The diagram below shows the top view of the Wire A shown by a cross (X), carrying current into the plane of the paper. Which of the compasses is correctly aligned with the magnetic field produced by the current carrying wire?

1. Only 1 is aligned
2. Only 2 is aligned
3. Both 1 and 2 are aligned
4. Both 1 and 2 are not aligned

Three substances A, B and C of same mass are present at their respective melting points. On heating, if they melt completely in 5 minutes, 7 minutes and 3 minutes respectively, then which substance has the highest specific latent heat?

(Assume heat is absorbed at the same rate)

1. Substance A
2. Substance B
3. Substance C
4. All the substances have same specific latent heat

Complete the following by choosing the correct answers from the bracket:

(a) A car is moving in uniform circular motion. The direction of friction between the tyres and the path is …………… [towards the centre / tangential to the path].

(b) When a ray of light passes from a denser to a rarer medium, its wavelength …………… [decreases / increases].

(c) The lid of a calorimeter minimises heat loss by …………… [convection / radiation].

(d) Quality of sound depends on its …………… [amplitude / waveform].

(e) A substance whose resistance becomes almost negligible at a temperature near absolute zero is called a …………… [semiconductor / superconductor].

(f) …………… radiation deviates minimum in a magnetic field [Alpha / Beta].

State two factors on which the position of Center of Gravity of a body depends.