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
Answer: 2 x 10⁴ Joules
142: Two devices are connected in parallel between points A and B. The physical quantity that remains the same between the two points is
Answer: Voltage
143: Calculate the electric current in a 10 Ω resistor in the following circuit.
Answer: 1.2 A
144: If the resistances of 40 W and 60 W filaments operating at 220 V are R1 and R2 respectively, then
Answer: R2 < R1
145: What is the maximum resistance that can be obtained using five resistors of 1/5 Ω each?
Answer: 10 Ω
146: When light rays enter the eye, most of the refraction occurs at
Answer: Outer surface of the cornea
147: When white light enters a glass prism from air, the angle of deviation is minimum for
Answer: Red light
148: The minimum resistance obtained by using 2Ω, 4Ω, 1Ω, and 100Ω is
Answer: < 1 Ω
149: The energy-efficient device for producing light is
Answer: CFL
150: If n resistors each of resistance R are connected in parallel, their equivalent resistance is
Answer: R/n
151: The focal length of a convex mirror with a radius of curvature of 22 cm is
Answer: 11 cm
152: The speed of light in vacuum is
Answer: 3×10⁸ m/s
153: When an object is placed between the focal point F and the optical center O of a convex lens, the size of the image is
Answer: Larger
154: The ratio of the height of the image to the height of the object is called
Answer: Magnification
155: If the specified lens has a power of +2D, the lens is
Answer: A convex lens with a focal length of +0.5 m
156: Which of the following is not an example of a biomass energy source?
Answer: Nuclear
157: Which of the following is a non-conventional energy source?
Answer: Solar energy
158: Dead organisms transform into natural gas in the
Answer: Absence of air
159. Solar cells are made of _______.
Answer: Silicon
160. Tidal energy is produced from ______.
Answer: Water flow