• Elementary ideas of astronomy - class-VI
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Elementary ideas of astronomy - class-VI

Description: elementary ideas of astronomy
Number of Questions: 16
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Tags: physics light and shadow gravitation circular motion and gravitation
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Study of internal structure of earth is known is

physics circular motion and gravitation elementary ideas of astronomy shadow formation and optical medium light and shadow

  1. Mechanics

  2. Nuclear physics

  3. Atomic physics

  4. Geophysics

Show answer
Correct Option: D
Explanation:

Study of internal structure of earth is known is $Geophysics.$

Hence,
option $(D)$ is correct 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 :

physics circular motion and gravitation elementary ideas of astronomy shadow formation and optical medium light and shadow

  1. $mgR$

  2. $0.67 mgR$

  3. $-\dfrac{mgR}{2}$

  4. $0.33mgR$

Show answer
Correct Option: A

what is mass of the moon?

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

  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

Show answer
Correct Option: B
Explanation:

The mass of the moon is $7.4\times 10^{22}kg.$

The correct option is B.

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:

physics light and shadow elementary ideas of astronomy shadow formation and optical medium the solar system nature and sources of light how light travels

  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

Show answer
Correct Option: B
Explanation:

A solar eclipse occurs when the Moon passes between the Sun and

Earth, and the Moon fully or partially blocks the Sun. This

can happen only at new moon, when the Sun and the Moon are in

conjunction as seen from Earth in an alignment.
A lunar eclipse occurs when the Moon passes

directly behind the Earth into its shadow. This can occur only

when the Sun, Earth, and Moon are aligned exactly, or very

closely so, with the Earth in the middle. Hence, a lunar eclipse can only occur the night of a full moon.

Lunar eclipse occurs when the

physics light and shadow elementary ideas of astronomy shadow formation and optical medium the solar system nature and sources of light how light travels

  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.

Show answer
Correct Option: C
Explanation:

The Moon moves around the Earth and the Earth moves around the Sun. During their revolutions, when the Moon, the Earth and the Sun come into a straight line keeping the Earth in between the Moon and the Sun, the lunar eclipse takes place.

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

physics light and shadow elementary ideas of astronomy shadow formation and optical medium the solar system nature and sources of light how light travels

  1. Ellipse

  2. Eclipse

  3. Asteriod

  4. None of the above

Show answer
Correct Option: B
Explanation:

Eclipse is partial or complete hiding of one heavenly body by shadow of another.

Solar eclipse and lunar eclipse are two processes associated with earth, moon and sun.

Types of eclipses:

physics light and shadow elementary ideas of astronomy shadow formation and optical medium the solar system nature and sources of light how light travels

  1. only solar

  2. only lunar

  3. solar and lunar

  4. neither solar nor lunar

Show answer
Correct Option: C
Explanation:

There are 2 types of eclipses:
Solar
Lunar

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

physics light and shadow elementary ideas of astronomy shadow formation and optical medium the solar system nature and sources of light how light travels

  1. solar

  2. lunar

  3. either A or B

  4. none of the above

Show answer
Correct Option: B
Explanation:

During lunar eclipse, Earth comes between Sun and Moon in a straight line. The shadow of the Earth falls on the Moon and the Moon gets eclipsed.

Eclipse occurs when the Earth, Sun and Moon form:

physics light and shadow elementary ideas of astronomy shadow formation and optical medium the solar system nature and sources of light how light travels

  1. an isosceles triangle

  2. a straight line

  3. any random position

  4. a right angled triangle

Show answer
Correct Option: B
Explanation:

Eclipse occurs when Sun, Earth and Moon come in a straight line. The Earth or Moon that comes in between casts a shadow on Moon or Earth and form lunar or solar eclipse respectively.

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

physics light and shadow elementary ideas of astronomy shadow formation and optical medium the solar system nature and sources of light how light travels

  1. solar

  2. lunar

  3. either A or B

  4. none of the above

Show answer
Correct Option: A
Explanation:

During solar eclipse, Moon comes between Sun and the Earth. The Sun is eclipsed where the shadow of the Moon falls on the Earth.

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?

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

  1. III only

  2. II only

  3. I and II only

  4. I, II and III

Show answer
Correct Option: C
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.

Who is known as father of Modern Indian Astronomy?

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

  1. Venkoji Bapu Ketkar

  2. Meghnath Saha

  3. M.K. Vainu Bappu

  4. Dr. S. Chandrashekhar

Show answer
Correct Option: C
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.'

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

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

  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

Show answer
Correct Option: D
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.

The Halley's comet appears after every

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

  1. $72$ years

  2. $74$ years

  3. $75$ years

  4. $78$ years

Show answer
Correct Option: C
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 $1758$.

Which is the brightest star visible from earth?

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

  1. Sirius

  2. Antares

  3. Vega

  4. Rigel

Show answer
Correct Option: A
Explanation:

The brightest strain the shy is Sirius also known as Dog star or more officially Alpha can is Magon's for its position in constellation canis Major.

What is metrology?

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

  1. The study of people's influx to a metropolitan city

  2. The study of earth's atmosphere

  3. The science of measuring

  4. The study of meteors

Show answer
Correct Option: C
Explanation:

Metrology is the scientific study of the atmosphere that focuseson weather processes and forecasting.

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