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Standing waves are produced in 10m long stretched string. If the string vibrates in 5 segments and wave velocity in 20m/s, the frequency is?
In an NCC parade of a school, seven students P, Q, R, S, T, U, and V are standing in a row. V is standing between P and T. One student is standing between U and P. There are two students standing between R and T who is standing at the left of P. S is standing at the immediate right of U. There are three students between R and Q. Who is standing third from the left end of the row?
Seven people P, Q, R, S, T, U and V are standing in a queue. The number of people standing in front of P and V is same as the number of people standing behind R and S respectively. Three people are standing between Q and U. Q is standing behind P, but ahead of T. Who is standing at the rear end of the queue?
In the following question, the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct. 1. Earthquakes are the shaking and moving of the ground when energy is released in waves.   P. These waves are similar to ocean waves, which move through water. Q. These waves are called seismic waves.  R. Seismic waves, however, move through the ground. S. Earthquakes can also be caused by other natural events, such as landslides and volcanoes.  6. Manmade earthquakes happen because of nuclear testing and mining explosions.
Eight robots – J, K, L, M, N, O, P and Q are standing around a circular tree facing outside. K is fifth to the right of Q which is standing opposite to N. there is K standing between N and M. M is standing opposite to L which is standing to the immediate right of J. O is standing third to the right of N. Which of the following statement is true?
Five people are standing in a row. Aman is standing next to Karan who is not adjacent to Tanuj. Radhika is standing next to Priyanka who is standing on the extreme left and Tanuj is not standing next to Radhika. Who is Standing adjacent to Aman?
Five students are standing in a line. Suman is standing next to Pranav but not next to Deena. Kumar is standing next to Raju, who is standing on the extreme left, and Deena is not standing next to Kumar. Who is standing in the middle?
A metal wire of linear mass density of 9.8/gm is stretched with a tension of 10kg wt between two rigid supports 1m apart. The wire passes at its middle point between the poles of a permanent magnet and it vibrates in resonance, when carrying an alternating current of frequency v. The frequency v of the alternating source is?
Which of the following statements are not true for sound ? (a) Sound waves are transverse waves. (b) Audible sound waves have frequency range of 20 kHz and above. (c) Sound waves require medium for propagation. (d) Non-periodic sound waves are termed as ‘Noise’. 
Which of the following statements is/are correct?   A) Sound waves are transverse waves. B) Audible sound waves have a frequency range of 20 kHz and above. C) Sound waves required a medium for propagation. D) Non-periodic sound waves are term as noise.