Hint - read all of the five possible answers first. Often, if one answer is correct, another can't be. So removing the necessity of working through all of the remaining three.

70.     If       y = A ,                     which one of the following is FALSE?
                        B + x

1.         y =    1 .
           A   B + x

2.         y = A + A
                  B     x

3.         1 = B + x
            y        A

4.         A = y (B + x)

5.         yB + yx = A
 

71.         If   y = A ,                     which one of the following is FALSE?
                        B + x

1.        1 = B + x
           y   A    A

2.        B + x = A
                        y

3.        x = A - B
                  y

4.        B + x = y
                        A

5.         1 = B + x
            y    A
 

72.     With regard to the equation     y =  A ´ x
                                                                B + x

which one of the following is FALSE?:

1.        When x >> B, y = A
2.        When x = B, y = A/2
3.        When x << B, y = A ´ x/B
4.        When x = 0, y = 0
5.        When x = -B, y = -B´A

73. With regard to the equation         y = P ´ x
                                                              Q + x

which one of the following is FALSE?:

1.        When x << Q, y = P ´ x/Q
2.        When x = Q, y = P/2
3.        When x >> Q, y = P
4.        When x = 0, y = P/Q
5.        When x = -Q, y = minus infinity

74.     If y = m.x + c the plot of y against x is a straight line. Which one of these is false?:

1.        the slope of the plot is m
2.        the intercept on the y-axis is c
3.        the line cuts the x-axis at x = c/m
4.        x = (y - c)/m
5.        when x = 0, y = c

75.     If y = 2x + 4 ,which one of the following is FALSE?

1.        The plot of y against x gives a straight line of slope 2
2.        The intercept on the y-axis is 4
3.        The intercept on the x-axis is –2
4.        The point x = 3, y = 10 lies on the line
5.        y is inversely proportional to x

76.     If y = 6 - 3x , which one of the following is FALSE?

1.        The plot of y against x gives a straight line of slope 3
2.        The intercept on the y-axis is 6
3.        The intercept on the x-axis is 2
4.        The point x = 1, y = 3 lies on the line
5.        y is linearly related to x

77.     If the equation for the line in the above graph is y = m.x +c, which statement is false?

1.        The numerical value of the gradient is 2
2.        The value of c is 1 cm
3.        When y = 0, x = - 1 min
4.        The units of the gradient of the line are cm.min-¹
5.        If y = 4, x = 1.5

78.        With regard to the graph:

 
 

Which one of the following is FALSE?:

1.        The equation of the line is y = 1 - 0.2 ´x
2.        When y = 0.4, x = 3
3.        The point (-5,2) lies on the line
4.        The slope of the line is -5
5.        The units of the slope are l.mg^-1.cm^-1
 

79. With regard to the graph:

Which one of the following is FALSE?:

1.        The equation of the line is y = 0.2 ´ x+ 1
2.        The units of the slope are l.mg^-1.cm^-1
3.        The point (-5,2) lies on the line
4.        The intercept on the y-axis is 1.0
5.        When y = 0.2, x = 4

80.     The relationship between absorbance (y cm^-1) and concentration (x mmol.l^-1) is:
                    y = 0.5 ´ x - 0.01

Which one of the following is FALSE?:

1.        The graph of y against x is a straight line
2.        It cuts the x-axis to the right of the origin
3.        Its slope is positive
4.        When x = 3, y = 1.4
5.        The units of the slope are l.mmol^-1.cm^-1

81.     A graph shows that the rate of an enzymic reaction, measured in mmol.ml^-1.min^-1, is proportional to the concentration of enzyme, measured in mg.ml^-1. The units of the slope of the straight line are:

1.        mg.min^-1
2.        mmol.ml^-1
3.        mmol.min^-1
4.        mmol.mg^-1.min^-1
5.        mmol.ml^-1.mg^-1.min^-1

82.     A graph shows that the rate of an enzymic reaction, measured in mmol.l^-1.min^-1, is proportional to the concentration of the enzyme, measured in mmol.l^-1. The units of the slope of the straight line are:

1.        mmol.l^-1
2.        mmol.l^-1.min^-1
3.        mmol
4.        min^-1
5.        mmol^-1.min^-1

83.     Which one of the following statements is FALSE?:

1.        If y = 10^x, log₁₀y = x
2.        10^x× 10^y = 10^x+y
3.        If log_ex = y, x = e^y
4.        Log₁₀(a + b) = log₁₀a + log₁₀b
5.        Log₁₀(a/b) = log₁₀a - log₁₀b
 
 

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