Samacheer Kalvi EM 12 Physics Vol1 Unit4 MCQs Mock Test

byJunaid Baig0-

12th Physics - Volume 1 Mock Test

Unit 4: Electromagnetic Induction and Alternating Current

Choose the correct answer from the multiple choices, then click "Next" to goto next question and click "OK" after seeing the score.

An electron moves on a straight line path XY as shown in the figure. The coil abcd is adjacent to the path of the electron. What will be the direction of current, if any, induced in the coil?

The current will reverse its direction as the electron goes past the coil

No current will be induced

abcd

adcb

A thin semi-circular conducting ring (PQR) of radius r is falling with its plane vertical in a horizontal magnetic field B, as shown in the figure.

The potential difference developed across the ring when its speed v, is

Zero

`\frac{Bv\pi r^2}2` and P is at higher potential

πrBv and R is at higher potential

2rBv and R is at higher potential

The flux linked with a coil at any instant t is given by `\varphi_B=10t^2-50t+250`. The induced emf at t=3s is

-190V

-10V

10V

190V

When the current changes from +2A to -2A in 0.05 s, an emf of 8 V is induced in a coil. The co-efficient of self-induction of the coil is

0.2 H

0.4 H

0.8 H

0.1 H

The current i flowing in a coil varies with time as shown in the figure. The variation of induced emf with time would be

(NEET – 2011)

A circular coil with a cross-sectional area of 4 `cm^2` has 10 turns. It is placed at the centre of a long solenoid that has 15 turns/cm and a cross-sectional area of 10 `cm^2`. The axis of the coil coincides with the axis of the solenoid. What is their mutual inductance?

7.54 µH

8.54 µH

9.54 µH

10.54 µH

In a transformer, the number of turns in the primary and the secondary are 410 and 1230 respectively. If the current in primary is 6A, then that in the secondary coil is

2 A

18 A

12 A

1 A

A step-down transformer reduces the supply voltage from 220 V to 11 V and increase the current from 6 A to 100 A. Then its efficiency is

1.2

0.83

0.12

0.9

In an electrical circuit, R, L, C and AC voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and current in the circuit is π/3. Instead, if C is removed from the circuit, the phase difference is again π/3. The power factor of the circuit is (NEET 2012)

1/2

1/√2

1

√3/2

In a series RL circuit, the resistance and inductive reactance are the same. Then the phase difference between the voltage and current in the circuit is

π/4

4000 V

400 V

1 V

In a series resonant RLC circuit, the voltage across 100 Ω resistor is 40 V. The resonant frequency ω is 250 rad/s. If the value of C is 4 µF, then the voltage across L is

600 V

4000 V

400 V

1 V

An inductor 20 mH, a capacitor 50 µF and a resistor 40 Ω are connected in series across a source of emf v=10 sin 340 t. The power loss in AC circuit is

0.76 W

0.89 W

0.46 W

0.67 W

The instantaneous values of alternating current and voltage in a circuit are `i=\frac1{\sqrt2}\sin(100\pi t) A` and `v=\frac1{\sqrt2}\sin(100\pi t+\frac\pi3) V`. The average power in watts consumed in the circuit is (IIT Main 2012)

1/4

√3/4

1/2

1/8

In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor when the energy is stored equally between the electric and magnetic fields is

Q/2

Q/√3

Q/√2

Q

`\frac{20}{\pi^2}H` inductor is connected to a capacitor of capacitance C. The value of C in order to impart maximum power at 50 Hz is

50 µF

0.5 µF

500 µF

5 µF

Samacheer Kalvi EM 12th Std Physics Vol1 Unit 4 MCQs Mock Test Instructions

Unit 4: Electromagnetic Induction and Alternating Current

Here you will find 15 MCQs questions and options. Read the questions carefully and select the appropriate answer for the question by selecting/clicking the box before the option. A pop-up box will open by displaying the result of the option selected. The result of each question will be based on percentages. Each question will have 3 chances to select the right option and for every chance, the percentage of scores will be reduced. Likewise, the remaining questions also take place. The overall percentage scored will be displayed at the completion of the mock test.

Note: Every time the page loads, the question and options will be randomized and takes you to the beginning of the particular exercise.

Button Navigations:

The Below Image shows the button navigations.

The Home Button On the Top and Bottom Navigates to the Homepage of the Subject (Example: To Physics if the mock test is taken from Physics).

The Next Unit Button on the Top and Bottom Navigates to the Next Unit (Example: From Unit 4 to Unit 5 and so on).

The Prev Unit Button on the Top and Bottom Navigates to the Previous Unit of the subject (Example: From Unit 4 to Unit 3 and so on).

The Next Button next to the question numbers Navigates to the Next Question (Example: From 1 to 2 and so on).

The Show All Questions Button Displays all the questions and options of that exercise on a single page.

The Option Box Icon (Box with Question mark icon), is the box that is to be selected for the correct option. By selecting/clicking the option box, a pop-up box will open by displaying the result of the option selected.

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