IndiaBIX

Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 1
26.
The attraction between the nucleus and valence electron of copper atom is
zero
weak
strong
either zero or strong
Answer: Option
Explanation:

The valence electron, in copper atom, can be easily detached from nucleus.

27.
If the temperature of an extrinsic semiconductor is increased so that the intrinsic carrier concentration is doubled, then
the majority carrier density is doubled
the minority carrier density is doubled
the minority carrier density becomes 4 times the original value
both the majority and minority carrier densities double
Answer: Option
Explanation:

As the intrinsic carrier concentration is doubled, the concentration of both electrons and holes is doubled.

28.
There is no hysteresis phenomenon is any dielectric material.
True
False
Answer: Option
Explanation:

Hysteresis phenomenon exists in dielectic materials.

29.
The units of μ0 and μr are
H/m for both
H/m for μr and no units for μ0
H/m for μ0 and no units for μr
Wb/m for μ0 and no units for μr
Answer: Option
Explanation:

μr is only a numeric.

30.
In metals the valence electron wave functions are strongly perturbed by the presence of neighbouring atoms.
True
False
Answer: Option
Explanation:

In a metal valence electrons are shared by all atoms.

Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers