Q.1 Tick the correct option:
1. The reason for a physical change to be named is
a. Change occurs only in physical properties
b. Transfer of energy takes place
c. A reversible change
d. All of the above
2. A change is a chemical change when it is accompanied by
a. Energy change
b. Formation of new substances
c. Change in composition
d. All of the above
3. A change in which substance can be obtained back is called
a. Reversible change
b. Chemical change
c. Irreversible change
d. None
4. Which of the following change is accompied by sound
a. Photosynthesis
b. Burning of wood
c. Spoilage of food
d. Bursting of firecrackers
5. Which of the following statement is correct?
a. Erosion is an undesirable change
b. Ripening of fruit is an undesirable change
c. Formation of curd is an undesirable change
d. Change of seasons is an undesirable change
6. In which of the following situations chemical reaction will not
occur?
a. Common salt exposed to air
b. Coal burnt in air
c. Sodium placed in water
d. Iron placed in air
7. Which processes involve change in state?
a. Evaporation
b. Sublimation
c. Propagation
d. Both a and b
8. Heat absorbed during the reaction is called
a. Endothermic reaction
b. Exothermic reaction
c. Both a and b
d. None of the above
9. The substance that increases the rate of reaction is called?
a. Reactant
b. Product
c. Catalyst
d. Temperature
10. Which of the following can flow?
a. Fluids
b. Only liquids
c. Solids and liquids
d. Solids and gases
Answers
Answer:
Q.1 Tick the correct option:
1. The reason for a physical change to be named is
a. Change occurs only in physical properties
b. Transfer of energy takes place
c. A reversible change
d. All of the above
2. A change is a chemical change when it is accompanied by
a. Energy change
b. Formation of new substances
c. Change in composition
d. All of the above
3. A change in which substance can be obtained back is called
a. Reversible change
b. Chemical change
c. Irreversible change
d. None
4. Which of the following change is accompied by sound
a. Photosynthesis
b. Burning of wood
c. Spoilage of food
d. Bursting of firecrackers
5. Which of the following statement is correct?
a. Erosion is an undesirable change
b. Ripening of fruit is an undesirable change
c. Formation of curd is an undesirable change
d. Change of seasons is an undesirable change
6. In which of the following situations chemical reaction will not
occur?
a. Common salt exposed to air
b. Coal burnt in air
c. Sodium placed in water
d. Iron placed in air
7. Which processes involve change in state?
a. Evaporation
b. Sublimation
c. Propagation
d. Both a and b
8. Heat absorbed during the reaction is called
a. Endothermic reaction
b. Exothermic reaction
c. Both a and b
d. None of the above
9. The substance that increases the rate of reaction is called?
a. Reactant
b. Product
c. Catalyst
d. Temperature
10. Which of the following can flow?
a. Fluids
b. Only liquids
c. Solids and liquids
d. Solids and gases
Explanation:
1) option d
2) option d
3) option a
4) option d
5) option c
6) option c
7) option d
8) option a
9) option a
10) option a
I think u Understand the answer.