A man exerts a pressure of 2.8 x 10³Nm‾² on the ground and has 4 x 10−²m² of his feet in contact with the ground. The weight of the man is?
A. 102N B. 70N C. 140N D. 112N Correct Answer: Option D – 112N Explanation Pressure = Force / Area = Weight of the man / Area of his feet => 2.8 x 103 = Weight of the man / 4 x 10-2 ∴ Weight of the man = 2.8 x 103 x 4 x 10-2 =...
Transverse waves can be distinguished from longitudinal waves using the characteristic of?
A. diffraction B. refraction C. polarization D. reflection Correct Answer: Option C = polarization
Metal rods of length 20m each are laid end to end to form a bridge at 25°C. What gap will be provided between consecutive rails for the bridge to withstand 75°C? [Linear expansivity of the material = 2.0 x 10^-5K‾¹]
A. 0.20m B. 0.22m C. 0.25m D. 0.02m Correct Answer: Option D = 0.02m Explanation Safety gap = expansion of the rod = α×L0×Δtα×L0×Δt where αα = linear expansivity of the material L0L0 = Initial length of the material ΔtΔt = Change in temperature ∴∴ The safety gap...
A 50W electric heater is used to heat a metal block of mass 5kg. If in 10 minutes a temperature rise of 12°C is achieved; the specific heat capacity of the metal is?
A. 400 J kg-1K-1 B. 500 J kg-1K-1 C. 390 J kg-1K-1 D. 130 J kg-1K-1 Correct Answer: Option B – 500 J kg-1K-1 Explanation Heat supplied by the heater in 10 mins = power x time = 50 x (10 x 60) = 30000 J This heat is equal = MCΔt = 5 x c x 12 = 60cJ = 60C = 30,000...Products
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