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Current Affairs January 2024

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4

A test charge means a charge of

A. -1 C

B. 1 electron

C. +1 C

D. -20 C

Correct Answer :

C. +1 C


Related Questions

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4

The relative permeability of a magnetic material is 10^5. What is its permeability?

A. 4 × 10^5 H/m

B. 4 × 10^-12 H/m

C. 4× 10^-2 H/m

D. 4 × 10^7H/m

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4

What is the other name for dielectric strength?

A. Breakdown voltage

B. Electric intensity

C. Potential gradient

D. Dielectric constant

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4

What is the SI unit of conductance?

A. Siemens

B. Mhos

C. Ohms

D. 1/Ohms

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4

Under ordinary conditionsa a body is considered

A. positively charged

B. neutral

C. negatively charged

D. stable

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4

Another term for corona discharge.

A. Lightning

B. Sparking

C. Aurora

D. Corona Effect

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4

Amorphous solid is also called

A. Crystalline

B. Non- crystalline

C. Polycrystalline

D. Homogenous

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4

The property of magnetic materials of retaining magnetism after withdrawal of the magnetizing force is known as

A. Retentivity

B. Reluctivity

C. Resistivity

D. Conductivity

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4

Paramagnetic substance has a relative permeability of

A. Slightly less than one

B. Equal to one

C. Slightly equal to one

D. Very much greater than one

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4

Which of the following materials has the least hysteresis loop area?

A. soft iron

B. silicon steel

C. hard steel

D. wrought iron

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4

Hysteresis loss can be reduced by one of the following.

A. Increasing mmf of the circuit

B. Using material narrow hysteresis loop

C. Using ferromagnetic core

D. Laminating the magnetic circuit

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4

All matters (gasa liquid and solid) are composed of

A. Neutrons

B. Particles

C. Electrons

D. Atoms

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4

Permeance of a magnetic circuit is _________ the cross-sectional area of the circuit.

A. directly proportional to

B. inversely proportional to

C. dependent of

D. independent of

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4

Electric field intensity is a ________.

A. scalar

B. phasor

C. vector

D. variable

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4

Which of the following materials has the highest dielectric strength?

A. Glass

B. Oiled paper

C. Mica

D. Air

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4

Why is it that the magnitude of magnetomotive force required for air gap is much greater than that required for iron part of a magnetic circuit?

A. Because air is a gas

B. Because air has the highest relative permeability

C. Because air is a conductor of magnetic flux

D. Because air has the lowest relative permeability

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4

The core of a magnetic equipment uses a magnetic material with

A. Least permeability

B. Low permeability

C. Moderate permeability

D. High permeability

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4

How many electrons are needed in the valence orbit to give a material's stability?

A.

B.

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4

If two similar charges 1 coulomb each are placed 1 m apart in aira then the force of repulsion is

A. 8 × 10^6 N

B. 9 × 10 ^9 N

C. 10^6 N

D. 5 × 10^6 N

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4

How much is the flux in Weber in the above problem?

A. 2 x 10^-5

B. 2 x 10^-3

C. 2 x 10^5

D. 2 x 10^3

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4

A factor used to correct for the electrostatic forces of the more distant ions in an ionic solid.

A. Avogadro's number

B. Planck's constant

C. Boltzmann's constant

D. Madelung constant

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4

Which of the following electric quantities is vector in character?

A. Field

B. Charge

C. Energy

D. Potential Difference

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4

The electric potential at a point in air due to a charge is 21 V. If the air is replaced by a medium of relative permittivity of 3a then electric potential at that point will be

A. 63 V

B. 21 V

C. 7 V

D. 42 V

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4

The simplest type of atom to exist is the ______ atom.

A. Helium

B. Hydrogen

C. Boron

D. Oxygen

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4

A law establishing the fact that the algebraic su of the rises and drops of the mmf around a closed loop of a magnetic circuit is equal to zero.

A. Kirchhoff's circuital law

B. Maxwell's circuital law

C. Ampere's circuital law

D. Coulomb's circuital law

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4

The flux density in an air-cored coil is 10^-3 Wb/m^2. With a cast iron core of relative permeability 100 inserteda the flux density will become

A. 10^-3 Wb/m^2

B. 10^-2 Wb/m^2

C. 10^3 Wb/m^2

D. 0.1 Wb/m^2

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4

What is the unit of magnetomotive force?

A. Volt

B. Tesla

C. Ampere- turn

D. Weber

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4

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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4

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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4

A permanent magnet does not exert a force on

A. an unmagnetized iron bar

B. a magnetized iron bar

C. a moving electric charge

D. a stationary electric charge

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4

The B-H curve of ________ is not a straight line.

A. air

B. wood

C. silicon steel

D. soft iron