Suppose your parents have constructed a two room house and you want that in the living room there should be a provision of one electric bulb, one electric fan, a refrigerator and a plug point for appliances of power up to 2 kilowatts. Draw a circuit diagram showing electric fuse and earthing as safety devices.

Explain giving reasons the bending of the shoot tip of a plant towards light source coming from one side of the plant.

It is desired to obtain an erect image of an object, using concave mirror of focal length of 12 cm.

(i) What should be the range of the object distance in the above case?

(ii) Will the image be smaller or larger than the object? Draw a ray diagram to show the formation of image in this case.

(iii) Where will the image of this object be, if it is placed 24 cm in front of the mirror?

In the figure given below, a narrow beam of white light is shown to pass through a triangular glass prism. After passing through the prism, it produces a spectrum XY on the screen.

(i) Name the phenomenon.

(ii) State the colors seen at X and Y.

(iii)Why do different colors of white light bend at different angles through a prism?

OR

(i) What is visible spectrum?

(ii) Why is red used as the stopping light at traffic signals?

(iii)Two triangular glass prisms are kept together connected through their rectangular side. A light beam is passed through one side of the combination. Will there be any dispersion? Justify your answer.

(I)Metal X is found in nature as its sulphide XS. It is usedin the galvanisation of iron articles. Identify the metal X.How will you convert this sulphide ore into the metal?Explain with equations.

OR

(II)State the reason for the following:

(i) Aluminium oxide is called anamphoteric oxide.

(ii) An iron strip dipped in a blue copper sulphatesolution turns the blue solution pale green.

(iii) Hydrogen gas is not evolvedwhen most metals react with nitric acid.

(iv) Calcium does not occur in freestate in nature.

(v) Sodium or potassium metals are kept immersed underkerosene.