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Current Affairs January 2024

What is the correct answer?

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

Correct Answer :

A. short sight


Related Questions

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4

Tea pots are highly polished

A. so that they may reflect thermal radiation from outside and minimise such radiation from them

B. so that they may absorb all radiation from outside

C. to make them attractive to look at

D. because they take high polish

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4

The red colour of the setting sun is due to

A. the least scattered red colour reaching the eye

B. the dispersion of sun light occurred in air molecule in atmosphere

C. the diffraction of sunrays in atmospheric layers

D. interference of all the rays coming from the sun

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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

The velocity required to place a vehicle in orbit round the moon is _________ that required to place it in orbit round the earth.

A. less than

B. greater than

C. equal to

D. greater than or equal to

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4

The ballistic missile, Agni 11, tested by India has a maximum range of

A. 1000 km

B. 1500 km

C. 2000 km

D. 500 km

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4

One finds it more difficult to walk on ice than on a concrete road because

A. there is more friction on ice than on concrete surface

B. ice is soft and spongy while concrete is hard

C. the friction between ice and the feet is less than that between the concrete and the feet

D. None of them

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4

Increase in pressure

A. increases the melting point of ice

B. decreases the melting point of ice

C. has no effect on the melting point of ice

D. increases the volume of the ice

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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

Which part of the eye photographic camera?

A. Lens

B. Iris

C. Retina

D. Eyelid

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4

The base of an electric iron is brightly polished mainly

A. to make it smooth and frictionless

B. to make it rust - proof

C. to reduce heat loss by radiation

D. to make it more durable

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4

The image of an object formed on the retina of the eye is

A. virtual and upright

B. virtual and inverted

C. real and inverted

D. real and upright

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4

Of the following types of electromagnetic radiation which has the longest wavelength?

A. ultraviolet rays

B. gamma rays

C. radio waves

D. infrared waves

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4

For accurate scientific work, temperatures are often measured by

A. mercury thermometers

B. alcohol thermometers

C. platinum resistance thermometers

D. thermoelectric thermometers

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4

When are temperature resistance

A. increases

B. decreases

C. remains the same

D. first increases then decreases

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4

A stationary elevated object has

A. kinetic energy

B. potential energy

C. momentum

D. both potential and kinetic energy

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4

The filament used in the electric lamp is made of

A. nichrome

B. tungsten

C. copper

D. aluminium

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4

When a light ray is reflected repeatedly by a set of parallel plane mirrors, the intensity of light ray diminishes alter a few reflections. This is because of

A. poor reflection from the mirrors

B. scattering of light from the mirrors

C. absorption of some light by the mirrors

D. absorption of light by the atmosphere

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4

The cell that can be recharged, after it has run down, by passing a direct current through it from a source of current is

A. Voltaic cell

B. Leclanche cell

C. Dry cell

D. An accumulator

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4

The electrical domestic tube light gives white fiourescent light because of

A. collision between molecules of filled gas under electric current

B. heavy current

C. vacuum inside the tube

D. falling of ultra violet rays on the white inner coating of the tube

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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

In the ramous equation of Einstein E = mc2 , 'c' denotes.

A. velocity of sound

B. velocity of light

C. a constant factor

D. wavelength of light

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4

The Indian Space Research Organisation (ISRO) is located at

A. Thumba

B. Bangalore

C. Ahmedabad

D. New Delhi

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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

What is the correct answer?

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 planet that moves fastest around the sun is

A. Mars

B. Venus

C. Earth

D. Mercury

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4

Which of the following rays has the highest penetrative power?

A. �± -rays

B. �² -rays

C. �³ -rays

D. X-rays

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4

A photon is

A. a quantum of electromagnetic radiation

B. light source used in photography

C. a photo film

D. sun-light

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4

Why is nuclear fusion also known as thermonuclear reaction?

A. Fusion converts nuclear energy into heat

B. Fusion demands conditions of extremely high temperature to produce it

C. Fusion produces large amount of heat

D. Fusion reactions takes place in the sun

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4

Choose the correct answer

A. Microphone converts sound energy into electrical energy.

B. Electric fan converts electrical energy into mechanical energy.

C. Battery converts chemical energy into electrical energy.

D. All the above

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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)