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1.

A transmitting station transmits radiowaves of wavelength 360 m. Calculate the inductance of coil required with a condenser of capacity 1.20 μF in the resonant circuit to receive them

3.07×10

^{-8}H2.07×10

^{-8}H4.07×10

^{-8}H6.07×10

^{-8}H

2.

A capacitor of capacitance 2μF is connected in the tank circuit of an oscillator oscillating with a frequency of 1 kHz. If the current flowing in the circuit is 2 mA, the voltage across the capacitor will be

0.16 V

0.32 V

79.5 V

159 V

3.

The core used in transformer and other electromagnetic instruments is laminated, the reason is

to increase the electric field

to increase the magnetic field

to reduce the loss of energy due to eddy currents

to decrease the resistance

4.

If in a circuit current lags behind EMF by $\frac{\mathrm{\pi}}{2}$. Then it is a/an

resistor circuit

capacitor

inductor circuit

CR circuit

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5.

The peak value of alternating current is $5\sqrt{2}$ ampere. The mean square value of current will be

5 A

2.5 A

$5\sqrt{2}$ A

None of the above

6.

An AC supply gives 30V_{rms} which is fed on a pure resistance of 10 ohm. the power dissipated in this is

90watt

45watt

90.2watt

180watt

7.

**Assertion:** The quantity L/R possesses dimension of time.

**Reason:** To reduce the rate of increase of current through a solenoid, we should increase the time constant ( L/R ).

If both the assertion and reason are true and reason is a correct explanation of assertion

If both assertion and reason are true but assertion is not correct explanation of the assertion

If the assertion is true but the reason is false.

If both assertion and reason are false.

8.

A capacitor when charged by a potential difference of 200 volt, stores a charge of 0.1 C. By discharging, energy liberated by the capacitor is

-30 J

-15 J

10 J

20 J

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9.

If an ideal parallel LC circuit, the capacitor is changed by connecting it to a d.c source which is then disconnected. The current in the circuit

becomes zero instantaneously

grows monotonically

decays monotonically

oscillates instantaneously

10.

A coil having resistance of 50 ohm and an inductance of 10 ohm, is connected to a 100 volt battery. The energy stored in the coil is

10 J

20 J

30 J

40 J

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