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Current Affairs January 2024

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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

Correct Answer :

B. 11.2 km /s


Related Questions

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4

The loudness of a sound is determined by

A. Frequency

B. Amplitude

C. Speed

D. Wavelength

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4

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

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4

In a freezer ice cubes will be formed more quickly in trays made of

A. rubber

B. plastic

C. aluminium

D. wood

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4

The acoustical quality of a room depends on

A. the size and shape of the room

B. the ability of the ceiling, walls and floor to exclude unwanted sound

C. the use of furnishings made of sound absorbing materials

D. All the above

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4

The nuclear model of atom was first visualised by

A. Rutherford

B. Neils Bohr

C. Albert Einstein

D. JJ Thompson

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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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4

The temperature, surface features, length of days and nights of a planet depend on

A. its atmosphere

B. its distance from the sun

C. its rotation

D. All the above

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4

The evaporation rate depends on

A. the nature of the liquid

B. area of the exposed surface of the liquid

C. temperature of air and of the liquid

D. All the above

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4

Rain drops acquire spherical shape due to

A. viscosity

B. surface tension

C. friction

D. elasticity

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4

We always see only one side of the moon because

A. the sun comes in between the earth and moon

B. the moon is stationary

C. the time taken by the moon to rotate on its axis is the same as the time taken by it to revolve round the earth

D. moon revolves round the sun

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4

The device used to record the sound is

A. a microphone

B. a headphone

C. a phonograph

D. an amplifier

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4

The device for tracking and locating the position of a moving object in space is called

A. Space ship

B. Lunar module

C. Radar

D. Rocket

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4

The Space Application Centre for training in Satellite Communication Technology is located at

A. Bangalore

B. Mumbai

C. Ahmedabad

D. New Delhi

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4

Cosmic rays are

A. powerful X-rays falling on the earth from space

B. ultraviolet rays from the sun

C. gamma rays from radioactive minerals

D. very energetic radiation falling upon the earth from outer space consisting chiefly of charged particles

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4

The star nearest to the sun is

A. Proxima Centauri

B. Sirius

C. Aldebaran

D. Vega

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4

The speed of sound in a medium depends upon the properties of the medium such as

A. its density

B. its temperature

C. its elasticity

D. All the above

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4

The stem of a vibrating tuning fork is pressed against a sound box. Then

A. the loudness of the sound increases

B. the loudness remains the same

C. the loudness decreases

D. the sound suddenly stops

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4

Rays similar to X-rays but of smaller wave length that are given off by radioactive substances are

A. �± -rays

B. �² -rays

C. �³ -rays

D. Cosmic rays

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4

The radiator in a car serves to

A. cool the engine

B. heat up the engine

C. start the car

D. moderate the speed

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4

Where does the centre of gravity of a rubber ring lie?

A. on the outer surface

B. in the inner surface

C. at the centre of the ring

D. None of the above

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4

A nuclear reactor is said to have become 'critical' when

A. it stops due to malfunctioning

B. it starts emitting dangerous radioactive radiations

C. it is shut down to avoid explosion

D. it is ready to produce controlled energy

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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

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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4

When a ship floats on water, the weight or water displaced is

A. an indeterminate quantity

B. equal to the weight of the ship

C. greater than the weight of the ship

D. less than the weight of the ship

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4

The image formed by a plane mirror is

A. of the same size as the object

B. at the same distance behind the mirror as the object is in front of it

C. virtual and laterally inverted

D. All the above

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4

The Solar System lies near the edge of a galaxy known as

A. The Milky Way

B. Radio Galaxy

C. Andromeda Nebula

D. Magellanic Clouds

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4

Powder clings to the skin because of

A. cohesion

B. adhesion

C. capillary action

D. absorption

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4

A pair of stars that revolve round each other is

A. a neutron star

B. a binary star

C. a dwarf star

D. a polar star

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4

The earth satellite Aryabhatta was put in orbit by India on

A. October 20, 1978

B. November 14, 1978

C. January 26, 1979

D. April 19, 1975

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4

When a bowler spins a ball, it changes its direction in the air. This is due to

A. turbulence caused by the wind

B. buoyancy of air

C. unequal pressures acting on it

D. sudden change in the direction of the wind