Water of mass 120g at 50°C is added to 200g of water at 10°C and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]
A. 60°C B. 40°C C. 25°C D. 10°C Correct Answer: Option C C. 25°CThe silver coating on the inside of a vacuum flask reduces heat loss by?
A. conduction B. radiation C. condensation D. convention Correct Answer: Option B B. radiationThe ice and steam points of a certain thermometer are -20°C and 100°C respectively. Calculate the Celsius temperature corresponding to 70°C on the thermometer
A. 84.0° B. 75.0° C. 64.0° D. 58.0° Correct Answer: Option B Explanation (70−20)/(100−20) = (θ−0)/(100−0) θ = (90×100)/120 = 75°CWhich of the following actions will improve the efficiency of the pulley system?
A. reducing the mass of the pulley B. increasing the friction force between the string and the pulley C. increasing the mass per unit length of the string of the pulley D. increasing the mass of the pulley Correct Answer: Option A A. reducing the mass of the...A block and tackle system has 6 pulleys. If the efficiency of the machine is 60%, determine its mechanical advantages.
A. 12.0 B. 10.0 C. 3.6 D. 1.8 Correct Answer: Option C C. 3.6 Explanation M.A = (Z×V.R)/100 = (60×5)/100 =3.6Products
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