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Current Affairs January 2024

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4

The force of attraction or repulsion between two magnetic poles is directly proportional to their strengths.

A. Newton's first law

B. Faraday's first law of electromagnetic induction

C. Coulomb's first law

D. Coulomb's second law

Correct Answer :

C. Coulomb's first law


Related Questions

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4

What solid has no defined crystal structure except perhaps in the arrangement of the nearest neighboring atoms or ions?

A. Crystalline

B. Amorphous

C. Polycrystalline

D. Poly amorphous

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4

Permeability means

A. The conductivity of the material for magnetic lines of force

B. The magnetization test in the material after exciting field has been removed

C. The strength of an electromagnet

D. The strength of the permanent magnet

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4

The unit of electrical energy is

A. Joule

B. Watt- second

C. Kilowatt hour

D. All of these

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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

Electromotive force in a circuit

A. causes free electrons to flow

B. increases the circuit resistance

C. maintains circuit resistance

D. is needed to make the circuit complete

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4

What is the practical unit of electrical energy?

A. Watt

B. Kilowatt-hour

C. Kilowatt-second

D. Megawathour

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4

Magnetic fields do not interact with

A. Moving permanent magnets

B. Stationary permanent magnets

C. Moving electric charges

D. Stationary electric charges

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4

__________ 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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4

Which of the following statements is TRUE?

A. Silicon dioxide is a good

B. The current carriers in conductors are valence electrons

C. For conductorsa the valence electron are strongly attracted to the nucleus

D. The valence electrons are located in the nucleus of an atom

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4

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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4

A current if flowing east along a power line. If the earth's field is neglecteda the direction of the magnetic field below it is

A. North

B. South

C. East

D. West

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4

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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4

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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4

What is the SI unit of conductivity?

A. Ohms/m

B. Ohms-m

C. Siemens-m

D. Siemens/m

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4

A germanium atom has an atomic weight of72. How many neutrons are there?

A.

B.

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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

What is the relative permittivity of air?

A.

B.

C. 8.854 × 10^-12

D. 4 × 10^7

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4

What is another name for relative permittivity?

A. Dielectric strength

B. Electric intensity

C. Potential gradient

D. Dielectric constant

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4

The current of electric circuit is analogous to which quantity of a m

A. Mmf

B. Flux

C. Flux density

D. R eluctivity

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4

The phenomenon that when an electric current passes through an anisotropic crystala there is an absorption or liberation of heat due to the non-uniformity in current distribution.

A. Bridgman effect

B. Corona effect

C. Dember effect

D. Destriau effect

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4

What type of bond is formed when there exists some form of collective interactions between the (negatively charged) electrons and (positively charged) nuclei in a solid?

A. Ionic

B. Covalent

C. Metallic

D. Van der Waals

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4

If the magnetic material is located within a coil through which alternating current (60 Hz frequency) flowsa then __________ hysteresis loops will be formed

A.

B.

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4

Electron is a Greek word for

A. amber

B. Fire

C. Stone

D. Heat

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4

What is used as the insulating material or dielectric in an electric ion

A. Oiled paper

B. Mica

C. Paraffin

D. Tit anate compound

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4

Permeance is analogous to

A. Conductance

B. Reluctance

C. Admittance

D. Resistance

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4

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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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

The phenomenon by which a magnetic substance becomes a magnet when it is place near a magnet

A. Magnetic effect

B. Magnetic phenomenon

C. Magnetic induction

D. Electromagnetic induction

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4

Three charges of +5 Ca -6 C and +9 C are placed inside a sphere. What is the total flux passing through the surface of sphere?

A. 8 C

B. 14 C

C. 20 C

D. -6 C

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4

Defined as the flux density produced in it due to its own induced magnetism

A. Magnetic field intensity

B. Electric field intensity

C. Electromagnetic field intensity

D. Intensity magnetization