Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 23

EASY

NEET

IMPORTANT

Earn 100

The relation between an A.C. voltage source and time in SI units is:
$V = 120 \sin (100 πt) \cos (100 πt) V$ value of peak voltage and frequency will be respectively-

50% studentsanswered this correctly

Important Questions on Alternating Current

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 24

If an AC main supply is given to be

220 V

. What would be the average emf during a positive half-cycle ?

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 25

The hot wire ammeter measures:

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 26

Frequency of A.C. in India is,

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 27

For an alternating current

I = I_{0} \cos ω t,

What is the rms value and peak value of current :-

HARD

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 28

If a step-up transformer have turn ratio

5

, frequency

50 Hz

, root-mean-square value of potential difference on primary

100 V

and the resistance of the secondary winding is

500 Ω

, then the peak value of voltage in secondary winding will be (the efficiency of the transformer is

100 %

),

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 29

A resonant AC circuit contains a capacitor of capacitance

10^{- 6} F

and an inductor of

10^{- 4} H

. The frequency of electrical oscillations will be :-

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 30

A resistance of

300 Ω

and an inductance of

1 / π

henry are connected in a series to an

A C

voltage of

20 V

and

200 Hz

frequency. The phase angle between the voltage and current is

HARD

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>Exercise (Conceptual Questions)>Q 32

A

12 Ω

resistor and a

0.21 H

inductor are connected in series to an AC source operating at

20 V, 50 Hz

. The phase angle between the current and the source voltage is