Physics Alternating Current Test Online Preparation Mcqs Physics Alternating Current Test Online Preparation Mcqs With Answers Start Below 123456789101112131415Show paginator Hide paginator 7% Question 1 of 15 1. A pure variable resistor is connected in series with a pure capacitor of fixed capacitance. The impedance of the circuit _____.A. RemainsB. Becomes infiniteC. IncreasesD. Becomes zeroQuestion 1 of 15 Loading... Question 2 of 15 2. The value of the steady current, which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current, is _______A. Sinusoidal currentB. Net currentC. r.m.s currentD. Average currentQuestion 2 of 15 Loading... Question 3 of 15 3. When a pure inductor of inductance L, and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V, the potential difference across both L&C will be ______.A. SameB. DifferentC. At L will be more than at CD. At L will be less than at CQuestion 3 of 15 Loading... Question 4 of 15 4. The phase angle between the voltage and the current in an AC circuit consisting of a resistance is:A. 45°B. 180°C. 90°D. ZeroQuestion 4 of 15 Loading... Question 5 of 15 5. Choose the correct statement. In the case of AC circuit, ohm’s law holds for ______A. Peaks value of voltage and currentB. Effective values of voltage and currentC. Instantaneous values of voltage and currentD. All of the aboveQuestion 5 of 15 Loading... Question 6 of 15 6. An alternating current of r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing 10Ω resistor. The peak current is then ______.A. 20.66AB. 6.66AC. 5.66AD. 20AQuestion 6 of 15 Loading... Question 7 of 15 7. An inductive coil has a resistance of 100Ω. When an AC signal of frequency 1000Hz is fed to the coil, the applied voltage leads the current by 45°. What is the inductance of the coil?A. 16mHB. 20mHC. 10mHD. 12mHQuestion 7 of 15 Loading... Question 8 of 15 8. In an LCR series circuit, if V is the effective value of the applied voltage, V_{R} is the voltage across R, V_{L }is the effective voltage across L & V_{c} is the effective voltage across C thenA. V = VR+VL+VcB. V2 = VR2 + VL2 + Vc2C. V2 = VL2 + (VR - Vc)2D. V2 = VR2 + (VL - Vc)2Question 8 of 15 Loading... Question 9 of 15 9. Maxwell derived mathematically that the velocity of the electromagnetic waves is ________.A. 1/√μo/ϵoB. √μoϵoC. 1/ϵoD. 1/√μoϵoQuestion 9 of 15 Loading... Question 10 of 15 10. A changing magnetic flux produces around itself and induced ______.A. Magnetic fieldB. Artificial gravitational fieldC. Electromagnetic forceD. Electric fieldQuestion 10 of 15 Loading... Question 11 of 15 11. Electromagnetic waves travel in free space with the speed of _______.A. β raysB. Cathode raysC. Positive raysD. γ raysQuestion 11 of 15 Loading... Question 12 of 15 12. Electromagnetic waves consists of _________.A. EnergyB. NoneC. MassD. HeatQuestion 12 of 15 Loading... Question 13 of 15 13. An inductor may store energy in _________A. Its coilsB. Both electric and magnetic fieldC. Its electric fieldD. Its magnetic fieldQuestion 13 of 15 Loading... Question 14 of 15 14. Waves emitted from the antenna are ________.A. Sound wavesB. Modulated wavesC. Radio wavesD. Electromagnetic wavesQuestion 14 of 15 Loading... Question 15 of 15 15. A wire of resistance R is coil inductivity so that its inductance is L. The impedance of the coil at a frequency of f is:A. (R2+4π2f2L2)1/2B. R+1/2πfLC. (R2+f2L2)1/2D. (R+2πfL)1/2Question 15 of 15 Loading... Loading...

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