12th Class Physics Chapter 16 Alternating Current Preparation Online Test

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Sr.#	Question	Answer
1	In AC system we generate sine wave form because:	A. It san be easily draw B. It produces least disturbance in electrical circuits C. It is nature standard D. Other waves cannot be produced easily
2	The main use of A.C is	A. Minimum line losses B. Long distance transmission C. Stepping up to required voltage only D. Steeping down to required voltage only
3	If the frequency of A.C. supplied is doubled then the capacitive reactance becomes.	A. Half B. Two C. Four times D. One fourth
4	The phase angle of a series RLC circult at resonant frequency is	A. 1/2 B. sigma C. Zero D. sigma /4
5	The sum of positive and negative peak value called.	A. R.M.S. value B. P-P value C. Peak value D. Average value
6	In A.C circuit through a capacitor which one is:	A. Current leads voltage by 90^∘ B. Current lags behind voltage by 90^∘ C. Both will be in phase D. None of above
7	During each cycle A.C. voltage reaches a peak value.	A. Once B. Twice C. Thrice D. Four time
8	X_L=	A. 2πfL B. 1/2πfL C. 2πfL D. fL/2π
9	In three phase A.C. generator the phase difference between each pair of coil is.	A. 45^o B. 90^o C. 120^o D. 60^o
10	If I_o is the peak value of current, then its root mean square value is given by	B. 2 I_o C. I_o D. 0.7 I_o