- AScalar quantity.
- BVector quantity.
- CDimensionless quantity.
- DNone of these options.
Explanation:
Current density is a vector quantity.
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The refraction of light is commonly known as:
Referring to the figure below, the effective resistance of the network is
|
(a) 2 r |
(b) 4 r |
(c) 10 r |
(d) 5r/2 |
Water boils in an electric kettle in 15 minutes after switching on. If the length of the heating wire is decreased to 2/3 of its initial value, then the same amount of water will boil with the same supply voltage in
|
(a) 15 minutes |
(b) 12 minutes |
(c) 10 minutes |
(d) 8 minutes |
Critical angle of light passing from glass to air is minimum for
|
(a) Red |
(b) Green |
(c) Yellow |
(d) Violet |
The circuit shown in following figure contains two diode D1 and D2 each with a forward resistance of 50 ohms and with infinite backward resistance. If the battery voltage is 6 V, the current through the 100 ohm resistance (in amperes) is

| (a) Zero | (b) 0.02 | (c) 0.03 | (d) 0.036 |
Magnification of an optical instrument is expressed in: