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Ohm's law cannot be applied to which material?

A. Copper

B. Silver

C. Silicon carbide

D. Aluminum

Correct Answer :

C. Silicon carbide


Related Questions

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What is the SI unit of magnetic flux?

A. Tesla

B. Weber

C. Maxwell

D. Gauss

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An alloy of 22 percent iron and 78 per cent nickel.

A. Permalloy

B. Alnico

C. Constantan

D. M anganin

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The diameter of a hydrogen atom is approximately ______ cm.

A. 1.1 x 10^-6

B. 1.1 x 10^7

C. 1.1 x 10^-8

D. 1.1 x 10^-9

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The resistivity of a conductor ___________ with an increase in temperature.

A. increases

B. decreases

C. remains the same

D. becomes zero

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One weber of flux is equal to _______ magnetic lines of force.

A. 10^6

B. 10^10

C. 4 × 10^7

D. 10^8

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Electric field intensity is a ________.

A. scalar

B. phasor

C. vector

D. variable

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A principle that states that only two electrons with different spins are allowed to exist in a given orbit

A. Bohr's principle

B. Pauli exclusion principle

C. Avogadro's principle

D. Coulomb's principle

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Used to maintain strength of magnetic field

A. Container

B. Air gap

C. Keeper

D. S ource

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What is the usual value of leakage coefficient for electrical machines?

A. 0.5 to 1

B. 1 to 5

C. 5 to 10

D. 1.15 to 1.25

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The evaporation of electrons from a heated surface is called

A. Radiation

B. Convection

C. Thermionic emission

D. Conduction

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The idea of preventing one component from affecting another through their common electric and magnetic field is referred to as

A. Hall effect

B. Grounding

C. Shielding

D. Limiting

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The unit of flux density is

A. Wb/m

B. Tesla

C. At/m

D. N/Wb

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The point in a magnet where the intensity of magnetic lines of force is maximum

A. Magnetic pole

B. South pole

C. North pole

D. Unit pole

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The potential at a point due to a charge is 15 V. If the distance is times, the potential at the point will be

A. 5 V

B. 18 V

C. 45 V

D. 15 V

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The energy stored in an electrostatic field or electromagnetic field is called

A. Electromagnetic energy

B. Kinetic energy

C. Potential energy

D. R est energy

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Which of the following has the least number of valence electrons?

A. Conductor

B. Semiconductor

C. Insulator

D. Semi- insulator

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An atom or a group of atoms that carries a net electric charge.

A. Positive ion

B. Negative ion

C. Ion

D. Electron

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The ability of a material to conduct magnetic flux through it.

A. Permittivity

B. Reluctivity

C. Conductivity

D. Permeability

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If the number of valence electrons of an atom is less than 4a the substance is called

A. a conductor

B. a semiconductor

C. an insulator

D. a superconductor

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Which of the following is used by temporary magnets as the magnetic material?

A. Hardened steel

B. Cobalt steel

C. Soft iron

D. Tungsten steel

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The magnetic flux of 2000 lines is how many Maxwells?

A.

B.

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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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An effect which is generally used in the gausameter to measure flux density.

A. Skin effect

B. Magnetic effect

C. Hall effect

D. Flywheel effect

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Amorphous solid is also called

A. Crystalline

B. Non- crystalline

C. Polycrystalline

D. Homogenous

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Bonding of atoms that is due to the force of attraction between positive ions and a group of negative ions

A. Ionic bond

B. Covalent Bond

C. Electrostatic Bond

D. Metallic bond

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If the number of valence electrons of an atom is less than 4a then the substance is probably

A. a metal

B. an insulator

C. a non-metal

D. a semiconductor

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If a magnetic flux cuts across 200 turns at a rate of 2Wb/sa the induced voltage according to Faraday's law is about

A. 400 V

B. 100 V

C. 200 V

D. 600 V

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When the ferromagnetic substance is inserted in a current- carrying solenoida the magnetic field is

A. Greatly decreased

B. Greatly increased

C. Slightly decreased

D. Slightly increased

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One of the solid structures in which the position of the atoms or ions are predetermined

A. Crystalline solid

B. Amorphous solid

C. Polycrystalline solid

D. Poly amorphous solid

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If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in the direction of current flow, the motion of its handle will indicate the direction of magnetic flux produced around the conductor. This is known as

A. Right hand rule

B. Left hand rule

C. Cork screw rule

D. End rule