Science Class 6th

581. There are about ______ asteroids.

A. 200000

B. 100000

C. 500000

D. 20000

582. Some asteroids have diameter about Km.

A. 2000

B. 3000

C. 1000

583. The following asteroids can be seen from earth without Telescope.

A. Ceres

B. Vesta

C. Both ‘a’ and ‘b’

D. None of these

584. The largest ever asteroid discovered Ceres, has a diameter about _____ km.

A. 933

B. 980

C. 1000

D. 500

585. Most asteroids complete one orbit around the sun in about _______ earth years

A. 6

B. 5

C. 9

D. 10

586. Smaller, icy celestial bodies revolving around the sun are called?

A. Asteroids

B. Comets

C. Stars

D. None of these

587. When a Comet approach sun, some of ice turn into?

A. Ice

B. Water

C. Gas

D. None

588. Bright ball with long shiny tail is created by?

A. Comets

B. Asteroids

C. None of these

589. A comet has the following parts

A. Head

B. Comma

C. Tail

D. All of these

590. The head is formed from ?

A. Ice particles

B. Gas

C. Both ‘a’ and ‘b’

D. None of these

591. On reaching near Sun, head of Comet, releases gases forming a large circular cloud called

A. Coma

B. Head

C. Tail

D. None

Halley’s is name of?

A. Comet

B. Asteroid

C. None

593. Halley’s Comet can be seen after every _______ years. .

A. 70

B. 76

C. 80

D. 90

594. Halley’s Comet appeared last time in?

A. 1986

B. 1990

C. 2000

D. 1960

595. Halley’s Comet next appearance is expected in?

A. 2060

B. 2030

C. 2062

D. 2090

596. People saw Halley’s Comet in what shape?

A. Long haired star

B. Blade of Sword

C. Dragon with Multiple tails

D. All of these

597. Small solid body made of rocks and iron is called?

A. Comet

B. Asteroid

C. Meteor

D. None of these

598. When ______ enters earth’s atmosphere, it burns with light making visible track

A. Meteor

B. Asteroid

C. Comet

D. None of these

599. Most Meteor entering earth’s atmosphere burn up about _____ km.

A. 500-600

B. 50-100

C. 800

D. 900

600. ______ are known as fireballs, having luminous head and tail and occurs singly.

A. Bolides

B. Brilliant meteors

C. Meteors

D. None of these