Physics M.C.Q (1 Marks)

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.

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.

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.

Assertion :   A star which appears blue will be much hotter than the sun
Reason     : It is based on Wien's law(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.

Assertion : The comet do not obey Kepler's laws of planetary motion
Reason     :  The comet do not have elliptical orbit(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.

The difference in the lengths of a mean solar day and a sidereal day is about(a) 1 min(b) 4 min(c) 15 min(d) 56 min

Suppose a planet goes around Sun with a linear speed twice as fast that of earth. What will be it's orbit size as compared to that of earth ? (Radius of earth = R)(a) R / 4  (b) R / 2(c) R (d) 2R

The percentage of Sun's total energy which reaches the earth's surface is

Fraunhofer lines of the solar system is an example of(a) Emission spectrum(b) Emission band spectrum(c) Continuous emission spectrum(d) Line absorption spectrum

Assertion :   A pulsor is a source of radio waves which change in terms of intensity at regular interval of time
Reason     : A pulsor is a rotating neutron star(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.

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

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  (b) – 1.5(c) – 1.75(d) – 2

Assuming that the dimmest visible star to the naked eye has a magnitude of about 6. Brightness of planet Venus (magnitude = – 4) w.r.t. this star is(a) 10,000 times brighter(b) 2000 times brighter(c) 15000 times brighter(d) 4000 times brighter

Assertion :   The stars twinkle while the planets do not.
Reason     :  The stars are much bigger in size than the planets.(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.

Hubble's law is related with (a) Comet(b) Speed of galaxy (c) Black hole(d) Planetary motion

The colour of a star is an indication of its   (a) Weight(b) Distance(c) Surface temperature(d) Size

Surface temperature of the sun is of the order of(a) 5000 K(b) 7000 K(c) 6000 K(d) 12000 K

Great bear is a(a) Star(b) Galaxy(c) Constellation(d) Planet

Speed of recession of galaxy is proportional to it's distance(a) Directly(b) Inversely(c) Exponentially(d) None of these

The galaxies are moving away from each other. It is explained by (a) White dwarf star(b) Red shift(c) Neutron star(d) None of these

In determining the temperature of a distant star, one makes use of (a) Kirchhoff's law(b) Stefan's law(c) Wien's displacement law(d) None of these

Smaller pieces of heavy stones and metals which on entering earth's atmosphere burns out are (a) Comets(b) Meteorites(c) Asteroids(d) All of these

Which one of the following is known as Saptarishi (a) Orion (b) Ursa major(c) Ursa minor(d) Scorpion

Which one of the following planet has the longest day (a) Venus(b) Mars(c) Mercury(d) Earth

The tail of the comet is due to(a) Vaporisation of water on the comet(b) Sublimation of vapour in the comet(c) Cooling of water in the comet(d) Vaporisation of heat in the comet

The motion of planets in the solar system is an example of conservation of (a) Mass (b) Momentum(c) Angular momentum(d) Kinetic energy

When original mass of star is greater than 5 M (M = mass of the sun). The death of this star will give rise to (a) White dwarf(b) Black hole(c) Quasars(d) Nebula

Albedo is maximum for(a) Pluto(b) Venus(c) Earth(d) Mercury

Two stars P and Q are observed at night. Star P appears reddish while, star Q is white. From this we conclude(a) Temperature of Q is higher than that of P (b) Temperature of Q is lower than that of P (c) Star Q is at the same distance at that of star P(d) Star P is farther than star Q

How does the red shift confirms that the universe is expanding (a) Due to Wien's law(b) Due to Stefan's law(c) Due to Kirchhoff's law(d) Due to Doppler's effect

Which of the following helps us in the determination of the temperature of sun(a) Kirchhoff's law(b) Maxwell Boltzmann law(c) Planck's law(d) Stefan's law

Meteors are (a) Small stars(b) Burnt pieces of comets that fall on earth(c) Comets without tails(d) None of these

'Albedo' is (a) Reflecting power of a heavenly body(b) Transmitive power of a heavenly body(c) Absorptive power of a heavenly body(d) Refracting power of a heavenly body

A star which appears blue will be (a) As hot as the sun(b) Cooler than the sun(c) Very cold indeed(d) Much hotter than the sun

The sun emits a light with maximum wavelength 510 mm while another star X emits a light with maximum wavelength of 350 nm. What is the ratio of surface temperature of sun and the star X (a) 2.1(b) 0.68(c) 0.46(d) 1.45

An extremely hot star would appear to be(a) Red   (b) Blue(c) Yellow(d) Orange

Which of the nine planets is nearest to sun (a) Venus                                          (b) Mercury(c) Mars (d) Jupiter

The length of Milky way is (a) 100,000 light years(b) 10,000 light years(c) 1000 light years(d) 100 light years

Period of revolution increases in the order of (a) Saturn, Uranus, Venus(b) Mars, Saturn, Pluto(c) Mercury, Neptune, Mars(d) Mars, Jupiter, Venus

Towards the centre of sun(a) Density decreases(b) Pressure decreases(c) Temperature decreases(d) Density and pressure increases

The hottest planet of solar system is(a) Mars (b) Mercury(c) Venus(d) Pluto

Hubble's law states that the velocity with which the 'milky way' is moving away from the earth is proportional to(a) Square of the distance of the milky way from the earth(b) Distance of milky way from the earth(c) Mass of the milky way(d) Product of the mass of the milky way and its distance from the earth

According to the pulsating theory the expansion and contraction of the universe repeats after every (a) 11 years(b) 8 billion years(c) 8 million years(d) 80 billion years

Which of the following planets have rings around it(a) Uranus(b) Mars(c) Jupiter(d) Saturn

There is no atmosphere on moon because(a) There is no vegetation(b) The escape velocity at its surface is very low(c) Diffusion constant of gases is high(d) There is vacuum in space

Which of the following is coldest planet(a) Mercury(b) Pluto(c) Earth (d) Venus

Venus appears brighter than other stars because (a) It is heavier than other planets (b) Its density is more than other planets (c) It is nearer to earth in comparison to other planets (d) Nuclear fusion takes place at its surface

Sun radiates continuously and maintains its brightness because(a) Helium is converted into iron in its core(b) Of fusion of hydrogen nuclei into helium(c) Fusion of helium in hydrogen(d) Burning of carbon, in its core

Asteroids are (a) Small planets(b) Shooting stars (c) Found in a belt between Earth ad Venus(d) None of these

Source of Sun's energy is (a) Burning of hydrogen(b) Fission reactions involving hydrogen(c) Fusion reactions involving hydrogen(d) Some other source

Black hole is a (a) Hole in the ozone layer of atmosphere(b) Hole in earth's centre(c) Highly dense matter available in the atmosphere(d) Hole in troposphere 

Hubble showed that the universe as a whole is expanding and the distant stars are receding from us. The spectral line from a star, when compared with the corresponding line from an source will then show(a) A shift in frequency towards the red end(b) A shift in frequency towards the violet end(c) No shift in frequency at all(d) A shift in frequency towards the violet end as well as a decrease in intensity

The age of universe is believed to be (a) 1 billion years(b) 10 billion years(c) 10-20 billion years(d) 1000 billion years

A study of binary stars is most helpful in(a) Finding their distances(b) Finding their temperature(c) Finding their masses(d) Verifying Newton's force law of gravitation

A group of bright and faint stars is called(a) Galaxy(b) Comet(c) Black hole(d) Constellation

According to modern astronomers into how many constellations, the whole sky is divided

Which of the following theories is the most satisfactory about the origin of the universe (a) Big Bang theory (b) Pulsating theory(c) Steady state theory (d)  None of these

Assertion : Red shift confirms that the universe is expanding
Reason     :  Wavelength of red light is maximum in the visible region(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.

A planet which is born sister of earth is(a) Mercury(b) Venus(c) Mars(d) Jupiter

Mass of earth has been determined through

Which of the planet is brightest(a) Mercury(b) Venus(c) Mars(d) Jupiter