Tag: shadow formation and optical medium

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Questions Related to shadow formation and optical medium

Multiple choice physics gravitation elementary ideas of astronomy shadow formation and optical medium light and shadow

Following factors may be responsible for the colour of a star.
I. The size of the star
II. The distance of the star from the earth
III. The surface temperature of the star
Which combination is correct?

  1. III only

  2. II only

  3. I and II only

  4. I, II and III
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Factor responsible for colour of the star is surface temperature of the star it does not depend upon size of the star and distance of star from the earth.

Multiple choice physics gravitation elementary ideas of astronomy shadow formation and optical medium light and shadow

Who is known as father of Modern Indian Astronomy?

  1. Venkoji Bapu Ketkar

  2. Meghnath Saha

  3. M.K. Vainu Bappu

  4. Dr. S. Chandrashekhar
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Manali Kallat Vainu Bappu or M.K Vainu Bappu is known the father of Modern Indian Astronomy. He along with American astronomer Olin Chaddock Wilson discovered the Wilson-Bapu effect in 1957.  

Thus, the correct answer is 'M.K. Vainu Bappu.'

Multiple choice physics gravitation elementary ideas of astronomy shadow formation and optical medium light and shadow

Suppose an earth satellite, revolving in a circular orbit experiences a resistance due to cosmic dust. Then.

  1. Its kinetic energy will increase

  2. Its potential energy will decrease

  3. It will spiral towards the earth and in the process its angular momentum will remain conserved

  4. Both a and b is correct
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
The Kinetic energy of the satellite increases in spiral path as it approach the earth so $V$ must increase the total mechanical energy of the satellite decreases due to resistance from conic dust as satellite approaches earth so potential energy decreases.
Thus Kinetic energy increase potential energy decreases.
Multiple choice physics gravitation elementary ideas of astronomy shadow formation and optical medium light and shadow

The Halley's comet appears after every

  1. $72$ years
  2. $74$ years
  3. $75$ years
  4. $78$ years
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Halley's comet appears after every  $75$ years.

Halley's Comet is arguably the most famous comet. It is a "periodic" comet and returns to Earth's vicinity about every $75$ years, making it possible for a human to see it twice in his or her lifetime. The last time it was here was in 1986, and it is projected to return in $2061.$

The comet is named after English astronomer Edmond Halley, who examined reports of a comet approaching Earth in $1531, 1607$ and $1682$. He concluded that these three comets were actually the same comet returning over and over again, and predicted the comet would come again in $1758$.

Multiple choice physics effects of light eclipses elementary ideas of astronomy shadow formation and optical medium

What is known as an eclipse?

  1. Astronomical event when one celestial body partially or totally cover another celestial object

  2. Astronomical event when one celestial body cover another meteor

  3. Astronomical event when one meteor partially or totally cover another meteor

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An eclipse is an event where one heavenly body compeletely or partially blocks the light from the other heavenly body.

Multiple choice physics effects of light eclipses elementary ideas of astronomy shadow formation and optical medium

Which type of eclipse is known when Earth, Moon and Sun doesn't align in straight line and Moon only partially covers sun?

  1. Total Solar Eclipse

  2. Partial Solar Eclipse

  3. Annular Solar Eclipse

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When Moon is between the Sun and the Earth but doesn't align in a straight line results in a partial solar eclipse.

Partial Solar Eclipse is known when Earth, Moon and Sun doesn't align in straight line and Moon only partially covers sun.

Multiple choice physics effects of light eclipses elementary ideas of astronomy shadow formation and optical medium

State whether the given statement is true or false :

Looking at a solar eclipse without any protective eyewear can severely harm your eyes. 

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Looking at a solar eclipse without any protective eyewear can severely harm your eyes. It is safe to look at the Sun during the total solar eclipse since Moon cover the Sun totally. However, it is not safe to look at the Sun during solar eclipse, other than the total solar eclipse.

Multiple choice physics effects of light eclipses elementary ideas of astronomy shadow formation and optical medium

What is solar eclipse?

  1. When Earth, Moon and Sun form a straight line

  2. When Earth, Moon and Sun form a Cross line

  3. When Earth, Moon form a straight line

  4. None
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Solar eclipse is the event where the light form the Sun is blocked by the Moon, when Moon passes between the Sun and the Earth and all three forms a straight line.