- Aa low resistor is needed to join in parallel
- Ba low resistor is needed to join in series
- Ca high resistor is needed to join in parallel
- ✓a high resistor is needed to join in series
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Assertion : Thin films such as soap bubble or a thin layer of oil on water show beautiful colours when illuminated by white light.
Reason : It happens due to the interference of light reflected from the upper surface of the thin film.
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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. |
Biological importance of Ozone layer is
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(a) It stops ultraviolet rays |
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(b) Ozone rays reduce green house effect |
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(c) Ozone layer reflects radio waves |
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(d) Ozone layer controls |
If light travels a distance x in sec in air and 10 x distance in
sec in a medium, the critical angle of the medium will be
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(a) |
(b) |
(c) |
(d) |
Assertion : The force of repulsion between atomic nucleus and a-particle varies with distance according to inverse square law.
Reason : Rutherford did a-particle scattering experiment.
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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. |