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Current Affairs January 2024

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4

No current will flow between two charged bodies if they have the same

A. resistance

B. charge

C. potential

D. charge/potential ratio

Correct Answer :

C. potential


Related Questions

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Under similar conditions of temperature and pressure, the velocity of sound is maximum in

A. helium

B. argon

C. hydrogen

D. oxygen

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When an electric apparatus is fitted with a three core flexible lead the insulation on the three wires is distinctively coloured. The present international convention is

A. brown for earth, yellow for live, light blue for neutral

B. green for earth, yellow for live, brown for neutral

C. yellow for earth, green for live, brown for neutral

D. brown or red for live, light blue or black for neutral and green or yellow for earth

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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 stationary elevated object has

A. kinetic energy

B. potential energy

C. momentum

D. both potential and kinetic energy

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At what temperature do the Fahrenheit and Kelvin scales give the same reading?

A. 212°

B. 32°

C. -40°

D.

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When the disturbed electrons of an exited atom transfer back into lower energy levels they emit energy in the form of electromagnetic wave pulses called

A. neutrons

B. electrons

C. phonons

D. photons

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4

When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of

A. surface tension

B. capillarity

C. viscosity

D. diffusion

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4

Acoustics is a property or

A. Physics

B. Chemistry

C. Biology

D. Economic

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4

The instrument used to measure atmospheric pressure is

A. Pyrometer

B. Eudiometer

C. Barometer

D. Hydrometer

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4

The red colour of the setting sun is due to

A. the least scattered red colour reaching the eye

B. the dispersion of sun light occurred in air molecule in atmosphere

C. the diffraction of sunrays in atmospheric layers

D. interference of all the rays coming from the sun

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4

Which of the following rays has the highest penetrative power?

A. �± -rays

B. �² -rays

C. �³ -rays

D. X-rays

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4

Besides protons, the nucleus of an atom contains

A. electrons

B. neutrons

C. neutrons and electrons

D. electrons, neutrons and other particles

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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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X-rays are used

A. in hospital in the treatment of malignant growth

B. to reveal hidden flaws in metal castings and welded joints

C. to detect alterations made in works of art

D. All the above

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Expansion of a rod when heated

A. is proportional to its original length

B. is proportional to the increase of temperature

C. is inversely proportional to its original length

D. Both (a) and (b) above

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4

Changing of one element into another element is known as

A. transmutation

B. fission

C. fusion

D. radioactivity

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The principle of equivalence of mass and energy was established by

A. Dalton

B. Rutherford

C. Einstein

D. Planck

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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 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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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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4

When the earth reaches its perihelion

A. it is nearest to the moon

B. it is nearest to the sun

C. it is nearest to Pluto

D. it is farthest from the sun

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Stars twinkle because of

A. refraction of light from them through air

B. reflection

C. absorption

D. All the above

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The force that keeps a body in a circular motion is called

A. the centripetal force

B. the centrifugal force

C. the frictional force

D. All the above

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Which of the following has the highest refractive index?

A. Crown glass

B. Water

C. Flint glass

D. Diamond

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Resistance is measured in

A. Volts

B. Amperes

C. ohms

D. coulombs

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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

To get 5 images of a single object one should have two plane mirrors inclined at an angle of

A. 72°

B. 60°

C. 36°

D. 90°

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4

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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4

Besides protons, the nucleus of an atom contains

A. electrons

B. neutrons

C. neutrons and electrons

D. electrons, neutrons and other particles

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4

When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is

A. the violet ray

B. the red ray

C. the green ray

D. the blue ray