Related Questions

Given that, 24 carat gold is pure gold, 18 carat gold is 3/4th of pure gold and 20 carat gold is 5/6th of pure gold, the ratio of the pure gold in 18 carat gold to the pure gold in 20 carat gold is -
A 5 : 8
B 10 : 9
C 8 : 5
D 9 : 10
In a rare coin collection, all coins are either pure gold or pure silver , and there is initially one gold coin for every three silver coins . With the addition of 10 more gold coins to the collection, the ratio of gold coins to silver coins is 1 to 2. Based on this information , how many total coins are there now in this collection (after the acquisition)?
A 40
B 50
C 70
D 90
A certain dentist specializes in implanting gold and silver teeth in his patients mouths .He charges $ 650 for a gold tooth an $ 325. for a silver tooth. If his told fees for implanting gold and silver teeth last week were $ 15, 925 in total and he implanted five more gold teeth that silver teeth, how many teeth in total did he implant over the week?
A 33
B 32
C 31
D 34
Which one of the following gases dissolves in water to give acidic solution?
A Carbon dioxide
B Oxygen
C Nitrogen
D Hydrogen
Bitumen completely dissolves in
A Carbon bisulphide
B Chloroform
C Coal tar
D All of these
Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the
A Low pressure and high temperature
B Low pressure and low temperature
C High pressure and low temperature
D High pressure and high temperature
When the solvent dissolves very little of solute, then
A Solvent of low latent heat of vaporisation should be used
B Solvent of low freezing point should be used
C Large quantity of solvent is required to extract the solute
D Very small quantity of solvent is required
Which one of the following oxides dissolves in water?
A CuO
B Al2O3
C Fe2O3
D Na2O
কোন যৌগটি পানিতে সহজে দ্রবীভূত হয়ে গাঢ় সালফিউরিক এসিডের সাথে বাষ্পযুক্ত সাদা ধোঁয়া তৈরি করে এবং জলীয় সিলভার নাইট্রেট দ্রবণে সাদা অধঃক্ষেপ দেয়? (Which compound dissolves easily in water, form steamy white fumes with concentrated sulfuric acid and gives white precipitate with aqueous silver nitrate solution?)
A AgCl
B NaBr
C NaCl
D PbBr2
This necklace is made by gold. বাক্যে "gold" শব্দটি
A Proper noun
B Common noun
C Collective noun
D Material noun

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