Communication System Test

Result

Communication System Test - 32

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Weekly Quiz Competition

Question 1
4 / -1

Suppose the sun was located at the position occupied by the nearest star, say, alphacenturi 4 light years away. By what factor the solar radiation received per sec per unit area decrease

A
1.5 × 10^–6

B
1.5 × 10^–8

C
1.5 × 10^–9

D
1.5 ×10^–11

Solution
Question 2
4 / -1

If a galaxy is at a distance 430 million light years from us, determine Hubble\'s constant. Its speed being 6.48 × 10⁶ ms^–1

A
16 kms^–1 per million light year

B
15 kms^–1 per million light year

C
14 kms^–1 per million light year

D
None of the above

Solution
Question 3
4 / -1

A
7.5

B
10²

C
10³

D
10^7.5

Solution
Question 4
4 / -1

A body at 1500 K° emits maximum energy at a wavelength 20,000 Å. If the Sun emits maximum energy at wavelength 5500 Å, then the temperature of Sun is

A
5454

B
4454

C
4550

D
5400

Solution
Question 5
4 / -1

The hottest type of stars are called

A
A type

B
B type

C
O type

D
M type
Question 6
4 / -1

If angular diameter of Sun is about 30’ and it\'s distance from earth is 1.5 × 10¹¹ m, then solar diameter is

A
1.1 × 10⁷ m

B
1.5 × 10⁸ m

C
1.4 × 10⁹ m

D
1.9 × 10¹¹ m

Solution
Question 7
4 / -1

The death of a star results is a neutron star if the original mass of star in terms of mass of Sun (M) is

A
Less than 2M

B
Between 2M and 4M

C
Greater than 5 M

D
Exactly equal to M
Question 8
4 / -1

The tail of a comet points

A
Towards the Sun

B
Away from the Sun

C
In arbitrary

D
Away from the earth
Question 9
4 / -1

The number of stars in our solar system is

A
9

B
5

C
1

D
More than 9
Question 10
4 / -1

In short wave communication, waves of which of the following frequencies will be reflected back by the Ionospheric layer, having electron density 10¹¹ per m³

A
2 MHz

B
10 MHz

C
12 MHz

D
18 MHz

Solution