Q. 65: The value of ‘g’ is maximum
The correct answer was: At the poles
Q. 66: Which of the following materials is not used in making lenses?
The correct answer was: Water
Q. 61: At a temperature of 20°C, the minimum distance a person must be to hear an echo is
The correct answer was: 34.4 meters
Q. 77: According to Snell’s law
The correct answer was: μ = sin i / sin r
Q. 62: When converting low pitch sound to high pitch sound, we increase
The correct answer was: Frequency
Q. 64: Which of the following relationships is correct?
The correct answer was: g = GM/R²
Q. 67: Which lens would you use to read a dictionary?
The correct answer was: Convex lens with focal length of 50 cm
Q. 80: When light travels from one medium to another, the change in its path is called
The correct answer was: Refraction of light
Q. 79: The power of a lens is
The correct answer was: P = 1/f
Q. 78: The distance between the principal focus and the pole of a mirror is called
The correct answer was: Focal length
Q. 76: The formula for the power of a lens is
The correct answer was: m.s⁻¹
Q. 63: The value of ‘g’ on the surface of the Moon is
The correct answer was: Less than on the Earth’s surface
Q. 70: The image of an object is formed on the
The correct answer was: Retina
Q. 71: The mirror in a vehicle produces magnification
The correct answer was: More than one
Q. 72: If your reflection appears upright in a mirror, the mirror is
The correct answer was: Plane
Q. 73: Which part of the eye is donated after death?
The correct answer was: Cornea
Q. 68: The lens formula is
The correct answer was: 1/v + 1/u = 1/f
Q. 69: The minimum distance for clear vision for a normal person is
The correct answer was: 25 cm
Q. 74: The image formed on the retina is
The correct answer was: Real and inverted
Q. 75: Which of these is the mirror formula?
The correct answer was: 1/v – 1/u = 1/f
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