A. radio-waves B. gamma rays C. infrared waves D. ultraviolet rays Correct Answer: Option A A. radio-waves
A. diverging B. converging C. plano-convex D. converging meniscus Correct Answer: Option A A. diverging
A. between principal focus and pole B. between principal focus and centre of curvature C. at infinity D. at centre…
A. periscope B. sextant C. kaleidoscope D. binoculars Correct Answer: Option D D. binoculars
A. polarisation B. dispersion C. diffraction D. reflection Correct Answer: Option C C. diffraction
A. 5.0m B. 40.0m C. 50.0m D. 80.0m Correct Answer: Option D D. 80.0m Explanation λ = v/f = 20/0.25=80
A. temperature B. wind C. the amount of water vapour in the atmosphere D. atmospheric pressure Correct Answer: Option D…
A. 1500J B. 10000J C. 10500J D. 15000J Correct Answer: Option C C. 10500J Explanation Q = ML + Cθ…
A. mass 100kg the temperature rises by 1k B. mass 1kg, the temperature by 1000K C. mass 1kg, the temperature…
A. silvered surfaces B. vacuum within the doubled walls C. plastic stopper D. cork support Correct Answer: Option A A.…