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Current Affairs January 2024

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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

Correct Answer :

B. atomic number


Related Questions

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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 refrigerator cooling is produced by

A. the ice that deposits on the freezer

B. the evaporation of a volatile liquid

C. None of the above

D. Both (a) and (b)

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4

A timer in a race is at the finish line. He should start his stop watch

A. as soon as he hears the report of the gun

B. the moment he sees the flash

C. either (a) or (b) since that makes no difference

D. None of the above

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4

Which of the following is known as freon?

A. Liquid ammonia

B. Carbon tetrafluoride

C. Dichloro-difluoro-methane

D. Sulphur dioxide

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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

When we sweat, we feel comfortable under a fan because

A. the air circulated by the fan is cool

B. the fan produces convection currents of air

C. the air circulated by the fan quickens the evaporation of the moisture on our skin

D. the air takes away the heat from our body

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4

The spectrum of white light can be studied by

A. a microscope

B. a telescope

C. a stereoscope

D. a spectroscope

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4

Acoustics' la a branch or study dealing with

A. historical sites

B. architecture

C. sound

D. trigonometry

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4

A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle

A. at the lower elevation than the bird

B. at a higher elevation than the bird

C. in the same direction as the bird

D. vertically upwards

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4

A body has fallen from a height. Just before touching the pound it has

A. lost all its potential energy and gained an equivalent amount of kinetic energy

B. gained potential energy and lost kinetic energy

C. gained kinetic energy as well as potential energy

D. lost kinetic energy as well as potential energy

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4

If a body weight 12N on the surface of the earth, how much will it weigh on the surface of the moon where acceleration due to gravity is only one-sixth of that on earth's surface?

A. 12N

B. 2N

C. 10N

D. 6N

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4

The unit of power in SI is

A. Joule

B. Newton

C. Joule/Sec

D. Erg/Sec

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4

The source of electric energy in an artificial satellite is

A. mininuclear reactor

B. a dynamo

C. a thermopile

D. solar cells

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4

When an electric bulb breaks, there is an explosive sound. That is due to

A. the chemical reaction between the gases inside the bulb

B. the compressed gases inside rushing out suddenly

C. the air outside rushing in to fill the vacuum inside the bulb

D. None of the above

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4

The ballistic missile, Agni 11, tested by India has a maximum range of

A. 1000 km

B. 1500 km

C. 2000 km

D. 500 km

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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

Stars twinkle because of

A. refraction of light from them through air

B. reflection

C. absorption

D. All the above

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4

The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because

A. the ringing is not loud enough

B. the glass of the bell jar absorbs the sound waves

C. the bell jar is too small

D. there is no air or -any other gas in the bell jar

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4

The characteristics of a musical note are

A. loudness

B. pitch

C. quality or timbre

D. All the above

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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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4

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

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4

Which physical quantity is measured in watts

A. power

B. kinetic energy

C. momentum

D. impulse

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4

The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by

A. Bernoulli's principle

B. Magnetic properties of the ship's material

C. Newton's third law of motion

D. Earth's gravitational force

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4

Isotones are species of atoms containing

A. same number of protons but different number of neutrons

B. same number of neutrons but different number of protons

C. the same total number of protons and neutrons

D. same number of protons and different number of electrons

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4

A temperature below absolute zero for an ideal gas

A. cannot be attained experimentally

B. can be attained

C. is impossible

D. Does not exist at all

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4

The difference between planets and stars is

A. planets do not have light of their own whereas stars shine by their own light

B. planets do not twinkle like stars

C. planets are much smaller than stars

D. All the above

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4

When a body is projected upwards

A. the time for the upward journey and downward journey are the same

B. the upward journey takes more time

C. the downward journey takes more time

D. Can't be said

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4

The image of an object formed on the retina of the eye is

A. virtual and upright

B. virtual and inverted

C. real and inverted

D. real and upright

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4

Halley's comet appears in the heavens once in

A. 40 years

B. 50 years

C. 76 years

D. 80 years

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Alpha particles are

A. electromagnetic radiations

B. helium nuclei

C. negatively charged particles

D. neutral particles