- AWhen the capacitors are connected in series.
- BWhen the capacitors are randomly connected.
- CWhen the capacitors are connected in parallel.
- DWhen the capacitors are connected in series and parallel simultaneously.
Explanation:
The effective capacitance of a capacitor is increased when the capacitors are connected in parallel. When the capacitors are connected in parallel, the equivalent capacitance is given by:
Cp = C1 + C2 + C3 +…….
When the capacitors are connected in parallel, the potential difference across each capacitor is the same.
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Assertion : Short wave bands are used for transmission of radio waves to a large distance.
Reason : Short waves are reflected by ionosphere
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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. |
When air in a capacitor is replaced by a medium of dielectric constant K, the capacity
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(a) Decreases K times |
(b) Increases K times |
(c) Increases |
(d) Remains constant |
According to photon theory of light which of the following physical quantities associated with a photon do not/does not change as it collides with an electron in vacuum
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(a) Energy and momentum |
(b) Speed and momentum |
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(c) Speed only |
(d) Energy only |
A ray of light is incident at an angle of 60° on one face of a prism of angle 30°. The ray emerging out of the prism makes an angle of 30° with the incident ray. The emergent ray is
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(a) Normal to the face through which it emerges |
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(b) Inclined at 30° to the face through which it emerges |
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(c) Inclined at 60° to the face through which it emerges |
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(d) None of these |
The electric field in a region is radially outward with magnitude E = . The charge contained in a sphere of radius
centered at the origin is
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(a) |
(b) |
(c) |
(d) |
Assertion : According to classical theory, the proposed path of an electron in Rutherford atom model will be parabolic.
Reason : According to electromagnetic theory an accelerated particle continuously emits radiation.
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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 assertion is false but reason is true. |