A person of mass 60 kg stands on a weighing scale in an elevator accelerating upward at 2 m/s² (g=10). The reading is
A. 120 kg
B. 60 kg
C. 72 kg
D. 48 kg
Answer: Option C
Solution (By JKSSB Mock Tests)
Apparent weight = m(g+a) = 60×(10+2) = 720 N, which corresponds to 72 kg mass on scale (if scale calibrated in kg under g=10). Reading 72 kg. Downward acceleration would reduce.
Explanation:
Rainbow is formed by dispersion, refraction, and internal reflection of sunlight in water droplets. Two refractions and one internal reflection give primary bow. Secondary bow has two internal reflections. Not diffraction.
Explanation:
Convex mirror diverges light, forms virtual, erect, diminished image behind mirror for any object position. Focal length positive by sign convention but image always virtual (upright). Used in rear-view mirrors.
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