Beta rays emitted by a radioactive material are
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(a) Electromagnetic radiation |
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(b) The electrons orbiting around the nucleus |
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(c) Charged particles emitted by nucleus |
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(d) Neutral particles |
(c) Charged particles emitted by nucleus
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If n drops, each of capacitance C, coalesce to form a single big drop, then the ratio of the energy stored in the big drop to that in each small drop will be
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(a) n : 1 |
(b) n1/3 : 1 |
(c) n5/3 : 1 |
(d) n2 : 1 |
Assertion : The presence of water molecules makes separation of ions easier in electrolyte.
Reason : The presence of water molecules in electrolyte decreases the resistance of electrolyte.
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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. |
The photoelectric threshold wavelength for potassium (work function being 2eV ) is
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(a) 310 nm |
(b) 620 nm |
(c) 1200 nm |
(d) 2100 nm |
The transition from the state n = 4 to n = 3 in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition
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(a) 2 → 1 |
(b) 3 → 2 |
(c) 4 → 2 |
(d) 5 → 4 |
The direction of magnetic lines of forces close to a straight conductor carrying current will be
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(a) Along the length of the conductor |
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(a) Along the length of the conductor |
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(c) Circular in a plane perpendicular to the conductor |
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(d) Helical |
The distance between the body centred atom and a corner atom in sodium (a = 4.225 Å) is
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(a) 3.66 Å |
(b) 3.17 Å |
(c) 2.99 Å |
(d) 2.54 Å |
One plate of parallel plate capacitor is smaller than other, then charge on smaller plate will be
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(a) Less than other |
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(b) More than other |
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(c) Equal to other |
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(d) Will depend upon the medium between them |
Assertion : Through the same current flows through the line wires and the filament of the bulb but heat produced in the filament is much higher then that in line wires.
Reason : The filament of bulbs is made of a material of high resistance and high melting point.
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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. |