Related Questions

The air we inhale is a mixture of gases which of the following gases is the mixture is highest in percentage
A Carbon dioxide
B Oxygen
C Ozone
D Nitrogen
A mixture contains 2/5 of element A and 3/5 of element B. When 5ml of A is added to the mixture, the proportion of B in the mixture changes to 1/5. What amount of A was originally present in the mixture before the addition was made ?
A 1ml
B 1.5ml
C 2.5ml
D 6ml
A jar contains a mixture of oil and water in the ratio 22 :3 . 50 litres of the mixture was taken out and 25 litres of water was added to it. If water was 34% in the resultant mixture, what was the initial quantity of the mixture (in litres ) in the jar?
A 175
B 150
C 75
D 125
For air conditioning the operation theater in a hospital, the percentage of outside air in the air supplied is
A Zero
B 20
C 50
D 100
Brass gets discoloured in air because of the presence of which of the following gases in air?
A Oxygen
B Hydrogen Sulphide
C Carbon dioxide
D Nitrogen
Air pressure is usually highest when the air is
A warm and moist
B cool and dry
C warm and dry
D cool and moist
A 140 liter mixture of milk and water contains 20% water. How much milk , in liter, must be added to the mixture so that the new mixture will contain a water and milk ratio of 1 : 7?
A 80 liter
B 84 liter
C 112 liter
D None of these
A fruit salad mixture consists of apples, peaches, and grapes in the ratio 6:5:2, respectively, by weight. If 39 pounds of the mixture is prepared, the mixture includes how many more pounds of apples than grapes?
A 15
B 12
C 9
D 6
A 180 liter mixture of milk and water contains 20% water. How much milk, in liters, must be added to the mixture so that the new mixture will contain water and milk in the ratio of 1 : 7?
A 100 liters
B 108 liters
C 144 liters
D 252 liters
A cement mixture is composed of 3 elements. Weight, 1/3 is water and the remaining 12 pounds of the mixture is gravel .What is the weight of the entire mixture in pounds?
A 60
B 80
C 90
D 180

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