The coefficient of linear expansion of a metal is 1.2 × 10⁻⁵ °C⁻¹. If a 1 m rod is heated from 0°C to 100°C, what is the increase in length?

The correct answer is B: 1.2 mm. Linear expansion: ΔL = α × L₀ × ΔT = 1.2 × 10⁻⁵ × 1 × 100 = 1.2 × 10⁻³ m = 1.2 mm.

Which phenomenon causes the sky to appear blue during daytime?

The correct answer is C: Rayleigh scattering. Blue light has shorter wavelength and is scattered more by atmospheric molecules (Rayleigh scattering)

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 has the lowest refractive index?

The correct answer is C: Air. Air has a refractive index of approximately 1, which is the lowest among common materials

Planet closest to Sun?

The correct answer is B: Mercury. Mercury is closest to Sun.

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Showing 1–2 of 2 questions in Disease & Health

Q.1 Easy Disease & Health

Vitamin produced by sunlight?

A Vitamin A

B Vitamin B12

C Vitamin C

D Vitamin D

Correct Answer: D. Vitamin D

Explanation:

Sunlight → Vitamin D synthesis.

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Q.2 Easy Disease & Health

Vitamin C deficiency causes?

A Rickets

B Scurvy

C Night blindness

D Beriberi

Correct Answer: B. Scurvy

Explanation:

Scurvy from Vitamin C deficiency.

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