JEE Questions for Physics Communication System Quiz 10 - MCQExams.com

There is no atmosphere on moon because
  • There is no vegetation
  • The escape velocity at its surface is very low
  • Diffusion constant of gases is high
  • There is vacuum in space
Which of the following planets have rings around it?
  • Uranus
  • Mars
  • Jupiter
  • Saturn
Towards the centre of sun
  • Density decreases
  • Pressure decreases
  • Temperature decreases
  • Density and pressure increases
Period of revolution increases in the order of
  • Saturn, Uranus, Venus
  • Mars, Saturn, Pluto
  • Mercury, Neptune, Mars
  • Mars, Jupiter, Venus
The length of Milky way is
  • 100,000 light years
  • 10,000 light years
  • 1000 light years
  • 100 light years
Which of the nine planets is the nearest to sun?
  • Venus
  • Mercury
  • Mars
  • Jupiter
According to the pulsating theory the expansion and contraction of the universe repeats after every
  • 11 years
  • 8 billion years
  • 8 million years
  • 80 billion years
Meteors are
  • Small stars
  • Burnt pieces of comets that fall on earth
  • Comets without tails
  • None of the above
Two stars P and Q are observed at night. Star P appears reddish while, star Q is white. From this we conclude
  • Temperature of Q is higher than that of P
  • Temperature of Q is lower than that of P
  • Star Q is at the same distance at that of star P
  • Star P is farther than star Q
Albedo is maximum for
  • Pluto
  • Venus
  • Earth
  • Mercury
When original mass of star is greater than 5 M (M= mass of the sun). The death of this star will give rise to
  • White dwarf
  • Black hole
  • Quasars
  • Nebula
The tail of the comet is due to
  • Vaporisation of water on the comet
  • Sublimation of vapour in the comet
  • Cooling of water in the comet
  • Vaporisation of heat in the comet
In our solar system, there is one sun and
  • Seven planets
  • Nine planets
  • Eleven planets
  • Indefinite number of planets
In determining the temperature of a distant star, one makes use of
  • Kirchhoff's law
  • Stefan's law
  • Wien's displacement law
  • None of the above
The motion of planets in the solar system is an example of conservation of
  • Mass
  • Momentum
  • Angular momentum
  • Kinetic energy
Mass of earth has been determined through
  • Use of Kepler's T2/R constancy law
  • Sampling the density of earth's crust and using R
  • Cavendish's determination of G and using R and ‘g’ at the surface
  • Use of periods of satellites at different heights above earth's surface
The galaxies are moving away from each other. It is explained by
  • White dwarf star
  • Red shift
  • Neutron star
  • None of these
Speed of recession of galaxy is proportional to It\'s distance
  • Directly
  • Inversely
  • Exponentially
  • None of these
Great bear is a
  • Star
  • Galaxy
  • Constellation
  • Plane
Surface temperature of the sun is of the order of
  • 5000 K
  • 7200 K
  • 6000 K
  • 12000 K
The colour of a star is an indication of its
  • Weight
  • Distance
  • Surface temperature
  • Size
Which of the following is coldest planet?
  • Mercury
  • Pluto
  • Earth
  • Venus
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
  • 3 × 1040 kg
  • 3 × 1041 kg
  • 5 × 1040 kg
  • 6 × 1041 kg
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?
  • –1.25
  • –1.5
  • –1.75
  • –2
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
  • 1.6 × 109 ly
  • 0.97 × 109 ly
  • 2.4 × 109 ly
  • 1.62 × 1011 ly
Assuming that the dimmest visible star to the naked eye has a magnitude of about 6. Brightness of planet Venus (magnitude = –w.r.t. this star is
  • 10,000 times brighter
  • 2000 times brighter
  • 15000 times brighter
  • 4000 times brighter
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

  • Physics-Communication System-64332.png
  • 2)
    Physics-Communication System-64333.png

  • Physics-Communication System-64334.png
  • None of these
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
  • 5, 15
  • 25, 5
  • 25, 10
  • 7, 25
A planet of mass m moves in an ellipse around the sun of mass Ms 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

  • Physics-Communication System-64337.png
  • 2)
    Physics-Communication System-64338.png

  • Physics-Communication System-64339.png

  • Physics-Communication System-64340.png
The Percentage of Sun\'s total energy which reaches the earth\'s surface is
  • 10–7 %
  • 10–6%
  • 10–3 %
  • 10–2 %
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