Related Questions

নিচের কোনটি শিখা পরীক্ষা (flame test ) (colour ) প্রদান করে না ?
A    K+
B Ca+
C  Cu2+
D     Mg2+
Actual flame temperature is always lower than the adiabatic flame temperature, because there is
A No possibility of obtaining complete combustion at high temperature
B Always loss of heat from the flame
C Both A & B
D Neither A nor B
The maximum adiabatic flame temperature in air is __________ the maximum flame temperature in pure oxygen.
A Lower than
B Higher than
C Same as
D Not related to
The maximum adiabatic flame temperature of fuels in air is __________ the maximum flame temperature in pure oxygen.
A Lower than
B Higher than
C Same as
D Not related to
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
Colour imparted to the Bunsen flame by strontium salt is
A Bluish green
B Apple-green
C Brick red
D Crimson red
The colour of the flame of halide torch, in case of leakage of Freon refrigerant, will change to
A Bright green
B Yellow
C Red
D Orange
Which according to WHO is the acceptance level of arsenic?
A 0.005 milligram/liter
B 0.05 milligram/liter
C 0.001 milligram/liter
D 0.01 milligram/liter
What is the acceptable safe limit of Arsenic per litter of water ?
A 0.01 mg
B 0.001 mg
C 0.20 mg
D 0.02 mg
The most suitable pair of words that can be substituted is the blanks: Throughout Bangladesh. thousands of tube wells have tested------for Arsenic and have been declared----for human consumption.
A Contaminated-----precarious
B affirmative-----risky
C positive------unsafe
D new------unsuitable

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