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In 1 m long open pipe, what is the harmonic of resonance obtained with a tuning fork of frequency 480 Hz?

a) First b) Second c) Third d) Fourth Answer: c) Third Solution: Frequency of Nth harmonic, n = NV/2l v =... View Article

Intensity level of sound whose intensity is 10^-8 Wm^-2 is ______ dB

a) 80 dB b) 8 dB c) 4 dB d) 40 dB Answer: d) 40 dB Solution: I = 10-8 Wm-2 Reference intensity... View Article

The equation of a simple harmonic wave is given by y = 6sin 2π (2t – 0.1x), where x and y are in mm and t is in second. The phase difference between two particles 2 mm apart at any instant is

a) 18° b) 36° c) 54° d) 72° Answer: d) 72° Solution: Given equation can be written as y=6sin(4πt−0.2πx) Phase ϕ=−0.2πx⇒... View Article

If V_m is the velocity of sound in moist air, V_d is the velocity of sound in dry air, under identical conditions of pressure and temperature

a) Vm < Vd b) Vm > Vd c) VmVd = 1 d) Vm = Vd Answer: b) Vm > Vd Solution:... View Article

The ratio of velocity of sound in oxygen to that in hydrogen at same temperature and pressure is approximately

a) 16 : 1 b) 1 : 16 c) 4 : 1 d) 1 : 4 Answer: d) 1 : 4... View Article

If sound wave travel from air to water, which of the following remains unchanged?

a) Velocity b) Wavelength c) Frequency d) Intensity Answer: c) Frequency Solution: We know that frequency is independent of refraction, therefore... View Article

Compressional wave pulses are sent to the bottom of sea from a ship and the echo is heard after 2 s. If bulk modulus of elasticity of water is 2 × 10⁹ Nm^-2 and mean temperature is 4°C, then the depth of the sea will be

a) 1014 m b) 1414 m c) 2828 m d) 1825 m Answer: b) 1414 m Solution: The speed of sound... View Article

A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is

a) 9 : 4 b) 2 : 3 c) 3 : 2 d) 4 : 9 Answer: a) 9 : 4... View Article

Two Cu wires of radii R₁ and R₂, such that (R₁ > R₂ ). Then which of the following is true?

1) Transverse wave travels faster in thicker wire 2) Transverse wave travels faster in thinner wire 3) Travels with the... View Article

A string of density 7.5 g cm^-3 and area of cross-section 0.2 mm² is stretched under a tension of 20 N. When it is plucked at the mid-point, the speed of the transverse wave on the wire is

a) 116 ms-1 b) 40 ms-1 c) 200 ms-1 d) 80 ms-1 Answer: a) 116 ms-1 Solution: v = √(T/μ) T =... View Article

A sonometer wire of length 1.5 m is made of steel. The tension in it produces an elastic strain of 1%. What is the fundamental frequency of steel if the density and elasticity of steel are 7.7 × 10³ kg / m³ and 2.2 × 10¹¹ N / m² respectively?

a) 188.5 Hz b) 178.2 Hz c) 200.5 Hz d) 770 Hz Answer: b) 178.2 Hz Solution: Frequency, f = v/2l... View Article

A string of mass 3 kg is under the tension of 400 N. The length of the stretched string is 25 cm. If the transverse jerk is stuck at one end of the string, how long does the disturbance take to reach the other end?

a) 0.043 s b) 0.055 s c) 0.034 s d) 0.065 s Answer: a) 0.043 s Solution: L = 25 cm... View Article

Which quantity is transmitted with the propagation of longitudinal waves through a medium?

a) Dispersion b) Energy c) Matter d) Frequency Answer: b) Energy Solution: Energy is transferred with the propagation of the longitudinal... View Article

A metallic wire of 1 m length has a mass of 10 × 10^-3 kg. If the tension of 100 N is applied to a wire, what is the speed of the transverse wave?

a) 100 m/s b) 10 m/s c) 200 m/s d) 0.1 m/s Answer: a) 100 m/s Solution: length, l = 1... View Article

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