1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A plot of kinetic energy of emitted photoelectrons from a metal versus the frequency of incident radiation gives a straight line, the intercept of which

A. Depends on the nature of the metal used

B. Depends on the intensity of radiation

C. Depends both on the intensity and the nature of metal used

D. Is a constant and is same for all metals which is independent of the intensity of Incident radiation

A
A
B
D
C
B
D
C
2
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
3
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
$4 \times 10^{-2} \mathrm{~m}^2$
4
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
$-F$
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