MDCAT Physics Chapter 4 Waves Online Test With Answers

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MDCAT Physics Chapter 4 Waves Online Test

Sr. # Questions Answers Choice
1 The wavelength of light observed on the earth, form a moving star is found todecrease by 0.05%. Relative to the earth the star is moving away with a velocity of 1.5 x 10<sup>5</sup>m/s moving away with a velocity of 1.5 x 10<sup>4</sup>m/s coming closer with a velocity of 1.5 x 10<sup>5</sup>m/s <div>coming closer with a velocity of 1.5 x 10<sup>4</sup>m/s</div>
2 The frequency of the fundamental mode of open at one organ pipe is 400 Hz. Ifone end of pipe is closed the fundamental frequency will be 800 Hz 600 Hz 400 Hz 200 Hz
3 A closed organ pipe and an open organ pipe have their first overtone identical infrequency. Their lengths are in ratio 3:4 1:2 2:3 3:5
4
When passes from medium to another, deviate from its path is called
 reflection <div>refraction</div> diffraction transmission
5 A whistle is revolved with high speed in a horizontal circle of radius R. to an observer at the centre of the circle the frequency of the whistle will appear to be: Decreasing Increasing Both Constant
6
The fundamental frequency in a stretched string is 10 Hz. To double the frequency, the tension in it must be changed to:

 T<sub>2</sub> = 2T<sub>1</sub> T<sub>2</sub> = 4T<sub>1</sub> T<sub>2</sub> = T<sub>1</sub> none of these
7
The frequency of an open pipe is f. if one end is closed then its fundamental frequencywill be:
 f/2 3f/4 f 2f
8 Where in standing wave, do the vibrations of the medium occur? Only at the nodes Only at the antinodes At all points between the nodes At all points between the antinodes
9 A sonar depth finder in a boat uses sound signals to determine the depth of water. Fourseconds after the sound leaves the boat it returns to the boat because of reflection fromthe bottom. Assume the speed of sound in water is 1,460 meters per second. The depth of the water is, in meters, : 2,200 4,800 4,400 2,920
10
A string vibrates in 1 loop has frequency 25 Hz if it moves in 2 loops its frequencywould be:
 25 Hz 50 Hz 12.5 Hz 5Hz
11 A progressive sound wave is a means of transferring energy. A progressive sound waveof constant frequency is generated in air. The intensity of energy transfer is directlyproportional to another of the wave parameters. Which of the following is correct? <div>Intensity 𝖺 (𝑎𝑚𝑝𝑙𝑖𝑡𝑢𝑑𝑒)<sup>2</sup></div> <div>Intensity 𝖺 (𝑝𝑒𝑟𝑖𝑜𝑑𝑖𝑐 𝑡𝑖𝑚𝑒)<sup>2</sup></div> <div>Intensity 𝖺 (𝑠𝑝𝑒𝑒𝑑)<sup>2</sup></div> <div>Intensity 𝖺 (𝑤𝑎𝑣𝑒𝑙𝑒𝑛𝑔𝑡ℎ)<sup>2</sup></div>
12 If a transverse wave has a speed of 10 m/ sec and frequency of 10 cycle/ sec itswavelength is: 1 m 10<sup>-2</sup> cm 10 m 10 cm
13 An organ pipe open at both ends and another organ pipe, closed at one end willresonate with each other, if their lengths are in ration of 1:1 1:4 2:1 1:2
14 The fundamental frequency of a closed organ pope is 50 Hz. The frequency ofsecond over tone is 100hz 150hz 60hz 250hz
15 A sonometer wire 100 cm in length has a fundamental frequency of 330 Hz. Thevelocity of propagation of waves along the wire is 115m/sec 115m/sec 660m/sec 990m/sec
16 A particular wavelength received from a galaxy is measured on earth and isfound to be 5% more than that its wave length on earth. Hence galaxy is Moving towards earth Going away from earth Stationary with respect to earth None
17 A stationary wave is established in a string which vibrates in four segments at afrequency of 120 Hz. Its fundamental frequency is: 15Hz 60Hz 30Hz 430Hz
18 In which of the following, Doppler’s effect is not applicable? To find speed of satellite To find objects under water To find speed of star To tune a musical instrument
19 Bats navigate and find food by: Ultrasonic Echolocation Refraction
20 A church organ consist of open ended pipes ranging from 4m to 4 mm, if the speed ofsound is considered as 400 m/s then the min and max frequency is: 400 Hz and 4 kHz 100 Hz and 100 kHz 50 Hz and 50kHz 400 Hz and 400 kHz
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