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Current Affairs January 2024

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4

A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is

A. greater than the weight of the man

B. less than the weight of the man

C. same as the weight of the man

D. zero

Correct Answer :

A. greater than the weight of the man


Related Questions

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A lactometer la used to

A. find out the specific gravity of liquids

B. measure the volumes of liquids

C. test the purity of milk

D. determine the strength of acid in car batteries

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A nuclear reactor is said to have become 'critical' when

A. it stops due to malfunctioning

B. it starts emitting dangerous radioactive radiations

C. it is shut down to avoid explosion

D. it is ready to produce controlled energy

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4

At temperature near OK, (zero kelvin) metals such as lead and tin become

A. insulators

B. semiconductors

C. superconductors

D. condenser

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The instrument used to measure atmospheric pressure is

A. Pyrometer

B. Eudiometer

C. Barometer

D. Hydrometer

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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

A wire conveying a current deflects a pivoted magnetic needle. This was discovered by

A. Marconi

B. Oersted

C. Faraday

D. Ohm

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If an object is placed between two parallel plane mirrors, the number of images formed will be

A. 1

B. infinite

C. 0

D. 4

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

A. 212°

B. 32°

C. -40°

D.

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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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The electroplating of a metallic article

A. protects the article from atmospheric corrosion

B. gives it a more attractive appearance

C. Both (a) and (b) above

D. None of the above

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4

At temperature near OK, (zero kelvin) metals such as lead and tin become

A. insulators

B. semiconductors

C. superconductors

D. condenser

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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 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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Heat is transmitted from one end of a metal rod to its other end by the method of

A. conduction

B. convection

C. radiation

D. sublimation

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The world's first artificial satellite Sputnik I was launched by Russia in

A. 1985

B. 1957

C. 1959

D. 1960

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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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To concentrate light on the defective teeth, the dentists use

A. convex mirrors

B. concave mirrors

C. convex lens

D. concave lens

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When a body Is taken to the poles from the equator, Its weight becomes

A. greater

B. less

C. the same

D. None of these

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An integrated circuit is 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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Changing of one element into another element is known as

A. transmutation

B. fission

C. fusion

D. radioactivity

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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

Solids have definite shapes. This is because

A. the forces of cohesion of the molecules within are very much less in them

B. the forces of cohesion are very large

C. the forces of adhesion are large

D. the forces of adhesion are less

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4

The cover of a solar cooker is made of glass because

A. it absorbs sun's rays

B. it reflects sun's rays

C. it retains the heat inside by the greenhouse effect

D. it radiates heat better than metals

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4

The speed of sound in a medium depends upon the properties of the medium such as

A. its density

B. its temperature

C. its elasticity

D. All the above

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The maximum range of most TV signals is from 121 to 240 km only because

A. the curvature of earth limits the range of reception

B. the signals are weak

C. the signals are absorbed by air

D. the antennae are not powerful enough

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4

A car parked in the sun with its windows closed gets terribly hot inside. This is due to

A. the heat emitted by the engine

B. the greenhouse effect

C. the good conducting power of the metal body

D. the double layered wind shield

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When ice just melts

A. there is no change in volume

B. there is no change in temperature

C. heat is given out

D. there is no change of state

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Which force is used when milk is churned to separate cream?

A. cohesive

B. centrifugal

C. frictional

D. gravitational

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In compact porous soil, the rising of the water is due to

A. capillarity

B. cohesion

C. adhesion

D. viscosity

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The spectrum of white light can be studied by

A. a microscope

B. a telescope

C. a stereoscope

D. a spectroscope