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Elementary ideas of astronomy - class-VI

Basic concepts of astronomy including eclipses, satellites, moon, stars, and comets

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Study of internal structure of earth is known is

  1. Mechanics
  2. Nuclear physics
  3. Atomic physics
  4. Geophysics
Question 2 Multiple Choice (Single Answer)

A satellite of mass $m$ is revolving around the earth at height $R$ (radius of the earth) from the earth's surface. Its potential energy will be :

  1. $mgR$
  2. $0.67 mgR$
  3. $-\dfrac{mgR}{2}$
  4. $0.33mgR$
Question 3 Multiple Choice (Single Answer)

what is mass of the moon?

  1. $6 \times {10^{24}}$ kg
  2. $7.4 \times {10^{22}}$ kg
  3. $6 \times {10^{22}}$ kg
  4. $7.4 \times {10^{24}}$ kg
Question 4 Multiple Choice (Single Answer)

Lunar eclipse occurs when earth comes in between sun and the moon. Solar eclipse occurs when moon comes in between sun and earth. This suggests that:

  1. Both eclipses occur on a new moon day
  2. Solar eclipse occurs on a new moon day
  3. Lunar eclipse occurs on a new moon day
  4. Both eclipses occur on a full moon day
Question 5 Multiple Choice (Single Answer)

Lunar eclipse occurs when the

  1. Sun comes between the Earth and the Moon.
  2. Moon comes between the Earth and the Sun.
  3. Earth comes between the Moon and the Sun.
  4. the Earth and Moon collide with each other.
Question 6 Multiple Choice (Single Answer)

The partial or complete hiding of one heavenly body by shadow of another is called

  1. Ellipse
  2. Eclipse
  3. Asteriod
  4. None of the above
Question 7 Multiple Choice (Single Answer)

Types of eclipses:

  1. only solar
  2. only lunar
  3. solar and lunar
  4. neither solar nor lunar
Question 8 Multiple Choice (Single Answer)

When Earth comes in between Sun and Moon and casts its shadow on Moon. The ______ eclipse will occur.

  1. solar
  2. lunar
  3. either A or B
  4. none of the above
Question 9 Multiple Choice (Single Answer)

Eclipse occurs when the Earth, Sun and Moon form:

  1. an isosceles triangle
  2. a straight line
  3. any random position
  4. a right angled triangle
Question 10 Multiple Choice (Single Answer)

When the Moon comes in between the Sun and Earth in a straight line, then ________ eclipse will occur.

  1. solar
  2. lunar
  3. either A or B
  4. none of the above
Question 11 Multiple Choice (Single Answer)

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
Question 12 Multiple Choice (Single Answer)

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
Question 13 Multiple Choice (Single Answer)

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
Question 14 Multiple Choice (Single Answer)

The Halley's comet appears after every

  1. $72$ years
  2. $74$ years
  3. $75$ years
  4. $78$ years
Question 15 Multiple Choice (Single Answer)

Which is the brightest star visible from earth?

  1. Sirius
  2. Antares
  3. Vega
  4. Rigel
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