1
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
In the normal adjustment of an astronomical telescope, the objective and eyepiece are 36 cm apart. If the magnifying power of the telescope is 8 , find the focal lengths of the objective and eyepiece.
A
$\mathrm{F}_{\mathrm{O}}=28 \mathrm{~cm}, \mathrm{Fe}^{\mathrm{e}}=7 \mathrm{~cm}$
B
$\mathrm{F}_0=28 \mathrm{~cm}, \mathrm{~F}_{\mathrm{e}}=4 \mathrm{~cm}$
C
$\mathrm{F}_{\mathrm{o}}=32 \mathrm{~cm}, \mathrm{Fe}^{\mathrm{e}}=4 \mathrm{~cm}$
D
$\mathrm{F}_0=4 \mathrm{~cm}, \mathrm{~F}_{\mathrm{e}}=32 \mathrm{~cm}$
2
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
A rectangular coil of 250 turns has an average area of $20 \mathrm{~cm} \times 15 \mathrm{~cm}$. The coil rotates with a speed of 60 cycles per second in a uniform magnetic field of $2 \times 10^{-2} \mathrm{~T}$ about an axis perpendicular to the field. The peak value of the induced emf is:
A
$36 \pi$ volt
B
$30 \pi$ volt
C
$18 \pi$ volt
D
$12 \pi$ volt
3
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0
A beam of incident parallel light falls on a diverging lens of focal length 20 cm in magnitude. If a converging lens of focal length 15 cm in magnitude is placed at a distance of 10 cm to the right of the diverging lens on the other side, then, the final image formed is:
A
Virtual and is at a distance of 30 cm to the right of the converging lens.
B
Virtual and is at a distance of 40 cm to the right of the diverging lens.
C
Real and is at a distance of 30 cm to the right of the converging lens.
D
Real and is at a distance of 40 cm to the right of the converging lens.
4
COMEDK 2025 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The total number of degrees of freedom associated with $2 \mathrm{~cm}^3$ of Nitrogen gas at normal temperature and pressure is:

[Given Avogadro number as ' N ' ]

A
$\frac{N}{44800}$
B
$\frac{N}{4480}$
C
$\frac{N}{2240}$
D
$\frac{N}{22400}$
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