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Universe Physics - Universe

Rajasthan Board (RBSE) - STD 12 Science - Physics (Rajasthan - English Medium). 72 questions in this chapter.

Question types

Universe question types

72 questions across 1 question group — pick any mix to generate a Physics paper with step-by-step answer keys.

72
Questions
1
Question groups
5
Question types
Sample Questions

Universe questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1M.C.Q (1 Marks)1 Mark
A galaxy is observed to be moving with a velocity of $8600 \mathrm{~km}-\mathrm{sec}^{-1}$. If it is at a distance of $430$ million light year from us, Hubble constant and corresponding age of the universe are respectively
  • A
    $2 \times 10^{-5} \frac{\mathrm{kms}^{-1}}{\mathrm{ly}} \times 10^{10}$ year
  • ✓
    $2 \times 10^{-6} \frac{\mathrm{kms}^{-1}}{\mathrm{ly}} \times 10^3$ year
  • C
    $10^6 \frac{\mathrm{kms}^{-1}}{\mathrm{ly}}, 1.49 \times 10^{10}$ year
  • D
    None of these

Answer: B.

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Q 2M.C.Q (1 Marks)1 Mark
Assertion :   Moon is seen as it partly reflects the sun light falling on it
Reason     :  Moon is a satellite of earth. It does not emit light of its own(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.
 
 
 
 
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Q 3M.C.Q (1 Marks)1 Mark
A double star is a system of two stars rotating about their centre of mass only under their mutual gravitational attraction. Let the star have mass $m$ and $2m$ and their separation be $l.$ Their time period of rotation about their centre of mass will be proportional to
  • A
    $l^{2 / 3}$
  • B
    $1$
  • C
    $\mathrm{m}^{1 / 2}$
  • ✓
    $\mathrm{m}^{-1 / 2}$

Answer: D.

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Q 4M.C.Q (1 Marks)1 Mark
Assertion  :   Sun is at the galactic centre C of the milky way
Reason      :  All planets of solar system revolve around the sun.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If assertion is false but reason is true.
 
 
 
 
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Q 5M.C.Q (1 Marks)1 Mark
Assertion  :   There is no atmosphere on moon
Reason      : Escape velocity at the surface of moon is low.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.
 
 
 
 
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