Major Competitive Exams
Q. What is the primary function of a transistor?
A.
Rectification
B.
Amplification
C.
Capacitance
D.
Inductance
Show solution
Solution
The primary function of a transistor is amplification of electrical signals.
Correct Answer: B — Amplification
Learn More →
Q. What is the primary function of a transponder in satellite communication?
A.
To amplify the signal
B.
To receive and retransmit signals
C.
To modulate the signal
D.
To filter out noise
Show solution
Solution
A transponder in satellite communication receives signals from the ground, processes them, and retransmits them back to Earth.
Correct Answer: B — To receive and retransmit signals
Learn More →
Q. What is the primary function of an antenna in a communication system?
A.
To amplify the signal
B.
To convert electrical signals into electromagnetic waves
C.
To modulate the signal
D.
To demodulate the signal
Show solution
Solution
An antenna converts electrical signals into electromagnetic waves for transmission and vice versa for reception.
Correct Answer: B — To convert electrical signals into electromagnetic waves
Learn More →
Q. What is the primary function of antacids?
A.
To relieve pain
B.
To reduce acidity
C.
To increase appetite
D.
To promote digestion
Show solution
Solution
Antacids are used to neutralize stomach acidity and relieve heartburn.
Correct Answer: B — To reduce acidity
Learn More →
Q. What is the primary function of antioxidants in food? (2022)
A.
Enhance flavor
B.
Preserve color
C.
Prevent oxidation
D.
Increase sweetness
Show solution
Solution
Antioxidants prevent oxidation, which can lead to spoilage and degradation of food quality.
Correct Answer: C — Prevent oxidation
Learn More →
Q. What is the primary function of antioxidants in the human body? (2020)
A.
Increase energy
B.
Prevent oxidation
C.
Enhance digestion
D.
Boost immunity
Show solution
Solution
Antioxidants prevent oxidation, which can lead to cellular damage and contribute to various diseases.
Correct Answer: B — Prevent oxidation
Learn More →
Q. What is the primary function of auxins in plant growth? (2020)
A.
Promote flowering
B.
Stimulate root growth
C.
Inhibit leaf abscission
D.
Promote cell division
Show solution
Solution
Auxins primarily stimulate root growth and are involved in various growth processes.
Correct Answer: B — Stimulate root growth
Learn More →
Q. What is the primary function of baking soda in cooking?
A.
Thickening agent
B.
Leavening agent
C.
Flavor enhancer
D.
Preservative
Show solution
Solution
Baking soda acts as a leavening agent, helping baked goods rise by producing carbon dioxide when reacting with acids.
Correct Answer: B — Leavening agent
Learn More →
Q. What is the primary function of carbohydrates in living organisms?
A.
Energy storage
B.
Genetic information
C.
Catalysis
D.
Structural support
Show solution
Solution
Carbohydrates primarily serve as a source of energy in living organisms.
Correct Answer: A — Energy storage
Learn More →
Q. What is the primary function of ciliated epithelial cells? (2023)
A.
Absorption
B.
Secretion
C.
Movement of substances
D.
Protection
Show solution
Solution
Ciliated epithelial cells are specialized for the movement of substances across their surface, such as mucus in the respiratory tract.
Correct Answer: C — Movement of substances
Learn More →
Q. What is the primary function of cytokinins in plant growth? (2020)
A.
Promote root growth
B.
Stimulate cell division
C.
Inhibit aging
D.
Enhance fruit ripening
Show solution
Solution
Cytokinins primarily stimulate cell division and are involved in various growth processes.
Correct Answer: B — Stimulate cell division
Learn More →
Q. What is the primary function of emulsifiers in food products?
A.
Thickeners
B.
Stabilizers
C.
Flavor enhancers
D.
Coloring agents
Show solution
Solution
Emulsifiers help stabilize mixtures of oil and water, preventing separation.
Correct Answer: B — Stabilizers
Learn More →
Q. What is the primary function of enzymes in biological systems?
A.
Store energy
B.
Speed up chemical reactions
C.
Provide structural support
D.
Transport molecules
Show solution
Solution
Enzymes act as catalysts to speed up chemical reactions in biological systems.
Correct Answer: B — Speed up chemical reactions
Learn More →
Q. What is the primary function of enzymes?
A.
Store energy
B.
Speed up chemical reactions
C.
Provide structure
D.
Transport substances
Show solution
Solution
Enzymes are biological catalysts that speed up chemical reactions in the body.
Correct Answer: B — Speed up chemical reactions
Learn More →
Q. What is the primary function of fats in the diet?
A.
Energy storage
B.
Muscle building
C.
Bone health
D.
Immune function
Show solution
Solution
Fats primarily serve as energy storage, providing 9 calories per gram.
Correct Answer: A — Energy storage
Learn More →
Q. What is the primary function of fluoride in dental care products?
A.
Whitening teeth
B.
Preventing cavities
C.
Freshening breath
D.
Strengthening gums
Show solution
Solution
Fluoride helps to prevent cavities by strengthening tooth enamel and making it more resistant to decay.
Correct Answer: B — Preventing cavities
Learn More →
Q. What is the primary function of fluoride in dental care?
A.
Whitening teeth
B.
Preventing cavities
C.
Strengthening enamel
D.
Reducing sensitivity
Show solution
Solution
Fluoride helps to strengthen tooth enamel and prevent cavities.
Correct Answer: C — Strengthening enamel
Learn More →
Q. What is the primary function of glucagon? (2023)
A.
Increase blood glucose levels
B.
Decrease blood glucose levels
C.
Stimulate protein synthesis
D.
Inhibit fat breakdown
Show solution
Solution
Glucagon is a hormone that raises blood glucose levels by promoting the conversion of glycogen to glucose in the liver.
Correct Answer: A — Increase blood glucose levels
Learn More →
Q. What is the primary function of hemoglobin in the blood? (2019)
A.
Transport nutrients
B.
Regulate pH
C.
Carry oxygen
D.
Fight infections
Show solution
Solution
Hemoglobin's primary function is to carry oxygen from the lungs to the tissues and return carbon dioxide from the tissues to the lungs.
Correct Answer: C — Carry oxygen
Learn More →
Q. What is the primary function of lipids in biological systems?
A.
Energy storage
B.
Catalysis
C.
Genetic information
D.
Structural support
Show solution
Solution
Lipids serve as a major form of energy storage in organisms.
Correct Answer: A — Energy storage
Learn More →
Q. What is the primary function of lipids in the body? (2021)
A.
Energy storage
B.
Genetic information
C.
Structural support
D.
Transport
Show solution
Solution
Lipids primarily serve as energy storage molecules.
Correct Answer: A — Energy storage
Learn More →
Q. What is the primary function of nervous tissue? (2022)
A.
Support and protection
B.
Movement
C.
Transmission of impulses
D.
Storage of energy
Show solution
Solution
Nervous tissue is responsible for the transmission of electrical impulses throughout the body, facilitating communication.
Correct Answer: C — Transmission of impulses
Learn More →
Q. What is the primary function of parathyroid hormone? (2023)
A.
Increase calcium levels in blood
B.
Decrease calcium levels in blood
C.
Regulate metabolism
D.
Stimulate growth
Show solution
Solution
Parathyroid hormone (PTH) increases calcium levels in the blood by stimulating the release of calcium from bones and increasing calcium absorption in the intestines.
Correct Answer: A — Increase calcium levels in blood
Learn More →
Q. What is the primary function of petals in a flower? (2021)
A.
Support the flower
B.
Attract pollinators
C.
Protect the ovary
D.
Produce nectar
Show solution
Solution
Petals are often brightly colored to attract pollinators.
Correct Answer: B — Attract pollinators
Learn More →
Q. What is the primary function of potassium in plants? (2020)
A.
Photosynthesis
B.
Water regulation
C.
Protein synthesis
D.
Cell division
Show solution
Solution
Potassium plays a crucial role in regulating water balance and osmotic pressure in plant cells.
Correct Answer: B — Water regulation
Learn More →
Q. What is the primary function of preservatives in food?
A.
Enhance flavor
B.
Improve texture
C.
Prevent spoilage
D.
Increase nutritional value
Show solution
Solution
Preservatives are added to food to prevent spoilage caused by microorganisms.
Correct Answer: C — Prevent spoilage
Learn More →
Q. What is the primary function of producers in an ecosystem? (2019)
A.
To consume other organisms
B.
To decompose organic matter
C.
To produce energy through photosynthesis
D.
To compete for resources
Show solution
Solution
Producers, such as plants, produce energy through photosynthesis, forming the base of the food chain.
Correct Answer: C — To produce energy through photosynthesis
Learn More →
Q. What is the primary function of proteins in the body? (2023)
A.
Energy storage
B.
Catalyzing biochemical reactions
C.
Genetic information storage
D.
Cell membrane structure
Show solution
Solution
Proteins act as enzymes that catalyze biochemical reactions.
Correct Answer: B — Catalyzing biochemical reactions
Learn More →
Q. What is the primary function of proteins in the body? (2023) 2023
A.
Energy storage
B.
Catalyzing biochemical reactions
C.
Genetic information storage
D.
Cell membrane structure
Show solution
Solution
Proteins primarily function as enzymes that catalyze biochemical reactions.
Correct Answer: B — Catalyzing biochemical reactions
Learn More →
Q. What is the primary function of RAM in a computer?
A.
Store data permanently
B.
Execute programs
C.
Provide temporary storage
D.
Control peripherals
Show solution
Solution
RAM (Random Access Memory) provides temporary storage for data and programs that are currently in use.
Correct Answer: C — Provide temporary storage
Learn More →
Showing 12151 to 12180 of 17824 (595 Pages)