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

Two point charges $$\mathrm{M}$$ and $$\mathrm{N}$$ having charges $$+q$$ and $$-q$$ respectively are placed at a distance apart. Force acting between them is $$\mathrm{F}$$. If $$30 \%$$ of charge of $$\mathrm{N}$$ is transferred to $$\mathrm{M}$$, then the force between the charges becomes:

A
F
B
$$ \frac{100}{49} F $$
C
$$ \frac{49}{100} F $$
D
$$ \frac{9}{16} F $$
2
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

A conducting circular loop is placed in a uniform magnetic field $$\mathrm{B}=0.125 \mathrm{~T}$$ with its plane perpendicular to the loop. If the radius of the loop is made to shrink at a constant rate of $$2 \mathrm{~mm} \mathrm{~s}^{-1}$$, then the induced emf when the radius is $$4 \mathrm{~cm}$$ is

A
$$0.52 \pi \mu V$$
B
$$20 \pi \mu V$$
C
$$\frac{2}{3}\mu V$$
D
$$\frac{3 \pi}{2} \mu V$$
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

Figure below shows a lens of refractive index, $$\mu=1.4$$. $$C_1$$ and $$C_2$$ are the centres of curvature of the two faces of the lens of radii of curvature $$4 \mathrm{~cm}$$ and $$8 \mathrm{~cm}$$ respectively.

COMEDK 2024 Evening Shift Physics - Ray Optics Question 1 English

The lens behaves as a

A
diverging lens of focal length $$20 \mathrm{~cm}$$
B
converging lens of focal length $$20 \mathrm{~cm}$$
C
converging lens of focal length $$12 \mathrm{~cm}$$
D
diverging lens of focal length $$12 \mathrm{~cm}$$
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The temperature of a wire is doubled. The Young's modulus of elasticity

A
Will decrease
B
Will also double
C
Will become four times
D
Will remain the same
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