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Current Affairs January 2024

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Gamma radiations are used for

A. sterilising food stuff

B. controlling pests

C. cancer therapy

D. All of these

Correct Answer :

D. All of these


Related Questions

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Alpha particles are

A. electromagnetic radiations

B. helium nuclei

C. negatively charged particles

D. neutral particles

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The barometer was invented by

A. Michael Faraday

B. Torricelli

C. Thomas Alva Edison

D. Benjamin Franklin

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The leader of the team who succeeded in constructing the first nuclear reactor (an atomic pile) in the world was

A. Albert Einstein

B. Enrico Fermi

C. HJ Bhabha

D. Sir Isaac Newton

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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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Radio waves sent out by radio stations are reflected by

A. troposphere

B. stratosphere

C. mesosphere

D. ionosphere

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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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An integrated circuit la more advantageous than a conventional circuit because

A. they make the electric equipment more reliable and easier for servicing

B. a faulty part of a conventional circuit may be difficult to locate and repair

C. if a part of the integrated circuit fails the entire circuit is simply replaced

D. All the above

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A piece of ice is Boating In water kept in a beaker. When all the ice melts the level of water will

A. first rise and then fall

B. fall

C. remain the same

D. rise

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X-rays are

A. deflected by electric field

B. deflected by magnetic field

C. slightly deflected by electric field and magnetic field

D. not deflected by electric and magnetic fields

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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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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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The atmosphere gets heated up mainly by

A. direct sun's rays

B. radiation from earth's surface

C. radiogenic heat (resulting from radioactive decay)

D. cosmic rays coming from space

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The principle of equivalence of mass and energy was established by

A. Dalton

B. Rutherford

C. Einstein

D. Planck

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Every action has an equal and opposite reaction is Newton's law of Motion

A. first

B. second

C. third

D. fourth

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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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Holography is the technique of

A. taking photos of various objects

B. recording and reproducing three dimensional images

C. tracing out planets and stars in the sky

D. transmitting light waves

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Electron-volt is a unit of

A. power

B. velocity

C. energy widely used in nuclear physics

D. number of electrons

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The colour of a star is an indication of its

A. distance from the earth

B. age

C. temperature

D. size

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A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it lose heat?

A. conduction and convection only

B. conduction and radiation only

C. convection and radiation only

D. conduction, convection and radiation

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Nichrome is used in electric heaters and irons because

A. it resists oxidation when red hot

B. its melting point is high

C. it has got 60 times the resistance of copper

D. All the above

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In an electrical circuit, a fuse is connected

A. in the live wire

B. in the neutral wire

C. in the earth wire

D. anywhere

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The coil of an electric heater is made of

A. Platinum

B. Tungsten

C. Nichrome

D. Copper

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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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A body has fallen from a height. Just before touching the pound it has

A. lost all its potential energy and gained an equivalent amount of kinetic energy

B. gained potential energy and lost kinetic energy

C. gained kinetic energy as well as potential energy

D. lost kinetic energy as well as potential energy

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Mercury does not stick to glass because

A. cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules

B. the adhesive forces between mercury and glass molecules are greater than the cohesive forces

C. both the cohesive and adhesive forces are equal

D. None of the above

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When a ship floats on water, the weight or water displaced is

A. an indeterminate quantity

B. equal to the weight of the ship

C. greater than the weight of the ship

D. less than the weight of the ship

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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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It is easier to climb down a staircase than climb up because in climbing down

A. work is done against gravity

B. the steepness of the staircase isn't felt

C. gravity assists

D. there is no friction between the legs and steps

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The force that keeps a body in a circular motion la called

A. the centripetal force

B. the centrifugal force

C. the frictional force

D. All the above

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When ice melts, Its volume

A. decreases

B. increases

C. remains the same until all the ice has melted and then increases

D. remains the same