Equal volumes of water are added to three cylindrical jars A, B and C of same height and radii r_A, r_B and r_C respectively with r_B < r_A < r_C. If you blow air into the mouth of these jars, which tube will produce the shrillest note?

1. A
2. B
3. C
4. All will produce the notes of same shrillness

A metallic wire is stretched in such a way that its new length becomes twice the original length. How does its specific heat capacity change?

1. becomes double
2. becomes 4 times
3. becomes 1⁄4 times
4. remains the same

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