241. The magnetic field of a current-carrying solenoid is similar to _____.

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

Answer: Live wire

243. The phenomenon of electromagnetic induction is

Answer: Generating induced electric current in a coil due to relative motion between a magnet and the coil

244. During a short circuit, the electric current in the circuit

Answer: Greatly increases

245. The device used to generate electric current is called

Answer: Generator

246. The safety device used for circuit protection from short circuits is

Answer: A fuse

247. The direction of electric current is taken as

Answer: Opposite to the direction of electron flow

248. A piece of wire with resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, what is the ratio of R/R’?

Answer: 25

249. Which of the following is not a traditional source of energy?

Answer: Nuclear energy

250. Which of the following is a non-traditional source of energy?

Answer: Solar energy

251. Which of the following phenomena cannot be explained with the concept that light always travels in a straight line?

Answer: Diffraction

252. The image created by a plane mirror

Answer: Will be the same size as the object and laterally inverted

253. What will be the nature of the image obtained from the outer raised surface of a spoon, and which type of mirror can it be considered close to?

Answer: Upright and convex mirror

254. An object placed at an infinite distance creates a clear and bright image on a screen placed at a distance ‘x’ from a concave mirror. Then ‘x’ is equal to

Answer: The focal length of the mirror

255. Choose the correct option regarding the nature and distance of the image formed by a plane mirror.

Answer: Virtual, upright, and at the same distance as the object behind the plane mirror

256. Where should an object be placed to obtain a virtual image through a concave mirror?

Answer: Between the principal focus and the pole

257. To obtain a powerful parallel beam of light in vehicle headlights, _____ is used.

Answer: Concave mirror

258. What type of mirror is used to always obtain a virtual and upright image?

Answer: A) and B) both

259. If the magnification m = +1.5, then

Answer: The size of the image > the size of the object, real image

260. A pencil partially submerged in water appears to be displaced at the air-water interface; what is this due to?

Answer: Refraction

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