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Current Affairs January 2024

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4

Mercury is used in a barometer because

A. its density being very high 13.6 g/cm3 the height of mercury column is conveniently small

B. at the ordinary temperature its vapour pressure is small

C. it is opaque and does not wet glass

D. All the above

Correct Answer :

D. All the above


Related Questions

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When the resistance of a circuit increases the current will

A. increase

B. decrease

C. remain the same

D. None of the above

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4

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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4

A device used in a ship for the purpose of measuring the depth of the sea is

A. an altimeter

B. a fathometer

C. a hydrometer

D. a sonometer

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4

If the speed of the rotation of the earth increases the weight of a body

A. will increase

B. will decrease

C. will have no change

D. will either increase or decrease

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4

The base of an electric iron is brightly polished mainly

A. to make it smooth and frictionless

B. to make it rust - proof

C. to reduce heat loss by radiation

D. to make it more durable

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4

The ballistic missile, Agni 11, tested by India has a maximum range of

A. 1000 km

B. 1500 km

C. 2000 km

D. 500 km

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A cup of hot coffee is placed on a metal table in a room. By which of the following methods does it lose heat?

A. conduction and convection only

B. conduction and radiation only

C. convection and radiation only

D. conduction, convection and radiation

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4

The colour of the light which travels through glass with minimum speed is

A. red

B. violet

C. green

D. yellow

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The minimum velocity required by a satellite to escape earth's gravitational pull is

A. 18 km/s

B. 11.2 km /s

C. 21 km/s

D. 35 km/s

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4

The power of a lens is

A. equal to its focal length

B. equal to its radius of curvature

C. equal to the reciprocal of its focal length (in metres)

D. equal to twice its focal length

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4

If a man wants to hear clearly the echo of a sound produced by him from a hill, the hill should be away from him by a minimum distance of

A. 330 m

B. 33 m

C. 16.5 m

D. 165 m

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4

The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by

A. Bernoulli's principle

B. Magnetic properties of the ship's material

C. Newton's third law of motion

D. Earth's gravitational force

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4

The electron has a mass equal to

A. 1.9 x 10-13 kg

B. 9.1 x 10-31 kg

C. 1 x 10-15 kg

D. 1.6 x 10-19 kg

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4

The tiniest of the stars belong to the group known as

A. Giant stars

B. White Dwarf stars

C. Neutron stars

D. Super-giant stars

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The air inside an electric, bulb is removed to prevent

A. oxidation of the tungsten filament

B. bursting of the bulb

C. loss of light due to absorption

D. keeping the weight of the bulb less

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4

Metals are good conductors of heat because

A. they contain free electrons

B. their atoms are relatively far apart

C. their atoms collide frequently

D. they have reflecting surfaces

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4

The difference between planets and stars is

A. planets do not have light of their own whereas stars shine by their own light

B. planets do not twinkle like stars

C. planets are much smaller than stars

D. All the above

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The leader of the team who succeeded in constructing the first nuclear reactor (an atomic pile) in the world was

A. Albert Einstein

B. Enrico Fermi

C. HJ Bhabha

D. Sir Isaac Newton

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Solids have definite shapes. This is because

A. the forces of cohesion of the molecules within are very much less in them

B. the forces of cohesion are very large

C. the forces of adhesion are large

D. the forces of adhesion are less

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4

Increase in pressure

A. has no effect on the boiling point of a liquid

B. raises the boiling point of a liquid

C. lowers the boiling point of a liquid

D. increases the volume of a liquid

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4

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

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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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

The strength of an electromagnet can be increased by

A. increasing the length of the coiled wire

B. increasing current supply

C. increasing the size of the iron core

D. All the above

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A ruse wire is characterised by

A. high resistance and high melting point

B. high resistance and low melting point

C. low resistance and high melting point

D. low resistance and low melting point

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The inability of a body to change its state of rest or uniform motion along a straight line is called its

A. momentum

B. velocity

C. acceleration

D. inertia

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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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Pieces of camphor placed on water move about rapidly. This is because of

A. diffusion

B. viscosity

C. surface tension

D. capillarity

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On the Kelvin scale, the melting point of ice is

A. 0 K

B. 273 K

C. 373 K

D. 100 K

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The barometer was invented by

A. Michael Faraday

B. Torricelli

C. Thomas Alva Edison

D. Benjamin Franklin