Calculate the electric field intensity between two plates of potential difference 6.5V when separated by a distance of 35cm.
A. 18.57NC−¹ B. 53.06N C−¹ C. 2.28NC−¹ D. 0.80NC−¹ Correct Answer: Option A – 18.57NC−¹
The critical angle for light travelling from a transparent medium to air s measured as 34°. The refractive index of the medium is?
A. 0.56 B. 1.50 C. 1.79 D. 2.02 Correct Answer: Option C – 1.79 Explanation N = 1/sinθ = 1/sin34 = 1.79
A boy receives the echo of his clap reflected by a nearby hill 0.8s later. If the speed of sound in air is 3.40m/s; how far is he from the hill?
A. 66m B. 136m C. 264m D. 528m Correct Answer: Option B – 136m Explanation Distance = speed × time = (3400) × (0.812) = 136m
A solid weighs 45N and 15N respectively in air and water. Determine the relative density of the solid?
A. 0.33 B. 0.50 C. 1.50 D. 3.00 Correct Answer: Option D = 3.00 Explanation Weight in Air = 45N Weight in Water = 15N R.D = Weight in Air/Weight in water R.D = 45/15 = 3.00Products
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