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CBSE - Class 12 Physics Communication Systems Worksheet
Figure 15.3 shows a communication system. What is the output power when input signal is of 1.01mW? (gain in dB = (10 \log_{10}(P_{o}/P_{i}))).
Everyone ________ Dr. Smithers agreed to take part in the procedure.
accept
b.expect
An amplitude modulated wave is as shown in Fig. 15.4. Calculate (iii) peak value of information voltage.
For my birthday, I wanted to buy a new dress, go to a restaurant, and see a movie.
NO CHANGE
b.have gone to a restaurant, and seen
c.went to a restaurant, and saw
d.went to a restaurant, and have seen
Randolph ________ my invitation to dinner.
accepted
b.expected
There's not point in calling. She __________ home yet.
Won't have arrived
b.Won't arrive
c.Won't be arriving
d.Won't have been arriving
For each of the following, choose the sentences in which the subject and verb agree.
Every one of the shirts has a green collar.
b.Every one of the shirts have a green collar.
________ been three days since I have heard from Joe.
It's
b.Its
Your kindness will leave a lasting ________ on me.
affect
b.effect
An amplitude modulated wave is as shown in Fig. 15.4. Calculate (ii) peak carrier voltage and,
Figure 15.3 shows a communication system. What is the output power when input signal is of 1.01mW? (gain in dB = $10 \log_{10}(\frac{P_o}{P_i})$).
I-V characteristics of four devices are shown in Fig. 15.1 Identify devices that can be used for modulation:
‘i’ and ‘iii’.
b.only ‘iii’.
c.‘ii’ and some regions of ‘iv’.
d.All the devices can be used.
Experienced journalists will demonstrate talent in writing, dexterity with various topics, and how they are able to find interesting materials.
NO CHANGE
b.how to be able
c.ability
d.they are able
For each of the following, choose the sentences in which the subject and verb agree.
This singer, along with a few others, play the harmonica on stage.
b.This singer, along with a few others, plays the harmonica on stage.
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