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Current Affairs January 2024

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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

Correct Answer :

C. superconductors


Related Questions

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4

The plants in a greenhouse are enclosed in a glass enclosure because

A. glass allows the heat radiations of shorter wavelengths from the sun to pass through

B. the plants absorb them - these shorter wavelengths - and reradiate them in the form of longer wavelengths

C. the longer wavelengths cannot penetrate through the glass walls

D. All the above

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4

A thermostat is a device used

A. for automatically maintaining a steady temperature

B. for measuring electricity

C. to reduce the voltage of electricity

D. for producing heat

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4

When a satellite la In a geostationary orbit the force keeping it in orbit Is

A. zero

B. the centrifugal force

C. reaction due to steady burning of fuel

D. the gravitational pull on the body by the earth is the weight of the body which provides the centripetal force

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4

The temperature of a large bucket-full of hot water (a few degrees below boiling point) is lower than a beaker full of boiling water. But

A. the hot water contains a much larger quantity of internal energy than the boiling water

B. the boiling water contains more quantity of internal energy than the warm water

C. both of them have got the same amount of internal energy.

D. nothing can be said definitely with the data given

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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

We cannot see and without the aid of a telescope

A. Neptune and Pluto

B. Jupiter and Saturn

C. Venus and Mars

D. Venus and Saturn

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4

The unit of heat energy is

A. watt

B. degree

C. joule

D. erg

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4

Choose the scalar quantity from the following physical quantities

A. force

B. velocity

C. acceleration

D. speed

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4

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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4

The earth satellite Aryabhatta was put in orbit by India on

A. October 20, 1978

B. November 14, 1978

C. January 26, 1979

D. April 19, 1975

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4

X-rays were discovered by

A. Wilhelm Roentgen

B. WO Coolidge

C. Henry Cavendish

D. William Watson

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4

Of the following types of electromagnetic radiation which has the longest wavelength?

A. ultraviolet rays

B. gamma rays

C. radio waves

D. infrared waves

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4

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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4

Primary colours are

A. colours of the rainbow

B. colours in the spectrum of white light

C. colours which cannot be produced by mixing other colours

D. colours found in nature

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4

A lightning conductor installed in a building

A. does not allow the lightning to fall on the building at all

B. drives away the charged clouds

C. forces the lightning to fall on other buildings near that building

D. conducts the electric charges to the ground when lightning strikes the building

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4

A piece of cork is embedded inside an ice block which floats in water. What will happen to the level of water when all ice melts?

A. It will go down

B. It will come up

C. It will remain at the same level

D. First it will go down and it will come up

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4

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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4

Which of the following rays has the highest penetrative power?

A. a -rays

B. � -rays

C. ? -rays

D. X-rays

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4

The acoustical quality of a room depends on

A. the size and shape of the room

B. the ability of the ceiling, walls and floor to exclude unwanted sound

C. the use of furnishings made of sound absorbing materials

D. All the above

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4

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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4

The instrument used to determine the RD (Relative Density) of a liquid by the principle of floatation is

A. Hygrometer

B. Hypsometer

C. Hydrometer

D. Densimeter

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4

When are temperature resistance

A. increases

B. decreases

C. remains the same

D. first increases then decreases

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4

When a body is projected upwards

A. the time for the upward journey and downward journey are the same

B. the upward journey takes more time

C. the downward journey takes more time

D. Cant be said

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4

The force of attraction or repulsion between two charged bodies is directly proportional to the product of the charges and inversely proportional to the square of distance between them. This was propounded by

A. Coulomb

B. Gilbert

C. Volta

D. Rutherford

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4

In a longitudinal wave, the direction of propagation of the wave is

A. the same as the direction of the vibrations of the vibrating body

B. at right angles to the direction of the vibrations of the vibrating body

C. Both (a) and (b) above

D. None of the above

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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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4

Stars twinkle because of

A. refraction of light from them through air

B. reflection

C. absorption

D. All the above

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4

The scientist who first sent electromagnetic waves to distant places was

A. James Clerk Maxwell

B. Heinrich Hertz

C. Thomas Alva Edison

D. Baird

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The device for tracking and locating the position of a moving object in space is called

A. Space ship

B. Lunar module

C. Radar

D. Rocket

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An ohm is a unit of

A. potential difference

B. resistance

C. current

D. All the above