- ABinds the electrons of an atom to its nucleus.
- BBinds the protons and neutrons in the nucleus of an atom.
- CBinds atoms together to form molecules.
- DBinds atoms and molecules together to form solids.
Explanation:
Nuclear force binds the protons and neutrons in the nucleus of an atom.
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Match the List I with the List II from the combinations shown
|
(I) |
Presbiopia |
(A) |
Sphero-cylindrical lens |
|
(II) |
Hypermetropia |
(B) |
Convex lens of proper power may be used close to the eye |
|
(III) |
Astigmatism |
(C) |
Concave lens of suitable focal length |
|
(IV) |
Myopia |
(D) |
Bifocal lens of suitable focal length |
|
(a) I-A; II-C; III-B; IV-D |
(b) I-B; II-D; III-C; IV-A |
(c) I-D; II-B; III-A; IV-C |
(d) I-D; II-A; III-C; IV-B |
In a hydrogen atom, an electron moves in a circular orbit of radius 5.2
and produces a magnetic induction of 12.56 T at its nucleus. The current produced by the motion of the electron will be (Given ![]()
|
(a) 6.53 |
(b) 13.25 |
|
(c) 9.6 |
(d) 1.04 |
Which of the following is wrong statement
|
(a) An emf can be induced between the ends of a straight conductor by moving it through a uniform magnetic field |
|
(b) The self induced emf produced by changing current in a coil always tends to decrease the current |
|
(c) Inserting an iron core in a coil increases its coefficient of self induction |
|
(d) According to Lenz's law, the direction of the induced current is such that it opposes the flux change that causes it |
Three resistors are connected to form the sides of a triangle ABC, the resistance of the sides AB, BC and CA are 40 ohms, 60 ohms and 100 ohms respectively. The effective resistance between the points A and B in ohms will be
|
(a) 32 |
(b) 64 |
(c) 50 |
(d) 200 |
A battery is charged at a potential of 15 V for 8 hours when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 hours. The mean terminal voltage during discharge is 14 V. The "Watt-hour" efficiency of the battery is
|
(a) 82.5% |
(b) 80 % |
(c) 90% |
(d) 87.5% |