A soap bubble is given a negative charge, then its radius
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(a) Decreases |
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(b) Increases |
|
(c) Remains unchanged |
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(d) Nothing can be predicted as information is insufficient |
(b) Increases
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In 
solution when electric current equal to 2.5 faraday is passed, the gm equivalent deposited on the cathode is
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(a) 1 |
(b) 1.5 |
(c) 2 |
(d) 2.5 |
Assertion : A double convex lens (m = 1.5) has focal length 10 cm. When the lens is immersed in water (m = 4/3) its focal length becomes 40 cm.
Reason : 
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
$\lambda\geq\lambda_0$
$\lambda\geq2\lambda_0$
$\lambda\leq\lambda_0$
$\lambda<\frac{\lambda_ 0}{2}.$
Assertion : In high latitude one sees colourful curtains of light hanging down from high altitudes.
Reason : The high energy charged particles from the sun are deflected to polar regions by the magnetic field of the earth.
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(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
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(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
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(c) If assertion is true but reason is false. |
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(d) If the assertion and reason both are false. |
What is the time taken (in seconds) to cross a glass of thickness 4 mm and μ = 3 by light
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(a) 4 |
(b) 2 |
(c) 16 |
(d) 8 |
$\frac{1}{2}\text{kx}^2$
$-\frac{1}{2}\text{kx}^2$
$\frac{1}{4}\text{kx}^2$
$-\frac{1}{4}\text{kx}^2$
Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54Å. The value of the lattice constant for this lattice is
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(a) 1.27 Å |
(b) 5.08 Å |
(c) 2.54 Å |
(d) 3.59 Å |
