Calculate the heat energy required to vaporize 50g of water initially at 80ºC if the specific heat capacity of water is 4.23jg¯¹k¯¹ (specific latent heat of vaporization of water is 2260jg¯¹
A. 530000J B. 23200J C. 17200J D. 130000J Correct Answer: Option D = 130000J Explanation H = mc△θ + mL H = ? m = 50g, c = 4.23J/gk,L = 2260, △θ = 80ºC H = 50 [4.23 x 80 + 2260] = 129920 ≈...
Which of the following is not a vector quantity _____?
A. momentum B. force C. temperature D. displacement Correct Answer: Option C = temperature Explanation displacement, velocity, and acceleration, linear momentum, force are vector quantities, while speed (the magnitude of velocity), time, and mass are scalars. To...
A boy standing some distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms‾¹, how far is he from the cliff?
A. 680m B. 170m C. 34m D. 85m Correct Answer: Option D = 85m Explanation V = 2d/t v = 340ms−1 t = 0.5s d= ? d = 2d/2=340×0.52 = 85m
A source of sound produces waves in air of wavelength 1.65m. If the speed of sound in air is 330ms‾¹, the period of vibration in air is?
A. 200 B. 0.005 C. 0.5 D. 0.02 Correct Answer: Option B = 0.005 Explanation V = λ/T : v = 330ms−1 λ = 1.65m T = ? 330 = 1.65/T T = 1.65/330 = 0.005s
Which of the following instruments may be used to measure relative humidity?
A. Hydrometer B. Manometer C. Hygrometer D. Hypsometer Correct Answer: Option C = Hygrometer Explanation A hygrometer is an instrument that is used to measure water vapor in the atmosphere. This is also commonly referred to as relative humidity in the...Products
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