An optically active compound
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(a) Rotates the plane polarised light |
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(b) Changing the direction of polarised light |
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(c) Do not allow plane polarised light to pass through |
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(d) None of the above |
(a) Rotates the plane polarised light
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Given below are four logic gate symbol (figure). Those for OR, NOR and NAND are respectively
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(a) 1, 4, 3 |
(b) 4, 1, 2 |
(c) 1, 3, 4 |
(d) 4, 2, 1 |
The distance of two points on the axis of a magnet from its centre is 10 cm and 20 cm respectively. The ratio of magnetic intensity at these points is 12.5 : 1. The length of the magnet will be
| (a) 5 cm | (b) 25 cm | (c) 10 cm | (d) 20 cm |
A uniform magnetic field, parallel to the plane of the paper existed in space initially directed from left to right. When a bar of soft iron is placed in the field parallel to it, the lines of force passing through it will be represented by
A photocell stops emission if it is maintained at 2V negative potential. The energy of most energetic photoelectron is (a) 2eV (b) 2J (c) 2kJ (d) 2keV A semiconductor X is made by doping a germanium crystal with arsenic (Z = 33). A second semiconductor Y is made by doping germanium with indium (Z = 49). The two are joined end to end and connected to a battery as shown. Which of the following statements is correct (a) X is P-type, Y is N-type and the junction is forward biased (b) X is N-type, Y is P-type and the junction is forward biased (c) X is P-type, Y is N-type and the junction is reverse biased (d) X is N-type, Y is P-type and the junction is reverse biased
→→When the intensity of a light source is increased:→Magnetic meridian is:
→A straight copper wire is moved in a uniform magnetic field such that it cuts the magnetic lines of force. Then→
→
→Cells are joined in parallel. The internal resistance of the cell is: