573. In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

A. T = 15 – 0.0065 h
B. T = 15 + 0.0065 h
C. T = 0.0035 h – 15
D. T = 15 – 0.0035 h
✅ The correct answer is option A.

576. Which of the following is not the function of a volute casing provided in a centrifugal pump?

A. To reduce the head loss in discharge
B. To increase the pump efficiency
C. To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity
D. To increase the pump discharge rate
✅ The correct answer is option D.

579. Pick out the correct combination about the role of various additives used in polymers.

A. Plasticiser : increases the polymer strength
B. Heat stabiliser : increases the maximum service temperature
C. Fillers: Does not affect the property of polymer but increases its weight
D. Lubricants: increases the flexibility of polymers
✅ The correct answer is option C.