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  1. If the image formed by a convex mirror of focal length 30 cm is a quarter of the size
  2. A 2 kg mass starts from rest on an inclined smooth surface with inclination
  3. A spring gun of spring constant 90 N/cm is compressed 12 cm by a ball of mass
  4. The e.m.f. of a battery is 2 V and its internal resistance is 0.5 Ω. The maximum
  5. A ray enters a glass sphere of refractive index μ=√3 at an angle of incidence of 60⁰