Question : A wavelength of 0.3 m is produced in air and it travels at a speed of 300m/s. Then, it will be an:
Option 1: Audible Wave
Option 2: Infrasonic Wave
Option 3: Ultrasonic Wave
Option 4: Microwave
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Correct Answer: Audible Wave
Solution : The correct option is the Audible Wave.
The audible range for humans is between 20 Hz and 20,000 Hz. The speed of a wave (v) is related to its wavelength (λ) and frequency (f) by the equation: v=f⋅λ. With a wavelength of 0.3 m and a speed of 300 m/s, the frequency is 1000 Hz, which corresponds to an audible wave.
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Question : In a 140 m race, Pankaj runs at a speed of $\frac{5}{2}$ m/s. He gives a start of 20 m to Arun and still defeats him by 4 seconds. The speed of Arun is:
Option 1: 1.75 m/s
Option 2: 1.25 m/s
Option 3: 2 m/s
Option 4: 1.5 m/s
Question : A train of length 360 m crosses an electric pole in 30 s and crosses another train of the same length travelling in the opposite direction in 15 s. What is the speed of the second train?
Option 1: 12 m/s
Option 2: 36 m/s
Option 3: 24 m/s
Option 4: 60 m/s
Question : A journey takes 4 hours 30 minutes at a speed of 60 km/h. If the speed is 15 m/s, then the journey will take:
Option 1: 5 hours
Option 2: 5 hours 30 minutes
Option 3: 6 hours
Option 4: 6 hours 15 minutes
Question : To cover a distance of 216 km in 3.2 hours, what should be the average speed of a car in meters per second?
Option 1: 67.5 m/s
Option 2: 33.75 m/s
Option 3: 37.5 m/s
Option 4: 18.75 m/s
Question : To cover a distance of 234 km in 1.6 hours, what should be the average speed of the car in metres per second?
Option 1: 40.625 m/s
Option 2: 146.25 m/s
Option 3: 73.125 m/s
Option 4: 81.25 m/s
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