Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 1>Q 1

EASY

NEET

IMPORTANT

Earn 100

Explain why A.C. is more dangerous than D.C. ?

Important Questions on Alternating Current

HARD

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 1>Q 2

Show that average heat produced during a cycle of AC is same as produced by DC with

I = I_{rms}

.

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IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 1>Q 3

An ordinary moving-coil ammeter used for

DC

cannot be used to measure

AC

even if its frequency is low. Why?

EASY

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 1>Q 4

Find the time required for a

50 Hz

alternating current to change its value from zero to the RMS value.

EASY

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IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 1>Q 5

The current and voltage in a circuit is given by,

i = 3.5 \sin (628 t + 30 °) A, V = 28 \sin (628 t - 30 °) V

. Find time period of current.

EASY

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IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 1>Q 6

The current and voltage in a circuit is given by,

i = 3.5 \sin (628 t + 30 °) A, V = 28 \sin (628 t - 30 °) V

. The phase difference between voltage and current.

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 1

The figure given below shows the variation of an alternating emf with time. What is the average value of the emf for the shaded part of the graph?
Question Image

EASY

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IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 2

A voltage

V = 60 \sin (π t)

volt is applied across a

20 Ω

resistor. What will an ac ammeter in series with the resistor read?

MEDIUM

NEET

IMPORTANT

Beta Question Bank for Medical: Physics>Chapter 28 - Alternating Current>BEGINNER'S BOX - 2>Q 3

An alternating current source

E = 100 \sin (1000 t) V

is connected through an inductor of

10 μ H

then write down the equation of current.