1
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

A certain wire $$\mathrm{A}$$ has resistance $$81 ~\Omega$$. The resistance of another wire $$\mathrm{B}$$ of same material and equal length but of diameter thrice the diameter of A will be :

A
$$81 ~\Omega$$
B
$$9 ~\Omega$$
C
$$729 ~\Omega$$
D
$$243 ~\Omega$$
2
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

$$\epsilon_0$$ and $$\mu_0$$ are the electric permittivity and magnetic permeability of free space respectively. If the corresponding quantities of a medium are $$2 ~\epsilon_0$$ and $$1.5 ~\mu_0$$ respectively, the refractive index of the medium will nearly be :

A
$$\sqrt{2}$$
B
$$\sqrt{3}$$
C
3
D
2
3
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

The amount of elastic potential energy per unit volume (in SI unit) of a steel wire of length $$100 \mathrm{~cm}$$ to stretch it by $$1 \mathrm{~mm}$$ is (if Young's modulus of the wire $$=2.0 \times 10^{11} \mathrm{Nm}^{-2}$$ ) :

A
$$10^{11}$$
B
$$10^{17}$$
C
$$10^7$$
D
$$10^5$$
4
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

The $$4^{\text {th }}$$ overtone of a closed organ pipe is same as that of $$3^{\text {rd }}$$ overtone of an open pipe. The ratio of the length of the closed pipe to the length of the open pipe is :

A
8 : 9
B
9 : 7
C
9 : 8
D
7 : 9
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