93.
Match the following-
(Electromagnetic Waves) (Uses)
(P) Radio waves - (i) Remote switch of household electronic
(Q) Micro waves - (ii) Radar system used in aircraft
(R) Navigation Infrared Rays - (iii) Cellular Phones
(S) Gamma rays in cancer - (iv) Medicine to destroy cells

94.
Which of the following statements is true about the speed of sound in different mediums at 25°C?
A. Speed of sound in steel is 5960 km/s.
B. The speed of sound in nickel is 6040 m/s.

100.
Match the columns.
List-I List-II
a. Audible waves 1. below 20 Hz
b. Infrasonic waves 2. 20 Hz to 20,000 Hz
c. Ultrasonic waves 3. above 20,000 Hz

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