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Chemistry MCQs

Prepare for competitive exams with our topic-wise Chemistry MCQs covering fundamental and advanced concepts. These multiple-choice questions include atomic structure, chemical bonding, periodic table, acids & bases, organic chemistry, thermodynamics, chemical equations, mole concept, electrochemistry, and biochemistry. Ideal for science students and job aspirants appearing in PPSC, FPSC, CSS, NTS, SPSC, BPSC, KPSC, ETEA, AJKPSC, and other testing services. A valuable resource for teachers, educators, and candidates targeting science educator posts, laboratory roles, and general science sections in public sector exams.

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1 Chemistry MCQs

Which atmospheric layer absorbs most of the Sun’s ultraviolet radiation?

  • Troposphere
  • Stratosphere
  • Mesosphere
  • Ionosphere
0 Comments
Correct Answer: B. Stratosphere

Explanation:

The stratosphere is the second layer of Earth’s atmosphere, extending from approximately 12 ... Read More Details

2 Chemistry MCQs

The stratosphere absorbs most of the __________ from the Sun.

  • Infrared radiation
  • Ultraviolet radiation
  • Ozone layer
  • Radio waves
0 Comments
Correct Answer: B. Ultraviolet radiation

Explanation:

The stratosphere is the second layer of Earth’s atmosphere, located above the troposphere ... Read More Details

3 Chemistry MCQs

The mesosphere ranges from ________ km to ________ km.

  • 46 – 85
  • 48 – 85
  • 50 – 85
  • 52 – 85
0 Comments
Correct Answer: C. 50 – 85

Explanation:

The mesosphere is the third layer of Earth’s atmosphere, lying above the stratosphere ... Read More Details

4 Chemistry MCQs

Which layer burns up most meteors before they reach Earth’s surface?

  • Troposphere
  • Stratosphere
  • Mesosphere
  • Ionosphere
0 Comments
Correct Answer: C. Mesosphere

Explanation:

The mesosphere is the third layer of Earth’s atmosphere, located above the stratosphere ... Read More Details

5 Chemistry MCQs

The thermosphere extends from about 85 km to ________ km.

  • 670 km
  • 680 km
  • 690 km
  • 700 km
0 Comments
Correct Answer: C. 690 km

Explanation:

The thermosphere is one of the upper layers of Earth’s atmosphere. It lies ... Read More Details

6 Chemistry MCQs

The atmosphere is held in place by __________.

  • Pressure of the planet
  • Gravity of the planet
  • Electric charge of the planet
  • Heat of the planet
0 Comments
Correct Answer: B. Gravity of the planet

Explanation:

The Earth is surrounded by a layer of gases called the atmosphere. This ... Read More Details

7 Chemistry MCQs

Which statement about the ionosphere is correct?

  • Low density in morning, decreases more at night
  • High density in daytime, decreases at night
  • High density far above in day, increases at night
  • None of these
0 Comments
Correct Answer: B. High density in daytime, decreases at night

Explanation:

The ionosphere is a region of Earth’s upper atmosphere that extends roughly from ... Read More Details

8 Chemistry MCQs

Which layer extends from about 690 km to 10,000 km above Earth?

  • Troposphere
  • Mesosphere
  • Exosphere
  • Stratosphere
0 Comments
Correct Answer: C. Exosphere

Explanation:

The Earth’s atmosphere is divided into several layers based on temperature and composition. ... Read More Details

9 Chemistry MCQs

Atmospheric pressure is determined by the __________.

  • Mass of vertical column of gases
  • Mass of horizontal column of gases
  • Weight of vertical column of gases
  • Mass of vertical and weight of horizontal column of gases
0 Comments
Correct Answer: C. Weight of vertical column of gases

Explanation:

Atmospheric pressure is the pressure exerted by the air in Earth’s atmosphere on ... Read More Details

10 Chemistry MCQs

A planet can retain its atmosphere when __________.

  • Gravity is low and temperature is high
  • Gravity and temperature are both high
  • Gravity and temperature are constant
  • Gravity is high and temperature is low
0 Comments
Correct Answer: D. Gravity is high and temperature is low

Explanation:

The ability of a planet to retain an atmosphere depends mainly on two ... Read More Details

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