Physics Past Questions and Answers

When two cells of negligible internal resistances and equal e.m.f. denoted by E\(_1\) and E\(_2\) are connected in parallel, combined e.m.f. E is given by

A E = E\(_1\) + E\(_2\)E = \(\frac{E_1}{E_2}\)
B \(\frac{1}{E} = \frac{1}{E_1} + \frac{1}{E_2}\)
C E = E\(_1\) = E\(_2\)

Question 2002:

Which of the following statement about viscosity is not true? it

A Depends on areas of the surfaces in contact
B Occurs in fluids
C Is independent of the relative velocity of the layers
D Depends on the tangential force between the layers

Question 2003:

In a solar panel for heat supply, state the function of each of the following parts: (a) metal flat plate; (b) thermal insulator: (c) tubes.

Question 2004:

(a) In the design of an optical fibre, what type of material is most suitable for the design of the core?
(b) State one condition necessary to confine signals to the core of an optical fibre.

Question 2005:

The velocity v, of a wave in a stretched string, depends on the tension T, in the spring and the mass per unit length of the spring. Obtain an expression for v in terms of T and u, using the method of dimensions.