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Geography > World Geography > Flashcards

World Geography Flashcards

Geography of the world.

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1
Q

Who first demonstrated the existence of Galaxies?

A

Edwin Hubble in 1924.

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2
Q

Who propounded the theory that Earth was the center of the Universe?

A

Ptolemy in 140 AD

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3
Q

Who said the Sun is in the center of the Universe?

A

Copernicus in 1543

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4
Q

Who said that the Sun was the center of Solar System and not Universe?

A

Kepler

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5
Q

Who said Solar system was part of the much larger system of Stars called ‘Galaxy’?

A

Hershel, in 1805

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6
Q

What is our Galaxy name?

A

Milky way Galaxy (or the Akash Ganga)

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7
Q

Shape of the Galaxy

A

Spiral

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8
Q

Nearest Galaxy to us

A

Andromeda

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9
Q

Define Light year?

A

It is the distance covered by light in one year in vacuum at a speed of 3 x 10^5 km/sec.

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10
Q

Define Astronomical Unit?

A

It is the mean distance between Sun and earth. One light year is equal to 60,000 AU.

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11
Q

A star’s color indicates?

A

The temperature of its surface.

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12
Q

What color denotes maximum temperature of a star?

A

Blue. Followed by yellow, red etc.,

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13
Q

If a star is of sun’s size, it becomes a

A

White dwarf.

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14
Q

If a star is bigger than the sun but not more than twice as big, it will turn into a?

A

Neutron Star or Pulsar. They are formed due to novae or super novae explosion.

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15
Q

Brightest star outside our Solar System?

A

Sirius, also called Dog Star.

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16
Q

Closest star of Solar System is

A 
Proxima Centauri (4.2 light years away) followed by 
Alpha Centauri (4.3 light years away) and 
Barnard's Star (5.9 light years away)
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17
Q

Weight of the sun?

A

2 x 10^27 tons. 109 times bigger than earth.

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18
Q

Average distance of Sun from Earth?

A

14,95,98,900 km

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19
Q

Diameter of Sun

A

13,91,980 km

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20
Q

Temperature of the Core of the Sun

A

1,50,00,000 degree Kelvin

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21
Q

Chemical composition of the Sun

A

Hydrogen: 71%, Helium: 26.5%, Other gases: 2.5%

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22
Q

Age of the Sun:

A

4.6 billion years

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23
Q

Total life of the Sun

A

10 billion years.

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24
Q

Time taken by sunlight to reach earth?

A

8 minutes and 16.6 seconds

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25
Q

Speed of light (in vacuum)

A

3,00,000 kilometers per second

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26
Q

Revolution of Mercury

A

88 days (fastest revolution in solar system)

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27
Q

What is known as Morning Star or Evening Star?

A

Venus. It is seen in the east in the morning and in the west in the evening. Not possible to see in the night

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28
Q

Brightest planet?

A

Venus. (Due to 0.65% Albedo, the reflecting power)

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29
Q

Closest planet to earth?

A

Venus

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30
Q

Hottest planet in Solar system?

A

Venus due to greenhouse effect as its atmosphere contains 90-95% Carbon dioxide.

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31
Q

Only planet to rotate (clockwise) backwards?

A

Venus.

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32
Q

How many satellites does Mars have and what are they?

A

2 satellites. Phoebus and Deimos.

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33
Q

Which planet is lord of the heavens?

A

Jupiter. Because it’s the largest of all the planets (71% of the total mass of all planets.)

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34
Q

Planet with Fastest rotation time in the Solar system?

A

Jupiter (9.8 hrs) Means a day has only 9.8 hrs there.

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35
Q

How many Satellites does Jupiter have?

A
  1. Prominent are Europa, Ganymede & Calisto.
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36
Q

Largest Satellite of Solar System?

A

Ganymede.

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37
Q

Second largest planet?

A

Saturn.

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38
Q

Revolution and Rotation time of Saturn?

A

29 years and 10.3 hrs

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39
Q

Planet with least density

A

Saturn. (30 times less dense than Earth)

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40
Q

Planet with 3 well defined rings

A

Saturn

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41
Q

No of satellites for Saturn?

A

57 (Prominent is Titan.)

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42
Q

Which planet rotates from North to South?

A

Uranus as it’s inclined at an angle of 98 deg to its orbit.

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43
Q

No. of rings for Uranus.

A

It has 9 faint rings.

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44
Q

No. of Satellites for uranus

A
  1. Prominent are Miranda, Ariel etc.,
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45
Q

Revolution and Rotation time of Neptune?

A

165 years, 15.7 days respectively.

46
Q

Circumference of the moon

A

11,000 km

47
Q

Gravitational pull of the moon

A

1/6th of the Earth.

48
Q

Average distance of the moon from earth

A

3,84,365 km

49
Q

Diameter of the moon

A

3,476 km

50
Q

Ratio of diameter of the moon to that of the earth

A

1 : 3.7

51
Q

Rotation speed of the moon

A

27 days, 7 hours, 43 minutes and 11.47 seconds

52
Q

Revolution speed of the moon

A

27 days, 7 hours, 43 minutes and 11.47 seconds

53
Q

Time taken by moon light to reach earth

A

1.3 seconds

54
Q

Percent of surface visible from earth

A

59%

55
Q

First man to reach moon

A

Neil Armstrong and Edwin Aldrin on Apollo-XI (1969)

56
Q

Landing spot of Neil Armstrong on the moon is called as

A

Sea of Tranquility

57
Q

Biggest Planet

A

Jupiter

58
Q

Smallest Planet

A

Mercury

59
Q

Farthest planet from Sun

A

Neptune

60
Q

Nearest planet to Sun

A

Mercury

61
Q

Nearest planet to Earth

A

Venus

62
Q

Brightest Planet

A

Venus

63
Q

Hottest Planet

A

Venus

64
Q

Coldest Planet

A

Neptune

65
Q

Red planet

A

Mars

66
Q

Biggest Satellite

A

Ganymede

67
Q

Smallest Satellite

A

Deimos

68
Q

Planet with maximum satellites

A

Jupiter

69
Q

Lord of the Heavens

A

Jupiter

70
Q

Blue Planet

A

Earth

71
Q

Morning Star / Evening Star

A

Venus

72
Q

Earth’s twin

A

Venus

73
Q

Planet with a Red Spot

A

Jupiter

74
Q

Brightest star outside of Solar system

A

Sirius (Dog Star)

75
Q

Closest Star of Solar System

A

Proxima Centauri

76
Q

Fastest rotation in Solar System

A

Jupiter

77
Q

Slowest rotation is Solar System

A

Venus

78
Q

Fastest revolution in Solar System

A

Mercury

79
Q

Slowest revolution in Solar System

A

Neptune

80
Q

Brightest Star after Sun

A

Sirius

81
Q

Green Planet

A

Neptune

82
Q

Greatest Diurnal Temperature

A

Mercury

83
Q

Earth is also called as

A

Blue Planet

84
Q

Circumference of the earth

A

40,232 km.

85
Q

Area

A

510 million sq.km

86
Q

Average Distance from sun:

A

149 million kilometers

87
Q

What is Perihelion?

A

Nearest position of earth to sun.

88
Q

Earth reaches its perihelion on

A

January 3rd

89
Q

Distance of earth’s perihelion

A

147 million kilometers

90
Q

Distance of earth’s aphelion

A

152 million kilometers

91
Q

What is Aphelion

A

Farthest position of earth from sun.

92
Q

The earth reaches its aphelion on

A

July 4

93
Q

Shape of earth is

A

Oblate Spheroid or Oblate ellipsoid

94
Q

Types of Earth movements:

A

Rotation (Daily movement) and Revolution (Annual movement)

95
Q

Earth spins on its imaginary axis from

A

west to east

96
Q

Rotation time of earth

A

23 hours 56 minutes and 40.91 seconds

97
Q

Rotational velocity at equator

A

1667 km/hr

98
Q

Rotational velocity at poles

A

zero

99
Q

There’s a difference of 1 hour between two meridians which are how many degrees apart?

A

15 degrees

100
Q

The longest day in Northern Hemisphere is

A

June 21

101
Q

The shortest day in Northern Hemisphere is

A

Dec 22

102
Q

Earth’s average orbital velocity is

A

29.79 km/s

103
Q

Revolution time of earth

A

365 days, 5 hours, 48 minutes and 45.51 seconds.

104
Q

What is an Equinox?

A

These are the days when the lengths of days and nights are equal.

105
Q

What is a Solstice?

A

These are the days when the difference between the length of the days and length of the nights is the largest.

106
Q

Sun shines directly over what during an Equinox?

A

Equator

107
Q

Sun shines directly over what during a Solstice?

A

Tropics (Cancer or Capricorn)

108
Q

When is the Spring season in the Northern Hemisphere?

A

March 21 (Vernal Equinox)

109
Q

When is the Summer season in the Northern Hemisphere

A

June 21 (Summer Solstice)

110
Q

When is the Autumn season in the Northern Hemisphere

A

Sep 23 (Autumnal Equinox)

111
Q

When is the Winter season in the Northern Hemisphere

A

Dec 22 (Winter Solstice)

Geography (2 decks)

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