The frequency of ultrasonic wave is MCQ with Answer and Explanation

Question Report Error

The frequency of ultrasonic wave is

A. < 20 Hz

B. 20 Hz - 20 kHz

C. > 20 MHz

D. > 20 kHz

Answer: Option D

Solution (By JKExamLibrary)

Above 20 kHz.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The SI unit of luminous intensity is

A. Watt

B. Candela

C. Lumen

D. Lux

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Correct Answer: Option B

Explanation:
Candela (cd) is one of the seven SI base units, measures luminous intensity. Lumen is luminous flux (lm = cd·sr). Lux is illuminance (lx = lm/m²). Watt is power.

This question belongs to: Science Physics

Question #2 Report Error

Conservative force work over closed path:

A. Negative

B. Positive

C. Zero

D. Path dependent

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Correct Answer: Option C

Explanation:
Conservative forces (gravity, spring): work path-independent ⇒ ∮F·dr = 0 over closed loop. Enables potential energy definition. Memory aid: 'Conservative: ∮F·dr = 0; enables energy conservation'. Mechanics foundation frequently tested in competitive exams.

This question belongs to: Science Physics