A brass rod of length 1 m at 0°C expands by 0.0019 m when heated to 100°C. Its linear expansion coefficient is MCQ with Answer and Explanation

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A brass rod of length 1 m at 0°C expands by 0.0019 m when heated to 100°C. Its linear expansion coefficient is

A. 1.9 × 10⁻⁶ /°C

B. 1.9 × 10⁻³ /°C

C. 1.9 × 10⁻⁴ /°C

D. 1.9 × 10⁻⁵ /°C

Answer: Option D

Solution (By JKSSB Mock Tests)

ΔL = α L₀ ΔT => α = ΔL/(L₀ ΔT) = 0.0019/(1×100) = 1.9×10⁻⁵ /°C. Typical for brass. Unit is per °C. Always check ΔL/L per °C.

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Dispersion of white light through a prism occurs because

A. Different colours have same speed in glass

B. Prism absorbs colours

C. White light is composed of seven colours

D. Refractive index is different for different colours

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Correct Answer: Option D

Explanation:
Dispersion is splitting of light into constituent colours due to variation of refractive index with wavelength. Violet deviates most, red least. Prism doesn't absorb but disperses. Rainbow formation is due to dispersion, refraction, reflection in water droplets.

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