ICSE Class 6 Chemistry - Introduction to Chemistry - Test 3 (Advanced)
1. A gas kept in a large container spreads throughout the container. Which property of gas does this show?
A. Gas has fixed shape
B. Gas fills available space
C. Gas cannot move
2. A stone sinks in water, but a cork floats. This difference is mainly due to:
A. Colour
B. Smell
C. Density
3. Which observation best proves that air is matter?
A. A football becomes full when air is pumped into it
B. Air has no colour
C. Air cannot be seen easily
4. If the same amount of juice is poured into a cup and then into a bowl, what changes?
A. Its volume changes
B. Its shape changes
C. It becomes a solid
5. Which statement correctly describes a compound?
A. It is always a mixture of gases
B. Its parts can always be seen separately
C. It has elements chemically combined
6. Why can sand and salt be called a mixture?
A. They are physically mixed
B. They form a new substance
C. They become an element
7. A mixture contains salt and sand. Which property helps to separate salt from sand using water?
A. Sand is sweet
B. Salt dissolves in water
C. Salt is magnetic
8. A cup of tea with sugar is an example of:
A. An element
B. A pure metal
C. A mixture
9. Which substance is classified as an element?
A. Gold
B. Lemon water
C. Muddy water
10. Why is the atmosphere important for life on Earth?
A. It makes all objects solid
B. It provides air for breathing
C. It removes all water from Earth
11. A flame becomes weak when air supply is reduced. This happens because:
A. Nitrogen changes into fire
B. Air becomes solid
C. Oxygen supply becomes less
12. Why does carbon dioxide help in putting out fire?
A. It does not support burning
B. It burns faster than oxygen
C. It turns fire into water
13. Which apparatus should be chosen to measure a fixed volume of water more accurately?
A. Beaker
B. Measuring cylinder
C. Test tube holder
14. Why is a tripod stand used during heating in the laboratory?
A. To taste chemicals
B. To clean test tubes
C. To support apparatus above a flame
15. Why should chemicals not be touched with bare hands?
A. They may be harmful
B. They always become food
C. They lose their colour only
16. What is the safest action if a teacher asks you to check the smell of a chemical?
A. Put your nose inside the bottle
B. Gently waft the smell towards your nose
C. Drink a little chemical first
17. A piece of paper is burnt and ash is formed. What does this show?
A. Only shape changed
B. No change happened
C. A chemical change happened
18. Wax melts when heated. Why is this a physical change?
A. Only the state changes
B. A new metal is formed
C. Wax changes into oxygen
19. Why is burning a matchstick different from breaking a matchstick?
A. Breaking forms many new gases
B. Burning forms new substances
C. Burning is only a change in size
20. A glass has a lot of water and only a little sugar dissolved in it. The solution is:
A. Very concentrated
B. Pure element
C. Dilute