Assertion: In a communication system based on amplitude modulation the modulation index is kept <1.
Reason: It ensures minimum distortion of signal.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: If optical density of a substance is more than that of water then the mass density of substance can be less than water.
Reason: Optical density and mass density are not related.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: is a source of gamma radiation.
Reason: Gamma emission is due to nuclear decay.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: When light ray is incident at polarising angle on glass, refracted light is partially polarised.
Reason: The intensity of light decreases in polarisation.
If both assertion and reason are true and reason the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
D.
If both assertion and reason are false.
Light reflected (in the rarer medium) is completely polarised. The intensity of light does not change in polarisation.
According to Brewster's law, relationship for light waves stating that the maximum polarization ( vibration in one plane only) of a ray of light may be achieved by letting the ray fall of a transparent medium in such a way that refracted ray makes an angle 90o with the reflected ray.
Assertion: A laser beam of 0.2 W power can drill holes through a metal sheet, whereas a 1000 W torch-light cannot.
Reason: The frequency of laser light is much higher than that of torch light.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: Electric appliances with metallic body. e.g., heaters, presses etc., have three pin connections, whereas an electric bulb has a two pin connection.
Reason: Three pin connections reduce heating of connecting cables.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: The sun rises some time before the actual sun-rise.
Reason: Because of the refraction through the different layers of atmosphere.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Assertion: Resolving power of a telescope depends only on wavelength.
Reason: This is proportional to square of wavelength.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.