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Current Affairs January 2024

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4

Air pressure is usually highest when the air is

A. warm and moist

B. cool and dry

C. warm and dry

D. cool and moist

Correct Answer :

D. cool and moist


Related Questions

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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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When we sweat, we feel comfortable under a fan because

A. the air circulated by the fan is cool

B. the fan produces convection currents of air

C. the air circulated by the fan quickens the evaporation of the moisture on our skin

D. the air takes away the heat from our body

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4

When a steel ball is placed on the surface of mercury, it does not sink because

A. of the surface tension of mercury

B. mercury is a semi-solid

C. of the high viscosity of mercury

D. the density of mercury is greater than that of steel

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4

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

Which of the following has the highest refractive index?

A. Crown glass

B. Water

C. Flint glass

D. Diamond

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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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4

What is the minimum velocity required for a rocket to overcome earth's gravity and travel into space?

A. 18 km/sec

B. 11.2 km/ sec

C. 21 km/ sec

D. 35 km/ sec

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4

Gamma radiations are used for

A. sterilising food stuff

B. controlling pests

C. cancer therapy

D. All of these

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4

An electric kettle used for boiling hard water has a white scale deposited on its heating element. This consists or

A. sugar

B. sodium carbonate

C. common salt

D. carbonates of calcium and magnesium

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4

Air pressure is usually highest when the air is

A. warm and moist

B. cool and dry

C. warm and dry

D. cool and moist

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4

The frequency of an ultrasonic wave is

A. the same as that of an audible sound

B. above the audible range

C. below the audible range

D. None of the above

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Sound waves In 'air travel faster if

A. frequency is higher

B. wavelength is smaller

C. pitch is smaller

D. air is warmer

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4

The largest planet in the solar system is

A. Neptune

B. Uranus

C. Jupiter

D. Saturn

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The distance between two bodies is halved. Now the force of attraction between them will be

A. half

B. one fourth

C. four times

D. two times

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Which of the following is fissionable?

A. U-234

B. U-235

C. U-238

D. Both (b) and (c)

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Nuclear fission process means

A. absorption of a neutron by a nucleus

B. breakup of the nucleus of a heavy atom into two nearly equal halves emitting two or three neutrons and releasing large amounts of nuclear energy in the process

C. the scattering of neutrons

D. formation of heavier nucleus

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Sound waves

A. are electromagnetic waves

B. can easily pass through vacuum

C. are always transverse waves

D. require a material medium for propagation

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4

The theory that the earth constituted the centre of the universe around which the sun and the planets revolved was propounded by

A. Copernicus

B. Ptolemy

C. Newton

D. Kepler

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4

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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When ice just melts

A. there is no change in volume

B. there is no change in temperature

C. heat is given out

D. there is no change of state

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When light passes from air to glass, its velocity in glass

A. increases

B. decreases

C. remains unchanged

D. first decreases then increases

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4

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

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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4

Photo-electric cells convert

A. electrical energy into light energy

B. light energy into electrical energy

C. light energy into heat energy

D. electrical energy into heat energy

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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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4

The image of an object formed on the retina of the eye is

A. virtual and upright

B. virtual and inverted

C. real and inverted

D. real and upright

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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 image of an object formed in a plane mirror

A. is real

B. is virtual

C. can be obtained on a screen

D. is slightly bigger than the object

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Two tumblers stuck together can be separated by

A. pouring ice cold water into the inner tumbler

B. pouring ice cold water on the outer tumbler

C. pouring hot water into the inner tumbler

D. dipping both the tumblers in hot water

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A man weighing 50 kg floats on water in a lake. His apparent weight is

A. 50 kg

B. 45 kg

C. zero

D. 150 kg