Tag: moon and it's phases

Questions Related to moon and it's phases

Phases of the moon occur because:

evs sun and planets phases of moon moon and it's phases moon

  1. We can see only that part of the moon which reflects light towards us

  2. Our distance from the moon keeps changing

  3. The shadow of the Earth covers only a part of moon's surface

  4. The thickness of the moon's atmosphere is not constant

Show answer
Correct Option: A
Explanation:

Phases of the moon occur because we can see only that part of the moon which reflects light towards us.
The changing shape of the bright part of the Moon that we see is called its phase. The moon is illuminated because it reflects the light from the sun. The part of the moon facing the sun is lit up. The part facing away from the sun is in darkness.

If new moon day is day $1$, then what is the day of the gibbous moon?

evs sun and planets phases of moon moon and it's phases moon

  1. $14$

  2. $3$

  3. $7$

  4. $10$

Show answer
Correct Option: D
Explanation:

If new moon day is day $1$, then-

Day $3$ - Crescent moon
Day $7$ - Half moon
Day $10$ - Gibbous moon (or waxing)
Day $14$ - Full moon

Which two moons are also called half moons?

evs sun and planets phases of moon moon and it's phases moon

  1. First Quarter & Third Quarter

  2. Waning Crescent & Waxing Crescent

  3. Waxing Crescent & First Quarter

  4. Full & New Moon

Show answer
Correct Option: A
Explanation:

Half moon are the phase of moon when the moon is half lit so only half visible.

First Quarter and third Quarter.

Moon's phase cycle repeats on an average of ______ days.

evs sun and planets phases of moon moon and it's phases moon

  1. $365$

  2. $120$

  3. $15$

  4. $30$

Show answer
Correct Option: D
Explanation:

There are $12$ phases of moon which repeats after $30$ days. New cycle start after $30$ days

Which word also means 'growing'?

evs sun and planets phases of moon moon and it's phases moon

  1. Waxing

  2. Waning

  3. Gibbous

  4. Crescent

Show answer
Correct Option: A
Explanation:

New Moon is a phase of the moon cycle in which it is not visible at all.

On the next day, a small part of the moon is visible. Thereafter, the moon appears to be expanding day by day.
On a special day, the moon appears completely full and visible. This is known as Full Moon. 
This apparent growing of the moon is also called a Waxing of the moon. 

Which moon is also referred to as "Dark Moon"?

evs sun and planets phases of moon moon and it's phases moon

  1. Full Moon

  2. Waning Crescent

  3. New Moon

  4. Waning Gibbous

Show answer
Correct Option: C
Explanation:

The moon is visible on earth because the light from the sun falls on it, gets reflected from it and enters the eyes of the people who are watching it on earth.  The moon appears crescent, half, full, not at all, etc, depending on its position with respect to the sun and the earth.

The light falling on any part of the moon gets reflected. However the light reflected only from some part of the moon reaches the earth. Only that part is visible to the people on the earth.
On the new moon day, the moon is on the same side of the earth as that of the sun with respect to earth. No light from the moon reaches the earth and it becomes invisible. Its apparent colour is black, i.e. same of that as that of the night sky.
Hence it is also called as dark moon.

For practical understanding, you can perform the experiment given below
Take a torch, switch it on and place it on a table.
Stand in front of the source of light of the torch.
Take a small ball and hold it at a height same as that of the torch and facing the torch.
You will notice that the ball appears dark.
Now if you change the position of the ball, keeping the height same, you will notice that only some part of the ball appears illuminated.
If you place it diametrically opposite to the torch, but at height slghtly higher than your head, the entire ball gets illuminated.

The phases of the moon are due to situations similar to this experiment.  

Which moon is after the waxing crescent?

evs sun and planets phases of moon moon and it's phases moon

  1. Third Quater

  2. First Quarter

  3. Waxing Gibbous

  4. New moon

Show answer
Correct Option: B
Explanation:

Waxing crescent moon comes after New moon and lasts until half of moon surface is illuminated at first quarter moon.

After the period of how many days half moon can be seen?

evs sun and planets phases of moon moon and it's phases moon

  1. $7$ or $22$ days

  2. $1$ or $30$ days

  3. $15$ days

  4. $10$ or $17$ days

Show answer
Correct Option: A
Explanation:

Half moon are the phase when only half surface of moon is visible. It exist at about $7$ days and $22$ days.

At $15$ day the full moon is seen.

Which of the following is a consequence of the fact that the rotation and revolution periods of the moon are the same?

evs sun and planets phases of moon moon and it's phases moon

  1. The moon keeps the same face turned toward the earth

  2. The moon can never be seen from one hemisphere of the earth

  3. All lunar phases can be seen from the earth

  4. There are about 12 months per year

Show answer
Correct Option: A
Explanation:

The rotation or revolution period is the time taken by an object to complete one rotation or revolution respectively.

The answer to this question can be explained only with the help of the following experiment.
Stand straight and hold a ball in front of your face.

Tell your friend to stand just like you, facing your front.
Keeping the ball in front of your face, turn your entire body by 90 degrees.
But your friend should not make any movements.
You will notice that, here, the ball has traveled a path of a quarter circle.
You will also notice that the part of the ball which was in the front of your friend is now on his/her right side.
This shows that the ball has turned around itself by a quarter of one full rotation.
You will notice similar phenomena if you turn by 180 degrees, 270 and 360.
This show that in fixed intervals of time, the angular displacement of rotation and that of revolution of the are equal.
The motion of the moon around the earth is same as that of the ball in the above experiment.
Hence the rotation and revolution periods of the moon are the same and as a result the moon keeps the same face turned towards the earth.

What kind of eclipse do we see when the moon is entirely within the Earth's umbral shadow?

evs sun and planets phases of moon moon and it's phases moon

  1. Partial lunar

  2. Total solar

  3. Total lunar

  4. Partial solar

Show answer
Correct Option: C
Explanation:

Solar Eclipse are of $4$ types.

$\longrightarrow $ Total Eclipse [occurs only at umbral shadow
$\longrightarrow $ Partial Eclipse
$\longrightarrow $ Annular Eclipse
$\longrightarrow $ Hybrid Eclipse
Since moon is in shadow its going to be lunar eclipse.
Total lunar is the answer.