MCQs

Q171: CaO is the chemical formula of?

• A) Calcium carbonate
• B) Calcium oxide
• C) Calcium hydroxide

Q172: The pH of an alkaline substance is?

• A) Less than 7
• B) Equal to 7
• C) Greater than 7

Q173: At what temperature does water have maximum density (specific gravity)?

• A) 0°C
• B) 4°C
• C) 25°C

Q174: What is the molecular weight of ammonia (NH₃)?

• A) 14
• B) 17
• C) 18

Q175: The unit of radioactivity is?

• A) Electron volt
• B) Electron ampere
• C) Becquerel

Q176: The study of heat changes in chemical reactions is called?

• A) Electro chemistry
• B) Thermo chemistry
• C) Organic chemistry

Q177: Which of the following is not parasitic fungus of plants? Mildews, Armillaria, Rust, None of these

• A) Mildews
• B) Armillaria
• C) None of these

Q178: Which of the following is not related with apoptosis? Controlling the number of neurons, Loss of tail of developing human embryos, Loss of tissue between developing digits, None of these

• A) Controlling the number of neurons
• B) Loss of tail of developing human embryos
• C) None of these

Q179: Which type of chlorophyll is found in all types of algae?

• A) Chlorophyll c
• B) Chlorophyll b
• C) None of these

Q180: Wood is not formed in ______?

• A) Gymnosperms
• B) Monocots
• C) Dicots