Quiz on Calcium (ca)
Calcium is a silvery-white metal with the atomic number 20. It belongs to the alkaline earth metals group in the periodic table. Calcium is essential for living organisms, particularly in the formation of bones and teeth. It also plays a vital role in muscle contraction, nerve function, and blood clotting. Calcium was first isolated by Sir Humphry Davy in 1808 through the electrolysis of lime and mercuric oxide. It is not found freely in nature but occurs in compounds like calcium carbonate (CaCO₃), found in limestone and marble. Calcium compounds are used in cement, glass, and plaster of Paris.
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MCQ Questions on Quiz on Calcium (ca)
Q. What is the chemical symbol for Calcium?
A. Cl
B. Ca
C. Cs
D. Cm
Correct: Option (B)
Q. What is the atomic number of Calcium?
A. 18
B. 19
C. 20
D. 21
Correct: Option (C)
Q. To which group does Calcium belong in the periodic table?
A. Alkali metals
B. Transition metals
C. Halogens
D. Alkaline earth metals
Correct: Option (D)
Q. Who discovered Calcium?
A. Carl Wilhelm Scheele
B. Sir Humphry Davy
C. Antoine Lavoisier
D. Dmitri Mendeleev
Correct: Option (B)
Q. In which year was Calcium discovered?
A. 1807
B. 1808
C. 1894
D. 1774
Correct: Option (B)
Q. What is one of the most common compounds of Calcium found in nature?
A. Calcium chloride
B. Calcium carbonate
C. Calcium phosphate
D. Calcium sulfate
Correct: Option (B)
Q. Which part of the human body contains the most Calcium?
A. Skin
B. Bones and teeth
C. Muscles
D. Blood
Correct: Option (B)
Q. What is the role of Calcium in the human body?
A. Helps in photosynthesis
B. Helps in muscle contraction and blood clotting
C. Acts as an enzyme
D. Forms DNA
Correct: Option (B)
Q. Which of the following materials is made using Calcium compounds?
A. Plastic
B. Cement and glass
C. Textiles
D. Petrol
Correct: Option (B)
Q. What is the color and physical state of Calcium at room temperature?
A. Golden solid
B. Silvery-white solid
C. Gray liquid
D. Colorless gas
Correct: Option (B)