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Current Affairs January 2024

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4

When we tighten the string of a sitar or tanpura its pitch

A. remains the same

B. increases

C. decreases

D. None of the above

Correct Answer :

B. increases


Related Questions

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4

A solar eclipse occurs when the earth, the sun and the moon are in a straight line, and

A. when the moon passes between the sun and the earth

B. when the sun comes between the earth and the moon

C. when the earth comes between the sun and the moon

D. on a full moon day

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4

Sound waves in air are

A. transverse

B. longitudinal

C. transverse and longitudinal

D. neither transverse nor longitudinal

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4

When temperature decreases, resistance of metals to flow of electricity

A. increases

B. decreases

C. neither increases nor decreases

D. first increases then decreases

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4

Among the following the most suitable material for the core of an electro-magnet is

A. steel

B. wood

C. soft iron

D. copper

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4

The temperature of a large bucket-full of hot water (a few degrees below boiling point) is lower than a beaker full of boiling water. But

A. the hot water contains a much larger quantity of internal energy than the boiling water

B. the boiling water contains more quantity of internal energy than the warm water

C. both of them have got the same amount of internal energy.

D. nothing can be said definitely with the data given

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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

Out of the following which is an insulator?

A. Silver

B. Copper

C. Nichrome

D. Dry wood

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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 freezer in a refrigerator is placed near the top

A. to keep it away from the hot compressor which is near the bottom

B. because of convenience

C. so that it can cool the whole interior by setting up convection currents

D. to prevent too much cooling

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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 overhead wires supported by high towers in the grid system carry

A. alternating current of very high frequency

B. alternating current of very high voltage

C. a very large direct current

D. a high voltage direct current

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4

A convex mirror always produces

A. an erect, virtual image of diminished size

B. an erect, real image of diminished size

C. an erect, real image of double size

D. a virtual image of double size

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4

A man stands on the pan of a balance holding a fish in his right hand and bucket of water in his left hand. If he transfers the fish into the bucket, the total weight on the pan

A. increases

B. decreases

C. remains the same

D. first increases and then decreases

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4

Expansion of a rod when heated

A. is proportional to its original length

B. is proportional to the increase of temperature

C. is inversely proportional to its original length

D. Both (a) and (b) above

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4

In a freezer ice cubes will be formed more quickly in trays made of

A. rubber

B. plastic

C. aluminium

D. wood

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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

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

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

A sensitive instrument susceptible to magnetic infiuence can be protected from external magnetic field by

A. enclosing it in a thick walled iron box

B. wrapping it with an insulator

C. by placing it inside a glass case

D. by surrounding it with fine copper gauze

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4

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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4

The device that is used to measure the electromotive force of a cell is

A. an ammeter

B. a rheostat

C. a voltmeter

D. a voltameter

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4

The force of attraction or repulsion between two charged bodies is directly proportional to the product of the charges and inversely proportional to the square of distance between them. This was propounded by

A. Coulomb

B. Gilbert

C. Volta

D. Rutherford

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4

The radius of curvature of a spherical mirror is

A. equal to half its focal length

B. equal to its focal length

C. twice its focal length

D. not related to its focal length

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4

The theory that the earth constituted the centre of the universe around which the sun and the planets revolved was propounded by

A. Copernicus

B. Ptolemy

C. Newton

D. Kepler

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4

For an electron orbiting in a hydrogen atom, the necessary centripetal force keeping it in orbit is provided by

A. the electrical attraction between the negatively charged electron and the positively charged porton

B. the high speed of the electron

C. the low speed of the electron

D. gravity

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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

An ohm is a unit of

A. potential difference

B. resistance

C. current

D. All the above

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4

A timer in a race is at the finish line. He should start his stop watch

A. as soon as he hears the report of the gun

B. the moment he sees the flash

C. either (a) or (b) since that makes no difference

D. None of the above

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4

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 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