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

The heat required to increase the temperature from 373 K to 573 K at constant volume for ideal monoatomic gas of 2 moles is ( $R=$ universal gas constant)

A

900 R

B

$\quad 300 \mathrm{R}$

C

1200 R

D

600 R

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

Two (A and B) pendulums begin to swing simultaneously. The first pendulum (A) makes five oscillations when the other (B) makes three oscillations. The ratio of the lengths of pendulum $A$ to that of $B$ is

A

$3: 5$

B

$9: 25$

C

$5: 3$

D

$2: 3$

3
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

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

4
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.