3.Alternating current flowing through a certain electrical device leads over the potential difference across it by 90° State whether this device is a resistor, capacitor or an inductor.
469 Views
4.What is the shape of the wavefront diverging from a point source of light?
722 Views
Advertisement
5.The critical angle for a given transparent medium and air is ic. A ray of light travelling in air is incident on this transparent medium at an angle of incidence equal to the polarising angle ip What is the relation between the two angles ic and ip?
741 Views
6.What are the dark lines seen in the solar spectrum called?
916 Views
7.Given an example where energy is converted into matter
467 Views
8.To convert a pure semiconductor into n-type semiconductor, what type of impurity is added to it?
780 Views
Advertisement
Multiple Choice Questions
9.
Choose the correct alternative (a), (b), (c) or (d):
∈0= 9∈w
∈0=81∈w
∈w=9∈0
∈w=81∈o
1264 Views
10.
Five resistors are connected as shown in Figure
The effective resistance i.e. equivalent resistance between the points A and B is: