Comets

Q. What are comets

Q.

What is a comet? Name the comet which was last seen in 1986 after a period of 76 years.

Q.

What happens to the tail of a comet when it moves far away from the sun ?

Q. The bright star-like object with a long tail approaching the Sun in a highly elliptical orbit is called:

1. a comet
2. a star
3. an asteroid
4. a meteor

Q.

Which comet can be seen every 76 years ?

Q.

When does a comet become visible to us?

Q.

Halley's comet is seen after how many years?

1. 74 years

2. 75 years

3. 76 years

4. 77 years

Q.

Why does the tail of a comet always point away from the sun?

Q. Which of the following is composed of tails made of frozen dust and gas?

1. Comet
2. Meteoroid
3. Asteroid
4. Moon

Q.

Name the member of the Solar System which appears in the sky like a bright ball of light with a long, glowing tail.

Q. What are Comets ?

Q.

Why do tails of comets face backwards to the sun?

Q. Fig. shows comets without their tail. Show the tails of the comets at position A, B, and C. In which position will the tail be longest?

Q. Which of the following statements is/are true?
Statement I: The length of tail of comet grows in size as it approaches the Sun.
Statement II: The tail of comet is always directed towards the Sun.

1. Both Statement I and Statement II
2. Only Statement II
3. None of the above
4. Only Statement I

Q.

What is the period of Halley’s comet?

1. 25 years

2. 75 years

3. 76 years

4. 77 years

Q.

Where do comets come from?

Q.

A comet that completes its one orbit in 76 years is:

1. Shoemaker comet

2. Halleys comet

3. Both A and B

4. none of these

Q. Which among the following is a comet?

1. Deimos
2. Halley
3. Phobos
4. Leo

Q.

Where does the tail of a comet appear in the solar system? Explain why?

Q. The tail of a comet is always directed towards the Sun.

1. True
2. False

Q.

The tail of the comet is formed near the orbit of Mars because:

1. the head moves slower than the nucleus.

2. the comet accelerates as it approaches the sun.

3. solar radiations exert pressure on the head so as to form the tail.

4. none of the above.

Q.

The size of a _______ increases as it moves ________ the Sun.

Q.

Question 20

Fig. shows comets without their tail. Show the tails of the comets at position A, B, and C. In which position will the tail be longest?

Q. Halley Comet was last seen in_____.

1. 2000
2. 1987
3. 1986
4. 1996

Q. Halley was seen in 1986. When it is likely to be seen next?

1. 2090
2. 2037
3. 2062
4. 2081

Q. Fill in the blank with a suitable option:
In its context, the word "portend" (line 57381) means __________________________.

1. predict, and alludes to the superstition that the motion of glowworms could be interpreted to foretell future events
2. forecast, and alludes to the fact that the behavior of insects can be used to predict the next day's weather
3. weigh, and makes clear that glowworms are oblivious to the dramatic upheavals of human life
4. predict, and alludes to the superstition that comets, meteors, and other natural phenomena were omens of evil
5. imitate, and suggests that glowworms mimic the cyclical flight of comets

Q.

Imagine, a comet is seen passing Uranus. The length of its tail was measured to be 3 km. What can be the possible length of its tail when it passes by Earth?

1. 1km

2. 8km

3. 0km

4. 3km

Q.

What is a comet?

1. Small star

2. Planet

3. Small object that goes around Sun

4. Ice giant

Q. A star like body with a long tail is called:

1. Meteorite
2. Pluton
3. Meteor
4. Comet

Q.

The bright star-like object with a long tail approaching the Sun in a highly elliptical orbit is called _______.

1. a comet

2. a star

3. an asteroid

4. a meteor