What is a solenoid? Draw the pattern of magnetic field lines of

(i)- a current carrying solenoid and

(ii)- a bar magnet.

List two distinguishing features between the 2 fields.

An object is placed at a distance of 60 cm from a concave lens of focal length 30 cm.

(i) use lens formula to find the distance of the image from the lens

(ii) List 4 characteristics of the image (nature, position, size, erect/inverted) formed by the lens in this case.

(iii) Draw ray diagram to justify you answer of part (ii).

(a) With the help of a suitable circuit diagram, prove that the reciprocal of the equivalent resistance of a group of resistances joined in parallel is equal to the sum of the reciprocals of the individual resistors.

(b) In an electric circuit 2 resistors of 12 Ω each are joined in parallel to the a 6V battery. Find the current drawn from the battery.

OR

An electric lamp of resistance 20Ω and a conductor of resistance 4Ω are connected to a 6V battery as shown in the circuit. Calculate:

(a) The total resistance of the circuit

(b) the current through the circuit

(c) the potential difference across the

(i) the electric lamp

(ii) conductor

(d) power of the lamp.

Blue litmus solution is added to two test tubes A and B containing dilute HCl and NaOH solution respectively. In which test tube a colour change will be observed? State the colour change and give its reason.

OR

What is observed when 2 mL of dilute hydrochloric acid is added to 1 g of sodium carbonate taken in a clean and dry test tube? Write chemical equation for the reaction involved.

In three test tubes A, B and C, three different liquids namely, distilled water, underground water and distilled water in which a pinch of calcium sulphate is dissolved, respectively are taken. Equal amount of soap solution is added to each test tube and the contents are shaken. In which test tube will the length of the foam (lather) be longest? Justify your answer.