Q. 91. Which of the following elements behave chemically, both as a metal and a non-metal?
(A) Argon
(B) Xenon
(C) Carbon
(D) Boron
Answer:
(D) Boron
Explanation:
Boron is classified as a metalloid. Elements that are metalloids exhibit intermediate chemical and physical properties, behaving somewhat like both metals and non-metals depending on conditions.
Q. 92. Faraday’s Law is associated with:
(A) Electrolysis
(B) reaction of gases
(C) pressure of gases
(D) Temperature and pressure
Answer:
(A) Electrolysis
Explanation:
Michael Faraday formulated the famous laws of electrolysis, establishing the mathematical relationship between the amount of substance altered at an electrode and the quantity of electric charge passed.
Q. 93. Lime water in the open air turns into milky because of
(A) Oxygen
(B) Hydrogen
(C) Carbon Dioxide
(D) Nitrogen dioxide
Answer:
(C) Carbon Dioxide
Explanation:
When lime water (Calcium hydroxide solution) is exposed to air, it reacts with carbon dioxide gas to form an insoluble precipitate of calcium carbonate, which makes the liquid appear milky.
Q. 94. Soaps are the ______ salts of higher fatty acids
(A) Sodium
(B) Alkali
(C) Fibre
(D) Potassium
Answer:
(A) Sodium
Explanation:
Soaps are chemically defined as the sodium or potassium salts of long-chain (higher) carboxylic acids (fatty acids).
Q. 95. Pyridine is an example of which compound?
(A) Aldehyde
(B) Alkene
(C) Heterocyclic
(D) Ketone
Answer:
(C) Heterocyclic
Explanation:
Pyridine is an aromatic organic compound whose ring structure is composed of five carbon atoms and one nitrogen atom, making it a classic heterocyclic compound.
Q. 96. Which of the following help in the synthesis of proteins from amino acids?
(A) Mitochondria
(B) Golgi bodies
(C) Plastids
(D) Ribosomes
Answer:
(D) Ribosomes
Explanation:
Ribosomes are the biological macromolecular machines in cells that function as the primary site of biological protein synthesis (translation) by linking amino acids together.
Q. 97. What is mushroom?
(A) Fungi
(B) Bacteria
(C) Plant
(D) Virus
Answer:
(A) Fungi
Explanation:
A mushroom is the fleshy, spore-bearing fruiting body of a fungus. It belongs to the kingdom Fungi, entirely distinct from plants or bacteria.
Q. 98. An essential need for germination of seed is the presence of
(A) Minerals
(B) Water
(C) Light
(D) Temperature
Answer:
(B) Water
Explanation:
Water is the most fundamental essential requirement for seed germination; it activates crucial hydrolytic enzymes that break down stored food resources to fuel early embryo growth.
Q. 99. During Photosynthesis, plants make use of sunlight to convert water and carbon dioxide to:
(A) Carbohydrates
(B) Proteins
(C) Hydrogen
(D) Enzymes
Answer:
(A) Carbohydrates
Explanation:
Photosynthesis uses the energy of sunlight to synthesize glucose (a simple carbohydrate) and oxygen from carbon dioxide and water.
Q. 100. What is the carrier of the disease malaria?
(A) Sand fly
(B) Aedes Mosquito
(C) Culex Mosquito
(D) Anopheles Female Mosquito
Answer:
(D) Anopheles Female Mosquito
Explanation:
Malaria is an infectious disease caused by Plasmodium parasites, which are transmitted exclusively through the bites of infected female Anopheles mosquitoes.
