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Current Affairs January 2024

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Who discovered superconductivity in 1911?

A. Kamerlingh Onnes

B. Alex Muller

C. GeoryBednorz

D. Charles Coulomb

Correct Answer :

A. Kamerlingh Onnes


Related Questions

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Materials that have very high permeabilities (hundreds and even thousands times of that of free space)

A. Paramagnetic

B. Non- magnetic

C. Ferromagnetic

D. Diamagnetic

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A law that states that the polarity of the induced voltage will oppose the change in magnetic flux causing the induction.

A. Joule's law

B. Faraday's law

C. Coulomb's law

D. Lenz' law

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The dielectric constant of most materials lies between

A. 1 and 10

B. 10 and 20

C. 20 and 50

D. 50 and 100

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__________ is a substance of whose molecules consist of the same kind of atom.

A. Mixture

B. Compound

C. Element

D. Isotope

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If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then the end under observation is a south pole. This is known as

A. Right hand rule

B. Left hand rule

C. Cork screw rule

D. End Rule

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Whenever a conductor cuts magnetic fluxa an emf is induced in it. This is known as

A. Coulomb's law

B. Joule's law

C. Faraday's law

D. Ohm's law

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The emission of electrons from hot bodies is called

A. Radiation effect

B. Edison effect

C. Skin effect

D. Half effect

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One ampere- turn is equivalent to _____ gilberts

A.

B.

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Which of the following is a vector quantity?

A. Magnetic potential

B. Magnetic field intensity

C. Magnetic permeability

D. F lux density

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What revolves about the positive nucleus in a definite orbit?

A. Atom

B. Proton

C. Electron

D. Neutron

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Which of the following is a paramagnetic material?

A. Carbon

B. Copper

C. Bismuth

D. Oxygen

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What determines the value of the temperature coefficient of resistance of a material?

A. length

B. cross-sectional area

C. volume

D. nature and temperature

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Referred to as the specific reluctance of a material

A. Resistivity

B. Reluctivity

C. Conductivity

D. Permeability

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Who demonstrated that there are magnetic effects around every current-carrying conductor and that current-carrying conductors can attract and repel each other just like magnets?

A. Luigi Galvani

B. Hans Christian Oersted

C. Charles Coulomb

D. Andre Ampere

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Electronic current in a wire is the flow of ____________ electrons.

A. free

B. valence

C. bound

D. loose

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A positively charged body has

A. deficit of electrons

B. excess of neutrons

C. excess of electrons

D. deficit of protons

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A t/m is a unit of

A. Mmf

B. Emf

C. Reluctance

D. Magnetizing force

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A law stating that the magnetic susceptibilities of most paramagnetic substances are inversely proportional to their absolute temperatures.

A. Curie's Law

B. Child's Law

C. CR Law

D. Curie-Weiss Law

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What is the SI unit of conductivity?

A. Ohms/m

B. Ohms-m

C. Siemens-m

D. Siemens/m

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The resistance of a material is ____________ its area of cross-section.

A. directly proportional

B. independent of

C. inversely proportional to

D. equal to

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What is the SI unit of reluctance?

A. At

B. At/m

C. N/Wb

D. At/Wb

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The force acting on a unit n- pole placed at that point is called

A. Magnetic field intensity

B. Electric field intensity

C. Electromagnetic field intensity

D. Intensity magnetization

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Whenever a flux inking a coil or current changesa an emf is induced in it. This is known as

A. Joule's Law

B. Coulomb's Law

C. Faraday's first law of electromagnetic induction

D. Faraday's second law of electromagnetic induction

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Flux density is measured in

A. Tesia

B. Weber

C. Ampere- turn

D. Maxwell

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Hipernik is an alloy containing __________ iron and __________ nickel.

A. 40% ; 60%

B. 60% ; 40%

C. 50% ; 50%

D. 70% ; 30%

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The tiniest element of matter

A. Atom

B. Proton

C. Electron

D. Neutron

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______ is an electromagnet with its core in the form of a close magnetic ring.

A. S olenoid

B. Paraboloid

C. Toroid

D. Cycloid

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In electro-mechanical conversion devices like generators and motors the reason why a small air gap is left between the rotor and stator is to

A. permit mechanical clearance

B. increase flux density in air gap

C. decrease the reluctance of magnetic path

D. complete the magnetic path

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Who developed the electromagnetic theory of light in 1862?

A. Heinrich Rudolf Hertz

B. Wilhelm Rontgen

C. James Clerk Maxwell

D. Andre Ampere

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Electric field intensity is a ________.

A. scalar

B. phasor

C. vector

D. variable