Constantan wire is used in making standard resistances because its
|
(a) Specific resistance is low |
|
(b) Density is high |
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(c) Temperature coefficient of resistance is negligible |
|
(d) Melting point is high |
(c) Temperature coefficient of resistance is negligible
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
A steady current of 5 amps is maintained for 45 mins. During this time it deposits 4.572 gms of zinc at the cathode of a voltameter. E.C.E. of zinc is
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(a) 3.387 |
(b) 3.387 |
|
(c) 3.384 |
(d) 3.394 |
In a spherical condenser radius of the outer sphere is R. The different in the radii of outer and inner sphere in x. Its capacity is proportional to
|
(a) |
(b) |
(c) |
(d) |
A proton and an a-particle are accelerated through a potential difference of 100 V. The ratio of the wavelength associated with the proton to that associated with an a-particle is
|
(a) |
(b) 2 : 1 |
(c) 2 |
(d) |
Which of the transitions in hydrogen atom emits a photon of lowest frequency (n = quantum number)
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(a) n = 2 to n = 1 |
(b) n = 4 to n = 3 |
(c) n = 3 to n = 1 |
(d) n = 4 to n = 2 |
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 |
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(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 |
Four wires each of length 2.0 metres are bent into four loops P, Q, R and S and then suspended into uniform magnetic field. Same current is passed in each loop. Which statement is correct
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(a) Couple on loop P will be the highest |
(b) Couple on loop Q will be the highest |
|
(c) Couple on loop R will be the highest |
(d) Couple on loop S will be the highest |
Three resistors each of 4Ω are connected together to form a network. The equivalent resistance of the network cannot be
|
(a) 1.33 Ω |
(b) 3.0 Ω |
(c) 6.0 Ω |
(d) 12.0 Ω |
