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Current Affairs January 2024

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

A. Parabolic

B. Convex

C. Concave

D. Plain

Correct Answer :

B. Convex


Related Questions

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The rings of Saturn were discovered by

A. Galileo

B. Bhaskara

C. Aryabhatta

D. Ptolemy

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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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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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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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When a charged rod is brought near a collection of small pith balls, the balls

A. will jump rapidly up and down for a short time

B. will remain unaffected

C. Both (a) and (b) above

D. It will produce electric shock

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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

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 sensitive instrument susceptible to magnetic infiuence can be protected from external magnetic field by

A. enclosing it in a thick walled iron box

B. wrapping it with an insulator

C. by placing it inside a glass case

D. by surrounding it with fine copper gauze

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Skating on ice is possible because

A. the surface of ice is smooth

B. ice is cold

C. the pressure on the ice due to skate melts the ice by lowering its melting point forming a thin film of water

D. the pressure on the ice due to skate raises its melting point

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Heat transfer

A. cools the body that transfers it

B. heats the body that absorbs the heat

C. may change the physical state of the substance

D. All the above

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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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Formation of shadows can be explained by

A. rectilinear propagation of light

B. reflection

C. refraction

D. total internal reflection

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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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A small bubble of air deep down in a lake rises up to the top of the lake. The volume of the bubble on coming up will

A. increase

B. decrease

C. will not change

D. first increase and then decrease

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The force that keeps a body in a circular motion is called

A. the centripetal force

B. the centrifugal force

C. the frictional force

D. All the above

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Separating particles from a suspension is effected by

A. centrifugal force

B. frictional force

C. gravitational force

D. distillation

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The Indian Space Research Organisation (ISRO) is located at

A. Thumba

B. Bangalore

C. Ahmedabad

D. New Delhi

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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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Separating particles from a suspension is effected by

A. centrifugal force

B. frictional force

C. gravitational force

D. distillation

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X-rays are used

A. in hospital in the treatment of malignant growth

B. to reveal hidden flaws in metal castings and welded joints

C. to detect alterations made in works of art

D. All the above

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When an incident beam of light strikes the surface of a glass slab normally, the refracted beam

A. goes straight through without bending

B. gets deviated away from the normal

C. gets bent towards the normal

D. gets reflected

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Increase in pressure

A. increases the melting point of ice

B. decreases the melting point of ice

C. has no effect on the melting point of ice

D. increases the volume of the ice

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For viewing objects placed at a higher level from a position at a lower level, the instrument used' Is known aa

A. telescope

B. spectrometer

C. microscope

D. periscope

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X-rays are used

A. in hospital in the treatment of malignant growth

B. to reveal hidden flaws in metal castings and welded joints

C. to detect alterations made in works of art

D. All the above

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4

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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Velocity of sound in high altitudes is low because at such a height

A. the temperature is low

B. there is no air

C. the pressure is low

D. All the above

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The instrument used to measure the strength of electric current at a point is

A. Ammeter

B. Altimeter

C. Adrinometer

D. Anemometer

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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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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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For accurate scientific work, temperatures are often measured by

A. mercury thermometers

B. alcohol thermometers

C. platinum resistance thermometers

D. thermoelectric thermometers