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Class 11 Kinetic Theory worksheet
CBSE Physics. Gas laws, rms speed, kinetic energy and temperature, heat capacities. Every sheet has 20 questions in three sections and an answer key, and the numbers change every time.
Sample questions
Real questions from this chapter, as the app sets them. Tap Answer to see the answer and working.
Section A · multiple choice
- 1.
How many moles of gas are in a 21 L container at 2 × 10⁵ N/m² and 430 K? (R = 8.31 J/mol K)
- 0.12
- 11.75
- 2.35
- 1.18
Answer
(d) 1.18
n = pV/RT
- 2.
Nitrogen is heated from 410 K to 6560 K. Its rms speed becomes how many times?
- 16
- 8
- 5
- 4
Answer
(d) 4
v_rms ∝ √T
- 3.
The average kinetic energy of a gas molecule at 390 K is (k = 1.38 × 10⁻²³ J/K):
- 2.69 × 10⁻²¹ J
- 5.38 × 10⁻²¹ J
- 8.07 × 10⁻²¹ J
- 1.61 × 10⁻²⁰ J
Answer
(c) 8.07 × 10⁻²¹ J
(3/2)kT
Section B · short answer
- 4.
A gas occupies 18 L at 5 atm and 400 K. What is its volume at 1 atm and 520 K? (2 decimal places where needed.)
Answer
117 L
p₁V₁/T₁ = p₂V₂/T₂
- 5.
How many molecules are there in 49 L of a gas at 9 × 10⁵ N/m² and 460 K? (k = 1.38 × 10⁻²³ J/K)
Answer
6.95 × 10²⁴
N = pV/(kT)
Section C · long answer
- 6.
A cylinder of volume 7 L contains argon (molar mass 40 g/mol) at 10 × 10⁵ N/m² and 330 K. Find (a) the number of moles, (b) the mass of gas, (c) the number of molecules. (R = 8.31 J/mol K, Nₐ = 6.02 × 10²³) (2 decimal places where needed.)
Answer
(a) 2.55 mol; (b) 102.10 g; (c) 1.54 × 10²⁴
n = pV/RT
Fresh sheets for your child
In the app, every Kinetic Theory sheet is new: the app remembers the questions your child has already had and leaves them out. Print the sheet as a PDF, or use notebook mode and write the answers in a notebook.
Coming soon for Android and iPhone.