NSO Level 1- Science Olympiad (SOF) Class 8: Questions 694 - 697 of 1076
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Question number: 694
Question
The substance with highest ignition temperature among the following fuels is
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Coal | |
b. | Petrol | |
c. | Kerosene | |
d. | Alcohol | |
Question number: 695
Question
Green leaves do not catch fire easily but dry leaves catch fire at once. The possible reason would be
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Green leaves have a high ignition temperature than dry leaves. | |
b. | Presence of moisture increases the ignition temperature of green leaves. | |
c. | Both a. and b. are correct | |
d. | Question does not provide sufficient data or is vague | |
Question number: 696
Question
Diamond and graphite are different forms of
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Silica | |
b. | Sulphur | |
c. | Phosphorus | |
d. | Carbon | |
Question number: 697
Question
Aquatic animals lay thousands of eggs at a time while reptiles lay comparatively less number of eggs. The reason is
Choices
| Choice (4) | Response | |
|---|---|---|
a. | Other aquatic animals feed on the eggs and young ones. So the chances of survival is less. | |
b. | The movement of sperms and eggs is controlled by wind and movement of water. So the chances of fertilisation is less. | |
c. | External fertilisation takes place in most of the aquatic animals while internal fertilisation takes place in reptiles. | |
d. | All a. , b. and c. are correct | |