91. The speed of a body that has mach number more than 1 is
92. A wave has a frequency of 50 Hz and a speed of 36m/s. What is the wavelength of this wave?
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
| (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.
A. Speed of sound in steel is 5960 km/s.
B. The speed of sound in nickel is 6040 m/s.
95. Which of the following represents the decibel level of rustling of tree leaves in normal circumstance?
96. By which a sound is reflected from a distance of at least 17m (approx) . . . . . . . . happens.
97. The sensation of sound persists in the human brain for about:
98. Which one of the following animals can hear ultrasonic sound?
99. Which colour has the shortest wavelength?
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
| 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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