| Choose the correct option: |
| (i) Thunderstorms are accompanied by: |
| Choose the correct option: |
| (ii) How many types of soil can be categorised on the basis of size of particles? |
| Choose the correct option: |
| (iii) During heavy exercise, we get cramps in the legs due to accumulation of |
| Choose the correct option: |
| (iv) The colour of blood is red due to the presence of |
| Choose the correct option: |
| (v) The excretory substance in fishes is: |
| Choose the correct option: |
| (vi) The reproductive part of a plant is the: |
| Choose the correct option: |
| (vii) The motion of a pedal of a bicycle is: |
| Choose the correct option: |
| (viii) A battery is a group of: |
| Choose the correct option: |
| (ix) The power of lens is measured in: |
| Choose the correct option: |
| (x) The percentage of water present in human body is: |
| (i) What are nanosecond and microsecond? |
| (ii) Change 30 km/hr into m/s. |
| Distinguish between the following: |
| (i) Acid and alkali |
| (ii) Base and alkali |
| (iii) Organic acid and mineral add. |
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