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1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Which of the following is not true for a perfect conductor?
A
Electric field inside a conductor is zero
B
The electric field just outside a conductor is always perpendicular to the surface.
C
The surface of a conductor is an equipotential surface.
D
The charge carried by a conductor is always uniformly distributed over the surface of the conductor irrespective of the shape of the conductor.
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
Young's modulus of the material of wires X and Y are in the ratio 4:1 and the areas of cross sections of the wires X and Y are in the ratio $2: 1$. If the same amount of load is applied to both the wires, the ratio of elongation produced in the wires X and Y will be: (Assume length of the wires X and Y initially are the same)
A
$1: 8$
B
$1: 1$
C
$8: 1$
D
$1: 2$
3
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The dimension $$[\mathrm{ML}^{-1} \mathrm{~T}^{-2}]$$ is the physical quantity of

A
Pressure $$\times$$ Area
B
$$\mathrm{\frac{Force}{Pressure}}$$
C
Power $$\times$$ Time
D
Energy density
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

If units of mass, length and gravitational constant are chosen to fundamental units, the dimensions of time would be

A
$$ \mathrm{M}^{1 / 2} \mathrm{~L}^{1 / 2} \mathrm{G}^{-1 / 2} $$
B
$$ \mathrm{M}^1 \mathrm{~L}^{1 / 2} \mathrm{G}^2 $$
C
$$ \mathrm{M}^{-1 / 2} \mathrm{~L}^{3 / 2} \mathrm{G}^{-1 / 2} $$
D
$$ \mathrm{M}^{-1} \mathrm{~L}^3 \mathrm{G}^{-1} $$
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