Two vessels A and B contain the same ideal gas. The volume of B is twice that of A, the pressure in B is twice that in A and the temperature of B is twice that of A. The ratio of the number of gas molecules in A and B is _______________.

(a)

1:2

(b)

2:1

(c)

1:4

(d)

4:1

According to Boyle's law, PV = C when the temperature of the gas remains constant. The value of C depends on ______________.

(a)

temperature of the gas

(b)

nature of the gas

(c)

quantity of the gas

(d)

both temperature and quantity of the gas

The pressure of a gas contained in a closed vessel is increased by 0.4% when heated by 1°C. The initial temperature was ____________________.

(a)

250 K

(b)

250°C

(c)

25 K

(d)

25^oC

A temperature difference of 25°C is equivalent to a temperature difference of ______________.

(a)

25°F

(b)

45°F

(c)

67°F

(d)

77°F

A temperature at which both the Fahrenheit and the centigrade scales have the same value is ___________

(a)

40°

(b)

-40°

(c)

20

(d)

- 20°