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NDA GK Previous Papers Chapterwise MCQs - Electricity & Magnetism
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NDA GK Previous Papers Chapterwise MCQs - Electricity & Magnetism
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25 Questions

1.
What should be the reading of the voltmeter in the circuit given above? (All the resistance are equal to 1 W and the battery is of 1.5 volt)
2. We use CFL to save electrical energy and to provide sufficient light. The full form of CFL is
3. Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice versa?
4. A positively charged particle projected towards west is deflected towards north by a magnetic field. The direction of the magnetic field is
5. A proton and an electron having equal velocity are allowed to pass through a uniform magnetic field. Which one of the following statements is correct in this connection?
6. Two metallic wires A and B are of same material and have equal length. If the cross-sectional area of B is double that of A, then which one among the following is the electrical resistance of B?
7. A wire of resistance 16 W is bent in the form of a circle. What is the effective resistance between diametrically opposite points?
8. The torque on a rectangular coil placed in a uniform magnetic field is large when the
9. A hollow metal ball carrying an electric charge produces no electric field at points
10. When long dry hair is brushed the strands often move away from each other because while brushing
11. If a heater coil is cut into two equal parts and only one part is used in the heater, the heat generated will be
12. If the current is flowing through a 10 ohm resistor, then in which one of the following cases maximum heat will be generated?
13. A simple circuit contains a 12 V battery and a bulb having 24 ohm resistance. When you turn on the switch, the ammeter connected in the circuit would read
14.
B is a 1.5 V, 0.30A, 5.0 W torch bulb working in the circuit as shown above. What is the combined resistance of R and B between the points X and Y ?
15. Two conducting wires A and B are made of same material. If the length of B is twice that of A and the radius of circular cross-section of A is twice that of B, then their resistances RA and RB are in the ratio
16. When an electric bulb breaks, what is the reason for a mild bang?
17. The product of conductivity and resistivity of a conductor
18. An electric iron of resistance 20 W takes a current of 5 A. The heat developed in joules in 30 s is
19. Consider the following statements :
1. If a piece of bar magnet is broken into two equally long pieces, the pieces will not lose the magnetic properties.
2. Magnetic properties of a substance lie in the atomic level. Which of the statements given above is/are correct ?
20. During short-circuiting, the current flowing in the electrical circuit
21. Which one of the following is correct? Lightning is formed, when
22. Which one among the following is the correct order of power consumption for light of equal intensity ?
23. The earth's magnetic field is approximately
24. A given conductor carrying a current of 1 A produces an amount of heat equal to 2000 J. If the current through the conductor is doubled, the amount of heat produced will be
25. The resistance of a wire of length l and area of cross-section a is x ohm. If the wire is stretched to double its length, its resistance would become:

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