Related Questions

A man purchases two clocks A and B at a total cost of Tk 650. He sells A with a 20% profit and B at a loss of 25% and gets the same selling price for both clocks. What are the purchasing prices of A and B respectively? 
A 225, 425
B 275, 375
C 300, 350
D 250, 400
Clock pendulums are usually made of __________ steel.
A High speed
B Stainless
C Heat resisting
D None of these
Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a
A Cermet
B Glass
C Thermosetting plastic
D Metallic alloy
Which one of the following elements is used as a timekeeper in atomic clocks?
A Potassium
B Caesium
C Calcium
D Magnesium
Which of the following motors will be used in electric clocks ?
A D.C. shunt motor
B D.C. series motor
C A.induction motor
D A.C. synchronous motor
The gear train usually employed in clocks is a
A reverted gear train
B simple gear train
C sun and planet gear
D differential gear
This group of alumino-silicate minerals is widely used in making electrical insulators
A Bauxite
B Chromite
C Manganese
D Mica
Which of the following is the most widely used insulating material for steam carray-ing pipelines?
A Ceramic fibre blanket
B Glass wool and 85% magnesia
C Vermiculite
D Slag wool
Which of the following is the most widely used heat insulating material for pipelines carrying steam?
A Tar dolomite bricks followed by asbestos
B Fireclay refractory followed by aluminium sheet
C Cotton followed by aluminium foil
D 85% magnesia cement and glass wool
The instruction state that Sumi may need 4/9 square yards of one type of material and 2/3 square yards of another type of material for a project. She buys exactly that amount. After finishing the project, however, she has 8/18 square yards left that she did not use. What is the total amount of square yards of material Sumi used?
A 1/12
B 1/9
C 2/3
D 10/9

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