Question

200
Basic Science for Class 8
uued
Quiz 2
1. How does carbon dioxide extinguish a fire?
a peuoleum retinery, the component of crude oil that has the 118
condenses at the highest/lowest part of the fractionating column.
3. What makes gaseous fuels better than solid and liquid fuels?
4. The gravitational force between two bodies depends on the masses of the bou
5. The SI unit of pressure is .....
vuoness of a sound depends on the frequency/amplitude of the vibrations that produce it.
7. What are the three bones in the middle ear called?
a charged body is connected to an uncharged body by a nonconductor, charge will flow from
the former to the latter until the charge on the two bodies is equal-true or talser
9. When a charged body is brought into contact with the metal disc of a charged electroscope, the
leaves of the electroscope diverge more. What does this show?
10. When a charged body is brought close to an uncharged body, charge is induced on the second
body. Does the second body remain charged if the first body is moved away?
11. Only atoms form ions by losing or gaining electrons, radicals do not-true or false?
12. Do molten ionic compounds conduct electricity?
13. Which nerve transmits the images formed by the eyes to the brain?
14. How can one get an image that is not laterally inverted by using plane mirrors?
15. Which part of the eye helps in accommodation?
Chapter 13: Our Universe​

Answer 1

Answer:

1. A fire burns because of presence of Oxygen, heat and fuel. The carbon dioxide extinguish the fire because the carbon dioxide decreases the level of Oxygen.
2. Not written question
3. Gaseous fuels are better because the gas cannot be touched and hence give space to burn a fire.
4. Don't know sorry .