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Current Affairs January 2024

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4

What la 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

Correct Answer :

B. 11.2 km/ sec


Related Questions

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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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4

In a dynamo

A. mechanical energy is converted to light energy

B. mechanical energy is converted to heat energy

C. mechanical energy is converted to electrical energy

D. electrical energy is converted to mechanical energy

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4

Solar radiation is preferred to other sources of energy because

A. it is practically inexhaustible

B. it is the cheapest form of energy

C. it does not cause pollution

D. All of the above

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4

The planet that moves fastest around the sun is

A. Mars

B. Venus

C. Earth

D. Mercury

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Which of the following apparatus is used in the electrolysis of water?

A. Voltmeter

B. Voltameter

C. Ammeter

D. Potentiometer

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4

The enormous energy released in nuclear and thermonuclear reactions is due to conversion of

A. chemical energy into heat energy

B. mechanical energy into heat energy

C. protons into neutrons

D. mass into energy according to Einstein's equation

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4

In a vacuum the following three articles are dropped at the same time and from the lame height. Which will reach the ground quicker?

A. a stone

B. a piece of wood

C. a feather

D. all will reach the ground at the same time

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4

In an oil lamp, holes are provided below the chimney so that

A. necessary oxygen for burning of oil may be provided

B. the convection current of air may be maintained to keep the lamp burning

C. the brightness of the lamp may be increased

D. All the above

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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

The mass number and the atomic number of an element are X and Y respectively. The number oC neutrons in the atom of that element is

A. X

B. Y

C. X + Y

D. X Y

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4

In a concert hall reverberation is controlled by

A. reduction of seating capacity in the hall

B. increase of sound intensity in the hall

C. lining the walls, with leather panels put on over a layer of sound absorbent glass fibre

D. by opening the doors and windows of concert hall

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4

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 mixing up of two gases as a result of random motion of molecules is called

A. diffusion

B. effusion

C. vaporisation

D. sublimation

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4

Which of the following is not electromagnetic waves?

A. heat waves

B. sound waves

C. radio waves

D. light waves

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4

In a vacuum the following three articles are dropped at the same time and from the lame height. Which will reach the ground quicker?

A. a stone

B. a piece of wood

C. a feather

D. all will reach the ground at the same time

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4

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

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4

The planet that spins Caster than any other planet is

A. Saturn

B. Jupiter

C. Earth

D. Mercury

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4

The device that is used to measure the electromotive force of a cell is

A. an ammeter

B. a rheostat

C. a voltmeter

D. a voltameter

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4

To concentrate light on the defective teeth, the dentists use

A. convex mirrors

B. concave mirrors

C. convex lens

D. concave lens

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4

Cyclotron is an apparatus used

A. as an accelerator for imparting energies to charged particles of atomic magnitudes

B. to reduce the charge on a particle

C. to produce intense magnetic field

D. to produce intense electrical field

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4

The mass number and the atomic number of an element are X and Y respectively. The number oC neutrons in the atom of that element is

A. X

B. Y

C. X + Y

D. X Y

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4

A hydraulic brake in an automobile uses

A. a fluid to transmit the braking force

B. the force applied by the driver

C. hydrogen gas and not any liquid

D. a vacuum brake

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4

A light year means

A. a unit of time

B. a unit of length

C. a year of no consequence

D. illumination throughout the year

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4

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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4

Meteors

A. look like falling stars

B. are really pieces of rock or metal

C. burn up as they shoot through the air

D. All the above

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4

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 heat generated in a conductor carrying current is proportional to

A. the resistance

B. the square of the current flowing through it

C. the time the current flows

D. All the above

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4

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

In a microphone

A. sound energy is converted into electrical energy

B. electrical energy is converted into sound energy

C. sound energy is converted into mechanical energy

D. mechanical energy is converted into sound energy

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4

A lightning conductor installed in a building

A. does not allow the lightning to fall on the building at all

B. drives away the charged clouds

C. forces the lightning to fall on other buildings near that building

D. conducts the electric charges to the ground when lightning strikes the building