The root pressure phenomenon in plants can be measured using a device called:

The correct answer is C: Manometer. Root pressure is measured using a manometer connected to the cut end of a plant stem, showing the positive pressure generated by roots.

Which element is essential for the synthesis of chlorophyll molecule and forms the central atom in its structure?

The correct answer is B: Magnesium. Magnesium (Mg) is the central atom in the chlorophyll molecule, forming a coordinate bond with the porphyrin ring.

Which of the following elements has an electronic configuration of 2, 8, 7?

The correct answer is A: Chlorine. Chlorine (Cl) has atomic number 17, with electronic configuration 2, 8, 7 (K-shell: 2, L-shell: 8, M-shell: 7).

What is the atomic mass unit (amu) equivalent to in kg?

The correct answer is A: 1.66 × 10⁻²⁷ kg. 1 amu = 1.66054 × 10⁻²⁷ kg. This is used to express atomic and molecular masses.

Which phenomenon explains the formation of a rainbow?

The correct answer is A: Refraction and dispersion. Rainbows form due to refraction of sunlight entering water droplets and dispersion of different wavelengths

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5 Q 8 Topics Take Mock Test

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Q.1 Easy Chemistry

Hardest natural substance?

A Gold

B Iron

C Diamond

D Quartz

Correct Answer: C. Diamond

EXPLANATION

Diamond = 10 on Mohs scale.

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Q.2 Easy Chemistry

Liquid to gas process?

A Condensation

B Precipitation

C Evaporation

D Sublimation

Correct Answer: C. Evaporation

EXPLANATION

Evaporation = liquid to gas.

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Q.3 Easy Chemistry

Atomic number of Carbon?

A 6

B 8

C 12

D 14

Correct Answer: A. 6

EXPLANATION

Carbon atomic number = 6.

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Q.4 Easy Chemistry

Chemical formula of water?

A HO

B H2O

C H2O2

D HO2

Correct Answer: B. H2O

EXPLANATION

Water = H₂O.

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Q.5 Easy Chemistry

Which of the following elements has the highest electronegativity value on the Pauling scale?

A Fluorine

B Oxygen

C Chlorine

D Nitrogen

Correct Answer: A. Fluorine

EXPLANATION

Fluorine has the highest electronegativity value of 3.98 on the Pauling scale, making it the most electronegative element.

This is because it has the smallest atomic radius and the highest effective nuclear charge among all elements, causing it to attract electrons most strongly in a chemical bond.

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