1
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
2
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

An AC circuit contains resistance of $12 \Omega$ and inductive reactance $5 \Omega$. The phase angle between current and potential difference will be

A
$\sin ^{-1}\left(\frac{12}{13}\right)$
B
$\cos ^{-1}\left(\frac{5}{12}\right)$
C
$\sin ^{-1}\left(\frac{5}{12}\right)$
D
$\cos ^{-1}\left(\frac{12}{13}\right)$
3
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

In an intrinsic semiconductor, at an ordinary temperature, the correct relation between the number of electrons per unit volume $n_e$ and number of holes per unit volume $n_h$.

A
$n_e=n_n$
B
$n_e>n_n$
C
$n_e< n_h$
D
$n_e=n_h=0$
4
MHT CET 2020 19th October Evening Shift
MCQ (Single Correct Answer)
+1
-0

By increasing the aperture of the objective lens, wavelength of light, focal length of the objective lens and the resolving power of an astronomical telescope respectively

A
is not affected, increases, increases
B
decreases, increases, is not affected
C
increases, decreases, is not affected
D
is not affected, increases, decreases
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