Physics-
General
Easy
Question
In the following figure, the value of resistor to be connected between C and D so that the resistance of the entire circuit between A and B does not change with the number of elementary sets used is
- R
- 3R
The correct answer is:
Let the resistance connected between C and D be 
; then
and the resistance of entire circuit between A and B does not change with the number of elementary sets used.
or 
\ 
or 
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Figure shows three resistor configurations R1,R2 and R3 connected to 3 V battery. If the power dissipated by the configuration R1 R2 and R3 is P1,P2 and P3, respectively, then (figure) :
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II)
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In the given circuit, the voltmeter records 5 V. The resistance of the voltmeter (in ohms) is :
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Chemistry-
The properties such as boiling point, freezing point and vapour pressure of a pure solvent change when solute molecules are added to get homogeneous solution. These are called colligative properties. Applications of colligative properties are very useful in day-to-day life. One of its examples is the use of ethylene gal/Col and water mixture as anti-freezing liquid in the radiator of automobiles.
A solution M is prepared by mixing ethanol and water. The mole fraction of ethanol in the mixture is 0:9:
Given: Freezing point depression constant of' water ( 
for water) 
Freezing point depression constant of ethanol 
for ethanol) 
Boiling point elevation constant of ethanol ( 
for ethanol) 
Standard freezing point of water = 273 K
Standard freezing point of ethanol: 155.7 K
Standard boiling point of water = 373 K
Standard boiling point of ethanol 351.5 K
Vapour pressure of pure water 32.8- mm Hg
Vapour pressure of pure ethanol = 40 mm Hg
Molecular weight of water = 18 g 
Molecular weight of ethanol = 46 g
In answering the following questions, consider the solutions to be ideal dilute solutions and solutes, to be non-volatile and non-dissociative.
Water is Added the solution M such that the mole fraction of water in the solution becomes 0.9 the boiling point of this solution is :
The properties such as boiling point, freezing point and vapour pressure of a pure solvent change when solute molecules are added to get homogeneous solution. These are called colligative properties. Applications of colligative properties are very useful in day-to-day life. One of its examples is the use of ethylene gal/Col and water mixture as anti-freezing liquid in the radiator of automobiles.
A solution M is prepared by mixing ethanol and water. The mole fraction of ethanol in the mixture is 0:9:
Given: Freezing point depression constant of' water ( for water)
Freezing point depression constant of ethanol for ethanol)
Boiling point elevation constant of ethanol ( for ethanol)
Standard freezing point of water = 273 K
Standard freezing point of ethanol: 155.7 K
Standard boiling point of water = 373 K
Standard boiling point of ethanol 351.5 K
Vapour pressure of pure water 32.8- mm Hg
Vapour pressure of pure ethanol = 40 mm Hg
Molecular weight of water = 18 g
Molecular weight of ethanol = 46 g
In answering the following questions, consider the solutions to be ideal dilute solutions and solutes, to be non-volatile and non-dissociative.
Water is Added the solution M such that the mole fraction of water in the solution becomes 0.9 the boiling point of this solution is :
Chemistry-General
Chemistry-
The solutions which boil at constant temperature like a pure liquid and possess same composition in liquid as well as vapour state are called azeotropes. The components of azeotropes cannot be separated by fractional distillation. Only non-ideal solutions form azeotropes. Solutions with negative deviation form maximum boiling azeotrope and the solutions with positive deviation form minimum boiling azeotrope. Boiling poin't of an azeotrope is never equal to the boiling points of any of the components of the azeotrope
The azeotropic mixture of water and HCI boils at 
. This solution is:
The solutions which boil at constant temperature like a pure liquid and possess same composition in liquid as well as vapour state are called azeotropes. The components of azeotropes cannot be separated by fractional distillation. Only non-ideal solutions form azeotropes. Solutions with negative deviation form maximum boiling azeotrope and the solutions with positive deviation form minimum boiling azeotrope. Boiling poin't of an azeotrope is never equal to the boiling points of any of the components of the azeotrope
The azeotropic mixture of water and HCI boils at . This solution is:
Chemistry-General
