NEET Physics Alternating Current MCQs Set A

a)

b)

c) 5/6 A

d) None of these

Answer:

Question:

a) –X_g

b) R_g

c) X_g

d) zero

Answer: –X_g

Question:  When a voltage measuring device is connected to AC mains, the meter shows the steady input voltage of 220 V. This means

a)

b) input voltage cannot be AC voltage, but a DC voltage

c) The pointer of the meter is stuck by some mechanical defect

d) None of these

Answer:

Question: To reduce the resonant frequency in an L-C-R series circuit with a generator

a) another capacitor should be added in parallel to the first

b) the generator frequency should be reduced

c) dielectric in the capacitor should be removed

d) the iron core of the inductor should be removed

Answer: another capacitor should be added in parallel to the first

Question:  Which of the following combinations should be selected for better tuning of an L-C-R circuit used for communication?

a)

b)

c)

d) None of these

Answer:

Question:

a) 14.4 W

b) 18 W

c) 12 W

d) 8 W

Answer: 14.4 W

Question: The output of a step-down transformer is measured to be 24 V when connected to a 12 W light bulb. The value of the peak current is

a)

b)

c)

d) 2 A

Answer:

Question: A transformer having efficiency of 90% is working on 200V and 3kW power supply. If the current in the secondary coil is 6A, the voltage across the secondary coil and the current in the primary coil respectively are :

a) 450 V, 15A

b) 600V, 15A

c) 300 V, 15A

d) 450V, 13.5A

Answer: 450 V, 15A

Question:

a) 0.52 cos 314 t

b) 0.52 sin 314 t

c) Both

d) None of these

Answer: 0.52 cos 314 t

Question:

a) 4.0 A

b) 8.0 A

c) 2.0 A

d) None of these

Answer: 4.0 A