Magnifying power of a simple microscope is (when final image is formed at D = 25 cm from eye)
|
(a) |
(b) 1 + |
(c) |
(d) |
Magnifying power of a simple microscope is (when final image is formed at D = 25 cm from eye)
|
(a) |
(b) 1 + |
(c) |
(d) |
(b) 1 +
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In a potentiometer experiment two cells of e.m.f. E1 and E2 are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of E2 is reversed, then the balancing length becomes 29 cm. The ratio of the e.m.f. of the two cells is
|
(a) 1 : 1 |
(b) 2 : 1 |
(c) 3 : 1 |
(d) 4 : 1 |
The colour of the positive column in a gas discharge tube depends on
|
(a) The type of glass used to construct the tube |
(b) The gas in the tube |
|
(c) The applied voltage |
(d) The material of the cathode |
Soap bubble appears coloured due to the phenomenon of
|
(a) Interference |
(b) Diffraction |
(c) Dispersion |
(d) Reflection |
A circular loop of radius 0.0157m carries a current of 2.0 amp. The magnetic field at the centre of the loop is (
|
(a) 1.57 |
(b) 8.0 |
|
(c) 2.5 |
(d) 3.14 |
In any Bohr orbit of the hydrogen atom, the ratio of kinetic energy to potential energy of the electron is
|
(a) 1/2 |
(b) 2 |
(c) -1/2 |
(d) -2 |
Three capacitors of 2μF, 3μF and 6μF are joined in series and the combination is charged by means of a 24 volt battery. The potential difference between the plates of the 6 μF capacitor is
|
(a) 4 volt |
(b) 6 volt |
(c) 8 volt |
(d) 10 volt |
A man is 180 cm tall and his eyes are 10 cm below the top of his head. In order to see his entire height right from toe to head, he uses a plane mirror kept at a distance of 1m from him. The minimum length of the plane mirror required is
| (a) 180 cm | (b) 90 cm | (c) 85 cm | (d) 170 cm |
The difference in the variation of resistance with temperature in a metal and a semiconductor arises essentially due to the difference in the
|
(a) Variation of scattering mechanism with temperature |
|
(b) Crystal structure |
|
(c) Variation of the number of charge carriers with temperature |
|
(d) Type of bon |