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197 questions found · practise this subject as a set Show 20 · 50 per page

#	Question	Subject and topic	Difficulty
1	What is the SI unit of electric charge?	Physics Electric charge and Coulomb’s law	Easy
2	A current of 2 A flows through a resistor of 10 Ω. What is the potential difference across it?	Physics Ohm’s law and resistance	Easy
3	What is the power of a convex lens of focal length 0.5 m?	Physics Lenses	Easy
4	Who explained the photoelectric effect using the idea of light quanta (photons)?	Physics Photoelectric effect	Easy
5	Two 4 Ω resistors are connected in parallel. What is the equivalent resistance?	Physics Cells, emf and internal resistance	Easy
6	What is the approximate speed of light in vacuum?	Physics Electromagnetic spectrum	Easy
7	What is the SI unit of magnetic field (magnetic flux density)?	Physics Biot-Savart law	Easy
8	Two point charges of 2 μC and 3 μC are placed 0.3 m apart in vacuum. The force between them is:	Physics Electric charge and Coulomb’s law	Easy
9	If the distance between two point charges is halved, the Coulomb force between them becomes:	Physics Electric charge and Coulomb’s law	Easy
10	How many electrons together carry a total charge of magnitude 1 C?	Physics Electric charge and Coulomb’s law	Medium
11	A glass rod rubbed with silk becomes positively charged because:	Physics Electric charge and Coulomb’s law	Medium
12	Two charges exert a force of 8 N on each other in air. When placed at the same separation in a medium of diel…	Physics Electric charge and Coulomb’s law	Hard
13	The electric field at a distance of 0.2 m from a point charge of 4 nC in vacuum is:	Physics Electric field and dipoles	Easy
14	An electric dipole of moment 2 × 10⁻⁸ C m is placed at 30° to a uniform field of 5 × 10⁴ N/C. The torque on i…	Physics Electric field and dipoles	Medium
15	A dipole placed in a uniform electric field experiences:	Physics Electric field and dipoles	Easy
16	At large distances, the electric field of a short dipole varies with distance r as:	Physics Electric field and dipoles	Medium
17	At the same large distance from a short dipole, the ratio of the axial field to the equatorial field is:	Physics Electric field and dipoles	Hard
18	A closed surface encloses a net charge of 8.85 nC. The total electric flux through it is about:	Physics Gauss’s theorem	Easy
19	The electric field inside a uniformly charged thin spherical shell is:	Physics Gauss’s theorem	Easy
20	A very long straight wire carries a uniform charge of 2 μC per metre. The field at 0.1 m from it is about:	Physics Gauss’s theorem	Medium