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Current Affairs January 2024

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The force of attraction or repulsion between two charged bodies is directly proportional to the product of the charges and inversely proportional to the square of distance between them. This was propounded by

A. Coulomb

B. Gilbert

C. Volta

D. Rutherford

Correct Answer :

A. Coulomb


Related Questions

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Holography is the technique of

A. taking photos of various objects

B. recording and reproducing three dimensional images

C. tracing out planets and stars in the sky

D. transmitting light waves

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The phenomenon of radioactivity was discovered by

A. Rutherford

B. Bohr

C. Henri Bacquerel

D. Marie Curie

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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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Astigmatism, a structural defect of the eye, is due to

A. the eye lens being thin

B. the eye lens being thick

C. lack of symmetry in the curvature of the eye preventing rays of light from being brought to a common focus

D. the pupil being very small

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Acoustics' la a branch or study dealing with

A. historical sites

B. architecture

C. sound

D. trigonometry

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The asteroids belt lies between the orbits of

A. Earth and Mars

B. Venus and Earth

C. Mars and Jupiter

D. Moon and Mars

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The shadow below a tree has bright spots in it because

A. light comes through circular gaps between the leaves

B. the leaves are circular

C. the rays bend to form circular spots

D. the gaps between the leaves act as pin holes

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The presence of impurities

A. lowers the melting point of ice

B. raises the melting point of ice

C. has no effect on the melting point of ice

D. may lower or raise the melting point depending upon the type of impurities

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Mica is used in an electric iron because it is a

A. good conductor of heat

B. good conductor of electricity

C. bad conductor of electricity

D. Both (a) and (b) above

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The maximum displacement of the particle in a mechanical wave motion is known as

A. amplitude

B. vibration

C. frequency

D. phase

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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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Diamond shines because of its

A. purity

B. hardness

C. high density

D. high refractive index and low critical angle

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Formation of shadows can be explained by

A. rectilinear propagation of light

B. reflection

C. refraction

D. total internal reflection

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The velocity of sound in a medium is

A. directly proportional to its pressure

B. inversely proportional to the square root of its pressure

C. directly proportional to the square root of its pressure

D. independent of its pressure

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In a hydraulic pressure

A. force on each square centimetre of the small piston is less than the force on each square centimetre of the large piston

B. the distance the small piston moves is equal to the distance the large piston moves

C. applied pressure is equally transmitted throughout the liquid in all directions

D. force acting on small piston is equal to the force acting on large piston

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The strength of an electromagnet can be increased by

A. increasing the length of the coiled wire

B. increasing current supply

C. increasing the size of the iron core

D. All the above

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If the speed of the rotation of the earth increases the weight of a body

A. will increase

B. will decrease

C. will have no change

D. will either increase or decrease

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

A. the centripetal force

B. the centrifugal force

C. the frictional force

D. All the above

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A thermostat is a device used

A. for automatically maintaining a steady temperature

B. for measuring electricity

C. to reduce the voltage of electricity

D. for producing heat

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Fish and other aquatic creatures can live inside a deep frozen pond because

A. fish are cold-blooded animals

B. ice is a bad conductor of heat

C. there will always be water just beneath the ice level

D. they can adapt themselves to live in ice

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Lightning is produced when

A. similar charges of electricity rush towards each other and then get repelled

B. clouds strike against impurities in air and the friction burns up these impurities

C. strong opposite charges in different clouds break down the resistance offered by the intervening air

D. water vapour produces electricity in the clouds

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The barometer was invented by

A. Michael Faraday

B. Torricelli

C. Thomas Alva Edison

D. Benjamin Franklin

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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

Less dew is formed on cloudy nights because

A. there is no moisture in the atmosphere

B. clouds absorb the falling dew

C. objects emit radiant energy very fast on such nights

D. objects lose less radiant energy

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A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

A. decreasing the radius of the capillary tube

B. increasing the radius of the capillary tube

C. increasing the height of water in the vessel

D. None of these

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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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A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will

A. increase

B. decrease

C. remain the same

D. first decrease and then increase

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A piece of cork is embedded inside an ice block which floats in water. What will happen to the level of water when all ice melts?

A. It will go down

B. It will come up

C. It will remain at the same level

D. First it will go down and it will come up

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In a river, the currents are fastest where the river la

A. wide and shallow

B. narrow and shallow

C. wide and deep

D. narrow and deep

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The property of a fluid by which it resists relative motion within itself is known as

A. cohesive force

B. surface tension

C. diffusion

D. viscosity