Friction is necessary evil, comment. Mention some methods of reducing faction.

Friction is a _____ evil.

Mention various methods of solid waste disposal.

Mention some important uses of sulphuric acid.

What is 'Bleaching powder' ? Mention one method of its preparation.

Sterilisation techniques are generally fool proof methods of contraception with least side effects. Yet, this is the last option for the couples because (i) It is almost irreversible (ii) of the misconception that it will reduce sexual urge/drive (iii) it is a surgical procedure (iv) of lack of sufficient facilites in many parts of the country Choose the correct option

Which is a suitable method to decrease friction

What is an optical fibre? Mention some of its uses.

20 N force is necessary to overcome the resistance of a load of 100 kg on a horizontal surface. Calculate the coefficient of sliding friction.

How acetic acid is prepared by using Grignard's reagent? Give one method of distinguish acetic acid from formic acid. Mention two uses of acetic acid.

What are different types of friction ? What are advantages and disadvantages of friction. What precautions are taken to reduce friction.