World Geography Flashcards by dev prashant

Who first demonstrated the existence of Galaxies?

Edwin Hubble in 1924.

How well did you know this?

Not at all

Perfectly

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

Ptolemy in 140 AD

How well did you know this?

Not at all

Perfectly

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

Copernicus in 1543

How well did you know this?

Not at all

Perfectly

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

Kepler

How well did you know this?

Not at all

Perfectly

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

Hershel, in 1805

How well did you know this?

Not at all

Perfectly

What is our Galaxy name?

Milky way Galaxy (or the Akash Ganga)

How well did you know this?

Not at all

Perfectly

Shape of the Galaxy

Spiral

How well did you know this?

Not at all

Perfectly

Nearest Galaxy to us

Andromeda

How well did you know this?

Not at all

Perfectly

Define Light year?

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

How well did you know this?

Not at all

Perfectly

Define Astronomical Unit?

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

How well did you know this?

Not at all

Perfectly

A star’s color indicates?

The temperature of its surface.

How well did you know this?

Not at all

Perfectly

What color denotes maximum temperature of a star?

Blue. Followed by yellow, red etc.,

How well did you know this?

Not at all

Perfectly

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

White dwarf.

How well did you know this?

Not at all

Perfectly

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

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

How well did you know this?

Not at all

Perfectly

Brightest star outside our Solar System?

Sirius, also called Dog Star.

How well did you know this?

Not at all

Perfectly

Closest star of Solar System is

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)

How well did you know this?

Not at all

Perfectly

Weight of the sun?

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

How well did you know this?

Not at all

Perfectly

Average distance of Sun from Earth?

14,95,98,900 km

How well did you know this?

Not at all

Perfectly

Diameter of Sun

13,91,980 km

How well did you know this?

Not at all

Perfectly

Temperature of the Core of the Sun

1,50,00,000 degree Kelvin

How well did you know this?

Not at all

Perfectly

Chemical composition of the Sun

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

How well did you know this?

Not at all

Perfectly

Age of the Sun:

4.6 billion years

How well did you know this?

Not at all

Perfectly

Total life of the Sun

10 billion years.

How well did you know this?

Not at all

Perfectly

Time taken by sunlight to reach earth?

8 minutes and 16.6 seconds

How well did you know this?

Not at all

Perfectly

Speed of light (in vacuum)

3,00,000 kilometers per second

Revolution of Mercury

88 days (fastest revolution in solar system)

What is known as Morning Star or Evening Star?

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

Brightest planet?

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

Closest planet to earth?

Venus

Hottest planet in Solar system?

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

Only planet to rotate (clockwise) backwards?

Venus.

How many satellites does Mars have and what are they?

2 satellites. Phoebus and Deimos.

Which planet is lord of the heavens?

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

Planet with Fastest rotation time in the Solar system?

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

How many Satellites does Jupiter have?

63. Prominent are Europa, Ganymede & Calisto.

Largest Satellite of Solar System?

Ganymede.

Second largest planet?

Saturn.

Revolution and Rotation time of Saturn?

29 years and 10.3 hrs

Planet with least density

Saturn. (30 times less dense than Earth)

Planet with 3 well defined rings

Saturn

No of satellites for Saturn?

57 (Prominent is Titan.)

Which planet rotates from North to South?

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

No. of rings for Uranus.

It has 9 faint rings.

No. of Satellites for uranus

21. Prominent are Miranda, Ariel etc.,

Revolution and Rotation time of Neptune?

165 years, 15.7 days respectively.

Circumference of the moon

11,000 km

Gravitational pull of the moon

1/6th of the Earth.

Average distance of the moon from earth

3,84,365 km

Diameter of the moon

3,476 km

Ratio of diameter of the moon to that of the earth

1 : 3.7

Rotation speed of the moon

27 days, 7 hours, 43 minutes and 11.47 seconds

Revolution speed of the moon

27 days, 7 hours, 43 minutes and 11.47 seconds

Time taken by moon light to reach earth

1.3 seconds

Percent of surface visible from earth

59%

First man to reach moon

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

Landing spot of Neil Armstrong on the moon is called as

Sea of Tranquility

Biggest Planet

Jupiter

Smallest Planet

Mercury

Farthest planet from Sun

Neptune

Nearest planet to Sun

Mercury

Nearest planet to Earth

Venus

Brightest Planet

Venus

Hottest Planet

Venus

Coldest Planet

Neptune

Red planet

Mars

Biggest Satellite

Ganymede

Smallest Satellite

Deimos

Planet with maximum satellites

Jupiter

Lord of the Heavens

Jupiter

Blue Planet

Earth

Morning Star / Evening Star

Venus

Earth's twin

Venus

Planet with a Red Spot

Jupiter

Brightest star outside of Solar system

Sirius (Dog Star)

Closest Star of Solar System

Proxima Centauri

Fastest rotation in Solar System

Jupiter

Slowest rotation is Solar System

Venus

Fastest revolution in Solar System

Mercury

Slowest revolution in Solar System

Neptune

Brightest Star after Sun

Sirius

Green Planet

Neptune

Greatest Diurnal Temperature

Mercury

Earth is also called as

Blue Planet

Circumference of the earth

40,232 km.

Area

510 million sq.km

Average Distance from sun:

149 million kilometers

What is Perihelion?

Nearest position of earth to sun.

Earth reaches its perihelion on

January 3rd

Distance of earth's perihelion

147 million kilometers

Distance of earth's aphelion

152 million kilometers

What is Aphelion

Farthest position of earth from sun.

The earth reaches its aphelion on

July 4

Shape of earth is

Oblate Spheroid or Oblate ellipsoid

Types of Earth movements:

Rotation (Daily movement) and Revolution (Annual movement)

Earth spins on its imaginary axis from

west to east

Rotation time of earth

23 hours 56 minutes and 40.91 seconds

Rotational velocity at equator

1667 km/hr

Rotational velocity at poles

zero

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

15 degrees

The longest day in Northern Hemisphere is

June 21

The shortest day in Northern Hemisphere is

Dec 22

Earth's average orbital velocity is

29.79 km/s

Revolution time of earth

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

What is an Equinox?

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

What is a Solstice?

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

Sun shines directly over what during an Equinox?

Equator

Sun shines directly over what during a Solstice?

Tropics (Cancer or Capricorn)

When is the Spring season in the Northern Hemisphere?

March 21 (Vernal Equinox)

When is the Summer season in the Northern Hemisphere

June 21 (Summer Solstice)

When is the Autumn season in the Northern Hemisphere

Sep 23 (Autumnal Equinox)

When is the Winter season in the Northern Hemisphere

Dec 22 (Winter Solstice)

World Geography Flashcards

Geography of the world.