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The wavelength of maximum energy, released during an atomic explosion, was 2.93 × 10–10 m. Given that the Wien's constant is 2.93 × 10–3 m K, the maximum temperature attained must be of the order of
|
(a) 10–7 K |
(b) 107 K |
(c) 10–13 K |
(d) 5.86 × 107 K |
A condenser having a capacity of 6mF is charged to 100 V and is then joined to an uncharged condenser of 14 μF and then removed. The ratio of the charges on 6mF and 14mF and the potential of 6mF will be
|
(a) |
(b) |
(c) |
(d) |
A thin lens made of glass of refractive index 1.5 has a front surface + 11 D power and back surface – 6 D. If this lens is submerged in a liquid of refractive index 1.6, the resulting power of the lens is
|
(a) – 0.5 D |
(b) + 0.5 D |
(c) – 0.625 D |
(d) + 0.625 D |
Three capacitors of 2.0, 3.0 and 6.0 μF are connected in series to a 10 V source. The charge on the 3.0 μF capacitor is
|
(a) 5 μC |
(b) 10 μC |
(c) 12 μC |
(d) 15 μC |
In a radioactive decay, neither the atomic number nor the mass number changes. Which of the following would be emitted in the decay process
|
(a) Proton |
(b) Neutron |
(c) Electron |
(d) Photon |
If a wire of resistance R is melted and recasted to half of its length, then the new resistance of the wire will be
|
(a) R/4 |
(b) R/2 |
(c) R |
(d) 2R |
A silver voltameter of resistance 2 ohm and a 3 ohm resistor are connected in series across a cell. If a resistance of 2 ohm is connected in parallel with the voltameter, then the rate of deposition of silver
|
(a) Decreases by 25% |
(b) Increases by 25% |
|
(c) Increases by 37.5% |
(d) Decreases by 37.5% |
