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Let’s say we can hear a beat frequency of 2Hz from two tuning forks. The first tuning fork has a frequency of 100Hz. If wax is applied on the 2nd tuning fork, the beat frequency becomes 4Hz, what is the frequency of the 2nd tuning fork?
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.
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.
Which of the following statements is correct regarding secondary seismic waves (S waves)? I. They are also called longitudinal waves. II. These waves cannot pass through liquid materials. III. Their speed is lower than surface waves.
With reference to the interior of the earth consider the following statements. 1] All natural earthquakes take place in the lithosphere. 2] The lithosphere refers to the portion of depth up to 200 km from the surface of the earth. 3] Earthquake waves are basically of four types — body waves, surface waves, rolling waves and shock waves. Which of the statements given above is / are correct?
With reference to secondary seismic waves (S waves) which of the following statements are correct? I. These are also called longitudinal waves. II. These waves cannot pass through liquids. III. Their speed is less than surface waves.
Consider the following pairs: 1. Difference between total float and free float: Interfering float 2. Sum of independent float and tail slack: Free float 3. Sum of independent float, tail slack, and interfering float: Total float Which of these pairs are correctly matched?
Necessary condition for obtaining an interference pattern when light waves (of same frequency) from two points S1 and S2 superpose is:   Intensity of two waves Phase difference between the two waves at S1 and S2 must be 1) Must be equal Zero 2) Must be equal π  3) Must be equal Constant with time but not necessarily zero 4) Need not be equal Constant with time but not necessarily zero
Consider the following statements about Gravitational Waves: 1. Albert Einstein predicted the existence of gravitational waves in 1916 in his general theory of relativity. 2. The gravitational waves can work as sirens to measure the expansion rate of the universe and to understand the origin and the future of the universe. 3. In 2015, LIGO physically sensed the distortions in spacetime caused by passing gravitational waves generated by two colliding black holes nearly 1.3 billion light-years away Which of the statements given above is/are correct?