Why is secondary immune response more intense than the primary response in humans ? Give a reason.
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The diagonal of a rectangular field is 60 metres more than the shorter side. If the longer side is 30 metres more than the shorter side,
Solution: Let the length of the shorter side be x metres. Thus the length of the longer side=(x+30) m Length of the diagonal=(x+60)m Each angle of a rectangle=90 degrees By Pythagoras Theorem, (diagonal)2=(shorter side)2+(longer side)2 (x+60)2 ...
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Why is immune system essential for our health?
The immune system of our body is a kind of defense mechanism to fight against pathogenic microbes. It has cells that are specialized to kill infecting microbes and keep our...
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Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle.
The temperature of both boiling water and steam is 100°C, but steam has more energy because of latent heat of vapourisation.
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A LASER is a source of very intense, monochromatic, and unidirectional beam of light. These properties of a laser light can be exploited
Time taken by the laser beam to return to Earth after reflection from the Moon = 2.56 s Speed of light = 3 × 108 m/s Time taken by the laser beam to...
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A photographic plate records sufficiently intense lines when it is exposed for 12s to a source of 10W.
To get equally intense lines on the photographic plate, the radiant flux (energy) should be same. So, 10W × 12sec = 12W × t => t =10Wx12 sec/12W= 10 sec.
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Assertion : N2 is less reactive than P4. Reason : Nitrogen has more electron gain enthalpy than phosphorus
(c) Assertion is correct, reason is incorrect
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Which soil type is the result of intense leaching due to heavy rainfall?
Laterite soil......
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Give reason for the following: (a) LiCl is more covalent than KCl. (b) LiF has lower melting point than NaCl.
(a) Due to smaller size and high poalrising power of Li+ ion ,LiCl is more covalent than KCl. (b) Small cation Li+ ion highly polarizes large anion I-, LiI is more...
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There are 6 person ; A ,B, C, D, E and F. A has 3 items more than C D has 4 items less than B E has 6 items less than F
(c) A = C + 3, D = B – 4, E = F – 6 C = E + 2, F = D + 3 On adding, we get A =...
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Assertion (A).H2O2 has higher boiling point than water Reason (R). The dipole moment of H2O2 is little more than that of H2O.
(B) If both assertion and reason are true, but reason is not the true explanation of the assertion.
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