1
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

In the normal adjustment of an astronomical telescope, the objective and eyepiece are $$32 \mathrm{~cm}$$ apart. If the magnifying power of the telescope is 7, find the focal lengths of the objective and eyepiece.

A
$$\mathrm{f}_{\mathrm{o}}=7 \mathrm{~cm}$$ and $$\mathrm{f}_{\mathrm{e}}=28 \mathrm{~cm}$$
B
$$f_o=28 \mathrm{~cm}$$ and $$f_e=7 \mathrm{~cm}$$
C
$$\mathrm{f}_{\mathrm{e}}=28 \mathrm{~cm}$$ and $$\mathrm{f}_{\mathrm{o}}=4 \mathrm{~cm}$$
D
$$f_o=28 \mathrm{~cm}$$ and $$f_e=4 \mathrm{~cm}$$
2
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

In a given semiconductor, the ratio of the number density of electron to number density of hole is $$2: 1$$. If $$\frac{1}{7}$$th of the total current is due to the hole and the remaining is due to the electrons, the ratio of the drift velocity of holes to the drift velocity of electrons is :

A
$$\frac{2}{3}$$
B
$$\frac{3}{1}$$
C
$$\frac{3}{2}$$
D
$$\frac{1}{3}$$
3
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

If $$\mathrm{A}$$ is the areal velocity of a planet of mass $$\mathrm{M}$$, then its angular momentum is

A
$$\frac{\mathrm{MA}}{2}$$
B
MA
C
$$2 \mathrm{MA}$$
D
$$\frac{\mathrm{MA}}{3}$$
4
COMEDK 2024 Morning Shift
MCQ (Single Correct Answer)
+1
-0

When a particular wave length of light is used the focal length of a convex mirror is found to be $$10 \mathrm{~cm}$$. If the wave length of the incident light is doubled keeping the area of the mirror constant, the focal length of the mirror will be:

A
5 cm
B
20 cm
C
15 cm
D
10 cm
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