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Current Affairs January 2024

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Germanium atom has ______ protons and ______ electrons.

A. 32, 32

B. 32, 42

C. 42, 32

D. 34, 34

Correct Answer :

A. 32, 32


Related Questions

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A test charge means a charge of

A. -1 C

B. 1 electron

C. +1 C

D. -20 C

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Electric field intensity at a point is numerically equal to ________ at that point.

A. potential gradient

B. potential difference

C. dielectric constant

D. the force

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A theorem which states that an electric current flowing in a circuit produces a magnetic field at external points equivalent to that due to a magnetic shell whose bounding edge is the conductor and whose strength of the current.

A. Joule's law

B. Faraday's law

C. Volta's theorem

D. Ampere's theorem

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4

A one cubic cm of copper has how many free electrons at room temperature?

A. 80 × 10^18

B. 8.5 × 10^22

C. 20 × 10^10

D. 50 × 10^20

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The amount of magnetizing force to counter balance the resid magnetic material is referred to as

A. Reluctivity

B. Susceptivity

C. Coercivity

D. Retentivity

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Back emf refers to the

A. Current equal to the applied emf

B. Opposing emf

C. Current opposing the applied emf

D. Voltage opposing the applied emf

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Electric potential is a _______ quantity.

A. scalar

B. phasor

C. vector

D. variable

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Formed when there exist distant electronic interactions between (opposite) charges present in the neighboring atoms or molecules.

A. Ionic bond

B. Covalent bond

C. Metallic bond

D. Van der Waals bond

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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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The force between two magnetic poles is _______ their pole strengths.

A. directly proportional to

B. the sum of

C. inversely proportional to

D. the product of

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Theory of ferromagnetic phenomena which assumes each atom is a permanent magnet which can turn freely about its center under the influence of applied field and other magnets.

A. Ewing's theory of ferromagnetism

B. Oersted's ferromagnetism theory

C. Maxwell's magnetic theory

D. Ampere's circuital law

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Defined as the ratio of the volume occupied by the atoms or ions in a unit cell divided by the volume of the unit cell and is used to measure the compactness of a crystal.

A. Atomic packing factor (APF)

B. Ionic Packing Ratio (IPR)

C. Atomic compacting factor (ACF)

D. Ionic compacting ratio (ICR)

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A magnetizing force of 1000 AT/m will produce a flux density of __________ i

A. 1.257 mWb/m^2

B. 0.63 Wb/m^2

C. 1.257 Wb/m^2

D. 0.63 mWb/m^2

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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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The quantity of magnetism retained by a magnetic material after withdrawal of the magnetizing force is called

A. Leftover magnetism

B. Hysteresis

C. Residual magnetism

D. Coercivity

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The magnetic flux of 2000 lines is how many Maxwells?

A.

B.

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If the length and area of cross-section of a wire are doubleda then its resistance

A. becomes four times

B. becomes sixteen times

C. remains the same

D. becomes two times

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The core of a transformer heats up when its primary is fed from an ac source because of

A. permeability

B. ferromagnetism

C. reluctance of core

D. hysteresis loss

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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

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4

Magnetic field intensity is a ________ quantity.

A. scalar

B. phasor

C. vector

D. variable

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The unit of electrical energy is

A. Joule

B. Watt- second

C. Kilowatt hour

D. All of these

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The temperature coefficient of resistance of conductors is

A. positive

B. zero

C. negative

D. infinite

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What is the reluctance of a magnetic path having a length of 2x 10^-3m and crosssectional area of 2.5 x 10^-3 m^2?

A. 6366 A, t/Wb

B. 6000 A, t/Wb

C. 8x10^-3 A, t/Wb

D. 0.8 A, t/Wb

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Which of the following has the highest permeability?

A. Soft iron

B. Steel

C. Air

D. Permalloy

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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

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What is the measure of the density and sign of the electric charge at a point relative to that at some time?

A. Electric potential

B. Electric charge

C. Electric current

D. Electric intensity

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If the value of 25 of a conductor is 1/230 per oCa then the value of 0is

A. 1/180 peroC

B. 1/150 per oC

C. 1/280 per oC

D. 1/230 per oC

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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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A 200-watt lamp working for 24 hours will consume approximately _____ units.

A.

B.

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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