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The base of a right pyramid is a square of side 10 cm. 4 rods with maximum possible length have been kept in the pyramid. The volume of the pyramid (without keeping the rods inside) is 400 cm3. The radius of the base of all the rods is 0.7 cm. What will be the approximate volume of the remaining part of the pyramid (when rods are kept inside the pyramid)?
Three rods, one made of silver (l = 420W/m K), second made of aluminum (k = 210W/m K) and the third made of iron (k = 70W/m K) are coated with a uniform layer of wax all around. The rods are placed vertically in a boiling water bath with 250 mm length of each rod projecting outside. If all the rods are having following dimensions i.e. diameter = 15 mm and length = 300 mm and have identical surface coefficient 12.5W/ m2 K, work out the ratio of lengths up to which wax will melt on each rod
Which of the following are percussion drills? (i) Shot drill (ii) Diamond drill (iii) Wagon drill (iv) Churn drill
Which of the following are percussion drills?
(i) Shot drill
(ii) Diamond drill
(iii) Wagon drill
(iv) Churn drill
Read the given statements and conclusions carefully. Assuming that the information given in the statement is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statements. Statements: No boat is ship. Some ships are rods. Conclusions: I. No boat is rod. II. Some rods are ships. III. Some rods are not boats.
Statements : All rods are bricks. Some bricks are ropes. All ropes are doors.

Conclusions :
I. Some rods are doors.
II. Some doors are bricks.
III. Some rods are not doors.
IV. All doors are ropes.
________________ are Steel bits which are screwed to the ends of drill rods and they can be attached to or removed from the drill steel.
Distance between the table and drill is_____ in pillar drill machine as compare to table top drill machine.
If l=length of travel of the drill in mm, n=rpm of the drill, s= feed per revolution of the drill in mm. Then machining time can be given as_____
If t=2minute, n=2rpm and s=5 mm. Then find the value of l. t=machining time in minute, l=length of travel of the drill in mm, n= rpm of the drill and s=feed per revolution of the drill in mm.