A point charge q is situated at a distance r on axis from one end of a thin conductiong rod of length L having a charge Q [uniformly distributed along its length]. The magnitude of […]
The distance of the closest approach of an alpha particle fired at a nucleus with kinetic energy K is r₀. The distance of the closest approach when the α particle is fired at the same […]
In a n-p-n transistor about 10¹⁰ electrons enter the emitter in 2 μs, when it is connected to a battery. Then, Iе=…….μA.
Options
(a) 400 (b) 200 (c) 800 (d) 1600
Correct Answer: […]
Two wires of equal length and equal diameter and having resistivities ρ₁ and ρ₂ are connected in series. The equivalent resistivity of the combination is
Options
(a) ρ₁+ρ₂/2 (b) ρ₁+ρ₂ (c) ρ₁ρ₂/ρ₁+ρ₂ (d) √ρ₁ρ₂
Number of spectral lines in hydrogen atom is
Options
(a) 8 (b) 6 (c) 15 (d) ∞
Correct Answer:
∞
Explanation:
No explanation available. Be the first to write the explanation for this […]
An alternating voltage given as, V=100√2 sin100t V is applied to a capacitor of 1 μF. The current reading of the ammeter will be equal to …….. mA
Options
(a) 20 (b) 10 (c) […]
Which gate can be obtained by shorting both the input terminals of a NOR gate?
Options
(a) NOT (b) OR (c) AND (d) NAND
Correct Answer:
NOT
Explanation:
No explanation available. Be the […]
A rod of 10 cm length is moving perpendicular to uniform magntic field of intensity 5×10⁻⁴Wbm⁻². If the acceleration of the rod is 5ms⁻¹, then the rate of increase of induced emf is
Options […]
A plane polarised light is incident normally on a tourmaline plate. Its E vector make an angle of 60⁰ with the optic axis of the plate. Find the percentage difference between initial and final intensities […]
A change of 0.04 V takes place between the base and the emitter when an input signal is connected to the CE transistor amplifier. As a result, 20μA change take place in the base current […]
2017 Copyright Doctor Dreams Training Academy