1
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two wires of same material of radius 'r' and '2r' respectively are welded together end to end. The combination is then used as a sonometer wire under tension 'T'. The joint is kept midway between the two bridges. The ratio of the number of loops formed in the wires such that the joint is a node is

A
1 : 5
B
1 : 2
C
1 : 4
D
1 : 3
2
MHT CET 2021 20th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

The frequency of a tuning fork is 'n' Hz and velocity of sound in air is 'V' m/s. When the tuning fork completes 'x' vibrations, the distance travelled by the wave is

A
$$\mathrm{\frac{V}{xn}}$$
B
$$\mathrm{\frac{Vn}{x}}$$
C
$$\mathrm{\frac{xV}{n}}$$
D
$$\mathrm{\frac{x}{Vn}}$$
3
MHT CET 2020 16th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

A sonometer wire under suitable tension having specific gravity $$\rho$$, vibrates with frequency $$n$$ in air. If the load is completely immersed in water the frequency of vibration of wire will become

A
$$\left[\frac{\rho-1}{n \rho}\right]^{\frac{1}{2}}$$
B
$$n\left[\frac{\rho-1}{\rho}\right]^{\frac{1}{2}}$$
C
$$n\left[\frac{\rho}{\rho-1}\right]^{\frac{1}{2}}$$
D
$$\left[\frac{n \rho}{\rho-1}\right]^{\frac{1}{2}}$$
4
MHT CET 2020 16th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

An obstacle is moving towards the source with velocity $$v$$. The sound is reflected from the obstacle. If $$c$$ is the speed of sound and $$\lambda$$ is the wavelength, then the wavelength of the reflected wave $$\lambda_r$$ is

A
$$\lambda_r=\left(\frac{c-v}{c+v}\right) \lambda$$
B
$$\lambda_r=\left(\frac{c+v}{c-v}\right) \lambda$$
C
$$\lambda_r=\left(\frac{c-v}{c}\right) \lambda$$
D
$$\lambda_r=\left(\frac{c+v}{c}\right) \lambda$$
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