1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
A plano-convex lens made of refractive index 1.5 and having radius of curvature $\mathrm{R}=4 \mathrm{~cm}$ fits exactly into a planoconcave lens made of refractive index 1.3 and having the same radius of curvature $R=4 \mathrm{~cm}$ such that their plane surfaces are parallel to each other. The focal length of the combination is :
A
5 cm
B
50 cm
C
2 cm
D
20 cm
2
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
The rate of heat conduction in the given two metal rods having the same length is found to be the same when the temperature difference between the ends is kept $30^{\circ} \mathrm{C}$ If the area of cross section of the first rod is $8 \times 10^{-2} \mathrm{~m}^2$ then what will be area of cross section of the second rod? [ Given that the ratio of the thermal conductivity of the first rod to that of the second rod is $1: 4$ ]
A
$2 \times 10^{-2} \mathrm{~m}^2$
B
$4 \times 10^{-4} \mathrm{~m}^2$
C
$2 \times 10^{-4} \mathrm{~m}^2$
D
$4 \times 10^{-2} \mathrm{~m}^2$
3
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A current carrying closed loop in the form of a right isosceles triangle XYZ is placed in a uniform magnetic field $B$ acting along $X Y$ of the loop. If the magnetic force on the arm $Y Z$ is $\sqrt{2} F$, then the force on the arm $X Z$ is:

COMEDK 2025 Evening Shift Physics - Moving Charges and Magnetism Question 1 English

A
$-\sqrt{2} F$
B
$\frac{\mathrm{F}}{\sqrt{2}}$
C
$+2 \sqrt{2} F$
D
$-F$
4
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
A capacitor of capacitance $4 \mu \mathrm{~F}$ is charged to a potential of 24 V and then connected in parallel to an uncharged capacitor of capacitance $6 \mu \mathrm{~F}$. The final potential difference across each capacitor will be:
A
6.9 V
B
8.2 V
C
9.6 V
D
7.4 V
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