Which of the following statements is correct?
A) convex lens has positive focal power and concave lens have negative focal power
B) convex lens has negative focal power and concave lens have positive focal power
C) all lens have positive focal power
D) all lens have negative focal power
Correct Answer:
Verified
Q8: An FM radio receiver which is tuned
Q9: For telegraphy the most commonly used modulation
Q10: Commercial Frequency deviation of FM is
A)70 khz
B)75
Q11: The colour of an object is decided
Q12: In Pulse Code Modulation system
A)large bandwidth is
Q14: In Modulation, "carrier" is
A)resultant wave
B)speech voltage to
Q15: To eliminate ghosts in the picture
A)use a
Q16: The frequency range of 300 kHz to
Q17: Which of the following does not cause
Q18: A telephone channel requires a bandwidth of
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