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Current Affairs January 2024

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Photo-electric cells convert

A. electrical energy into light energy

B. light energy into electrical energy

C. light energy into heat energy

D. electrical energy into heat energy

Correct Answer :

B. light energy into electrical energy


Related Questions

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Nuclear fission process means

A. absorption of a neutron by a nucleus

B. breakup of the nucleus of a heavy atom into two nearly equal halves emitting two or three neutrons and releasing large amounts of nuclear energy in the process

C. the scattering of neutrons

D. formation of heavier nucleus

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Dioptre is the unit of power of

A. convex mirrors

B. concave mirrors

C. concave lenses

D. lenses irrespective of types

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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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The planet that spins Caster than any other planet is

A. Saturn

B. Jupiter

C. Earth

D. Mercury

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The tiniest of the stars belong to the group known as

A. Giant stars

B. White Dwarf stars

C. Neutron stars

D. Super-giant stars

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The earth's nearest neighbour in space is

A. the Sun

B. the Moon

C. the Venus

D. the Mars

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Photo-electric cells convert

A. electrical energy into light energy

B. light energy into electrical energy

C. light energy into heat energy

D. electrical energy into heat energy

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4

Which of the following revolves round the nucleus in an atom?

A. protons

B. electrons

C. neutrons

D. positrons

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The heating element often used in an electric iron is

A. copper

B. tungsten

C. mica

D. nichrome

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When we sweat, we feel comfortable under a fan because

A. the air circulated by the fan is cool

B. the fan produces convection currents of air

C. the air circulated by the fan quickens the evaporation of the moisture on our skin

D. the air takes away the heat from our body

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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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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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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

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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The asteroids belt lies between the orbits of

A. Earth and Mars

B. Venus and Earth

C. Mars and Jupiter

D. Moon and Mars

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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

When a bullet is fired from a gun

A. the gun moves forward

B. the gun jumps up

C. the gun does not move

D. the gun recoils with the same momentum as the bullet

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The image formed by a plane mirror is

A. of the same size as the object

B. at the same distance behind the mirror as the object is in front of it

C. virtual and laterally inverted

D. All the above

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4

Skating on ice is possible because

A. the surface of ice is smooth

B. ice is cold

C. the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

D. the pressure on the ice due to skate raises its melting point

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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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A star contains

A. about 75% of hydrogen

B. 22% helium

C. traces of most other elements including oxygen, neon, carbon and nitrogen

D. All the above

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4

The Solar System lies near the edge of a galaxy known as

A. The Milky Way

B. Radio Galaxy

C. Andromeda Nebula

D. Magellanic Clouds

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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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The largest reserve of radioactive element which can be used in a nuclear reactor has been found in India, The name of the element is

A. Thorium

B. Uranium

C. Plutonium

D. Radium

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4

A hydraulic brake in an automobile uses

A. a fluid to transmit the braking force

B. the force applied by the driver

C. hydrogen gas and not any liquid

D. a vacuum brake

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4

The mirage is a phenomenon

A. generally considered as a desert happening

B. caused by unequal heating of the several layers of the atmosphere above the desert

C. in which the refracted rays take a curved path resulting in total internal refection

D. All the above

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Meteors

A. look like falling stars

B. are really pieces of rock or metal

C. burn up as they shoot through the air

D. All the above

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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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In a river, the currents are fastest where the river la

A. wide and shallow

B. narrow and shallow

C. wide and deep

D. narrow and deep

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Acoustics' la a branch or study dealing with

A. historical sites

B. architecture

C. sound

D. trigonometry