Question bank

Filter questions by subject, topic and difficulty. Open any question to answer it and see the explanation.

7,992 questions found Show 20 · 50 per page

#	Question	Subject and topic	Difficulty
4881	The angle between electric field lines and an equipotential surface is always:	Physics Electric potential	Medium
4882	The electrostatic potential energy of charges 1 μC and 2 μC kept 0.1 m apart in vacuum is:	Physics Electric potential	Medium
4883	At the midpoint of the line joining two equal and opposite charges, which statement is correct?	Physics Electric potential	Hard
4884	Inside a charged metal conductor in electrostatic equilibrium, the electric field is:	Physics Conductors, dielectrics and polarisation	Easy
4885	Excess charge given to an isolated conductor resides:	Physics Conductors, dielectrics and polarisation	Easy
4886	When a dielectric slab is placed in an external electric field, the field inside the slab:	Physics Conductors, dielectrics and polarisation	Medium
4887	Which of the following molecules is polar?	Physics Conductors, dielectrics and polarisation	Medium
4888	A person sitting inside a closed metal car is safe from a lightning strike mainly because of:	Physics Conductors, dielectrics and polarisation	Hard
4889	Capacitors of 2 μF and 3 μF are connected in series. The equivalent capacitance is:	Physics Capacitors	Easy
4890	The energy stored in a 10 μF capacitor charged to 100 V is:	Physics Capacitors	Easy
4891	A parallel plate capacitor has plates of area 0.02 m² separated by 1 mm of air. Its capacitance is about:	Physics Capacitors	Medium
4892	The space between the plates of an air capacitor is completely filled with a dielectric of constant 5. Its ca…	Physics Capacitors	Medium
4893	A capacitor is charged by a battery and then disconnected. If the plate separation is now doubled, the stored…	Physics Capacitors	Hard
4894	A steady current of 2 A flows in a wire for 5 minutes. The charge that passes through any cross-section is:	Physics Electric current and drift velocity	Easy
4895	A copper wire of cross-section 1 mm² carries 1.5 A. If n = 8.5 × 10²⁸ m⁻³, the drift speed of electrons is ab…	Physics Electric current and drift velocity	Medium
4896	The SI unit of electron mobility is:	Physics Electric current and drift velocity	Medium
4897	A bulb lights up almost instantly when switched on, although the drift speed of electrons is very small. This…	Physics Electric current and drift velocity	Easy
4898	A steady current flows through a wire whose radius at end X is twice the radius at end Y. The ratio of drift …	Physics Electric current and drift velocity	Hard
4899	The resistance of a copper wire of length 10 m and cross-section 1 mm² (ρ = 1.7 × 10⁻⁸ Ω m) is:	Physics Ohm’s law and resistance	Easy
4900	A uniform wire is stretched to twice its original length. Its resistance becomes:	Physics Ohm’s law and resistance	Medium