Home
Current Affairs January 2024

What is the correct answer?

4

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

Correct Answer :

A. a metal


Related Questions

What is the correct answer?

4

What is the SI unit of specific resistance or resistivity?

A. Ohm-circular mil per inch

B. Ohm-circular mil per foot

C. Ohm-m

D. Ohm-cm

What is the correct answer?

4

The magnetic field around the conductor is determined by the

A. Size of the conductor

B. Amount of current

C. Current divided by the resistance

D. Resistance divided by the current

What is the correct answer?

4

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

What is the correct answer?

4

If the relative permittivity of a material is 10a then its permittivity is

A. 4 × 10^7F/m

B. 4 × 10^-6 F/m

C. 8.854× 10^-11 F/m

D. 8.854 × 10^-12 F/m

What is the correct answer?

4

One farad equals

A. 1 coulomb/volt

B. 1 newton/coulomb

C. 1 newton-meter

D. 1 volt/second/ampere

What is the correct answer?

4

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

A. Permalloy

B. Alnico

C. Constantan

D. M anganin

What is the correct answer?

4

The physical motion resulting from the forces of magnetic fields is called

A. Motor action

B. Rotation

C. Repulsion

D. Torque action

What is the correct answer?

4

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

A. a semiconductor

B. a conductor

C. an insulator

D. a semi-insulator

What is the correct answer?

4

The emission of electrons from hot bodies is called

A. Radiation effect

B. Edison effect

C. Skin effect

D. Half effect

What is the correct answer?

4

The relation between absolute permittivity of air ( 0)a absolute p and velocity of light (c) is given by

A. 0 0= c^2

B. 0 0= c

C. 1/ 0 0= c

D. 1/ 0 0= c^2

What is the correct answer?

4

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

What is the correct answer?

4

The temperature coefficient of resistance of insulators is

A. zero

B. negative

C. positive

D. infinite

What is the correct answer?

4

The quantity 10^6 maxwells is equivalent to one

A. Weber

B. Gauss

C. Gilbert

D. Tesla

What is the correct answer?

4

What is the relative permittivity of air?

A.

B.

C. 8.854 × 10^-12

D. 4 × 10^7

What is the correct answer?

4

Cobalt is an example of a ______ material.

A. Paramagnetic

B. Diamagnetic

C. Ferromagnetic

D. Non- magnetic

What is the correct answer?

4

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

What is the correct answer?

4

What is the cgs unit of magnetomotive force?

A. Gilbert

B. Ampere- turn

C. Maxwell

D. Weber

What is the correct answer?

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

What is the correct answer?

4

Magnetic intensity is a

A. Phasor quantity

B. Physical quantity

C. Scalar quantity

D. Vector quantity

What is the correct answer?

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

What is the correct answer?

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

What is the correct answer?

4

The force acting on a pole of 5 Wb is 25 N. What is the intensity of the magnetic field?

A. 5 N/Wb

B. 25 N/Wb

C. 125 N/Wb

D. 0.2 N/Wb

What is the correct answer?

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

What is the correct answer?

4

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

What is the correct answer?

4

One of the common application of an air- cored choke.

A. Radio frequency

B. Audio frequency

C. Power supply

D. Power transformer

What is the correct answer?

4

Two similar polesa each 1Wba placed 1 m apart in air will experience a repulsive force of

A. 63000 N

B. 63 × 10^-3 N

C. 8 × 10^12 N

D. 796 kN

What is the correct answer?

4

Small voltages generated by a conductor with current in an external magnetic field.

A. Skin effect

B. Magnetic effect

C. Hall effect

D. Flywheel Effect

What is the correct answer?

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

What is the correct answer?

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

What is the correct answer?

4

The phenomenon by which a subtracts pieces of iron

A. Magnetism

B. Electromagnetism

C. Naturalism

D. Materialism