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Current Affairs January 2024

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4

The device that is used to measure the electromotive force of a cell is

A. an ammeter

B. a rheostat

C. a voltmeter

D. a voltameter

Correct Answer :

C. a voltmeter


Related Questions

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A bucket of water is hung from a spring balance. A piece of iron is suspended in the water without touching the sides or touching the bottom of the bucket. The reading of the spring balance

A. will increase

B. will decrease

C. does not change

D. varies with the increase of depth of the immersion of the iron piece

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4

The neutron, one of the constituent particles of which the nuclei of atoms are composed was discovered by

A. Irene Curie

B. W Bothe and H Becker

C. James Chadwick

D. Jean Joliot

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The electroplating of a metallic article

A. protects the article from atmospheric corrosion

B. gives it a more attractive appearance

C. Both (a) and (b) above

D. None of the above

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4

Velocity of sound in high altitudes is low because at such a height

A. the temperature is low

B. there is no air

C. the pressure is low

D. All the above

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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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The earth's nearest neighbour in space is

A. the Sun

B. the Moon

C. the Venus

D. the Mars

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The radius of an atom is approximately

A. 10-10 cm

B. 10-12 cm

C. 10-13 cm

D. 10-16 cm

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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

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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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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

The unit of heat energy is

A. watt

B. degree

C. joule

D. erg

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When one enters a dark room after being in bright light one is not able to see anything clearly for a while because

A. the retina of the eye moves forward

B. the retina of the eye moves backward

C. c).the iris is unable to dilate the pupil immediately to be able to see things

D. the eye has no power of accommodation

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4

Separating particles from a suspension is effected by

A. centrifugal force

B. frictional force

C. gravitational force

D. distillation

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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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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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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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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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Which of the following revolves round the nucleus in an atom?

A. protons

B. electrons

C. neutrons

D. positrons

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If a bar magnet is broken into two pieces

A. both pieces will lose their magnetism

B. one piece will have North Pole on both ends and the other South Pole on its both ends

C. each will remain a magnet with North Pole at one end and South Pole at the other

D. the longer piece will behave as a bar magnet while the smaller will have no magnetism at all

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Which of the following is wrongly matched?

A. electric current - ampere

B. resistance - Ohm

C. electric power - volt

D. electric charge Coulomb

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Which physical quantity is measured in watts

A. power

B. kinetic energy

C. momentum

D. impulse

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4

The phenomenon of radioactivity was discovered by

A. Rutherford

B. Bohr

C. Henri Bacquerel

D. Marie Curie

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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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Which of the following rays has the highest penetrative power?

A. a -rays

B. � -rays

C. ? -rays

D. X-rays

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4

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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4

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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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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The coil of an electric heater is made of

A. Platinum

B. Tungsten

C. Nichrome

D. Copper

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Galaxies emit

A. radio waves and X-rays

B. ultraviolet light waves

C. visible light waves

D. All the above

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The sun continuously produces an enormous amount of energy. This is due to

A. nuclear fission

B. nuclear fusion

C. chemical combustion

D. boiling