MCQs
Read every question, see the correct answer, and understand the explanation at your own pace. Study mode has no timer and no negative marking.
Correct answer
D. Entomology
Explanation
Entomology is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
A. Calcium sulfate
Explanation
Permanent hardness of water is due to the presence of Calcium sulfate. Permanent hardness is hardness (mineral content) that cannot be removed by boiling. When this is the case, it is usually caused by the presence of calcium sulfate and/or magnesium sulfates in the water, which do not precipitate out as the temperature increases.
Correct answer
A. Heel
Explanation
Heel is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
D. Alessandro volta
Explanation
Alessandro volta is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
C. February
Explanation
February is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
C. Isaac Newton
Explanation
The scientist who formulated the laws of motion and the law of universal gravitation is Sir Isaac Newton. He first stated these laws in his seminal work, Philosophiæ Naturalis Principia Mathematica, published in 1687, laying the foundation for classical mechanics.
Correct answer
B. Cryosphere
Explanation
The frozen water on Earth is known as the cryosphere. The cryosphere includes all the frozen parts of the Earth, such as: Sea ice: Frozen seawater that forms blocks called “floes”. These floes can be up to 5 km wide and 5 m thick, and are moved by ocean currents and winds. Ice sheets: Huge pieces of glacial ice that are at least 50,000 km2 in area. The only ice sheets left on Earth are in Antarctica and Greenland. Glaciers: Found on high mountaintops around the world. Permafrost: Frozen ground in the soils of polar regions. Snow: Frozen water that is found mainly in Antarctica and Greenland. The cryosphere is a vital part of the global climate system and has a significant impact on it. The term “cryosphere” comes from the Greek word kryos, which means “frost” or “ice cold”.
Correct answer
B. Oxygen
Explanation
Oxygen is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
A. cellulose
Explanation
cellulose is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.
Correct answer
C. 5.972 × 10 24 kg.
Explanation
5.972 × 10 24 kg. is the correct answer. Review the question and compare it with the other choices to remember this fact for future exams.