Physics - Study Mode

[#151] Ultrasound devices operate with minimum frequency from
Correct Answer

(A) 20kHz

Explanation

Solution: Ultrasound devices operate with minimum frequency from 20kHz.

[#152] Which of the following is not a transverse wave?
Correct Answer

(C) Sound waves

Explanation

Solution: Light and Radio waves are both different frequency/wavelengths of electromagnetic radiation, which consists of two components electric and magnetic of perpendicular, transverse waves. Sound, on the other hand, is a longitudinal wave which oscillates parallel to it's medium (back and forth instead of up and down).

[#153] What is the name of the device used to convert alternating current into direct current ?
Correct Answer

(C) Rectifier

Explanation

Solution: Rectifier is the name of the device used to convert alternating current into direct current.

[#154] A Step-Up transformer increases
Correct Answer

(D) Voltage

Explanation

Solution: A Step-Up transformer increases voltage.

[#155] A transformer
Correct Answer

(B) Is used to decrease or increase AC voltage

Explanation

Solution: A transformer is used to decrease or increase AC voltage.