Q. 105: Which of the following substances is not used to make lenses?
The correct answer was: Water
Q. 102: The radius of curvature of a spherical mirror is 20 cm. What is its focal length?
The correct answer was: 10 cm
Q. 113: Calculate the total resistance in the circuit. Given: R₁ = 10 Ω, R₂ = 40 Ω, R₃ = 30 Ω, R₄ = 20 Ω, R₅ = 60 Ω, and V = 12 V.
The correct answer was: 25 Ω
Q. 111: The SI unit of resistivity is
The correct answer was: Ohm per meter
Q. 107: The filament of an electric bulb is made of which element?
The correct answer was: Tungsten
Q. 106: The resistance of a cylindrical conductor with length l and uniform cross-sectional area A is R. What is the cross-sectional area of the same material with length 2l and resistance R?
The correct answer was: 2A
Q. 108: An electric bulb is connected to a 220 V generator. The current is 0.5 A. What is the power of the bulb?
The correct answer was: 110 W
Q. 101: What is the primary source of energy?
The correct answer was: Sun
Q. 112: The potential difference across the terminals of an electric heater is 60 V when it draws a current of 4 A from the source. If the potential difference is increased to 120 V, how much current will the heater draw?
The correct answer was: 8 A
Q. 104: A convex lens forms a real and inverted image of a needle at a distance of 50 cm from it. Where is the needle placed in front of the convex lens if the image is the same size as the object?
The correct answer was: + 0.5 m
Q. 109: Which element’s atoms have only two energy levels?
The correct answer was: Magnesium
Q. 120: The focal length of the eye lens changes due to:
The correct answer was: Ciliary muscles
Q. 103: You are given kerosene, turpentine, and water. In which of these does light travel the fastest? (Given: refractive indices of kerosene, turpentine, and water are 1.44, 1.47, and 1.33 respectively)
The correct answer was: Water
Q. 118: An object of length 5 cm is placed at a distance of 25 cm from a converging lens with focal length f. An image is formed at 16.67 cm on the other side of the object. The value of f is:
The correct answer was: +10 cm
Q. 117: Which type of mirror is used in a solar furnace?
The correct answer was: Concave
Q. 116: Where should an object be placed in front of a convex lens to obtain a real image of the same size as the object?
The correct answer was: At twice the focal length
Q. 119: The far point and near point of the human eye with normal vision are respectively:
The correct answer was: Infinity and 25 cm
Q. 110: Which of the following mirrors is used by a dentist to examine a small cavity?
The correct answer was: Concave mirror
Q. 114: A student wants to extract energy from fossil fuel. Which process will help her in extracting energy from fossil fuel?
The correct answer was: Combustion
Q. 115: How are three resistors of resistances 2Ω, 3Ω, and 6Ω connected to give a total resistance of 4Ω?
The correct answer was: 3Ω and 6Ω resistors are connected in parallel, and this combination is connected in series with the 2Ω resistor.
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