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Current Affairs January 2024

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4

A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

A. the floor and carpet are at different temperatures

B. the stone conveys the heat away from the feet more rapidly than the carpet

C. the carpet is a better conductor of heat than the stone

D. the human body maintains a constant temperature

Correct Answer :

B. the stone conveys the heat away from the feet more rapidly than the carpet


Related Questions

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4

The brightest star visible to the naked eye is

A. Sirius

B. Vega

C. Rigel

D. Proxima Centauri

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The Cact that the compass needle does not point true north was observed first by

A. Sir Isaac Newton

B. Columbus

C. Archimedes

D. Thomas Alva Edison

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4

In the nucleus of an atom, the uncharged particle is

A. proton

B. neutron

C. electron

D. positron

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The line on earth's surface passing through the places having zero dip is called the magnetic equator. This passes through

A. Thumba

B. Delhi

C. Mumbai

D. Sriharikota

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Resistance is measured in

A. Volts

B. Amperes

C. ohms

D. coulombs

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4

Acoustics is a property or

A. Physics

B. Chemistry

C. Biology

D. Economic

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The hydraulic jack to lift heavy vehicles in automobile service stations is one of the applications of

A. Pascal's law

B. Principle of Archimedes

C. Boyle's law

D. Hooke's law

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4

The earth's nearest neighbour in space is

A. the Sun

B. the Moon

C. the Venus

D. the Mars

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A simple mercury barometer is found in a slightly slanting position. The atmospheric pressure

A. is found by measuring the slanting height of the mercury column

B. is given by the vertical height

C. cannot be measured with it

D. can be measured by both the methods described above

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4

Echoes are produced by

A. the reflection of sound waves

B. the refraction of sound waves

C. the interference of sound waves

D. reverberation of sound waves

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4

Bats flying in the dark avoid obstacles because

A. they can see very dearly only in darkness

B. they produce ultrasonic waves which guide them

C. their eyes are sensitive to darkness

D. their eye holes expand in darkness

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4

To produce beats it is necessary to have two waves

A. travelling in opposite direction

B. of slightly different frequencies

C. of equal wavelength

D. of equal amplitude

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4

A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will

A. increase

B. decrease

C. remain the same

D. first decrease and then increase

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4

Which of the following is fissionable?

A. U-234

B. U-235

C. U-238

D. Both (b) and (c)

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4

The SI unit of electric current is

A. the ampere

B. the volt

C. the ohm

D. the coulomb

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In a concert hall reverberation is controlled by

A. reduction of seating capacity in the hall

B. increase of sound intensity in the hall

C. lining the walls, with leather panels put on over a layer of sound absorbent glass fibre

D. by opening the doors and windows of concert hall

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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

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4

To produce beats it is necessary to have two waves

A. travelling in opposite direction

B. of slightly different frequencies

C. of equal wavelength

D. of equal amplitude

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4

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

A. 212°

B. 32°

C. -40°

D.

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When a bowler spins a ball, it changes its direction in the air. This is due to

A. turbulence caused by the wind

B. buoyancy of air

C. unequal pressures acting on it

D. sudden change in the direction of the wind

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4

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

A. Parabolic

B. Convex

C. Concave

D. Plain

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4

What la the minimum velocity required for a rocket to overcome earth's gravity and travel into space?

A. 18 km/sec

B. 11.2 km/ sec

C. 21 km/ sec

D. 35 km/ sec

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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

Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water

A. increases to a great extent

B. increases slightly

C. decreases slightly

D. decreases rapidly

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4

The overhead wires supported by high towers in the grid system carry

A. alternating current of very high frequency

B. alternating current of very high voltage

C. a very large direct current

D. a high voltage direct current

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4

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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4

The phenomenon of radioactivity was discovered by

A. Rutherford

B. Bohr

C. Henri Bacquerel

D. Marie Curie

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The transistor was invented by

A. Marconi

B. Baird

C. John Bardeen, Walter H. Brattain and William Shockley

D. Edison

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The heat generated in a conductor carrying current is proportional to

A. the resistance

B. the square of the current flowing through it

C. the time the current flows

D. All the above

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4

The largest planet in the solar system is

A. Neptune

B. Uranus

C. Jupiter

D. Saturn