The electromagnetic waves with highest frequency are MCQ with Answer and Explanation

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The electromagnetic waves with highest frequency are

A. Ultraviolet

B. Radio waves

C. Gamma rays

D. X-rays

Answer: Option C

Solution (By JKSSB Mock Tests)

Gamma rays >10¹⁹ Hz, highest.

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Practice More Physics Questions

Question #1

Nuclear fusion combines:

A. Light nuclei

B. Heavy nuclei

C. Protons and electrons

D. Neutrons and protons

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Correct Answer: Option A

Explanation:
Fusion: light nuclei (e.g., hydrogen) combine to form heavier nucleus (helium), releasing energy (stars, H-bomb). Fission splits heavy nuclei (U, Pu). Memory tip: 'Fusion = joining light; Fission = splitting heavy'. Nuclear reaction concept frequently tested in competitive modern physics sections.

This question belongs to: Science Physics

Question #2

An engine pumps water continuously through a hose. Water leaves the hose with a velocity 'v' and mass per unit length is 'm'. What is the power imparted to the water?

A. mv^2

B. 1/2 m^2v

C. mv^3

D. 1/2 mv^3

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Correct Answer: Option D

Explanation:
Power is the rate of doing work or imparting kinetic energy (dK/dt). Mass exiting per second = m * v (mass/length * length/time). Kinetic energy imparted per second = 1/2 * (mass per second) * v^2 = 1/2 * (mv) * v^2 = 1/2 * m * v^3. This is a very common advanced mechanics question.

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Question #3

Dispersion occurs because:

A. Prism absorbs colors

B. TIR occurs

C. Different colors have different speeds in medium

D. Different frequencies

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Correct Answer: Option C

Explanation:
n varies with λ ⇒ v = c/n varies ⇒ different refraction angles (Snell's law). Frequency constant; wavelength changes in medium. Memory aid: 'Dispersion: n(λ) ⇒ v(λ) ⇒ different bending; violet bends most'. Optics concept frequently tested in competitive exams.

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