1
JEE Main 2025 (Online) 3rd April Evening Shift
MCQ (Single Correct Answer)
+4
-1
A motor operating on 100 V draws a current of 1 A . If the efficiency of the motor is $91.6 \%$, then the loss of power in units of $\mathrm{cal} / \mathrm{s}$ is
A
6.2
B
2
C
8.4
D
4
2
JEE Main 2025 (Online) 3rd April Evening Shift
MCQ (Single Correct Answer)
+4
-1

In the resonance experiment, two air columns (closed at one end) of 100 cm and 120 cm long, give 15 beats per second when each one is sounding in the respective fundamental modes. The velocity of sound in the air column is:

A
$370 \mathrm{~m} / \mathrm{s}$
B
$340 \mathrm{~m} / \mathrm{s}$
C
$335 \mathrm{~m} / \mathrm{s}$
D
$360 \mathrm{~m} / \mathrm{s}$
3
JEE Main 2025 (Online) 3rd April Evening Shift
MCQ (Single Correct Answer)
+4
-1

A block of mass 1 kg , moving along $x$ with speed $v_i=10 \mathrm{~m} / \mathrm{s}$ enters a rough region ranging from $x=0.1 \mathrm{~m}$ to $x=1.9 \mathrm{~m}$. The retarding force acting on the block in this range is $\mathrm{F}_{\mathrm{r}}=-\mathrm{kr} \mathrm{N}$, with k $=10 \mathrm{~N} / \mathrm{m}$. Then the final speed of the block as it crosses rough region is.

A
$4 \mathrm{~m} / \mathrm{s}$
B
$10 \mathrm{~m} / \mathrm{s}$
C
$8 \mathrm{~m} / \mathrm{s}$
D
$6 \mathrm{~m} / \mathrm{s}$
4
JEE Main 2025 (Online) 3rd April Evening Shift
MCQ (Single Correct Answer)
+4
-1

$$ \text {The truth table corresponding to the circuit given below is: } $$

JEE Main 2025 (Online) 3rd April Evening Shift Physics - Semiconductor Question 1 English
A

$$ \begin{array}{|c|c|c|} \hline \mathrm{A} & \mathrm{~B} & \mathrm{C} \\ \hline 0 & 0 & 0 \\ \hline 0 & 1 & 0 \\ \hline 1 & 0 & 1 \\ \hline 1 & 1 & 1 \\ \hline \end{array} $$

B

$$ \begin{array}{|c|c|c|} \hline \text { A } & \mathrm{B} & \mathrm{C} \\ \hline 0 & 0 & 1 \\ \hline 1 & 0 & 0 \\ \hline 0 & 1 & 0 \\ \hline 1 & 1 & 0 \\ \hline \end{array} $$

C

$$ \begin{array}{|c|c|c|} \hline \text { A } & \mathrm{B} & \mathrm{C} \\ \hline 0 & 0 & 1 \\ \hline 0 & 1 & 0 \\ \hline 1 & 0 & 0 \\ \hline 1 & 1 & 0 \\ \hline \end{array} $$

D

$$ \begin{array}{|c|c|c|} \hline \mathrm{A} & \mathrm{~B} & \mathrm{C} \\ \hline 0 & 0 & 0 \\ \hline 1 & 0 & 0 \\ \hline 0 & 1 & 0 \\ \hline 1 & 1 & 1 \\ \hline \end{array} $$

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