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Current Affairs January 2024

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The sun continuously produces an enormous amount of energy. This la due to

A. nuclear fission

B. nuclear fusion

C. chemical combustion

D. boiling

Correct Answer :

B. nuclear fusion


Related Questions

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The ozone layer absorbs

A. Cosmic rays

B. Infrared rays

C. All radiations of light

D. Ultra violet rays coming from the sun

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At what temperature do the Fahrenheit and Kelvin scales give the same reading?

A. 212°

B. 32°

C. -40°

D.

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The function of a ruse wire is

A. to stabilise the voltage

B. to decrease the current supply

C. to increase the current supply

D. to prevent an unduly high current from passing through a circuit

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4

In the fuse of an electrical installation blows out

A. replace the fuse by a thin wire

B. replace the fuse by a thick copper wire

C. replace the fuse by a fuse wire of proper rating

D. replace the fuse by nichrome wire

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Pyrometers are instruments used

A. for measuring the velocity of wind

B. in the manufacture of fireworks

C. in finding the coefficient of apparent expansion of a liquid

D. for measuring high temperatures

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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

Red Light is used as a dancer signal because

A. it is pleasing to the eye

B. it has a traditional colour

C. it is easily distinguishable

D. it is most sensitive to the human eye

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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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The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by

A. Bernoulli's principle

B. Magnetic properties of the ship's material

C. Newton's third law of motion

D. Earth's gravitational force

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A heavenly body similar in nature to the sun intensely hot glowing mass that produces its energy by thermonuclear reactions is

A. a planet

B. a meteor

C. a star

D. a comet

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You want a supply of a small but constant current. Which of the following cells will you prefer?

A. Daniell cell

B. Leclanche cell

C. Dry cell

D. All the above

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4

When a body is immersed in a fluid the force of buoyancy of the fluid on the body depends on

A. the immersed volume of the body

B. density of the liquid

C. acceleration due to the gravity at the place

D. All the above

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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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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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A bullet is fired at a certain angle with the horizontal. Its path will be

A. elliptical

B. a straight line

C. a parabola

D. a vertical line

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When sound waves travel from one medium to another, the quantity which remains unchanged is its

A. speed

B. frequency

C. wavelength

D. All the above

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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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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 aneroid barometer uses

A. mercury

B. distilled water

C. alcohol

D. does not use any liquid

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In hot climatic conditions, the buildings are painted white because

A. white paint is economical

B. it does not fade off

C. it does not crack with higher temperature

D. white coating is a bad conductor of heat and reflects heat rays that fall on it, thus keeping the inside cool

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The presence of impurities

A. lowers the melting point of ice

B. raises the melting point of ice

C. has no effect on the melting point of ice

D. may lower or raise the melting point depending upon the type of impurities

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4

The body of an electrical appliance is earthed in order that

A. electricity may not leak

B. there may be smooth flow of electricity

C. a short circuit may be prevented

D. current may pass to the earth in case of a short circuit without doing any harm to the person

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An electric fan converts

A. electrical energy into heat energy

B. electrical energy into mechanical energy

C. mechanical energy into electrical energy

D. mechanical energy into heat energy

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Commonly used safety fuse wire is made of

A. Tin

B. Lead

C. Nickel

D. An alloy of tin and lead

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Frictional force acts in

A. the same direction as the motion

B. the opposite direction of the motion

C. all the directions

D. upward direction

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Which mirror is used as a rear view mirror in Vehicles?

A. Parabolic

B. Convex

C. Concave

D. Plain

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The Space Application Centre for training in Satellite Communication Technology is located at

A. Bangalore

B. Mumbai

C. Ahmedabad

D. New Delhi

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Gamma radiations are used for

A. sterilising food stuff

B. controlling pests

C. cancer therapy

D. All of these

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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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The number of electrons in the outer orbits of a nucleus gives

A. the mass number

B. atomic number

C. atomic weight

D. absolute number