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Universe Physics - Universe

CBSE - STD 12 Science - Physics (CBSE - English Medium). 62 questions in this chapter.

Question types

Universe question types

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

62
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
The wavelength of maximum energy, released during an atomic explosion, was $2.93 × 10$$^{-{10}}$ m. Given that the Wien's constant is $2.93 × 10$$^{-{3}}$ m K, the maximum temperature attained must be of the order of
  • A
    $10^{-7}\, K$
  • ✓
    $10^7\, K$
  • C
    $10^{-13}\,K$
  • D
    $5.86 ×10^{7}\, K$

Answer: B.

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Q 2M.C.Q (1 Marks)1 Mark
A planet of mass $M$ has a satellite of mass m, revolving around the planet in a circular orbit of radius $r$ and time period $T$ . The mass $(M)$ of the planet is
  • ✓
    $\frac{{4{\pi ^2}{r^3}}}{{G{T^2}}}$
  • B
    $\frac{{4{\pi ^2}{r^2}}}{{G{T^3}}}$
  • C
    $\frac{{G{T^2}}}{{4\pi {r^3}}}$
  • D
    $\frac{{{r^3}G}}{{4\pi {T^2}}}$

Answer: A.

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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
    l
  • C
    ${m^{1/2}}$
  • ✓
    ${m^{ - 1/2}}$

Answer: D.

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Q 4M.C.Q (1 Marks)1 Mark
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
    $-1.25$
  • ✓
    $-1.5$
  • C
    $-1.75$
  • D
    $-2$

Answer: B.

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Q 5M.C.Q (1 Marks)1 Mark
A particular emission line, detected in the light from a galaxy, has a wavelength $\lambda ' = 1.1\lambda $, where $\lambda $ is the proper wavelength of the line. The galaxy distance from us
  • ✓
    $1.6 \times {10^9}ly$
  • B
    $0.97 \times {10^9}ly$
  • C
    $2.4 \times {10^9}ly$
  • D
    $1.62 \times {10^{11}}ly$

Answer: A.

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