1
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

When a ray of light is refracted from one medium to another, then the wavelength changes from $6000 \mathop {\rm{A}}\limits^ \circ$ to $4000 \mathop {\rm{A}}\limits^ \circ$. The critical angle for the interface will be

A
$\cos ^{-1}\left(\frac{3}{2}\right)$
B
$\sin ^{-1}\left(\frac{2}{\sqrt{3}}\right)$
C
$\sin ^{-1}\left(\frac{2}{3}\right)$
D
$\cos ^{-1}\left(\frac{2}{\sqrt{3}}\right)$
2
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

A pipe closed at one end vibrating in fifth overtone is in unison with open pipe vibrating in its fifth overtone. The ratio of $l_{\mathrm{c}}: l_{\mathrm{o}}$ is $\left[l_{\mathrm{c}}=\right.$ vibrating length of closed pipe, $l_0=$ vibrating length of open pipe]

A
$12: 11$
B
$1: 1$
C
$11: 12$
D
$5: 1$
3
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0
Two stars 'A' and 'B' radiate maximum energy at $5200 \mathop {\rm{A}}\limits^ \circ$ and $6500 \mathop {\rm{A}}\limits^ \circ$ respectively. Then the ratio of absolute temperatures of stars ' A ' and ' $B$ ' is $$\mathop {\rm{A}}\limits^ \circ $$
A
$25: 16$
B
$5: 4$
C
$4: 5$
D
$16: 25$
4
MHT CET (PCB) 2024 22th April Morning Shift
MCQ (Single Correct Answer)
+1
-0

A hollow charged metal sphere has a radius ' $r$ '. If the potential difference between its surface and a point at a distance ' 3 r ' from the centre is ' $v$ ', then the electric field intensity at a distance ' $3 r$ ' is

A
$\frac{\mathrm{V}}{2 \mathrm{r}}$
B
$\frac{\mathrm{v}}{3 \mathrm{r}}$
C
$\frac{v}{6 r}$
D
$\frac{\mathrm{v}}{4 \mathrm{r}}$
EXAM MAP