NPK fertilizer supplies which primary nutrients? MCQ with Answer and Explanation

NPK fertilizer supplies which primary nutrients?
A. Nitrogen, Phosphorus, Potassium
B. Nitrogen, Phosphorus, Calcium
C. Nitrogen, Potassium, Calcium
D. Sodium, Phosphorus, Potassium
Answer: Option A
Solution (By JKSSB Mock Tests)
NPK stands for Nitrogen (N), Phosphorus (P), and Potassium (K), the three primary macronutrients essential for plant growth. N promotes leaf growth, P aids root and flower development, K supports overall health. Fertilizer labels like 10-26-26 indicate the percentages of N, P₂O₅, and K₂O respectively. Calcium, magnesium, and sulfur are secondary nutrients, while Fe, Mn, Zn etc. are micronutrients.

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Practice More chemistry Questions

Question #1
The force that holds nucleons together in the nucleus is:
A. Strong nuclear force
B. Electrostatic force
C. Gravitational force
D. Van der Waals force

Correct Answer: Option A


Explanation:
The strong nuclear force is the attractive force that binds protons and neutrons (nucleons) together in the nucleus, overcoming the electrostatic repulsion between protons. It is short-range and charge-independent. Electrostatic repulsion would otherwise blow the nucleus apart. Gravitational force is negligible at this scale. Van der Waals forces operate between molecules.

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Question #2
Which allotrope of carbon is the hardest natural substance?
A. Coal
B. Lamp black
C. Graphite
D. Diamond

Correct Answer: Option D


Explanation:
Diamond is the hardest known natural material due to its rigid three-dimensional network of covalent bonds with sp³ hybridization, forming a tetrahedral structure. Graphite is soft and slippery because of its layered structure with weak van der Waals forces between layers. Coal is an amorphous form of carbon. Diamond is used in cutting, drilling, and jewelry. Mohs hardness of diamond is 10.

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Question #3
Which of the following does NOT involve a chemical change?
A. Souring of milk
B. Evaporation of water
C. Making curd from milk
D. Fermentation of grapes

Correct Answer: Option B


Explanation:
Evaporation of water is a physical change—liquid water changes to water vapor, but the chemical composition (H₂O) remains unchanged. Souring of milk and curd formation involve lactic acid bacteria converting lactose to lactic acid (chemical change). Fermentation of grapes involves yeast converting sugars to ethanol and CO₂. Chemical changes produce new substances. Physical changes only alter the state or form.

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