NCERT Class 7 Science-Physical and Chemical Changes[Chemical Changes] [NCERT Based General Studies (GS)]: Questions 1 - 5 of 6
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Question 1
Question MCQ▾
Chemical reactions taking place in a chemical changes are:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Direct combination or synthesis reaction | |
b. | Decomposition reactions AND Double displacement reactions | |
c. | Displacement reactions | |
d. | All b., a. and c. are correct | |
Question 2
Question MCQ▾
Chemical reaction involves the gain or loss of energy is called as:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Endothermic reaction | |
b. | Exothermic reaction | |
c. | Explosion | |
d. | None of the above | |
Question 3
Question MCQ▾
During a chemical change in addition to products following may be:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | A gas is formed AND A change in smell and colour may takes place | |
b. | Sound may be produced | |
c. | Heat, light or any other radiation may be given off or absorbed | |
d. | All a., b. and c. are correct | |
Question 4
Question MCQ▾
Why cut fruits or vegetables turns drown when exposed to air:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Due to release of phenolic compounds | |
b. | Due to release of enzymes | |
c. | Both a. and b. are correct | |
d. | Question does not provide sufficient data or is vague | |
Question 5
Question MCQ▾
The process of slowly eating away of a metal on exposure to air and moisture is called as:
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Rusting | |
b. | Rust | |
c. | Crystallization | |
d. | All of the above | |