Communication System Test

Result

Communication System Test - 6

Score
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Rank
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TIME Taken - -

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Weekly Quiz Competition

Question 1
4 / -1

A broken ligament is being welded back in place using 20 ms pulses from a 0.5 W laser operating at a wavelength of 632 nm. The number of photons in 5 pulses of laser are

A
1.59 × 10^-18

B
3.18 × 10^-17

C
1.59 × 10²³

D
3.18 × 10¹⁶
Question 2
4 / -1

A laser beam is used for carrying out surgery because it

A
is highly monochromatic

B
is highly coherent

C
is highly directional

D
can be sharply focused
Question 3
4 / -1

Which of the following is not the main characteristic of laser beam?

A
High irradiance

B
High divergence

C
Highly monochromatic

D
Highly coherent
Question 4
4 / -1

In ruby laser, the stimulated emission is due to transition from

A
metastable state to any lower state

B
any higher state to lower state

C
metastable state to ground state

D
any higher state to ground state
Question 5
4 / -1

A laser beam of pulse power 10¹² W is focused on an object of area 10^-4cm². The energy flux in Watt cm^-2. The energy flux in Watt cm^-2 at the point of focus is

A
10²⁰

B
10¹⁶

C
10⁸

D
10⁴

Solution
Question 6
4 / -1

A laser device produces amplification in the

A
microwave region

B
ultraviolet or visible region

C
infrared region

D
None of the above
Question 7
4 / -1

According to Hubble\'s law , the red-shift (z) of a receding galaxy and its distance r from earth are related as

A
z ∝ r

B

C

D
z ∝ r^3/2
Question 8
4 / -1

The velocity of a particle at which the kinetic energy is equal to its rest energy is

A

B

C

D
Question 9
4 / -1

Two electrons are moving in a opposite direction with speeds 0.8c and 0.4c, where c is the speed of light in vacuum. Then, the relative speed is about

A
0.4 c

B
0.8 c

C
0.9 c

D
1.2 c
Question 10
4 / -1

For a body moving with relativistic speed, if the velocity is doubled, then

A
its linear momentum is doubled

B
its linear momentum will be less than double

C
its linear momentum will be more than double

D
its linear momentum remains unchanged