| 1 |
Compustion is a. |
- A. Physical Change
- B. Chemical change
- C. Thermal change
- D. None of these
|
| 2 |
Zince oxide is ............... solid substances. |
- A. Red
- B. White
- C. Yellow
- D. Blue
|
| 3 |
Sajeet the one that is different from the otehrs. |
- A. Solubility
- B. Conductance
- C. Oxidation
- D. Coiling of a substance
|
| 4 |
During combustion, a substance reacts with |
- A. Hydrogen
- B. Water
- C. Oxygen
- D. Carbon di oxide
|
| 5 |
Formation of steam from water is example of. |
- A. Chemical change
- B. Physical Change
- C. Both of these
- D. None of these
|
| 6 |
What are teh products when electric current is passed through water. |
- A. Only steam
- B. Hydrogen and steam
- C. Hydrogen and oxygen
- D. Oxygen and steam
|
| 7 |
The temperature at which a liquid's vapour pressure is equal to the external pressure surrounding the liquid is. |
- A. Melting point
- B. Boiling point
- C. Freezing point
- D. Highest temperature.
|
| 8 |
A piece of iron is kept in open air for 5 days. A film of corrosion formed over it is. |
- A. Iron oxide
- B. Iron sulphide
- C. Iron Chloride
- D. Iron Hydride
|
| 9 |
On heating sugar changes into |
- A. Carbon
- B. Water
- C. Both carbon and water
- D. Heat
|
| 10 |
A physical change occurs when. |
- A. Iron rusts
- B. Solution of common salt is heated
- C. A piece of wood burns
- D. Sygar us geated strongly
|
