1
MHT CET (PCB) 2025 9th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

Two identical photocathodes receive light of frequencies ' $f 1$ ' and ' $f_2$ '. The velocity of the photoelectrons of mass ' $m$ ' emitted are respectively ' $\mathrm{v}_1$ ' and ' $\mathrm{v}_2$ '. Then the correct relation is ( $\mathrm{h}=$ Planck's constant)

A

$\quad v_1-v_2=\left[\frac{2 h}{m}\left(f_1-f_2\right)\right]^{\frac{1}{2}}$

B

$\quad v_1+v_2=\left[\frac{2 h}{m}\left(f_1+f_2\right)\right]^{\frac{1}{2}}$

C

$v_1^2-v_2^2=\frac{2 h}{m}\left(f_1-f_2\right)$

D

$v_1^2+v_2^2=\frac{2 h}{m}\left(f_1+f_2\right)$

2
MHT CET (PCB) 2025 9th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

The capacitive reactance of a capacitor connected to 50 V d.c. is

A

zero.

B

$10 \Omega$.

C

$50 \Omega$.

D

infinity.

3
MHT CET (PCB) 2025 9th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

A particle performs S.H.M. with amplitude 'A'. The speed of the particle is $\left(\frac{1}{3}\right)^{\text {rd }}$ of the maximum speed when its displacement from the mean position is

A

$\frac{\mathrm{A}}{3}$

B

$\frac{\sqrt{2} \mathrm{~A}}{3}$

C

$\frac{2 \sqrt{2} \mathrm{~A}}{3}$

D

$\frac{2 \mathrm{~A}}{3}$

4
MHT CET (PCB) 2025 9th April Evening Shift
MCQ (Single Correct Answer)
+1
-0

In the Bohr model of hydrogen atom, out of the following quantities, the principal quantum number is proportional to ( $\mathrm{R}, \mathrm{V}$ and E represent radius of the orbit, speed of electron and total energy of the electron respectively)

A

$\frac{\mathrm{V}}{\mathrm{R}}$

B

VR

C

$\frac{E}{V}$

D

$\frac{E}{R}$