NAT II Physical Science Physics With Answers

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NAT II Physical Science Physics

Sr. # Questions Answers Choice
1 Energy is stored in the choke coil in the form of Heat Magnetic energy Electric energy Electro-magnetic energy
2 The peak voltage in 220 volt A.C. supply is nearly 220 volt 253 volt 311 volt 440 volt
3 An ideal choked (used along with fluorescent tube) would be A pure resistor A pure capacitor A pure inductor A combination of an inductor and a capacitor
4 A capacitor acts as an infinite resistance for AC DC Both AC and DC Neither AC nor DC
5 A 220 V, 50 Hz. A.C. 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
6 In an A.C. circuit, a resistance of R ohm is connected in series with an inductance L. If phase angle between voltage and current be 45°, the value of inductive reactance will be R/4 R/2 R Cannot be found with the given data
7 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
8 A particle is moving in a uniform magnetic filed, 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
9 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
10 Quantity that remains unchanged in a transformer is Voltage Current Frequency None of these
11 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> 0.50 I<sub>o</sub> 0.37 I<sub>o</sub> I<sub>o</sub>
12 Which quantity is increased in step-down transformer? Current Voltage Power Frequency
13 The number of turns in the primary coil of a transformer is 200 and the number of turns in the secondary coil is 10. If 240 volts ac are applied to the primary, the output the secondary will be 48A 24V 12V 6V
14 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 200V, 50 Hz 2V, 50 Hz 200V, 500 Hz 2V, 5 Hz
15 Which of the following particles would experience the largest magnetic force when projected with the same velocity perpendicular to a magnetic field? Proton Electron He<sup>+</sup> Li<sup>+</sup>
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