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