MDCAT Gases MCQs
Customize your practice drill: select target topics, configure your question limit (up to 180 MCQs per test), and choose your mode.
Total Topics
8
Selected Topics
1
Available MCQs
101
Question Limit
Up to 180
Select Topics to Practice
Questions will be drawn only from checked topics.
Test Configuration
Configure question count (limit 180) and testing mode.
Selected topics have 101 total questions. Test will draw 50 shuffled MCQs.
Sample Gases MCQs with answers
Try these questions, then open the answer to check your reasoning. Use the quiz above for more topics and a complete review.
Kinetic Theory
1. Gas is enclosed in a container of 20cm3 with the moving piston. According to kinetic theory of gases, what is the effect on freely moving molecules of the gas if temperature is increased from C to .
- A. Colliding capability of molecule will become lower
- B. Pressure will become one half
- C. Temperature has no effect on freely moving molecules
- D. Volume will be increased
View answer and explanation
Answer: D. Volume will be increased
With a freely moving piston the external pressure stays constant, so heating the gas makes it expand according to Charles's law (V proportional to T). Raising the temperature from to increases the molecular kinetic energy and the volume increases. The other options wrongly suggest pressure halving or no effect.
Kinetic Theory
2. A gas is compressed to one-fourth of its original volume while its temperature is doubled. The new pressure will be:
- A. 16P
- B. 1/4P
- C. 8P
- D. 2P
View answer and explanation
Answer: C. 8P
**Combined Gas Law:** (. **Given Conditions:** - /4 - ₁ **Calculation:** ( /4) / ( ₁) Solving for ₁) / ( /4 × ) = 8 . **Key Point:** The pressure becomes 8 times the original pressure.
Kinetic Theory
3. Gases possess a volume which is which among the following:
- A. Different
- B. Fixed
- C. Not fixed
- D. In definite
View answer and explanation
Answer: D. In definite
A gas has no fixed volume of its own - it expands to fill its container, so its volume is indefinite (not fixed). Hence 'in definite' (indefinite) is correct.
About this unit
MDCAT Gases — Unit 19
822 practice MCQs covering Kinetic Theory, STP, Boyle's Law, Charles's Law, Absolute Zero, Ideal Gas Law, Gas Constant, Real Gases. Select custom topics and sit tailored tests up to 180 questions per drill.
Common questions about Gases practice
How many Gases MCQs are available on DIFF. MDCAT?
The current Gases question bank contains 822 practice MCQs across 8 topics. This is the bank size, not the length of one test. Choose your topics and a question count from 1 to 180, limited by the questions available in those topics.
Which topics does the Gases quiz cover?
The selectable topics are Kinetic Theory, STP, Boyle's Law, Charles's Law, Absolute Zero, Ideal Gas Law, Gas Constant, Real Gases. Use Select all for a broad chapter drill, Clear to start a focused selection, or choose individual topics. Questions are drawn from your chosen topics, so you can target a weak concept before returning to a wider test.
How do I build a custom Gases test?
Open the chapter builder, select one or more topics, enter your question count, and choose Tutor Mode or Timed Exam. The available-question total updates with your selection. Start Test generates a shuffled drill; you do not have to follow a fixed Quiz 1 or Quiz 2 sequence.
What is the difference between Tutor Mode and Timed Exam?
Tutor Mode gives feedback and an explanation after you choose an option, and you can change or clear that choice. Timed Exam runs a countdown and keeps explanations hidden until submission. Both modes let you move between questions, use the paper map, and submit for a complete review.
How do I review and download my Gases quiz?
Select Submit Quiz, then Submit & View Explanations. The review includes every question in your test, all options, your selection, the marked correct answer when a key is available, and the explanation. Download PDF saves a paginated review; Download Review saves an HTML copy you can open in a browser. The review also includes DIFF. MDCAT community links.
How should I use Gases MCQs to improve?
Start with a short tutor drill on one of these topics: Kinetic Theory, STP, Boyle's Law. Read the explanation for incorrect and uncertain answers, revise the relevant textbook section, and retry before taking a timed drill. Compare your reasoning with the answer key rather than memorising the option letter.