Communication System Test

Result

Communication System Test - 26

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Weekly Quiz Competition

Question 1
4 / -1

A carrier is simultaneously modulated by two sine waves with modulation indices of 0.4 and 0.3. The resultant modulation index will be

A
1.0

B
0.7

C
0.5

D
0.35

Solution
Question 2
4 / -1

Mean optical power launched into an 8 km fibre is 120µW and mean output power is 4µW, then the overall attenuation is (Given log 30 = 1.477)

A
14.77 dB

B
16.77 dB

C
3.01 dB

D
None of these

Solution
Question 3
4 / -1

An antenna current of an AM broadcast transmitter modulated by 50% is 11 A. The carrier current is

A
10.35 A

B
9.25 A

C
10 A

D
5.5 A

Solution
Question 4
4 / -1

Because of tilting which waves finally disappear

A
Microwaves

B
Surface waves

C
Sky waves

D
Space waves
Question 5
4 / -1

A study of binary stars is most helpful in

A
Finding their distances

B
Finding their temperature

C
Finding their masses

D
Verifying Newton's force law of gravitation
Question 6
4 / -1

A group of bright and faint stars is called

A
Galaxy

B
Comet

C
Black hole

D
Constellation
Question 7
4 / -1

According to modern astronomers into how many constellations, the whole sky is divided

A
10¹¹

B
88

C
880

D
5000
Question 8
4 / -1

Which of the following theories is the most satisfactory about the origin of the universe?

A
Big Bang theory

B
Pulsating theory

C
Steady state theory

D
None of the above
Question 9
4 / -1

Which of the planet is brightest?

A
Mercury

B
Venus

C
Mars

D
Jupiter
Question 10
4 / -1

A star which appears blue will be

A
As hot as the sun

B
Cooler than the sun

C
Very cold indeed

D
Much hotter than the sun

User

Question Analysis

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Re-Attempt Weekly Quiz Competition

Communication System Test - 26

Result

Communication System Test - 26

Score

-

Rank

-

SHARING IS CARING

Question 1

1.0

0.7

0.5

0.35

Solution

Question 2

14.77 dB

16.77 dB

3.01 dB

None of these

Solution

Question 3

10.35 A

9.25 A

10 A

5.5 A

Solution

Question 4

Microwaves

Surface waves

Sky waves

Space waves

Question 5

Finding their distances

Finding their temperature

Finding their masses

Verifying Newton's force law of gravitation

Question 6

Galaxy

Comet

Black hole

Constellation

Question 7

1011

88

880

5000

Question 8

Big Bang theory

Pulsating theory

Steady state theory

None of the above

Question 9

Mercury

Venus

Mars

Jupiter

Question 10

As hot as the sun

Cooler than the sun

Very cold indeed

Much hotter than the sun

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

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10¹¹