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Gsa Desk > Physical Sciences > Flashcards

Physical Sciences Flashcards

1
Q

Origin of universe. G

A

Big bang theory.
Small drop

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2
Q

Future of universe

A

Steady state theory
Expanding universe theory
Circular University theory

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3
Q

Steady theory

A

Universe has existed and will be exist forever
Accepted till 17 th century

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4
Q

Expanding universe theory

A

Universe is expanding and will expand until all the helium and hydrogen is consumed.

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5
Q

Circular Universe theory

A

Universe is expanding but a time will come when it contracting back till all the energy will form a ball again.

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6
Q

Galaxy

A

Huge collection of star held together by gravity. Total 125 billion glaxies . The centre part of galaxy is nucleus.

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7
Q

Classification of galaxies

A

Elliptical galaxies
Spiral glaxies
Irregular galaxy
Milky galaxy.

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8
Q

Elliptical galaxies

A

Globular shape with a bright nucleus
Contain a population of old stars little dust and gas.

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9
Q

Elliptical galaxies

A

Globular shape with a bright nucleus
Contain a population of old stars little dust and gas.

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10
Q

Spiral glaxies

A

Contain news bright stars with some old stars
Held together with dust, gas and molecular stars.

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11
Q

Irregular galaxy

A

Large amount of gas, dust and young stars but no regular arrangement.

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12
Q

Cluster and superclusters glaxies

A

Arrange in clusters Milky glaxay is part of it.

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13
Q

Cluster and superclusters glaxies

A

Arrange in clusters Milky glaxay is part of it.

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14
Q

Milky glaxay

A

Large spiral galaxy. Consist of new stars measuring about 10000 light year across.

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15
Q

Solar system

A

Planets , satellites, aseetroids, comets, dawraft planets.

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16
Q

Sun

A

Closest Star to earth, contains no solid material,
Formed 5 billion years ago from a cloud of gas and dust

17
Q

Interior of the Sun

A

Core,( nuclear fusion took place here 150 times dense as water) radiation zone. ( Gases moved outward), convection zone ( , (motion of gases carry out enery to upward) photosphere (shinning surface of sun).

18
Q

Earth

A

Structure
Crust , mantle, Outer core, Inner core.

19
Q

Revolution of earth

A

Revolves around the sun competes one revolution in 365.25 days revolves in anti clock direction .
Revolution causes season change.

20
Q

Rotation of around its on axis

A

Rotates in its on axis from West to East . Causes variation of days and nights.

21
Q

Solar eclipse

A

When moon comes between sun and earth

22
Q

Types of solar eclipse

A

Partial
Full solar eclipse: full shodaw of moon falls on earth.
Darker zone is called Umbra
Lighter zone is called penumbra.

23
Q

Lunar eclipse

A

When earth comes between the moon and sun

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