Explanation:
Binding energy per nucleon in a nucleus first increases with increasing mass number (A) and reaches a maximum of 8.7MeV for A (50 - 80). Then, again it slowly starts decreasing with the increase in A and drops to the value of 7.5MeV.
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Two rods of same material and length have their electric resistance in ratio 1 : 2. When both rods are dipped in water, the correct statement will be
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(a) A has more loss of weight |
(b) B has more loss of weight |
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(c) Both have same loss of weight |
(d) Loss of weight will be in the ratio 1 : 2 |
Which is a wrong statement
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(a) The Wheatstone bridge is most sensitive when all the four resistances are of the same order |
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(b) In a balanced Wheatstone bridge, interchanging the positions of galvanometer and cell affects the balance of the bridge |
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(c) Kirchhoff's first law (for currents meeting at a junction in an electric circuit) expresses the conservation of charge |
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(d) The rheostat can be used as a potential divider |
Magnetic field intensity at the centre of coil of 50 turns, radius 0.5 m and carrying a current of 2 A is
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(a) 0.5 |
(b) 1.25 |
(c) 3 |
(d) 4 |
The two ends of a uniform conductor are joined to a cell of e.m.f. E and some internal resistance. Starting from the midpoint P of the conductor, we move in the direction of current and return to P. The potential V at every point on the path is plotted against the distance covered (x). Which of the following graphs best represents the resulting curve
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(a)
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(b)
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(c)
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(d)
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In the network shown in the figure, each of the resistance is equal to 2Ω. The resistance between the points A and B is
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(a) 1 Ω |
(b) 4 Ω |
(c) 3 Ω |
(d) 2 Ω |
The focal length of the objective of a compound microscope is:
