1000+ Physics Questions and Answers for Competitive Exams - 1
Question: 1
In television transmission, sound signals are
(A) phase modulated
(B) amplitude modulated
(C) frequency modulated
(D) either amplitude modulated or frequency modulated
Ans: C
frequency modulated
Question: 2
In a monochrome picture tube, the face in front of the picture tube is coated internally with
(A) metal oxide
(B) graphite
(C) iron oxide
(D) phosphor
Ans: D
phosphor
Question: 3
A high negative potential applied to the control grid of the electron gun, to prevent the emission of electrons from it is called
(A) blanking pulse
(B) timer pulse
(C) line synchronising pulse
(D) frame synchronising pulse
Ans: A
blanking pulse
Question: 4
The amplitude of the modulated wave possesses the
(A) phase of the carrier wave
(B) phase of the audio signal wave
(C) frequency of the carrier wave
(D) frequency of the audio signal wave
Ans: D
frequency of the audio signal wave
Question: 5
In television systems, the frame repetition rate is referred to as
(A) pulse frequency
(B) transmission frequency
(C) picture frequency
(D) scanning frequency
Ans: D
scanning frequency
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