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Current Affairs January 2024

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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

Correct Answer :

C. platinum resistance thermometers


Related Questions

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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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4

Sound waves in air are

A. transverse

B. longitudinal

C. transverse and longitudinal

D. neither transverse nor longitudinal

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A star contains

A. about 75% of hydrogen

B. 22% helium

C. traces of most other elements including oxygen, neon, carbon and nitrogen

D. All the above

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4

In a refrigerator cooling is produced by

A. the ice that deposits on the freezer

B. the evaporation of a volatile liquid

C. None of the above

D. Both (a) and (b)

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4

When one enters a dark room after being in bright light one is not able to see anything clearly for a while because

A. the retina of the eye moves forward

B. the retina of the eye moves backward

C. c).the iris is unable to dilate the pupil immediately to be able to see things

D. the eye has no power of accommodation

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4

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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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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The cell that can be recharged, after it has run down, by passing a direct current through it from a source of current is

A. Voltaic cell

B. Leclanche cell

C. Dry cell

D. An accumulator

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4

It is more difficult to walk on ice than on a concrete road because

A. there is very little friction between the ice and feet pressing it

B. ice is soft when compared to concrete

C. there is more friction between the ice and feet

D. None of the above

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The rocket engine is motivated by jet propulsion which uses the famous

A. Kepler's Laws

B. Newtonian Third Law of Motion

C. Bernoulli's Principle

D. Law of Relativity

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Mercury is used in thermometers because

A. it has high thermal conductivity

B. it has uniform expansivity

C. it has high boiling point and low freezing point

D. of all the above

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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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A man stands on the pan of a balance holding a fish in his right hand and bucket of water in his left hand. If he transfers the fish into the bucket, the total weight on the pan

A. increases

B. decreases

C. remains the same

D. first increases and then decreases

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Formation of shadows can be explained by

A. rectilinear propagation of light

B. reflection

C. refraction

D. total internal reflection

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The SI unit of electric current is

A. the ampere

B. the volt

C. the ohm

D. the coulomb

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When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is

A. the violet ray

B. the red ray

C. the green ray

D. the blue ray

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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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The planet that moves fastest around the sun is

A. Mars

B. Venus

C. Earth

D. Mercury

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Besides protons, the nucleus of an atom contains

A. electrons

B. neutrons

C. neutrons and electrons

D. electrons, neutrons and other particles

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When we tighten the string of a sitar or tanpura its pitch

A. remains the same

B. increases

C. decreases

D. None of the above

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The phenomenon of spontaneous disintegration of certain heavy nuclei is termed

A. radioactivity

B. fission

C. fusion

D. implosion

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The brightest planet in the Solar System is

A. Jupiter

B. Mercury

C. Venus

D. Sirius

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A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

A. decreasing the radius of the capillary tube

B. increasing the radius of the capillary tube

C. increasing the height of water in the vessel

D. None of these

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4

The filament used in the electric lamp is made of

A. nichrome

B. tungsten

C. copper

D. aluminium

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Which of the following sets of elementary particles have nearly equal masses?

A. Neutron and Proton

B. Electron and Proton

C. Neutron and Electron

D. Proton, Neutron and Electron

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Galaxies emit

A. radio waves and X-rays

B. ultraviolet light waves

C. visible light waves

D. All the above

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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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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

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The numerical reading of the Fahrenheit thermometer of a given temperature

A. is proportional to that of the Celsius thermometer

B. is always greater than that of the Celsius thermometer

C. is always less than that of the Celsius thermometer

D. may be greater than or less than or equal to that of the Celsius thermometer

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The speed of light is minimum while passing through

A. air

B. glass

C. vacuum

D. water