Which statement about alpha decay is correct?

The correct answer is A: An alpha particle is a helium nucleus with 2 protons and 2 neutrons. An alpha particle is a helium-4 nucleus (₂He⁴) with 2 protons and 2 neutrons. Alpha decay decreases atomic number by 2 and mass number by 4. Alpha particles have low penetration power.

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.

Mycorrhizal associations in plants primarily enhance the uptake of which nutrients?

The correct answer is B: Phosphorus and micronutrients. Arbuscular mycorrhizal fungi increase plant access to phosphorus and micronutrients (Zn, Cu) through their extensive hyphal networks in soil.

The osmotic potential of a solution is directly related to:

The correct answer is B: Solute concentration and temperature. Osmotic potential (Ψs) = -iCRT, where it depends on solute concentration (C) and absolute temperature (T).

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74 Q 8 Topics Take Mock Test

Difficulty: All Easy Medium Hard 71–74 of 74

Topics in General Science

All Physics 106 Chemistry 9 Biology 2 Botany 78 Human Body 4 Disease & Health 2 Space & Astronomy 5 Environment 1

Q.71 Easy Human Body

Organ that pumps blood?

A Liver

B Kidney

C Heart

D Lungs

Correct Answer: C. Heart

EXPLANATION

Heart pumps blood.

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Q.72 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.73 Easy Space & Astronomy Space Science

Which celestial phenomenon occurs when the Moon passes between the Earth and the Sun, blocking the Sun's light and casting a shadow on Earth?

A Solar Eclipse

B Lunar Eclipse

C Penumbral Eclipse

D Annular Eclipse

Correct Answer: A. Solar Eclipse

EXPLANATION

A solar eclipse happens when the Moon's orbit places it directly between Earth and the Sun, creating a shadow on Earth's surface.

This is distinct from a lunar eclipse where Earth blocks sunlight from reaching the Moon, and from penumbral or annular eclipses which are specific types with different characteristics.

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Q.74 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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