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

Two particles A and B initially at rest, move towards each other under mutual force of attraction. At an instance when the speed of A is v and speed of B is 3v, the speed of centre of mass is :

A
2v
B
zero
C
v
D
4v
2
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

A charge $$\mathrm{Q} ~\mu \mathrm{C}$$ is placed at the centre of a cube. The flux coming out from any one of its faces will be (in SI unit) :

A
$$\frac{Q}{\epsilon_0} \times 10^{-6}$$
B
$$\frac{2 \mathrm{Q}}{3 \epsilon_0} \times 10^{-3}$$
C
$$\frac{\mathrm{Q}}{6 \epsilon_0} \times 10^{-3}$$
D
$$\frac{\mathrm{Q}}{6 \epsilon_0} \times 10^{-6}$$
3
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

The viscous drag acting on a metal sphere of diameter $$1 \mathrm{~mm}$$, falling through a fluid of viscosity $$0.8 \mathrm{~Pa}$$ s with a velocity of $$2 \mathrm{~m} \mathrm{~s}^{-1}$$ is equal to :

A
$$15 \times 10^{-3} \mathrm{~N}$$
B
$$30 \times 10^{-3} \mathrm{~N}$$
C
$$1.5 \times 10^{-3} \mathrm{~N}$$
D
$$20 \times 10^{-3} \mathrm{~N}$$
4
NEET 2023 Manipur
MCQ (Single Correct Answer)
+4
-1
Change Language

If $$\mathrm{R}$$ is the radius of the earth and $$\mathrm{g}$$ is the acceleration due to gravity on the earth surface. Then the mean density of the earth will be :

A
$$\frac{\pi \mathrm{RG}}{12 \mathrm{~g}}$$
B
$$\frac{3 \pi R}{4 g G}$$
C
$$\frac{3 g}{4 \pi R G}$$
D
$$\frac{4 \pi \mathrm{G}}{3 g R}$$
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