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Kinetic Theory · Question 25

NEET 2013MCQMedium📈 Topic in 12% papers+4−1
1

The amount of heat energy required to raise the temperature of 1 g of Helium at NTP, from T1 K to T2 K is

  1. 34Na kB (T2 - T1)
  2. 34Na kB ( T2T1 )
  3. 38Na kB (T2 - T1)
  4. 32Na kB (T2 - T1)

Answer

(3) 38Na kB (T2 - T1)

Solution

Number of moles of helium: n = 14

Helium is monatomic: Cv = 32R

Heat required (gas heated at constant volume): Q = nCv T

= 14 32R(T2 - T1)

= 38R(T2 - T1)

R = Na kB

Q = 38Na kB (T2 - T1)

Answer: (3)

NEET 2013

Keep practising — Kinetic Theory

2

In a vessel, the gas is at pressure P. If the mass of all the molecules is halved and their speed is doubled, then the resultant pressure will be

  1. 2P
  2. P
  3. P/2
  4. 4P
NEET 2013 (Karnataka)
3

At 10 the value of the density of a fixed mass of an ideal gas divided by its pressure is x. At 110 this ratio is

  1. 10110x
  2. 283383x
  3. x
  4. 383283x
AIPMT 2008
4

The equation of state for 5 g of oxygen at a pressure P and temperature T, when occupying a volume V, will be (where R is the gas constant)

  1. PV = (5/32)RT
  2. PV = 5RT
  3. PV = (5/2)RT
  4. PV = (5/16)RT
AIPMT 2004
5

To find out degrees of freedom, the expression is

  1. f = 2 - 1
  2. f = + 12
  3. f = 2 + 1
  4. f = 1 + 1
AIPMT 2000

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