National Level Online Quiz on Applied Physics

Question : 1). The
de-Broglie wavelength is infinity when the speed of the matter particle is

Answer : A) 0

Question : 2).If ΔE and
Δt are the uncertainties in the measurement of energy and time of a system,
according to Heisenberg’s uncertainty principle

Answer : A) ΔE.Δt ≥ h/4π

Question : 3).Wave
function is the

Answer : B) Probability amplitude of
finding the particle in space

Question : 4).
Piezoelectric effect is the production of electricity by

Answer : D) Pressure

Question : 5). Electrical
conductivity of a semiconductor at absolute zero of temperature is

Answer : D) zero

Question : 6). Zener
diodes with breakdown voltages less than 5 V operate predominantly in what type
of breakdown?

Answer : b) Zener

Question : 7). If the
hall coefficient is negative then the semi conductors is

Answer : b) n-type

Question : 8). The
electric current in a pure semi conductor when an voltage is applied, is due to

Answer : B) electrons and holes

Question : 9). The
characteristic of a p-n diode is,

Answer : c) It acts like a rectifier

Question : 10).for p-type
semiconductor_____type of atoms are added to Si

Answer : A) trivalent

Question : 11). Which has
higher current gain

Answer : d) Avalanche photodiode

Question : 12).A solar
Cell is an example of

Answer : B) Photo conductive cell

Question : 13). The
majority cariers of p-material is

Answer : A) Holes

Question : 14).
Attenuation in an optical fiber is a function of

Answer : (A) Fiber material only

Question : 15). Cladding
in the optical fiber is mainly due to

Answer : d) To provide
proper electromagnetic guidance

Question : 16). In
computer __________________laser is used

Answer : (c) Semi conductor

Question : 17). Laser
radiation is ____

Answer : (d) all

Question : 18).The unit
for relative permittivity is

Answer : D) Dimentionless

Question : 19).
Dielectrics are

Answer : D) Insulators

Question : 20). In the
absence of external electric field,the electric dipoles in a dipolar substance
are

Answer : C) Randomly
oriented