- 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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Two particles A and B of masses
and
respectively and having the same charge are moving in a plane. A uniform magnetic field exists perpendicular to this plane. The speeds of the particles are
and
respectively, and the trajectories are as shown in the figure. Then

|
(a) |
(b) |
|
(c) |
(d) |
The period of oscillations of a magnetic needle in a magnetic field is 1.0 sec. If the length of the needle is halved by cutting it, the time period will be
| (a) 1.0 sec | (b) 0.5 sec | (c) 0.25 sec | (d) 2.0 sec |
Assertion : The setting sun appears to be red.
Reason : Scattering of light is directly proportional to the wavelength.
|
(a) If both assertion and reason are true and the reason is the correct explanation of the assertion. |
|
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion. |
|
(c) If assertion is true but reason is false. |
|
(d) If the assertion and reason both are false. |
What is the ratio of heat generated in R and 2R

|
(a) 2 : 1 |
(b) 1 : 2 |
(c) 4 : 1 |
(d) 1 : 4 |
Two identical charged spherical drops each of capacitance C merge to form a single drop. The resultant capacitance is
|
(a) Equal to 2C |
(b) Greater than 2C |
|
(c) Less than 2C but greater than C |
(d) Less than C |
An object 5 cm tall is placed 1m from a concave spherical mirror which has a radius of curvature of 20 cm The size of the image is
|
(a) 0.11 cm |
(b) 0.50 cm |
(c) 0.55 cm |
(d) 0.60 cm |
$\frac{1}{8}$
$\frac{1}{4}$
$4$
$8$
A beam of ions with velocity 2
enters normally into a uniform magnetic field of 4
If the specific charge of the ion is 5
, then the radius of the circular path described will be
|
(a) 0.10 m |
(b) 0.16 m |
(c) 0.20 m |
(d) 0.25 m |