Question

1. A) Which of the followings is true about the two statements below?

(i) A capacitor has low reactance at high frequency.

(ii) An inductor has low reactance at low frequency.

(A)Both are true

(B)Both are false

(C)Only (i) is true

(D) Only (ii) is true

B) If you have to choose a laser for a high-data-rate fiber optic communication system, which of the following should you choose?

Group of answer choices

A)Red laser

B)Green laser

C)Blue laser

(D)They are all the same

C) Which type of radiation(s) can be used to examine the structure of bacteria? Check all that applies.

Radio waves

Microwaves

Infrared

Visible light

UV light

X-rays

Answer 1

Answer:

Qn A)

Capacitive reactance Xc = 1/C = 1/(C x 2n ) where n  is the frequency and C is the capacitance

Xc 1/ n

Therefore when n increases Xc decreases

Inductive reactance XL   = L = L x 2n where L is the inductance

XL    n

Therefore when n decreses XL decreases

Therefore Option (A) is the correct Answer

Qn B )

High data optical fibre communication use Helium - Neon Lasers. A helium Neon Laser is tunable from infrared to various visible light frequencies.

Therefore Option ( D ) is correct

Qn C)

Considering theaverage size of the bacteria as 0.2 micro metro to 2 micrometre and the waelength of EM waves,  either visible light or infrared can be used to study the structure of bacteria