IIT JEE : Electromagnetic Induction Electromagnetic Waves QUESTIONS AND ANSWERS :: part3 : 21 to 25
Following IIT JEE Entrance Multiple choice objective type questions and answers will help you in Maths, Physics and Chemistry 2024 examinations :
21.A transformer is used to light a 100W and 110 V lamp from a 230 V mains. If the main current is 0.5 A, the efficiency of the transformer is |
20% |
50% |
87% |
67% |
22.When power is drawn from the secondary coil of the transformer, the dynamic resistance |
remains same |
decreases |
increases |
fluctuates. |
23.A 20V ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V, the voltage across the coil is |
16 V |
10 V |
8 V |
6 V |
24.An A.C. voltmeter reads 20 V across a resistor, 30 V across an inductor and 15 V across a capacitor in LCR series circuit. In this case the supply voltage will be |
100 V |
60 V |
50 V |
25 V |
25.The S.I. unit of magnitude flux is |
Maxwell |
Tesla |
Weber |
Henry |
More Electromagnetic Induction Electromagnetic Waves QUESTIONS AND ANSWERS available in next pages
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