- AIron Resistor
- BCarbon Resistor
- CWire wound Resistor
- DBoth b and c
Explanation:
Carbon resistor is difficult to make of having a value less than about 20 Ohms because they have ability to withstand high energy pulses, when current flow through the carbon composition body conducts the energy. So carbon resistor can be made with a higher resistance.
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In Young’s double slit experiment the amplitudes of two sources are 3a and a respectively. The ratio of intensities of bright and dark fringes will be
|
(a) 3 : 1 |
(b) 4 : 1 |
(c) 2 : 1 |
(d) 9 : 1 |
The pressure exerted by an electromagnetic wave of intensity I (watts/m2) on a nonreflecting surface is [c is the velocity of light]
|
(a) Ic |
(b) |
(c) I/c |
(d) |
X-rays are known to be electromagnetic radiations. Therefore the X-ray photon has
| (a) Electric charge |
| (b) Magnetic moment |
| (c) Both electric charge and magnetic moment |
| (d) Neither electric charge nor magnetic moment |
A parallel plate capacitor has a capacity C. The separation between the plates is doubled and a dielectric medium is introduced between the plates. If the capacity now becomes 2C, the dielectric constant of the medium is
|
(a) 2 |
(b) 1 |
(c) 4 |
(d) 8 |
The north pole of a long horizontal bar magnet is being brought closer to a vertical conducting plane along the perpendicular direction. The direction of the induced current in the conducting plane will be
|
(a) Horizontal |
(b) Vertical |
(c) Clockwise |
(d) Anticlockwise |
When one of the slits of Young’s experiment is covered with a transparent sheet of thickness 4.8 mm, the central fringe shifts to a position originally occupied by the 30th bright fringe. What should be the thickness of the sheet if the central fringe has to shift to the position occupied by 20th bright fringe
|
(a) 3.8 mm |
(b) 1.6 mm |
(c) 7.6 mm |
(d) 3.2 mm |
When a hydrogen atom is raised from the ground state to an excited state
|
(a) P.E. increases and K.E. decreases |
|
(b) P.E. decreases and K.E. increases |
|
(c) Both kinetic energy and potential energy increase |
|
(d) Both K.E. and P.E. decrease |