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Current Affairs January 2024

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The scientist who first sent electromagnetic waves to distant places was

A. James Clerk Maxwell

B. Heinrich Hertz

C. Thomas Alva Edison

D. Baird

Correct Answer :

C. Thomas Alva Edison


Related Questions

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Echoes are produced by

A. the reflection of sound waves

B. the refraction of sound waves

C. the interference of sound waves

D. reverberation of sound waves

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4

A sensitive instrument susceptible to magnetic infiuence can be protected from external magnetic field by

A. enclosing it in a thick walled iron box

B. wrapping it with an insulator

C. by placing it inside a glass case

D. by surrounding it with fine copper gauze

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A proton is

A. the ionised hydrogen molecule

B. the nucleus of helium atom

C. the nucleus of hydrogen atom

D. the positive counterpart of electron

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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

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4

In a longitudinal wave, the direction of propagation of the wave is

A. the same as the direction of the vibrations of the vibrating body

B. at right angles to the direction of the vibrations of the vibrating body

C. Both (a) and (b) above

D. None of the above

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4

The resistance of a wire depends on

A. the material of the wire

B. the length of the wire

C. the cross section of the wire

D. All the above

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4

The brightest planet in the Solar System is

A. Jupiter

B. Mercury

C. Venus

D. Sirius

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When light travels from one medium to another there is a change in its

A. velocity

B. wavelength

C. frequency

D. Both (a) and (b) above

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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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When are temperature resistance

A. increases

B. decreases

C. remains the same

D. first increases then decreases

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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

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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 following are the atmospheric zones above the surface of the earth:
A) Troposphere
B) Ionosphere
C) Stratosphere
D) Exosphere
Select the correct sequence from the earth's surface on the basis of the codes given below:

A. ACBD

B. ABCD

C. CABD

D. BACD

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The speed of light is minimum while passing through

A. air

B. glass

C. vacuum

D. water

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The heat produced in a conductor due to the passage of a current through it is proportional to

A. the square of the current

B. the resistance of the conductor

C. the time for which the current flows

D. All the above

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4

The method used to separate aluminium from a alumina is

A. electroplating

B. electrotyping

C. electrolysis

D. distillation

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4

Who discovered that the Cree Call acceleration Is the same for any object at a given place?

A. Newton

B. Pascal

C. Archimedes

D. Galileo

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Frictional force acts in

A. the same direction as the motion

B. the opposite direction of the motion

C. all the directions

D. upward direction

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When temperature decreases, resistance of metals to flow of electricity

A. increases

B. decreases

C. neither increases nor decreases

D. first increases then decreases

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Photoelectric cell is a device which converts

A. light energy into electrical energy

B. electrical energy into light energy

C. magnetic energy into electrical energy

D. electrical energy into mechanical energy

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The unit of heat energy is

A. watt

B. degree

C. joule

D. erg

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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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4

The Indian Satellite System used for domestic communications, television and meteorology is known as

A. INSAT

B. Bhaskara

C. Aryabhatta

D. All the above

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4

A bullet is fired at a certain angle with the horizontal. Its path will be

A. elliptical

B. a straight line

C. a parabola

D. a vertical line

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A spherical mirror is

A. a reflecting elliptical portion

B. a reflecting spherical surface

C. a parabolic reflecting surface

D. a flat reflecting surface

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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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Heat transfer

A. cools the body that transfers it

B. heats the body that absorbs the heat

C. may change the physical state of the substance

D. All the above

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Which of the following can produce electricity?

A. resistor

B. thermocouple

C. light bulb

D. neon tube

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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 number of electrons in the outer orbits of a nucleus gives

A. the mass number

B. atomic number

C. atomic weight

D. absolute number