Physics questions with answers

2,629 multiple-choice questions. Open any question for its answer and explanation.

Questions asked in State PSC and UPSC prelims, by topic. Each topic also has notes to read.

Read the notes: Electric Current →

1. Current density isAsked in BPSC Prelims Exam 69th
2. Which one of the following statements is not correct?Asked in UPSC CDS 1 2017 · UPSC CDS 1 2022
3. Which one of the following laws of electromagnetism does not give the direction of magnetic field ?Asked in UPSC CDS 1 2021
4. The magnetic field lines inside a current carrying long solenoid are in the form ofAsked in UPSC CDS 2 2021
5. A charged particle moves through a magnetic field B with a velocity v. Which one of the following statements is true for the force (F) experienced by the particle?Asked in UPSC CDS 2 2023
6. In a region, the electric potential varies as shown in the figure. Which one among the following is the correct representation of the magnitude of the associated electric field ?Asked in UPSC Geoscientist 2024
7. Consider metallic spheres of different radii r, all at the same electrostatic potential. Then the magnitude E of the electric field just outside these spheres depends on r as :Asked in UPSC Geoscientist 2024
8. Magnetic dipole moment of a square current loop of side 1 cm and carrying a current of 0.10 A is :Asked in UPSC Geoscientist 2024
9. A small metallic sphere is held in a non- uniform electrostatic field as shown in the figure. Also shown are two points P and Q on the surface of the sphere. Which one of the following statements is true for the sphere?Asked in UPSC Geoscientist 2024
10. Which of the following statement/s is/are correct regarding the electric current used in appliances used in your home? i. Microwave oven and Television use DC current. ii. Refrigerator and Washing machine use AC current. iii. Air cooler and Air conditioner use AC current. iv. Most appliances use 220 Ampere current. v. The amount of current flowing through different appliances is the same.Asked in HAS Prelims 2021
11. Consider the following statements: Statement - I : Magnetic field lines emerge from the North pole of a bar magnet and merge into the South pole of the bar magnet. Statement - II : The direction of the magnetic field is considered to be the direction along which the North pole of a compass needle moves within that field. Statement - III : Inside the bar magnet, there is no magnetic field. Statement - IV : The relative strength of the magnetic field is shown by the degree of closeness of the field lines. Which of the above statements are correct?Asked in HAS Prelims 2021
12. Consider the following statements: Statement - I : An electric motor converts electrical energy into mechanical energy. Statement - II : An electric generator converts mechanical energy into electrical energy. Statement - III : Both electric motor and generator work on the same principle. Which of the above statements are correct?Asked in HAS Prelims 2021
13. Which of the following is (are) true in respect of the electric current used at your home? i. Microwave Oven and television uses dc current ii. Refrigerator and washing machine uses ac current iii. Air cooler and air conditioner uses ac current iv. Most of the devices use 220 ampere current v. Magnitude of current passing through different devices is sameAsked in HAS Prelims 2021
14. Suppose a rod is given a negative charge by rubbing it with wool. Which one of the following statements is correct in this case ?Asked in UPSC NDA 1 2017
15. A current of 1·0 A is drawn by a filament of an electric bulb for 10 minutes. The amount of electric charge that flows through the circuit isAsked in UPSC NDA 1 2021
16. The frequency of an alternating current is 3 Hz. It implies thatAsked in UPSC NDA 1 2022
17. If the current through an electrical machine running on direct current is 15 A and the machine runs for 10 minutes, the charge that passes through the machine during this time is :Asked in UPSC NDA 1 2024
18. Two long wires each carrying a d.c. current in the same direction are placed close to each other. Which one of the following statements is correct?Asked in UPSC NDA 2 2015
19. Which one of the following statements regarding cathode rays is not correct ?Asked in UPSC NDA 2 2019
20. Which one of the following statements regarding magnetic field is NOT correct ?Asked in UPSC NDA 2 2020
21. A current of 0·6 A is drawn by an electric bulb for 10 minutes. Which one of the following is the amount of electric charge that flows through the circuit?Asked in UPSC NDA 2 2022
22. Lightning is due toAsked in UPSC NDA 2 2024
23. Consider a tightly wound 100 turn coil of radius 10 cm, carrying a current of 1A. What will be the magnitude of the magnetic field at the centre of the coil ?Asked in UKPSC CS Prelims 2024
24. Directions : The following eight (8) items consist of two statements, Statement I and Statement II. Examine these two statements carefully and select the correct answer using the code given below. Code : Statement I : A compass needle placed near a current-carrying wire will get deflected. Statement II : A current-carrying wire creates magnetic field around it.Asked in UPSC CAPF 2018
25. Let an electric current of 1.5 A flow through an incandescent lamp in a circuit. What is the amount of charge that flows through it in 10 ms?Asked in UPSC CAPF 2021