4 FEBRUARY 2021 CURRENT AFFAIRS QUIZ

Maximum number of electrons in a sub-shell with l = 3 and n = 4 is

8.

14.

20.

10.

TRUE ANSWER : ?
YOUR ANSWER : ?

The number of rings in the Bohr model of any element is determined by what?

Column number on periodic table.

Row number on periodic table.

Atomic mass.

Atomic number.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which statement is not true of ferromagnetic materials.

They have large magnetic susceptibility.

They lose their nonlinearly property above the Curie temperature.

They have fixed value of μr.

Energy loss is proportional to the area of hysteresis loop.

TRUE ANSWER : ?
YOUR ANSWER : ?

The temperature beyond which substances lose their ferroelectric properties, is known as

inversion temperature.

critical temperature.

curie temperature.

conversion temperature.

TRUE ANSWER : ?
YOUR ANSWER : ?

Magnetic recording tape is most commonly made from

ferric-oxide.

small particles of iron.

iron-dust.

silicon-iron.

TRUE ANSWER : ?
YOUR ANSWER : ?

A degaussing is the process of

removing gases from materials.

removal of magnetic impurities.

demagnetising metallic parts.

remagnetising metallic parts.

TRUE ANSWER : ?
YOUR ANSWER : ?

The atomic radius in case of face centered cubic lattice is

a / 3.

a / 2.

a / 4.

a.

TRUE ANSWER : ?
YOUR ANSWER : ?

Absolute permittivity of a dielectric medium is represented by

εr / εo.

None of these

εoεr.

εo / εr.

TRUE ANSWER : ?
YOUR ANSWER : ?

Materials having a high dielectric constant, which is non-linear, are known as

super die-electrics.

ferroelectric materials.

hard die-electrics.

elastomers.

TRUE ANSWER : ?
YOUR ANSWER : ?

The intensity of magnetization, M, of a ferro magnetic solid

decreases with increasing temperature.

is independent of temperature.

increases with increasing temperature.

depends on method of heating.

TRUE ANSWER : ?
YOUR ANSWER : ?

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