50) The base of a right angle triangle is 10 and the height is 20. What is the area?

51) A standard hack saw blade of 300 mm length has 375 teeth. What is the classification and type of set of the blade?

52) Find out the speed setting (rpm) for a high speed steel drill D24 to cut a work piece of phosphor bronze. Maximum cutting speed with HSS for Phosphor Bronze is 35 m/min.

53) What is the clearance angle if the angle of inclination of a chisel, with point angle 60 degree, is 39.5 degree?

54) In a vernier caliper, 100 divisions of the vernier scale occupies x divisions (mm) of the main scale. Find out the value of x if the least count of the vernier scale is 0.01 mm.