energy

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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

Galaxies emit

A. radio waves and X-rays

B. ultraviolet light waves

C. visible light waves

D. All the above

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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

On applying a constant force to a mass, It moves with a uniform

A. velocity

B. momentum

C. acceleration

D. angular velocity

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4

A device used to measure heights above sea level is known as

A. altimeter

B. anemometer

C. dilatometer

D. potentiometer

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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

The maximum displacement of the particle in a mechanical wave motion is known as

A. amplitude

B. vibration

C. frequency

D. phase

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4

Pieces of camphor placed on water move about rapidly. This is because of

A. diffusion

B. viscosity

C. surface tension

D. capillarity

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4

A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle

A. at the lower elevation than the bird

B. at a higher elevation than the bird

C. in the same direction as the bird

D. vertically upwards

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4

When a body Is taken to the poles from the equator, Its weight becomes

A. greater

B. less

C. the same

D. None of these

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4

Formation of shadows can be explained by

A. rectilinear propagation of light

B. reflection

C. refraction

D. total internal reflection

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4

The loudness of a sound is determined by

A. Frequency

B. Amplitude

C. Speed

D. Wavelength

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4

Heat transfer

A. cools the body that transfers it

B. heats the body that absorbs the heat

C. may change the physical state of the substance

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

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

Photoelectric cell is a device which converts

A. light energy into electrical energy

B. electrical energy into light energy

C. magnetic energy into electrical energy

D. electrical energy into mechanical energy

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4

If a body is taken from the earth to the moon

A. both its mass and weight will be different

B. its mass will be different but the weight will remain the same

C. its mass and weight will both remain unchanged

D. its mass will remain the same but weight will be different

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4

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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4

The resistance of a wire depends on

A. the material of the wire

B. the length of the wire

C. the cross section of the wire

D. All the above

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4

When a steel ball is placed on the surface of mercury, it does not sink because

A. of the surface tension of mercury

B. mercury is a semi-solid

C. of the high viscosity of mercury

D. the density of mercury is greater than that of steel

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4

A device used in a ship for the purpose of measuring the depth of the sea is

A. an altimeter

B. a fathometer

C. a hydrometer

D. a sonometer