Assertion Bending of wire does not affect electrical resistance.

Reason Resistance of a wire is proportional to resistivity of material.

1. Both Assertion and Reason are true
2. Both Assertion and Reason are false
3. Assertion is false but Reason is true.
4. Assertion is true but Reason is false

A moving ship continuously sends in ultrasonic pulses down to the sed-bed and records the time delays of the reflected pulses. The variation of time delays recorded versus the positions of the ship is plotted in the following graph. Which of the position indicates the deepest sea bed?

1. A
2. B
3. C
4. D

A light moves from denser to rarer medium, which of the following is correct?

1. Energy increases
2. Frequency increases
3. Velocity increases
4. None of the above

Observe the heating curve of water

Which of the following represent boiling?

1. OA
2. AB
3. BC
4. CD