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📝 Short Description:

Prepare for your MDCAT exam with these 20 multiple-choice questions (MCQs) on Gases, designed specifically for students targeting KMU, UHS, and SZABMU medical entrance exams. This collection of questions covers key concepts from gas laws, ideal gas equations, and the behavior of gases under different conditions, all of which are crucial for your understanding of physical chemistry.

These MCQs provide an in-depth look at the relationships between pressure, volume, temperature, and the number of gas molecules, aligned with the latest syllabus for Pakistani MDCAT students. Each question is crafted to test your grasp on the fundamental principles, like Boyle’s Law, Charles’ Law, and Avogadro’s Law. Whether you’re aiming for high scores or just reinforcing your understanding, these questions will help you prepare effectively for the MDCAT 2025.

This question bank is ideal for students looking to solidify their knowledge and improve their problem-solving skills. By practicing these questions, you’ll get closer to achieving your dream of entering a medical college in Pakistan.

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108

💨 3. Gases

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Name

1 / 20

1. The density of a gas is given by the formula:

D = m/V

D = P × M/(R × T)

D = P × T/V

D = m × R/T

2 / 20

2. The root mean square speed of gas molecules depends on:

The volume of the gas

The temperature of the gas

The pressure of the gas

The number of moles

3 / 20

3. Real gases deviate from ideal behavior at:

Low pressure and high temperature

High pressure and low temperature

Low pressure and low temperature

High pressure and high temperature

4 / 20

4. The Kinetic Molecular Theory explains that gas particles are:

In motion

Stationary

Polar

Attracting each other

5 / 20

5. The Boyle’s Law constant is equal to:

Volume × Pressure

Volume ÷ Pressure

Pressure ÷ Volume

Volume × Temperature

6 / 20

6. A gas behaves ideally at:

High pressure and low temperature

Low pressure and high temperature

High pressure and high temperature

Low pressure and low temperature

7 / 20

7. According to Graham’s Law, the rate of effusion of a gas is inversely proportional to:

Square root of its molar mass

Its temperature

Its pressure

Its volume

8 / 20

8. Gay-Lussac’s Law involves the relationship between the temperature and:

Volume

Pressure

Number of moles

Mass

9 / 20

9. The relationship between pressure and volume of a gas at constant temperature is:

Directly proportional

Inversely proportional

Independent

Exponential

10 / 20

10. The volume of a gas is directly proportional to its temperature at constant:

Mass

Pressure

Volume

Number of moles

11 / 20

11. Graham’s Law of Diffusion explains the relationship between the rates of diffusion of two gases and their:

Masses

Volumes

Temperatures

Molar masses

12 / 20

12. The compressibility factor (Z) for an ideal gas is:

13 / 20

13. Dalton’s Law of Partial Pressures states that the total pressure exerted by a gas mixture is equal to:

The sum of the volumes

The sum of the temperatures

The sum of the individual partial pressures

The sum of the masses

14 / 20

14. The value of R in the ideal gas law is called the universal gas constant, and it is:

0.0821 L·atm/(mol·K)

8.31 J/mol·K

1.00 atm

0.0821 K/mol·L

15 / 20

15. The pressure exerted by a gas is directly proportional to the:

Volume

Temperature

Number of moles

Density

16 / 20

16. Charles’ Law describes the relationship between the volume of a gas and:

Pressure

Temperature

Mass

Number of moles

17 / 20

17. Avogadro’s Law relates volume and:

Pressure

Temperature

Moles of gas

Density

18 / 20

18. The ideal gas equation is represented by:

P = VRT

PV = nRT

P + V = nRT

P = nRT

19 / 20

19. The volume of an ideal gas at STP (Standard Temperature and Pressure) is:

22.4 L

24.0 L

1.0 L

10.0 L

20 / 20

20. Boyle’s Law states that at constant temperature, the pressure of a gas is inversely proportional to its:

Volume

Temperature

Mass

Number of moles

Your score is

Pos.	Name	Score	Duration	Points
1	Nairah	100 %	5 minutes 9 seconds	20
2	MKHR	100 %	7 minutes	20
3	Faraz	95 %	2 minutes	19
4	Ane	95 %	2 minutes 11 seconds	19
5	G	95 %	2 minutes 12 seconds	19
6	Awais	95 %	3 minutes 6 seconds	19
7	Arbaz Baloch	95 %	3 minutes 14 seconds	19
8	Zaheer Ahmed	95 %	3 minutes 37 seconds	19
9	Naina	95 %	3 minutes 57 seconds	19
10	Muhammad Alam	95 %	4 minutes 5 seconds	19
11	pooran	95 %	4 minutes 13 seconds	19
12	Kamran	95 %	4 minutes 35 seconds	19
13	Duaa	95 %	5 minutes 26 seconds	19
14	Ahmad faraz	95 %	5 minutes 30 seconds	19
15	Student	95 %	5 minutes 47 seconds	19
16	....	95 %	6 minutes 16 seconds	19
17	KHR	95 %	6 minutes 34 seconds	19
18	Gull Maqbool	90 %	2 minutes 37 seconds	18
19	Vashnavi Ramesh kumar	90 %	2 minutes 43 seconds	18
20	Chandar	90 %	3 minutes 20 seconds	18
21	Abdul Majeed bhangwar	90 %	3 minutes 33 seconds	18
22	Pari	90 %	3 minutes 40 seconds	18
23	Hururu	90 %	3 minutes 53 seconds	18
24	Farman ali	90 %	4 minutes 13 seconds	18
25	Muhammad Sarwar	90 %	4 minutes 26 seconds	18
26	Sarfraz	90 %	4 minutes 29 seconds	18
27	Dr R zeeb	90 %	5 minutes 2 seconds	18
28	Umema	90 %	5 minutes 24 seconds	18
29	Ali Abbasi	90 %	5 minutes 25 seconds	18
30	harika	90 %	7 minutes 7 seconds	18
31	Nasarullah Baloch	90 %	7 minutes 18 seconds	18
32	M Ayan	90 %	7 minutes 24 seconds	18
33	Maqsood Baloch	90 %	7 minutes 26 seconds	18
34	Batool	90 %	7 minutes 27 seconds	18
35	RAJESH	85 %	3 minutes 38 seconds	17
36	Ghulam mustafa	85 %	3 minutes 41 seconds	17
37	TRK	85 %	4 minutes 20 seconds	17
38	Faiza Raees	85 %	4 minutes 40 seconds	17
39	Sa	85 %	5 minutes 16 seconds	17
40	DUAA	85 %	7 minutes 7 seconds	17
41	pirthavi	85 %	7 minutes 24 seconds	17
42	Huzaifa	85 %	7 minutes 49 seconds	17
43	Faizan	85 %	8 minutes 47 seconds	17
44	Abdul Rehman	85 %	13 minutes 53 seconds	17
45	Samra Nazir	85 %	19 minutes 6 seconds	17
46	Hina	80 %	3 minutes 18 seconds	16
47	Faraz	80 %	3 minutes 31 seconds	16
48	Naeem Jatoi	80 %	3 minutes 38 seconds	16
49	Muskan	80 %	3 minutes 46 seconds	16
50	Hina	80 %	3 minutes 58 seconds	16
51	Fayoo Jan	80 %	4 minutes 54 seconds	16
52	Rani	80 %	5 minutes 49 seconds	16
53	......	80 %	6 minutes 41 seconds	16
54	Zara	80 %	7 minutes 41 seconds	16
55	zabii	80 %	8 minutes 51 seconds	16
56	Gulsher Abbas	80 %	10 minutes 2 seconds	16
57	LR	75 %	3 minutes	15
58	Hina khan	75 %	4 minutes	15
59	Afzal mumtaz	75 %	4 minutes 47 seconds	15
60	Al	75 %	5 minutes 26 seconds	15
61	Ameet	75 %	5 minutes 27 seconds	15
62	Niaz Muhammad Jamali	75 %	5 minutes 31 seconds	15
63	masroor ahmad	75 %	6 minutes 28 seconds	15
64	Fayaz magsi	75 %	8 minutes 12 seconds	15
65	iqra buriro	75 %	16 minutes 14 seconds	15
66	Iqra Ali	75 %	30 minutes 27 seconds	15
67	Akshra Kumari	70 %	3 minutes 4 seconds	14
68	M Nasir	70 %	4 minutes 37 seconds	14
69	Haiba	70 %	4 minutes 55 seconds	14
70	Muhammad Ahtisham Khalil	70 %	5 minutes 27 seconds	14
71	Muhammad sadiq	70 %	5 minutes 30 seconds	14
72	Chemistry	70 %	6 minutes 40 seconds	14
73	Rajesh Kumar	70 %	6 minutes 43 seconds	14
74	Remisha	70 %	11 minutes 41 seconds	14
75	masad	65 %	3 minutes 4 seconds	13
76	sania hanif	65 %	3 minutes 15 seconds	13
77	Khush bakht Jawad	65 %	3 minutes 21 seconds	13
78	Gayatri	65 %	4 minutes 51 seconds	13
79	Pozat kha	65 %	5 minutes 30 seconds	13
80	Linta Ayaz	65 %	7 minutes 19 seconds	13
81	H	60 %	2 minutes 55 seconds	12
82	Aliza	60 %	3 minutes 12 seconds	12
83	Deva	60 %	3 minutes 40 seconds	12
84	S	60 %	4 minutes 21 seconds	12
85	Shubham	55 %	6 minutes 13 seconds	11
86	Noor	50 %	9 minutes 55 seconds	10
87	Aiman	40 %	2 minutes 1 seconds	8
88	Maheenshar	35 %	2 minutes 13 seconds	7
89	Abid ali	35 %	4 minutes	7
90	Sahtoo Malik	35 %	4 minutes 58 seconds	7
91	Sarfraz	10 %	24 seconds	2
92	Faiza	10 %	31 seconds	2
93	Abdul Majeed	10 %	1 minutes 28 seconds	2
94	Zara	10 %	1 minutes 44 seconds	2
95	MKHR	5 %	22 seconds	1
96	Arbaz	5 %	26 seconds	1
97	Hina kamal	5 %	33 seconds	1
98	Masood	5 %	34 seconds	1
99	Pozat Khan	5 %	39 seconds	1
100	A k	5 %	53 seconds	1

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