MCQs and Q&As

I. x2 – x – 42 = 0, II. y2 – 17y + 72 = 0 to solve both the equations to find the values of x and y?

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I. x2 – x – 42 = 0,
II. y2 – 17y + 72 = 0 to solve both the equations to find the values of x and y?

A. If x < y (Correct)
B. If x > y
C. If x ≤ y
D. If x ≥ y
E. If x = y or the relationship between x and y cannot be established.

Explanation:

I. x2 – 7x + 6x – 42 = 0
=> (x – 7)(x + 6) = 0 => x = 7, -6
II. y2 – 8y – 9y + 72 = 0
=> (y – 8)(y – 9) = 0 => y = 8, 9
=> x < y

 

Mostly bank notes in the world are made of what?

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Mostly bank notes in the world are made of what?

A. Cotton  (Correct)
B. Paper
C. Cellulose
D. Wood

Banknotes are generally made of cotton paper. Sometimes cotton is mixed with linen, abaca or other types of fibres to increase its life. The paper used is more durable than everyday paper which makes it resistant to wear and tear.

 

Raoult’s law states that ‘the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component’. This generalisation is based on the assumption that the________________?

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Raoult’s law states that ‘the equilibrium vapor pressure that is exerted by a component in a solution is proportional to the mole fraction of that component’. This generalisation is based on the assumption that the________________?

A. Sizes of the component molecules are approximately equal
B. Attractive forces between like and unlike molecules are approximately equal
C. Component molecules are non-polar and no chemical combination or molecular association
between unlike molecules takes place in the formation of the solution
D. All A., B. & C. (Correct)