Related Questions

A garments factory employs 3 categories of workers K, M and N. The efficiency of the 3 categories of workers to do a specific task is in the ratio of 3 : 5 : 6 respectively and the factory employs 15 of category K, 12 of category M and 3 of category N. If the total wages paid to the entire group of 30 workers is Tk. 492 per hour, what will be the wages earned by a category N worker for an 8-hour day?
A Tk. 144
B Tk. 72
C Tk. 192
D Tk. 576
Calorific value of coal middling generated in coal washeries during washing of coal may be around __________ Kcal/kg.
A 1000
B 4000
C 6000
D 8000
At a Luncheon table where 20 men are seated, one -half of then men belong to club A, one -fourth belong to club B and one-tenth to both clubs , how many men belong to neither?
A 3
B 5
C 7
D 6
Presence of carbonaceous matter in the sewage
A Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures
B Reduces sulphate ions to sulphides causing obnoxious smell
C Increases the quantity of chlorine used for its purification
D All of the above
A machine can produce 10 units in 5 hours. Another machine can produce 5 units in 10 hours. Working together, how many units can they produce in 30 hours?
A 50 units
B 60 units
C 70 units
D 80 units
In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced.
A Concentrate
B Tailing
C Middling
D None of these
A coal containing very high percentage of durain is called __________ coal.
A Bright
B Splint
C Non-banded
D Boghead
The type of igneous rocks which are formed midway between volcanic and plutonic rocks, are known as ________
A Basalt
B Hypabyssal
C Laccolith
D Batholith
In which type of rocks are coal and petroleum found?
A Granite
B Igneous
C Metamorphic
D Sedimentary
Marble comes under which category of rocks?
A Sedimentary
B Igneous
C Metamorphic
D None of these

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