Passage based question

A student using a constant volume gas thermometer measures d pressure at d triple point of water (0.01°C) to be 45000 N/m² and d prssure at d boiling temperature of water (100°C) 2 b 60000N/m². assume that pressure varies linearly with temp.Answer d following questions.

(1)The celcius temp. at which pressure of d gas is zero will be nearly-

(A)-273°C (B)-312°C (C)-267°C (D)-312°C

(2)Using the given thermometer, the pressure measured by the student when the celcius temp.is 50°C will be

(A)4.45*10⁴N/m² (B)4.85*10⁴N/m² (C)5.25*10⁴N/m² (D)5.75*10⁴N/m²

(3)Pressure of a given amount of gas is directly proportional 2 d temp of the kelvin scale. Which one is correct?

(A)This statement is strictly valid fr the gas in the thermometer being used.

(B)This statement is not stictly valid fr the gas in the thermometer being used.

(C)Strict validit cant b calculated for given thermometer.

(D)This statement will become more and more valid as the gas pressure increases.