Sixty-four drops are jointed together to form a bigger drop. If each small drop has a capacitance C, a potential V, and a charge q, then the capacitance of the bigger drop will be(a) C (b) 4C(c) 16C (d) 64C

Sixty-four drops are jointed together to form a bigger drop. If e…

If a magnet is hanged with its magnetic axis then it stops in(a) Magnetic meridian(b) Geometric meridian(c) Angle of dip(d) None of these

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The EM waves when travel into different media gets:

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Four modifications are suggested in the lens formula to include the effect of the thickness t of the lens. Which one is likely to be correct?

$\frac{1}{\text{v}}-\frac{1}{\text{u}}=\frac{1}{\text{uf}}$
$\frac{1}{\text{v}^2}-\frac{1}{\text{u}}=\frac{1}{\text{f}}$
$\frac{1}{\text{v}-\text{t}}-\frac{1}{\text{u}+\text{t}}=\frac{1}{\text{f}}$
$\frac{1}{\text{v}}-\frac{1}{\text{u}}+\frac{\text{t}}{\text{uv}}=\frac{\text{t}}{\text{f}}$

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Rydberg’s constant is:

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A coil having an inductance of 0.5 H carries a current which is uniformly varying from zero to 10 ampere in 2 second. The e.m.f. (in volts) generated in the coil is(a) 10(b) 5 (c) 2.5(d) 1.25

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In the photoeletric effect, electrons are emitted:

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When the current i is flowing through a conductor, the drift velocity is v. If 2i current is flowed through the same metal but having double the area of cross-section, then the drift velocity will be(a) v/4(b) v/2(c) v (d) 4v

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Two light beams superimposed each other constructively this results in$:$

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In order to obtain a real image of magnification 2 using a converging lens of focal length 20 cm, where should an object be placed(a) 50 cm(b) 30 cm(c) – 50 cm(d) – 30 cm

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If a current of $10 A$ flows in one second through a coil, and the induced $\text{e.m.f.}$ is $10 V,$ then the self$-$inductance of the coil is

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