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