EASY
12th ICSE
IMPORTANT
Earn 100

Compare frequency modulation and amplitude modulation. Explain why FM signal is less susceptible to noise than AM signal.

Important Questions on Communication Systems

EASY
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 22 - Communication Systems>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 1
The carrier frequency generated by a tank circuit containing 1 nF capacitor and 10 μH inductor is:
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 22 - Communication Systems>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 2
A radar has a power of 1 kW and is operating at a frequency of 10 GHz. It is located on a mountain top of height 500 m. The maximum distance upto which it can detect object located on the surface of the earth (Radius of earth=6.4×106 m) is:
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 22 - Communication Systems>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 3
A diode detector is used to detect an amplitude modulated wave of 60% modulation by using a condenser of capacity 250 pF in parallel with a load resistance 100 Ω. Find the maximum modulated frequency which could be detected by it:
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 22 - Communication Systems>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 4
A signal of 5 kHz frequency is amplitude modulated on a carrier wave of frequency 2 MHz. The frequencies of the resultant signal is:
HARD
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 22 - Communication Systems>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 5
Choose the correct statements:
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 22 - Communication Systems>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 6
In amplitude modulation, sinusoidal carrier frequency used is denoted by ωc and the signal frequency is denoted by ωm. The bandwidth ∆ωm of the signal is such that ∆ωm≪ωc. Which of the following frequency is not contained in the modulated wave?
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 22 - Communication Systems>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 7
A telephonic communication service is working at carrier frequency of 10 GHz. Only 10% of it is utilized for transmission. How many telephonic channels can be transmitted simultaneously if each channel requires a bandwidth of 5 kHz?
MEDIUM
12th ICSE
IMPORTANT
ISC Physics Class 12, Part-2>Chapter 22 - Communication Systems>For DIFFERENT COMPETITIVE EXAMINATIONS>Q 8
In a line of sight radio communication, a distance of about 50 km is kept between the transmitting and receiving antennas. If the height of the receiving antenna is 70 m, then the minimum height of the transmitting antenna should be:(Radius of the Earth=6.4×106 m).