NAT I Engineering Physics With Answers

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NAT I Engineering Physics

Sr. # Questions Answers Choice
1 In LCR series AC circuit the phase angle between current and voltage is Any angle between 0 and ±π/2 π/2 π Any angle between 0 and π/2
2 A particle moving in a magnetic field has increase in its velocity then its radius of the circle Decreases Increases Remains the same Becomes half
3 A particle is moving in a uniform magnetic field then Its momentum changes but total energy remains the same Both momentum and total energy remains the same Both changes Total energy change but momentum remains
4 The direction of induced current is such that it opposes the very cause that has produced it This is the law of Lenz Faraday Kirchoff Fleming
5 Quantity that remains unchanged in a transformer is Voltage Current Frequency None of these
6 In an L-R circuit time constant is that time in which current grows from zero to the value 0.63 I<sub>o</sub> <span style="font-size: 14.44444465637207px;">0.50 I</span><sub>o</sub> <span style="font-size: 14.44444465637207px;">0.73 I</span><sub>o</sub> <span style="font-size: 14.44444465637207px;">I</span><sub>o</sub>
7 The average power dissipation in a pure capacitor in AC circuit is 1/2 CV<sup>2</sup> CV<sup>2</sup> 2CV<sup>2</sup> Zero
8 Which quantity is increased in step-down transformer? Current Voltage Power Frequency
9 The primary winding of transformer has 500 turns whereas its secondary has 5000 turns The primary is connected to an a.c supply of 20 V, 50 Hz The secondary will have an output of 200 V, 50 Hz 2 V, 50 Hz 200 V, 500 Hz
10 In an ac circuit with voltage V and current 1 the power dissipated is VI 1/2 VI 1/√2 VI Depends on the phase between V and 1
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