Mathematics Paper 1 Questions and Answers - Kapsabet Pre Mock 2021/2022

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MATHEMATICS
PAPER 1

INSTRUCTIONS TO CANDIDATES.

  • Write your name and index number in the spaces provided above.
  • Sign and write the date of examination in the spaces provided above.
  • This paper consists of section A and B.
  • Answer ALL questions in section A and B.
  • All your workings must be clearly shown as must be awarded for correct working even if the answer is wrong.
  • Non programmable silent scientific calculators and KNEC mathematical tables may be used.

SECTION A ( 50 MARKS)

  1. Evaluate (3mks)
       
    ³/₄  + 1⁵/₇ ÷ /₇ of  2¹/₃        
            (1
    ³/₇ - ⁵/₈) x ²/₃
  2. A fruit juice dealer sell the juice in packet of 300ml, 500ml and 750ml. find the size of the smallest container that can fill each of the packets and leave a remainder of 200ml. ( 3mks)
  3. Without using table or calculators, evaluate (3mks)
    0.0032 + 0.0608
          1.44 x 0.4
  4. Simplify the following quadratic expression. (3mks)
      8b² - 50a²  
       (2b+5a)²
  5. In a fundraising committee of 45 people, the ratio of men to women is 7:2. Find the number of women required to join the existing committee so that the ratio of men to women is changed to 5: 4. (3mks)
  6. A student expanded ( x + y)2 incorrectly as x2+ y2 calculate the percentage error in the answer if x = 4 and y = 6 (3mks)
  7. The figure below shows a trough which is 40 cm wide at the top and 25 cm wide at the bottom. The trough is 20cm deep and 4.5 m long. Calculate the capacity of the trough in litres. (3mks)
    KapPreM Mathp1q7
  8. Jemima’s team entered a contest where teams of students compete by answering questions that earn either 3 points of 5 points. Jemima’s team scored 44 points after answering 12 questions correctly. How many five-points questions did the team answer correctly. (3mks)
  9. Using compass and ruler only construct a triangle ABC such that AB= 6cm ,BC = 5cm and angle ABC = 67.5o measure the length of AC. (3mks)
  10. Use table of reciprocals only to work out : ( 3mks)
       13      -     3       
    0.156       0.6735 
  11. In the figure below, angle ABE is equal to angle ADC AE = 6cm, ED = 9cm and AB = 8cm, calculate the length of BC. ( 3mks)
    KapPreM Mathp1q11
  12. Simplify the expression below leaving your answer in rationalized surd form of a + bc (4mks)
     1+tan 120º   
    1+Cos 330
    o
  13. The two sides of a triangle are given 6 cm and 5 cm. the angle between them is 130o. calculate the area of the triangle ( giving your answer to 2 decimal places) (3mks)
  14. Given that Km + hn = r and that m = (-32) n = (0 4 ) and r = (-6 0) . Find the scalars k and h ( 3mks)
  15. A Kenyan bank buys and sells foreign currencies as shown.
                                 Buying (Kshs.)      Selling (Kshs.)
       1 Euro                      84.15                    84.26
     100 Japanese  Yen     65.37                   65.45
    A Japanese travelling from France to Kenya had 5000 Euros. He converted all the 5000 Euros to Kenya shillings at the bank. While in Kenya, he spent a total of Kshs. 289,850 and then converted the remaining Kenya shilling to Japanese Yen. Calculate the amount in Japanese Yen that he received. (3mks)
  16. The length of a rectangular mat is 1.5 m longer that its width, Find the length of the mat if its area is 6.5 m2( give your answer to 4 significant figures) ( 3mks)

SECTION B

Answer only five questions from this section

  1. Five towns V,W,X,Y and Z are situated such that W is 200km east of V. X is 300km from W on a bearing of 150o. Y is 350km on a bearing of 240o from X. Z is 150o from V but 200o from X.
    1. Draw the diagram representing the position of the towns. (use a scale of 1cm to represent 50km) . (5mks)
    2.  From the diagram determine
      1. the distance in km of V from Z (1mk)
      2. The bearing of Y from W ( 1mk)
    3. A plane heading to town X takes off from town Y and flies upwards at a constant angle which is less than 90o. After flying a distance of 350km in the air it sees town X at an angle of depression of 50o. Calculate the distance of the plane from X at this point to the nearest km. (3mks)
  2. Two circles of radii 3.5 and 4.2 cm with centres O1 and O2 respectively intersect at points A and B as shown in the figure below. The distance between the two centres is 6 cm.
    KapPreM Mathp1q18
    Calculate
    1. The size of AO1B ( to the nearest degree) ( 3mks)
    2. The size < of A O2B ( to the nearest degree) ( 3mks)
    3. The area of quadrilateral O1AO2B, correct to 2 decimal places. (2mks)
    4. The shaded area correct to 2 significant figures. ( take 22/7) ( 2mks)
  3.              
    1. Complete the table below for the function y = 2x2 + 4 X - 3
      x -4 -3 -2 -1 0 1 2
      2x2 32   8  2  0  2  
      4x-3     -11    -3    
       y      -3     3 13
    2. Draw the graph of the function y = 2x2 + 4x – 3 on the grid provided. (3mks)
    3. Use your graph to estimate the roots of the equation 2x2 + 4x – 3 = 0 ( 1mk)
    4. Use your graph to obtain the roots of the equation 2x2 + x – 5 = 0 to 1 decimal place. (3mks)
    5. Draw the line of symmetry to pass through the turning point of this curve. (1mk)
  4. The table below shows patients who attend a clinic in one week and were grouped by age as shown in the table below.
    Age x years 0≤ x < 5 5≤ x < 15 15≤ x < 25 25≤ x < 45 45≤ x < 75
    Number of patients  14  41  59  70  15

    1. Estimate the mean age (4mks)
    2. On the grid provided draw a histogram to represent the distribution. (3mks)
      Use the scales: 1cm to represent 5 units on the horizontal axis 2 cm to represent 5 units on the vertical axis.
      1. State the group in which the median mark lies ( 1mk)
      2. A vertical line drawn through the median mark divides the total area of the histogram into two equal. Using this information estimate the median mark. (2mks)
  5.         
    1. Show by shading the unwanted region, the region which satisfies the following inequalities (8mks)
      y> -3
      4y ≤5x + 20
      2y < - 5 x + 10
      4y≤ - 3x – 12
    2. Calculate the area of this region in a square units ( 2mks)
  6. The figure below (not drawn to scale) shows a quadrilateral ABCD inscribed in a circle. AB = 5cm, BC = 8cm,CD = 7cm and AD = 8cm. AC is one of the diagonals of length 10cm.
    KapPreM Mathp1q22
    1. Find the size of angle ABC. (3mks)
    2. Find the radius of the circle. (2mks)
    3. Hence, calculate the area of the shaded region. (5mks)
  7.        
    KapPreM Mathp1q23       
    The diagram shows a frustum ABCDEF GH formed from a smaller pyramid ABCDO. The base the top of the frustums are squares of sides 12cm and 5 cm respectively. If Ob = 6cm and each of the slant edges of the frustum is 15 cm long. Calculate to 1 decimal place:
    1. the height OY of the small pyramid (3mks)
    2. the vertical height X Y of the frustum ( 4mks)
    3. the volume of the frustum (3mks)
  8. The table below shows the income tax rates
    Total income per month
    In Kenya Pounds 
     Rate in shillings per pound
     1 - 325  2
     326 - 650  3
     651 - 975  4
     976 - 1300  5
     1301 and above  7
    Mr. Musango earned a basic salary of shs. x and a house allowance of shs. 3000 per month. He claimed a tax relief for a married person of shs. 455 month. He paid shs. 1794 income tax per month.
    1. Calculate Mr. Musango’s basic salary in shs. per month (6mks)
    2. Apart from the income tax, the following monthly deductions are made. Service charge – shs. 100, health insurance fund – shs 280 and 2% of his basic salary as widow and children pension scheme.
      Calculate:
      1. The total monthly deductions (2mks)
      2. Mr. Musango’s net income p.m (2mks)

MARKING SCHEME

  1. ³/₄ + ¹²/₇ ÷ ⁴/₃   =  ³/₄ + ⁹/₇  = 3⁴/₅
        ⁴⁵/₅₆  x ²/₃           ¹⁵/₂₈     
                

  2. 50 300 500 750
     5 6 10 15
     2 6 2 3
     3 3 1 3
      1 1 1
    LCM = 1500 
    Smallest container = 11500 + 200
    = 1700ml.
  3.    ³√0.0032 + 0.0608
             1.44 x 0.4
     √0.064
     √0.576
    =√64  
       √576
    =  √8 x 8   
       √24 x 24
    = 8/24
    =1/3

  4. 2 ( 2b – 5a ) ( 2b + 5a)
    (2b + 5a) (2b + 5a)

    2 ( 2b – 5a) 
      (2b + 5a)

  5. Women originally are 2/9 x 45 = 10
    New no. of women : 4/9 ( 45 + w) = 10+ w
    W = 18 women.

  6. ( x+y)2 = ( 4 +6) 2 = 100
    x2 + y2 = 42 + 62 = 52
    error = 100 – 52
    = 48
    perentage error = 48/100 x 100 %
    = 48%

  7. Vol. = ½ ( 40 + 25) 20 x 450
    = 292500 cm3
    = 292.5 liters M1

  8. Let c rep 3. Pt questions & y rep 5-pt questions
    x + y = 12
    3x + 5y = 44
    x = 8
    y = 4
    Five – points questiosn were 4 M1
  9.     
    KapPreM Mathp1qa9
  10. 13( 0.6 410 x 101 ) – 3(0.1485 x 1010
    83.330 – 4.455
    = 78.875
  11.  
    KapPreM Mathp1qa11
    8/15 = 6/= x = 11.25cm
    BC = 11.25 – 8 = 3.25 cm

  12. 1 + tan 120º = 1 - √3
    1 + cos 330º    1 +√³/₂
    = ( 1 - √3 ) ( 1 - √³/₂)
        ( 1 - √3 ) ( 1 +√³/₂)
    ( 1 - √3 ) (√3  +³/₂)
            1 -  ¾
    = 5/2 - √³/₂
             ¼
    = 10 – 6√³/₂

  13. ½ absin C = Area
    A = ½ X 6 x 5 sin ( 180 – 139)
    = 15 sin 50
    = 11. 49066
    = 11. 49 cm2

  14. km + hn = v
    KapPreM Mathp1qa14
    3k + oh = -6 = k = - 2
    -2k + 4h = 0 = 4h = - 4
    h = -1

  15. 1 Euro - 84.15
    5000 = ?
    5000 x 84.15 = shs. 420750
    420750 – 389850 = shs. 130900
    100 J.Y = 65.45
              ? = 120900
    100 x 13900 = 200 000 J.Y

  16. Let w = x
    L = ( x + 1.5)
    Area = x ( x + 3/2 ) = 6. ½
    X2 + 3/2x – 13/2 = 0
    2x2 + 3x – 13 = 0
    X = - 3 ± √9+(8 x 13) = - 3 ± 10.63
                          4                     4
    X = = 1.9075
    ∴ = 1.9075 + 1.5
    = 3.4075 cm = 3.408
  17.           
    KapPreM Mathp1qa17
  18.          
    1. 4.2 2 = 62 + 3.52 – 2 x 3.5 x 6 Cos x
      17.64 = 36 + 12.25 – 42 cos x
      - 30.61 = - 42 cos x
      0.7288 = Cos x
      43.2133 = x
      43º = x < AO1B = ( 2 x 43)
      = 86º

    2. 3.5 2 = 62 + 4.22 – 2 x 4.2 x 6 Cos  θ
      12.25 = 36 + 17.64 – 50.4 Cos  θ
      - 41.39 = - 50.4 Cos  θ
      0.8212 = Cos θ
      34.7919 =  θ
      35º≈ θ∴< AO2 = 2 ( 35º)
      = 70º

    3. Area O1AO2B = 2 ( area O1AO2B)
      = 2 ( ½ x 4.2 x 6 sin 35º)
      = 14. 45 4126
      = 14.45cm2

    4. Shaded Area = area O1AO2B – Area of sector
      = 14.45 – ( 86/360 x 22/7 x 3.52)
      = 14.45 – 9.1972
      = 5.2528
      = 5.3 cm2 
  19.          
    1.  
      x -4 -3 -2 -1 0 1 2
      2x2 32 18 8  2  0  2  8
      4x-3  -19  -15 -11  -7  -3  1  
       y  13  3  -3  -5  -3 3 13
    2.    
      KapPreM Mathp1qa23    
    3. x = -2.6 ± 0.1
      Or x = 0.6 ± 0.1

    4. y = 2x2 + 4x – 3
      o = 2x2 + x -5
       y = 3x + 2
      y = 3x + 2 drawn on the graph
      X= 1.9 ± 0.1 or x = 1.4 ±
  20.  
    Age Mid 
    Point
     F  FX W F/W F.dx10 C.F
    0 ≤X< 5  2.5 14  35  5  2.8  28  14
    5≤X<15  10  41  410  10  4.1  41  55
    15≤X<25  20  59  1180  10  5.9  59  114
    25≤X<45  35  70  2450  20  3.5  35  184
    45≤X<75  60  15  90  30  0.5  5  199

    1. Mean = Σfx= 4975
      Σf 199 = 25 years
    2.    
      1. 15≤X<25
      2. 22.5 years
  21.      
    KapPreM Mathp1qa21       
  22.            
    1. 102= 82 + 52 - 2 x 8 x 5Cos B       
      Cos B = 89 - 100  -11  
                         80          80
      B =Cos-1(-11/80)=97.90º
    2. 2R= 10/sin 97.90
      R= 5/sin 97.90 = 5.0479cm
             10      =       7      
       sin 82.1º         sin A
      Sin A= 7/10 sin 82.1= 0.6984
      A=sin-1(0.6934)=43.90º
      <COD = 2 x 43.90º =87.80º
      Area = 87.80º/360 x 22/7 x 5.0479 - 1/2 x 5.04329 sin87.80
      =19.5316- 12.7313
      =6.800 cm2
  23.          

  24.          
    1. Total tax 19=794 + 455 = shs. 2249
      1st 325 x 2 = shs. 650
      2nd 325 x 3 = shs. 975
      Rem x x 4 = shs. 624
      Rem 2249 – 1625 = 624
      x x 4 = shs. 624
      x = £156
      Total 325 + 325 + 156 = £806pm

      Total income 20 x 806 = shs. 16120
      Hse/all 3000
      Basic salary shs. 13,120 p.m

    2.      
      1. Total deductions
        1794 + 100 + 280 + 2624
        13120/100 x R = 2624
        = shs. 4798 p.m

      2. 16120 – 4798 = shs. 11322 p.m

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