NAT I Medical Physics With Answers

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NAT I Medical Physics

Sr. # Questions Answers Choice
1 A 220 V, 50 Hz, AC source is connected to an inductance of 0.2.H and a resistance of 20 ohm in series What is the current in the circuit? 10 A 5 A 33.3  A 3.33 A
2 In an AC circuit a resistance of R ohm i connected in series with an inductance L if phase angle between voltage and current be 45o the value of inductive reactance will be R/4 R/2 R
3 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
4 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
5 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
6 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
7 Quantity that remains unchanged in a transformer is Voltage Current Frequency None of these
8 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>
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