Would you prefer to slide or roll a log of wood along the road? Why?

Would you prefer a vlotmeter over a potentiomer to measure the emf of a battery?

Would you prefer a material having a high melting point or a low melting point to be used as a cathode in a diode?

Among NH_(3),H_(2)O , and HF , which would you expect to have highest magnitude of hydrogen bonding and why?

Hydrogen may be prepared in the laboratory by the action of a metal with an acid. Which of the acids dilute sulphuric, concentrated sulphuric, dilute nitric and concentrated nitric would you choose ? Explain why you would not use the acids you reject.

Which element in each of the following pairs would you expect to have higher first ionisation energy and why? H ,He

Which element in each of the following pairs would you expect to have higher first ionisation energy and why? F ,Cl

Which element in each of the following pairs would you expect to have higher first ionisation energy and why? N, O

Two different types of rubber are found to have the stress-strain curves shown in fig. (a) In which significant ways do these curves differ form the stress-strain curve of a metal wire. (b) A heavy machine is to be installed in a factory. To absorb vibrations of the machine, a block of rubber is placed between the machinery and the floor. which of the two rubbers A and B would you perfer to use for this purpose? why? (c) Which of the two rubber materials would you choose for a car tyre ?

It is easier to roll than to pull a barrel along a road. Explain.

List any three reasons why you would think that you are sick and ought to see a doctor. If only one of these symptoms were present, would you still go to the doctor? Why or why not?