In electromagnetic wave, according to Maxwell, changing electric field gives
Options
(a) stationary magnetic field (b) conduction current (c) eddy current (d) displacement current
Correct Answer:
displacement current
Explanation:
No explanation available. Be […]
A resistor 30Ω, inductor of reactance 10 Ω and capacitor of reactance 10 Ω are connected in series to an a.c. voltage source. The current in the circuit is
Options
(a) 10√2 A […]
A conductor of length 5 cm is moved parallel to itself with a speed of 2 m/s, perpendicular to a uniform magnetic field of 10⁻³ Wb/m². The induced emf generated is
Options
(a) […]
CO₂ laser uses
Options
(a) Microwaves (b) Infra red (c) Ultra violet (d) Visible light
Correct Answer:
Ultra violet
Explanation:
No explanation available. Be the first to write the explanation for this question […]
A photosensitive metallic surface has work function, hν₀. If photons of energy 2hν₀ fall on this surface, the electrons come out with a maximum velocity of 4×10⁶m/s. When the photon energy is increased to 5hν₀, […]
A galvanometer of 50 Ω resistance has 25 divisions. A current of 4×10⁻⁴ A gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volt, it should […]
A carbon film resistor has colour code green, black, violet, gold. The value of the resistor is
Options
(a) 50Ω (b) 500Ω (c) 500±5%MΩ (d) 500±10%Ω
Correct Answer:
500±5%MΩ
Explanation:
No explanation available. […]
As per Bohr model, the minimum energy (in eV) required to remove an electron from the ground state of doubly ionised Li-atom (Z=3) is
Options
(a) 1.51 (b) 28.7 (c) 53.9 (d) 122.4
A series L-C-R circuit contains inductance 5 mH, capacitance 2 μF and resistance 10Ω. If a frequency AC source is varied, then what is the frequency at which maximum power is dissipated?
Options
A condenser of 250 μF is connected in parallel to a coil of inductance of 0.16 mH, while its effective resistance is 20Ω. Determine the resonant frequency.
Options
(a) 9×10⁴ Hz (b) 16×10⁷ […]
2017-2025 Copyright Doctor Dreams Training Academy - About Us - Privacy Policy - Terms & Conditions - Contact Us - Refund Policy