An object is placed at a distance of 10 cm from a convex mirror of focal length 15 cm. Find the position of the image formed by the mirror.

Show how you would connect three resistors each of resistance 6 Ω, so that the combination has a resistance of 9 Ω. Also justify your answer.

(a) Two magnetic field lines do not intersect each other. Why?

(b) How is a uniform magnetic field in a given region represented? Draw a diagram in support of your answer

Write one chemical equation each for the chemical reaction in which the following have taken place :

(a) Change in colour

(b) Change in temperature

(c) Formation of precipitate

Mention colour change/temperature change (rise/fall)/compound precipitated along with equation.