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Other objects in solar system - class-VII

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The part of a meteor which reaches the earth's surface is called a

  1. comet

  2. meteorite

  3. shooting car

  4. nebulae


Correct Option: B
Explanation:

Meteorite is the part of meteor which reaches the earth's surface.

Halley's comet was first seen by

  1. Galileo

  2. Copernicus

  3. Halley

  4. Newton


Correct Option: C
Explanation:

Halley's comet is named after the scientist Halley who saw it first time.

Identify the true statement(s) for comets:

  1. Those are messengers of disaster

  2. Many comets appear after a fixed time interval

  3. Occurrance of comets is a natural phenomenon

  4. The tail of the comet is always directed towards the sun


Correct Option: B,C
Explanation:

Occurance of comets is a natural phenomenon and there is nothing superstitious about it. Many comets appear after fixed time interval for example, Halley"s comet which appears once in every 76 years.

The bright streaks of light seen occasionally in the sky are ________.
  1. planets

  2. satellites

  3. meteors

  4. constellations


Correct Option: C
Explanation:

Meteors are small objects that sometimes enter the Earth"s atmosphere. However, due to the high speed of the meteor friction is created between its surface and Earth"s atmosphere causing it to heat up. Thus it glows and evaporates quickly and appears for a very short period of time as a bright streak of light.

Comets revolve around the Sun:

  1. in a highly elliptical orbit

  2. along a circular orbit

  3. in an elliptical orbit

  4. varying orbit depending on the comet


Correct Option: A
Explanation:

Comets revolve around the Sun in a highly elliptical orbit such that at one end of the orbit it is very far from the Sun and at the other end it is near to the Sun.

Comet is an object with a _________ head and a _________ tail.
  1. pale, long

  2. bright, long

  3. pale, short

  4. bright, short


Correct Option: B
Explanation:

A comet generally appears as a bright head with a long tail.

Meteorites are useful because:

  1. those can be stored in the museum

  2. those help the scientists in studying the material from which the solar system was formed

  3. those cause destruction

  4. those are only rocks


Correct Option: B
Explanation:

Meteorites are useful mainly because they help the scientists in studying the material from which the solar system was formed.

What is a meteorite?

  1. A meteor that reaches the surface of Earth

  2. Shooting star

  3. A constellation

  4. A comet


Correct Option: A
Explanation:

Some meteors are large enough to reach the Earth's surface before they evaporate completely. Such meteors that reach the surface of Earth are called meteorites.

Identify the wrong statements for asteroids:

  1. Revolve around the Sun

  2. Separate inner and outer planets

  3. Can only be seen through any telescopes

  4. Asteroids are rock-like structures


Correct Option: C
Explanation:

Asteroids are rock-like structures that occupy the huge gap between the orbits of Mars and Jupiter. 

Those, too, revolve around the Sun in a similar orbit. 
Those form a belt like structure known as asteroid belt and the planets before the asteroid belt i.e., Mercury, Venus, Earth and Mars, are called inner planets. The planets that lie beyond the asteroids i.e., Jupiter, Saturn, Uranus and Neptune are called outer planets. 
Since the asteroids are smaller is size, those can only be seen through large and powerful telescopes, not through any telescope.

All meteors reach the surface of the Earth. This statement is

  1. True

  2. False


Correct Option: B
Explanation:

Meteors that are small in size evaporate before they can reach the surface of Earth due to the heat generated because of friction between the meteor's surface and Earth's atmosphere. Only the bigger ones reach the surface of the Earth.

Shooting stars are actually not meteors.

  1. True

  2. False


Correct Option: B
Explanation:

Despite its name, shooting stars are not actually stars. Shooting star is either a piece of a small rock or dust from space that heats up when is enters the Earth's atmosphere. Shooting stars are basically meteors.

Which of the following other than planet is (are) member(s) of solar system?

  1. Asteroids

  2. Constellations

  3. Meteors

  4. Both A and C


Correct Option: D
Explanation:

Both asteroids and meteors are part of solar system.

Which of the following is NOT true for comets ?

  1. Some comets are believed to have originated in a region near the edge of the orbit of the outer planets in our solar system called the "scattered disk" that overlaps a region called the Kulper belt.

  2. Some comets are believed to have originated in the outer-most region associated with our solar system, called the Oort cloud.

  3. The tail of a comet gives the comet its propulsion, like rocket fuel out the back end of a rocket.

  4. The tails of a comet generally point away from the Sun and are made of two major parts - a dusty part (that curves a bit) and an ionic part.

  5. Comets of ten contain significant amount of water.


Correct Option: C
Explanation:

In the outer Solar System, comets remain frozen and are extremely difficult or impossible to detect from Earth due to their small size. As a comet approaches the inner Solar System, solar radiation causes the volatile materials within the comet to vaporize and stream out of the nucleus, carrying dust away with them. The streams of dust and gas thus released form a huge, extremely tenuous atmosphere around the comet called coma, and sun's radiation pressure and solar wind cause the tail to point away from the Sun.

All the facts stated in the options are correct except for option C.
Correct answer is option C.

What is the orbital period of halley's comet?

  1. $66$ years

  2. $76$ years

  3. $86$ years

  4. $96$ years


Correct Option: B
Explanation:

Orbital period of Halley's comet is $76$ years.

Asteroids orbit around the sun in belt_____________.

  1. beyond Uranus

  2. between Jupiter and Saturn

  3. between Jupiter and mars

  4. between Earth and Mars


Correct Option: C

Between which two planets, asteroid belt can be found?

  1. Venus and Earth

  2. Mars and Jupiter

  3. Mars and Earth

  4. Saturn and Venus

  5. None of these


Correct Option: B

Why tail of comets is formed ,when it comes closer to sun ?

  1. Ice presents in the comets gets vapourised

  2. When is comes closer to sun ,vapour converts in to ice

  3. Dust particle in the comets gets heated

  4. Water present in comets gets cooled


Correct Option: A
Explanation:

The tail of comets so formed, When comets come closer to the sun, because the sun's heat vaporizes some of the comets' material, releasing dust particles that were trapped in the ice.

The correct option is A.

Which is the first and biggest asteroid discovered? 

  1. Vesta

  2. Titan

  3. Ceres

  4. Charon


Correct Option: C
Explanation:

The first and largest, Ceres, was discovered Jan. 1, 1801, by the Italian astronomer Father Piazzi (1746–1826).

The tail of a comet always points__________ .

  1. towards the sun

  2. away from the sun

  3. towards north-east

  4. towards south-west


Correct Option: B
Explanation:

The streams of dust and gas thus released from a huge extremely tenous atmosphere around the comet called coma and force exerted on coma by the sun's radiation pressure and solar wind cause an anormous tail form which points away from the sun

Shooting star is another name for

  1. comet

  2. meteor

  3. nubulae

  4. solar flare


Correct Option: B
Explanation:

Ans: Meteor

The largest asteroid known to a man is _________.

  1. Vesta

  2. Ceres

  3. Chiron

  4. Trozan


Correct Option: B

The Hallye's comet was sighted last in 1986. It will be seen again in the year ________.

  1. $2064$

  2. $2060$

  3. $2052$

  4. $2062$


Correct Option: D

The heavenly body which revolves around a planet is called a ______________.

  1. comet

  2. star

  3. satellite

  4. nebulae


Correct Option: C
Explanation:

Ans: Satellite

The age of our solar system is approximately

  1. $4600$ million years

  2. $4.6$ million years

  3. $460$ million years

  4. $460$ billion years


Correct Option: A
Explanation:

Ans 4600 million years

The meteors seldom reach the earth because of :

  1. freezing caused when they pass through the atmosphere

  2. vapourization caused when they pass through the atmosphere

  3. greater force of attraction towards sun

  4. greater force of attraction towards moon


Correct Option: B
Explanation:

Meteors seldom reach earth because of vapourization caused when they pass the atmosphere.

Ans:  vapourization caused when they pass the atmosphere.

Which of the following is NOT true for comets?

  1. Some comets are believed to have originated in a region near the edge of the orbit of the outer planets in our solar system called the "scattered disk" that overlaps a region called the Kuiper belt

  2. Some comets are believed to have originated in the outer-most region associated with our solar system, called the Oort cloud

  3. The tail of a comet gives the comet its propulsion, like rocket fuel out the back end of a rocket

  4. The tails of comets generally point away from the sun and are made of two major parts-a dusty part (that curves a bit) and an ionic part

  5. Comets often contain significant amounts of water


Correct Option: A
Explanation:

In addition to celestial objects like $\textit{Comets}$, we also have  $\textit{Asteroids}$ which are small rocky bodies orbiting the sun and mostly found in the belt (region) between Mars and Jupiter. While there are also other asteroids lying beyond this region whose paths often come in close proximity with orbit of earth. \par Many a times collision between two asteroids, can result in small pieces breaking off from the bodies. These pieces are called $\textit{meteoroids}$. If a meteoroid enters the earth's atmosphere, it vaporizes and turns into a $\textit{meteor}$.

Which part of the solar system is farthest from the sun?

  1. Pluto

  2. The Oort cloud

  3. The asteroid belt

  4. The milky way

  5. The Kuiper belt


Correct Option: B
Explanation:

In solar system, the Oort cloud is the farthest from the sun.

The tail of a comet is directed away from the sun because.

  1. The radiation emitted by the sun exerts a radial pressure on the comet throwing its tail away from the sun

  2. As the comet rotates, the lighter mass of the comet is attracted by some star situated in the direction of its tail

  3. As the comet rotates around the sun, the lighter mass of the comet is pushed away due to the centrifugal force alone

  4. The tail of the comet always exists in the same orientation


Correct Option: A
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