Home
Current Affairs January 2024

What is the correct answer?

4

What is the SI unit of conductivity?

A. Ohms/m

B. Ohms-m

C. Siemens-m

D. Siemens/m

Correct Answer :

D. Siemens/m


Related Questions

What is the correct answer?

4

A magnetic material losses its ferromagnetic properties at a point called

A. Curie temperature

B. Inferred absolute temperature

C. Room temperature

D. Absolute temperature

What is the correct answer?

4

A substance that attracts pieces iron

A. Conductor

B. Semiconductor

C. Magnet

D. All of the above

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

The space outside the magnet where its pole have a force of attraction or repulsion on a magnetic pole is called

A. Magnetic field

B. Electric field

C. Electromagnetic field

D. Free Space Field

What is the correct answer?

4

The greater percentage of materials is _________.

A. diamagnetic

B. paramagnetic

C. ferromagnetic

D. non-magnetic

What is the correct answer?

4

______ is an electromagnet with its core in the form of a close magnetic ring.

A. S olenoid

B. Paraboloid

C. Toroid

D. Cycloid

What is the correct answer?

4

What is the other name for dielectric strength?

A. Breakdown voltage

B. Electric intensity

C. Potential gradient

D. Dielectric constant

What is the correct answer?

4

Temporary magnets are commonly employed in

A. electric instruments

B. motors

C. moving coils loudspeakers

D. magnetos

What is the correct answer?

4

If on looking at any one end of a solenoid; the direction of current flow is found to be clockwise then the end under observation is a south pole. This is known as

A. Right hand rule

B. Left hand rule

C. Cork screw rule

D. End Rule

What is the correct answer?

4

The magnetic field of a magnetized iron bar when strongly heated

A. Becomes weaker

B. Becomes stronger

C. Reverses in direction

D. is unchanged

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

What is the correct answer?

4

The magnetic potential in a magnetic circuit can be measured in terms of

A. Mmf

B. Emf

C. Farad

D. Coulomb

What is the correct answer?

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

What is the correct answer?

4

A magnetic pole produces 5000 field lines. How much is the flux in webers? A. 50 × 10^-6

A. 5 × 10^-6

B. 500 × 10^-6

C. 500 × 10^-5

What is the correct answer?

4

Which of the following is used by permanent magnets as the magnetic material?

A. iron

B. nickel

C. soft steel

D. hardened steel

What is the correct answer?

4

What is the SI unit of reluctance?

A. At

B. At/m

C. N/Wb

D. At/Wb

What is the correct answer?

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

What is the correct answer?

4

The reluctance of a magnetic circuit varies with

A. length × area

B. area � length

C. length � area

D. length + area

What is the correct answer?

4

Electrons at the outer shell are called

A. Outer shell electrons

B. Inner shell electrons

C. Semiconductor electrons

D. Valence electrons

What is the correct answer?

4

What is the unit of reluctance?

A. Maxwell

B. Gauss

C. At/Wb

D. Weber

What is the correct answer?

4

The electric field intensity between the parallel plate air capacitor is 20 N/C. If an insulating slab of relative permittivity 5 is placed between the platesa then electric field intensity will be

A. 20 N/C

B. 100 N/C

C. 4N/C

D. 40 N/C

What is the correct answer?

4

The magnetic energy stored in an inductor is ______ current.

A. Directly proportional to

B. Inversely proportional to

C. Directly proportional to the square of

D. Inversely proportional to the square of

What is the correct answer?

4

If the right handed bottle-opener cork screw is assumed to be along the conductor so as to advance in the direction of current flow, the motion of its handle will indicate the direction of magnetic flux produced around the conductor. This is known as

A. Right hand rule

B. Left hand rule

C. Cork screw rule

D. End rule

What is the correct answer?

4

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

A.

B.

What is the correct answer?

4

Who developed the electromagnetic theory of light in 1862?

A. Heinrich Rudolf Hertz

B. Wilhelm Rontgen

C. James Clerk Maxwell

D. Andre Ampere

What is the correct answer?

4

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)

What is the correct answer?

4

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

What is the correct answer?

4

The temperature coefficient of resistance of a conductor ______ with an increase in temperature.

A. increases

B. decreases

C. remains the same

D. becomes negative

What is the correct answer?

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

What is the correct answer?

4

What is the typical saturation flux density for most magnetic materials?

A. 4 Wb/m^2

B. 5 Wb/m^2

C. 1 Wb/m^2

D. 2 Wb/m^2