Related Questions

The density of a gas 'X' is twice that of another gas 'Y'. If the molecular weight of gas 'Y' is 'M'; then the molecular weight of the gas 'X' will be
A 2M
B $$\frac{{\text{M}}}{2}$$
C M
D $$\frac{{\text{M}}}{4}$$
দুটি এক-পরমাণুক আদর্শ গ্যাস পরস্পরের সাথে তাপীয় সাম্যাবস্থায় আছে। A গ্যাস m ভরের অণু দ্বারা গঠিত, এবং B গ্যাস 4m ভরের অণু দ্বারা গঠিত। A গ্যাসের আয়তন ৪ গ্যাসের আয়তনের দ্বিগুণ। এদের চাপের অনুপাত PA / PB কত? (Two monoatomic ideal gases are in thermal equilibrium with each other. Gas A is composed of molecules with mass m while gas B is composed of molecules with mass 4m. The volume of gas A is twice that of gas B. What it the ratio of their pressures PA / PB ?)
A 1/4
B 1/2
C 1
D 2
In a new production process, the number of units produced during the first week was 450. If the efficiency gradually increase so that 10 additional units can be produced each week, how many will be produced in the 10th week?
A 490
B 700
C 540
D 640
If a gas metal arc process uses a low arc voltage and the arc is continuously interrupted as the molten electrode metal fills up the arc gap is known as
A ARC
B Short ARC
C ARC length
D ARC blow
In a metal arc welding process, a gas metal arc welding with magnetized flux is used and can be done in all the positions i.e. flat position, vertical position or inclined position.
A Globular transfer
B Spray transfer
C GMAW practice
D Dip transfer
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has
A Higher calorific value
B Lower hydrogen content
C Both A & B
D Neither A nor B
Which of the following metals reacts vigorously with cold water?
A Potassium
B Aluminium
C Zinc
D Iron
The compound of Portland cement which reacts immediately with water and also sets first is
A Tri-calcium silicate
B Di-calcium silicate
C Tri-calcium aluminate
D Tetra calcium alumino ferrite
Which of the following metals reacts violently with water ?
A Mercury
B Sodium
C Calcium
D Magnesium
পরীক্ষাগারে সাধারণত কোন যৌগকে পানির সাথে বিক্রিয়া করে ইথাইন প্রস্তুত করা যায়? (Which of the following compound reacts with water to produce ethyne?)
A Ca(COOH)2
B CaO
C CaC2
D CaCl2

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