1
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

A uniform metal wire has length $L$, mass $M$ and density $\rho$. It is under tension $T$ and $v$ is the speed of transverse wave along the wire. The area of cross-section of the wire is

A
$\frac{T}{v^2 \rho}$
B
$\frac{v^2 \rho}{T}$
C
$T^2 \rho V$
D
$T v^2 \rho$
2
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

The fundamental frequency of a closed pipe is 400 Hz . If $\frac{1}{3}$ rd pipe is filled with water, then the frequency of 2nd harmonic of the pipe will be (neglect and correction)

A
1200 Hz
B
1800 Hz
C
600 Hz
D
300 Hz
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
$$\lambda_r=\left(\frac{c+v}{c}\right) \lambda$$
MHT CET Subjects
EXAM MAP