Ultrasonic waves have frequency MCQ with Answer and Explanation

Ultrasonic waves have frequency
A. Less than 20 Hz
B. 20 Hz to 20 kHz
C. Greater than 20 MHz
D. Greater than 20 kHz
Answer: Option D
Solution (By JKSSB Mock Tests)
Above 20 kHz is ultrasound.

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Practice More Physics Questions

Question #1
The core of a transformer is laminated to reduce
A. Copper loss
B. Hysteresis loss
C. Eddy current loss
D. Flux leakage

Correct Answer: Option C


Explanation:
Lamination of core increases resistance to circulating eddy currents, reducing eddy current losses (I²R). Hysteresis loss reduced by using soft iron. Copper loss is in windings. Lamination is insulation between layers.

This question belongs to: Science Physics
Question #2
The de Broglie wavelength associated with a moving particle is inversely proportional to its:
A. Mass only
B. Momentum
C. Kinetic energy
D. Velocity only

Correct Answer: Option B


Explanation:
Louis de Broglie proposed that matter exhibits wave-like properties. The de Broglie wavelength (lambda) of a particle is given by the formula lambda = h / p, where 'h' is Planck's constant and 'p' is the linear momentum (mass * velocity) of the particle. Therefore, the wavelength is strictly inversely proportional to the momentum of the moving particle.

This question belongs to: Science Physics
Question #3
Which of the following is a derived unit?
A. Candela
B. Newton
C. Second
D. Kilogram

Correct Answer: Option B


Explanation:
Newton = kg·m/s², derived from base units. Kilogram, second, candela are base units. Derived units expressed in terms of base units. Joule, watt, pascal are also derived.

This question belongs to: Science Physics