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Current Affairs January 2024

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4

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

Correct Answer :

A. so that they may reflect thermal radiation from outside and minimise such radiation from them


Related Questions

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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

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The rate of cooling of a hot body depends on

A. the nature of the radiating surface

B. area of the radiating surface

C. temperature difference between the body and the surroundings

D. All the above

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4

A rheostat is used

A. to increase the current flow in a circuit

B. to decrease the current flow

C. to measure the flow of electric current

D. Either (a) or (b) above

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4

Match the following:
A. Anemometer1. Measurement of power
B. Tachometer2. Wind speed
C. Dynamometer3. Revolutions per minute
D. Barometer4. Atmospheric pressure
*5. Current from a dynamo

A. A-1 B-3 C-5 D-4

B. A-2 B-1 C-3 D-4

C. A-2 B-3 C-1 D-4

D. A-1 B-3 C-5 D-2

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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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4

The period of a geostationary (synchronous) satellite orbiting the earth over the equator la

A. 16 hours

B. 12 hours

C. 20 hours

D. 24 hours

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A ship sailing from a river to the sea

A. sinks less in the sea

B. sinks more in the sea

C. neither sinks more nor less in the sea

D. sinking more or less depends on sea

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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

Mica is used in an electric iron because it is a

A. good conductor of heat

B. good conductor of electricity

C. bad conductor of electricity

D. Both (a) and (b) above

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4

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 unit of heat energy is

A. watt

B. degree

C. joule

D. erg

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In very cold countries alcohol is used as a thermometric liquid because

A. alcohol is a poor conductor of heat

B. alcohol can be coloured for its level to be seen easily

C. its freezing point is very low

D. it will not stick to the glass tube

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4

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 proton is

A. a quantum of light energy

B. a quantum of matter

C. a positively charged atomic particle

D. another name for positron

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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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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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4

The principle on which a Jet engine works is

A. conservation of mass

B. Newtonian law of action and reaction

C. conservation of angular momentum

D. None of the above

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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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In a hydraulic pressure

A. force on each square centimetre of the small piston is less than the force on each square centimetre of the large piston

B. the distance the small piston moves is equal to the distance the large piston moves

C. applied pressure is equally transmitted throughout the liquid in all directions

D. force acting on small piston is equal to the force acting on large piston

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The radius of curvature of a spherical mirror is

A. equal to half its focal length

B. equal to its focal length

C. twice its focal length

D. not related to its focal length

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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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Expansion of a rod when heated

A. is proportional to its original length

B. is proportional to the increase of temperature

C. is inversely proportional to its original length

D. Both (a) and (b) above

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Of the following which has got the highest frequency?

A. ultraviolet rays

B. gamma rays

C. radio waves

D. infrared waves

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In the ramous equation of Einstein E = mc2 , 'c' denotes.

A. velocity of sound

B. velocity of light

C. a constant factor

D. wavelength of light

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Pyrometers are instruments used

A. for measuring the velocity of wind

B. in the manufacture of fireworks

C. in finding the coefficient of apparent expansion of a liquid

D. for measuring high temperatures

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In the case of bodies falling under gravity which of the following remains constant at a given place?

A. kinetic energy

B. potential energy

C. acceleration

D. All the above

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Warm air will hold more water vapour than cold air because

A. it is lighter

B. it has more water vapour in it

C. its molecules are close together

D. its molecules are far apart

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4

The coil of an electric heater is made of

A. Platinum

B. Tungsten

C. Nichrome

D. Copper

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The mirage is a phenomenon

A. generally considered as a desert happening

B. caused by unequal heating of the several layers of the atmosphere above the desert

C. in which the refracted rays take a curved path resulting in total internal refection

D. All the above

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Alternating Current (AC) is more advantageous than direct current because

A. it can be transmitted easily and efficiently

B. Alternating Current (AC) loses the least amount of energy when transmitted at high voltages

C. Alternating Current (AC) voltage can be easily increased or decreased

D. all the above