1000+ TNPSC Physics Gk Questions and Answers - 2

Question: 6

Usually radiowaves travel in

(A) the form of compressions and rarefactions

(B) parabolic path

(C) curved path

(D) straight line

Question: 7

The main purpose of modulation is to

(A) produce side bands

(B) transmit low frequency information over long distances efficiently

(C) acquire wave shaping of the carrier wave

(D) combine two waves of different frequencies

Question: 8

In phase modulation

(A) there is no change in the frequency and phase of the carrier wave

(B) both the phase and the frequency of the carrier wave varies

(C) only the phase of the carrier wave varies

(D) only the frequency of the carrier wave varies

Question: 9

The portion of the Earth’s atmosphere which extends upto 15 km from the surface of the earth is

(A) troposphere

(B) photosphere

(C) chromosphere

(D) stratosphere

Question: 10

When phosphor coating in the monochrome picture tube is struck by the electron beam, it produces _____ light.

(A) green

(B) white

(C) red

(D) blue