Class 12

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Q1.

$A$ bright star is indicated to have a brightness magnitude of $-5$ compared to a star of brightness zero magnitude. It means that this star,compared to the reference star of zero brightness,is:

(A)

$100$ times less bright

(B)

$5$ times more bright

(C)

$5$ times less bright

(D)

$100$ times more bright

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Q2.

$A$ galaxy is observed to be moving with a velocity of $8600 \ km \ s^{-1}$. If it is at a distance of $430$ million light-years from us,the Hubble constant and the corresponding age of the universe are respectively:

(A)

$2 \times 10^{-5} \ km \ s^{-1} \ ly^{-1}, \ 1.49 \times 10^{10} \ \text{years}$

(B)

$2 \times 10^{-6} \ km \ s^{-1} \ ly^{-1}, \ 1.58 \times 10^3 \ \text{years}$

(C)

$10^6 \ km \ s^{-1} \ ly^{-1}, \ 1.49 \times 10^{10} \ \text{years}$

(D)

None of these

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