Which law of motion states that the acceleration of an object is directly proportional to the net force applied and inversely proportional to its mass?

The correct answer is B: Newton's Second Law. Newton's Second Law: F = ma, where acceleration is directly proportional to force and inversely proportional to mass.

A spring with spring constant k = 100 N/m is compressed by 0.2 m. What is the elastic potential energy stored?

The correct answer is B: 2 J. Elastic potential energy U = ½kx². U = ½ × 100 × (0.2)² = 50 × 0.04 = 2 J.

The transpiration pull mechanism in xylem transport depends on which principle?

The correct answer is B: Cohesion-tension theory and water's high surface tension. Transpiration creates negative pressure (tension) in xylem; water cohesion allows continuous columns to be pulled upward against gravity.

A Carnot engine operates between temperatures 400 K and 300 K. What is its maximum efficiency?

The correct answer is A: 0.25 or 25%. Carnot efficiency: η = 1 - (T_cold/T_hot) = 1 - (300/400) = 1 - 0.75 = 0.25 = 25%. This is the theoretical maximum for any heat engine.

Which statement about stomata is INCORRECT?

The correct answer is B: Stomata open during night to minimize water loss. Stomata open during the day (when light is available for photosynthesis) and close at night. This reduces water loss during low photosynthetic activity periods.

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Q.1 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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Q.2 Easy Space & Astronomy

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.3 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.4 Easy Human Body