Question

III. Answer the following questions in brief
1. Why is LPG labelled as inflammable substance?
2. Biodegradable and non – biodegradable should be collected separately. Give reason
3. Give two advantages of friction.
4. Why it is difficult to move heavier objects? 5. It is easier to hold a school bag with wide straps than the one with thin strings. Explain giving reason
6. A solid exerts a force of 500 N. calculate the pressure exerted to the surface where area of contact is 2000 cm2.
7. Define
(a) Electrostatic force
(b) Gravitational ​

Answer 1

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