Vacuum is NOT air!!

2004PPp1q15 - Volume of bubble at bottom of lake (P1V1 = P2V2)

Answer: Option A

Since the air bubble is enclosed, PV at A is equal to PV at B.

                  PAVA = PBVB

(Patm + Pwater) VA = (Patm) VB

         (10 + 20) VA = 10 x 6

                       VA = 60 / 30

                            = 2 cm3

PP2008Q11OR Thermistor in series with fixed resistor, explanation on pd and graph

As both the fixed resistor and the thermistor are connected in series, the sum of potential difference across them will be equal to the emf of 6.0 V.