Communication System Test

Result

Communication System Test - 30

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Weekly Quiz Competition

Question 1
4 / -1

The colour of a star is an indication of its

A
Weight

B
Distance

C
Surface temperature

D
Size

Solution
Question 2
4 / -1

Which of the following is coldest planet?

A
Mercury

B
Pluto

C
Earth

D
Venus
Question 3
4 / -1

The sun revolves around the galaxy with a speed of 250 km/sec and and it\'s radius is 3 × 10⁴ light year. The mass of the milky way is

A
3 × 10⁴⁰ kg

B
3 × 10⁴¹ kg

C
5 × 10⁴⁰ kg

D
6 × 10⁴¹ kg

Solution
Question 4
4 / -1

There are certain types of stars called visible stars which undergo periodic change in their light output. If such a star quadruple it\'s light output, how much does it\'s magnitude change?

A
–1.25

B
–1.5

C
–1.75

D
–2

Solution
Question 5
4 / -1

A particular emission line, detected in the light from a galaxy, has a wavelength λ\' = 1.1 λ, where λ is the proper wavelength of the line. The galaxy distance from us

A
1.6 × 10⁹ ly

B
0.97 × 10⁹ ly

C
2.4 × 10⁹ ly

D
1.62 × 10¹¹ ly

Solution
Question 6
4 / -1

Assuming that the dimmest visible star to the naked eye has a magnitude of about 6. Brightness of planet Venus (magnitude = –4) w.r.t. this star is

A
10,000 times brighter

B
2000 times brighter

C
15000 times brighter

D
4000 times brighter

Solution
Question 7
4 / -1

A galaxy is observed to be moving with a velocity of 8600 km/sec^–1. If it is at a distance of 430 million light year from us, Hubble constant and corresponding age of the universe are respectively

A

B

C

D
None of these

Solution
Question 8
4 / -1

Consider a binary star system consisting of two stars of masses M₁ and M₂ separated by a distance of 30 AU with a period of revolution equal to 30 years. If one of the two stars is 5 times farther from the centre of mass than the other. The masses of the two stars in terms of solar masses are

A
5, 15

B
25, 5

C
25, 10

D
7, 25

Solution
Question 9
4 / -1

A planet of mass m moves in an ellipse around the sun of mass M_s so that its maximum and minimum distances are r₁ and r₂ respectively. The angular momentum of the planet relative to the centre of the sun is

A

B

C

D

Solution
Question 10
4 / -1

The Percentage of Sun\'s total energy which reaches the earth\'s surface is

A
10^–7 %

B
10^–6%

C
10^–3 %

D
10^–2 %

Solution