281. In a conductor, if 1500 coulombs of charge enter and 1500 coulombs of charge exit in 5 minutes, what is the electric current? 300 Amperes 5 Amperes Zero 1 Ampere Answer: 5 Amperes 282. Two wires made of the same material have a length and radius ratio of 3:4 and 3:2 respectively, and are […]

261. Arrange the following in increasing order of their refractive index. Water, Kerosene, Glass, Diamond Kerosene, Water, Glass, Diamond Glass, Kerosene, Water, Diamond Water, Glass, Kerosene, Diamond Answer: Water, Kerosene, Glass, Diamond 262. How is the power of a lens related to its focal length? Directly proportional to f Directly proportional to 1/f Directly proportional

241. The magnetic field of a current-carrying solenoid is similar to _____. A bar magnet A resistor An electric motor An iron core Answer: A bar magnet 242. The AC supply in homes is 220 V, 50 Hz. One of the supply wires has red insulation, which is called Live wire Neutral wire Earth wire

221. The SI unit of potential difference is Ampere Volt Coulomb Joule Answer: Volt 222. 1 Ohm is equal to 1 Volt / 1 Ampere 1 Volt x 1 Ampere 1 Volt / 1 Ampere 1 Volt x (1 Ampere)² Answer: 1 Volt / 1 Ampere 223. If the length of a metal wire is

201. The image formed by a plane mirror is always Virtual and upright Real and inverted Virtual and inverted Real and upright Answer: Virtual and upright 202. The imaginary line passing through the center of curvature and the pole of a spherical mirror is called Principal center Principal axis Focal length Parallel ray Answer: Principal

161. The ability of the eye to focus on both near and distant objects while adjusting the focal length is called ________. Minimum distance of clear vision Nearsightedness Eye accommodation Farsightedness Answer: Eye accommodation 162. Two magnetic field lines Intersect at the midpoint Intersect near the north pole Never intersect each other Intersect near the

181. The northern end of a compass needle points approximately towards _____? North Pole South Pole Equator None of the above Answer: North Pole 182. The laws of reflection are true for _____? Only plane mirrors Only concave mirrors Only convex mirrors All reflecting surfaces Answer: All reflecting surfaces 183. For a spherical mirror with

141: A 10 V battery carries a charge of 20,000 C through a resistance of 20 Ω. The work done in 10 seconds is 2 x 10³ Joules 2 x 10⁴ Joules 2 x 10⁵ Joules 2 x 10² Joules Answer: 2 x 10⁴ Joules 142: Two devices are connected in parallel between points A

121: Which of the following is not attracted by a magnet? Steel Cobalt Brass Nickel Answer: Brass 122: When a straight conductor carries an electric current, Circular magnetic field lines surround it Magnetic field lines are parallel to the conductor There are no magnetic field lines None of the above Answer: Circular magnetic field lines

101: What is the primary source of energy? Water Sun Uranium Fossil fuels Answer: Sun 102: The radius of curvature of a spherical mirror is 20 cm. What is its focal length? 20 cm 10 cm 5 cm 40 cm Answer: 10 cm 103: You are given kerosene, turpentine, and water. In which of these