National Level Online Quiz on Applied Physics

 

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