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
Which one of the following is not necessarily the advantage of D.C. motors over A.C. motors?
A Low cost
B Wide speed range
C Stability
D High starting torque
Which one of the following elements is used as a timekeeper in atomic clocks?
A Potassium
B Caesium
C Calcium
D Magnesium
The material widely used for making pendulums of clocks is
A Stainless steel
B High speed steel
C Heat resisting steel
D Nickel steel
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
________ need frequent starting and stopping of electric motors,
A Paper mills
B Grinding mills
C Air-conditioners
D Lifts and hoists
The efficiencies of transformers compared with that of electric motors of the same power are
A about the same
B much smaller
C much higher
D somewhat smaller
In a simple circuit, one end of a conducting wire is attached to an electric cell, and the other end to an electric outlet
A battery
B faucet
C socket
D appliance
An electric toaster is an electric ..........
A Sort
B Kinkd
C goods
D appliance
Electric intensity at any point in an electric field is equal to the at that point.
A electric flux
B magnetic flux density
C potential gradient
D none of the above

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