When a semiconductor is heated, its resistance
|
(a) Decreases |
(b) Increases |
(c) Remains unchanged |
(d) Nothing is definite |
When a semiconductor is heated, its resistance
|
(a) Decreases |
(b) Increases |
(c) Remains unchanged |
(d) Nothing is definite |
(a) Decreases
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Consider a radioactive material of half-life 1.0 minute. If one of the nuclei decays now, the next one will decay
|
(a) After 1 minute |
|
(b) After |
|
(c) After |
|
(d) After any time |
A single slit of width a is illuminated by violet light of wavelength 400 nm and the width of the diffraction pattern is measured as y. When half of the slit width is covered and illuminated by yellow light of wavelength 600 nm, the width of the diffraction pattern is
|
(a) The pattern vanishes and the width is zero |
(b) y / 3 |
|
(c) 3y |
(d) None of these |
A parallel plate air capacitor is charged to a potential difference of V. After disconnecting the battery, distance between the plates of the capacitor is increased using an insulating handle. As a result, the potential difference between the plates
|
(a) Decreases |
(b) Increases |
(c) Becomes zero |
(d) Does not change |
Light passes successively through two polarimeters tubes each of length 0.29m. The first tube contains dextro rotatory solution of concentration 60kgm–3 and specific rotation 0.01rad m2kg–1. The second tube contains laevo rotatory solution of concentration 30kg/m3 and specific rotation 0.02 radm2kg–1. The net rotation produced is
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(a) 15° |
(b) 0° |
(c) 20° |
(d) 10° |
A slit of size 0.15 cm is placed at 2.1 m from a screen. On illuminated it by a light of wavelength 5 × 10–5 cm. The width of central maxima will be
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(a) 70 mm |
(b) 0.14 mm |
(c) 1.4 mm |
(d) 0.14 cm |