1045. The most suitable material for a sewer for carrying storm water is
A. Asbestos cement
B. Cast iron
C. Mild steel
D. Cement concrete
✅ The correct answer is option D.
1047. Property responsible for the talcum powder to cling to the skin is the
A. Capillary action
B. Adhesion
C. Cohesion
D. Surface tension
✅ The correct answer is option B.
1051. Ignition of fuel in a diesel engine is by
A. Spark
B. Hot compressed air
C. Fuel injection
D. None of these
✅ The correct answer is option B.
1014. With increase in compression ratio, the volumetric efficiency of air compressor
A. Increases
B. Decreases
C. Remains same
D. May increase or decrease (depends on the suction pressure)
✅ The correct answer is option A.
1017. Silicon percentage in acid resistant cast iron is about
A. 4
B. 8
C. 14
D. 20
✅ The correct answer is option A.
1020. Air standard Otto cycle is more efficient than the diesel cycle for the same
A. Heat addition & compression ratio
B. Heat addition & pressure
C. Compression ratio & pressure
D. Cylinder dimension & rpm
✅ The correct answer is option A.
1023. Toughness of a material is measured by the
A. Vicker’s hardness test
B. Scratch test
C. Universal testing machine
D. Notched bar test
✅ The correct answer is option C.
1026. Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C.
A. 597
B. 959
C. 1147
D. 1493
✅ The correct answer is option D.
1029. Co-efficient of performance of a Carnot cycle refrigerator operating between – 23°C and + 27°C is
A. 3
B. 5
C. 0.5
D. 1.5
✅ The correct answer is option B.