Below figures (1) and (2) represent lines of force. Which is correct statement
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(a) Figure (1) represents magnetic lines of force |
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(b) Figure (2) represents magnetic lines of force |
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(c) Figure (1) represents electric lines of force |
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(d) Both figure (1) and figure (2) represent magnetic lines of force |
(a) Figure (1) represents magnetic lines of force
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A 100 watt bulb working on 200 volt and a 200 watt bulb working on 100 volt have
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(a) Resistances in the ratio of 4 : 1 |
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(b) Maximum current ratings in the ratio of 1 : 4 |
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(c) Resistances in the ratio of 2 : 1 |
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(d) Maximum current ratings in the ratio of 1 : 2 |
The energy band diagrams for three semiconductor samples of silicon are as shown. We can then assert that
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(a) Sample X is undoped while samples Y and Z have been doped with a third group and a fifth group impurity respectively |
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(b) Sample X is undoped while both samples Y and Z have been doped with a fifth group impurity |
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(c) Sample X has been doped with equal amounts of third and fifth group impurities while samples Y and Z are undoped |
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(d) Sample X is undoped while samples Y and Z have been doped with a fifth group and a third group impurity respectively |
A double star is a system of two stars rotating about their centre of mass only under their mutual gravitational attraction. Let the star have mass m and 2m and their separation be l. Their time period of rotation about their centre of mass will be proportional to
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(a) |
(b) l |
(c) |
(d) |
If in the experiment of Wheatstone's bridge, the positions of cells and galvanometer are interchanged, then balance points will
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(a) Change |
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(b) Remain unchanged |
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(c) Depend on the internal resistance of cell and resistance of galvanometer |
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(d) None of these |
The combination of gates shown below produces
| (a) AND gate | (b) XOR gate | (c) NOR gate | (d) NAND gate |
