Copper has face centered cubic (fcc) lattice with interatomic spacing equal to 2.54Å. The value of the lattice constant for this lattice is
|
(a) 1.27 Å |
(b) 5.08 Å |
(c) 2.54 Å |
(d) 3.59 Å |
(d) 3.59 Å
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A new flashlight cell of e.m.f. 1.5 volts gives a current of 15 amps, when connected directly to an ammeter of resistance 0.04Ω. The internal resistance of cell is
|
(a) 0.04 Ω |
(b) 0.06 Ω |
(c) 0.10 Ω |
(d) 10 Ω |
A magnetic needle suspended by a silk thread is vibrating in the earth's magnetic field. If the temperature of the needle is increased by 500°C, then
| (a) The time period decreases | (b) The time period remains unchanged |
| (c) The time period increases | (d) The needle stops vibrating |
The control rod in a nuclear reactor is made of
|
(a) Uranium |
(b) Cadmium |
(c) Graphite |
(d) Plutonium |
If in the experiment of Wheatstone's bridge, the positions of cells and galvanometer are interchanged, then balance points will
|
(a) Change |
|
(b) Remain unchanged |
|
(c) Depend on the internal resistance of cell and resistance of galvanometer |
|
(d) None of these |
X-rays are in nature similar to
| (a) Beta rays | (b) Gamma rays | (c) de-Broglie waves | (d) Cathode rays |