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Current Affairs January 2024

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4

The net electrical charge in an isolated system remains constant. This is known as

A. Law of conservation of charge

B. Coulomb's first law

C. Coulomb's second law

D. Law of conservation of energy

Correct Answer :

A. Law of conservation of charge


Related Questions

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What is the practical unit of electrical energy?

A. Watt

B. Kilowatt-hour

C. Kilowatt-second

D. Megawathour

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4

If the resistance of a material 2 m long and 2 m^2 in area of cross-section is 1.6 ×10^-8 ?a then its resistivity is

A. 3.2 × 10^-8 ?-m

B. 1.6 × 10^-8 ?-m

C. 0.64 × 10^-8 ?-m

D. 0.16 × 10^-8 ?-m

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4

A magnetic field is

A. The current flow through space around a permanent magnet

B. The force set up when current flows through a conductor

C. The force that drives current through a resistor

D. The force between the plates of a charged capacitor

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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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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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4

If the value of 25 a conductor is 1/255 per oCa then the value of 20is

A. 1/300 per oC

B. 1/250 peroC

C. 1/230 per oC

D. 1/260 per oC

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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

The electric potential across part AB of a circuit is 5 V; point A being at higher potential. If a charge of 5 Cmoves from A to Ba then energy released as

A. 5 joules

B. 25 joules

C. 10 joules

D. 100 joules

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4

The magnetic field of a bar magnet most closely resembles the magnetic field of

A. a horseshoe magnet

B. a straight current- carrying wire

C. a stream of electrons moving parallel to one another

D. a current- carrying wire loop

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4

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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4

This paper does not exhibit electricity because it contains the same number of

A. protons and electrons

B. neutrons and electrons

C. neutrons and positrons

D. atoms

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4

Hydrogen is an example of a _____ material.

A. Paramagnetic

B. Diamagnetic

C. Ferromagnetic

D. N on- magnetic

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4

The K shell or the first shell has how many permissible number of orbiting electrons?

A.

B.

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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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4

The reluctance of the magnetic circuit is ________ relative permeability of the material comprising the circuit.

A. directly proportional to

B. inversely proportional to

C. independent of

D. dependent of

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4

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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4

Germanium atom has ______ protons and ______ electrons.

A. 32, 32

B. 32, 42

C. 42, 32

D. 34, 34

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The mass of proton is __________ the mass of an electron.

A. equal to

B. about 1837 times

C. less than

D. 200 tim es

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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

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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Defined as the number of lines per unit area through any substance in a plane at right angles to the lines of force

A. Flux

B. Flux lines

C. Flux density

D. Flux intensity

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The uncharged particles which have no effect on its atomic charge.

A. Nucleons

B. Electrons

C. Protons

D. Neutrons

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What bond is formed when electrons in the outermost energy orbits of the atoms are shared between two or more electrons?

A. Ionic

B. Covalent

C. Metallic

D. Van der Waals

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4

If the distance between two magnetic poles decreases by 2 timesa the force between them

A. decreases two times

B. increases four times

C. increases two times

D. decreases four times

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4

A law that states that the current in a thermionic diode varies directly with the three- halves power of anode voltage and inversely with the square of the distance between the electrodesa provided operating conditions are such that the current is limited only by the space charge.

A. Hall's law

B. Joule's law

C. Child's law

D. Coulomb's law

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4

Magnetic intensity is a

A. Phasor quantity

B. Physical quantity

C. Scalar quantity

D. Vector quantity

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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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The air space between poles of magnets

A. Air gap

B. Free space

C. Vacuum

D. Atmosphere

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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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4

The reluctance of a magnetic circuit is not dependent on which of the following?

A. Number of turns of coil

B. Magnetomotive force

C. Flux density in the circuit

D. Current in the coil