Assertion: In a transistor the base is made thin.
Reason: A thin base makes the transistor stable.
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: 90Sr from the radioactive fall out from a nuclear bomb ends up in the bones of human beings through the milk consumed by them. It causes impairment of the production of red blood cells.
Reason: The energies β-particles emitted in the decay of 90Sr damage the bone marrow.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are but reason is not the correct explanation of assertion
If asserion and reason is false
If both assertion and reason are false
Assertion: At the first glance, the top surface of the Morpho butterfly's wing appears a beautiful blue-green. If the wing moves the colour changes.
Reason: Different pigments in the wing reflect light at different angles.
If both assertion and reason are true and reason is 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: A famous painting was painted by not using brush strokes in the usual manner, but rather a myriad of small colour dots. In this painting the colour you see at any given place on the painting changes as you move away.
Reason: The angular separation of adjacent dots changes with the distance from the painting.
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
A.
If both assertion and reason are true and reason is the correct explanation of assertion
We see two closely situated very small dots separate when their angular separation of the viewer is more than that required by Rayleigh's criterion.
θR = 1.22
d is diameter of eye
λ is wavelength of light seen
If distance between spot is D and L be the distance of observer from the painting then
θ =
1.22
L =
If the red light having greater λ, the value of L will be smaller and for violet colour, this distance is larger, If we move away from the painting adjacent red dots become indistinguishable before adjacent blue dots so. So, to make two dots distinguishable we shall have to give distance of the observer (L) a minimum value. At a greater distance colours of adjacent dots blend together. In this way we can have different view of dots by looking at it from different distance ( or changing L).
So both assertion and reason are correct.
Assertion: Energy is released in nuclear fission.
Reason: Total binding energy of the fission fragments is larger than the total binding energy of the parent nucleus.
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 is false
Assertion: Heavy water preferred ever ordinary water as a moderator in reactors.
Reason: Heavy water, used for slowing down the neutrons, has lesser absorption probability
of neutrons than ordinary water.
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: In He-Ne laser, population inversion takes place between energy levels of neon atoms.
Reason: Helium atoms have a meta-stable energy level.
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: A transistor amplifier in common emitter configuration has a low input impedence.
Reason: The base to emitter region is forward biased.
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: Crystalline solids can cause X-rays to diffract.
Reason: Interatomic distance in crystalline solids is of the order of 0.1 nm.
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: Photoelectric effect demonstrates the wave nature of light.
Reason: The number of photoelectrons is proportional to the frequency of 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