Subject

Quantitative Aptitude

Class

SSCCGL Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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71.

From a point on a bridge across the river, the angles of depression of the banks on opposite sides of the river are 30° and 45° respectively. If the bridge is at a height of 2.5 m from the banks, then the width of the river is (take square root of 3 space equals space 1.732):

  • 5.83 m

  • 6.83 m

  • 5.76 m

  • 6.87 m


B.

6.83 m


Let the width of the river be (x + y) m
In ΔABD,
    tan space 45 degree space equals space AD over BD
1 space equals space fraction numerator 2.5 over denominator straight x end fraction
straight x space equals space 2.5 space straight m

In ΔADC,
      tan space 30 degree space equals space AD over CD
fraction numerator 1 over denominator square root of 3 end fraction space equals space fraction numerator 2.5 over denominator straight y end fraction
straight y space equals space 2.5 square root of 3 space straight m

∴  Width of the river 
      = (x + y) m
      equals space 2.5 space plus space 2.5 square root of 3
equals space 2.5 space left parenthesis 1 space plus space square root of 3 right parenthesis
equals space 2.5 space left parenthesis 1 space plus space 1.732 right parenthesis
equals space 2.5 space cross times space 2.732
equals space 6.83 space straight m
                    


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72.

The pie-chart given below shows usage of materials in a construction of house. Study the chart and answer the questions.

The percentage of steel used in the construction of a house is:

  • 10%

  • 12%

  • 20%

  • 36%

33 Views

73.

The pie-chart given below shows usage of materials in a construction of house. Study the chart and answer the questions.

The ratio of cement and bricks used in the construction is:

  • 3 : 4

  • 2 : 3

  • 4 : 3

  • 2 : 5

35 Views

74.

The pie-chart given below shows usage of materials in a construction of house. Study the chart and answer the questions.

If the cost of cement is â‚¹ 5,000/-, then the labour cost is

  • ₹ 5,500

  • ₹ 6,250

  • ₹ 9,000

  • ₹ 4,000

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75.

The pie-chart given below shows usage of materials in a construction of house. Study the chart and answer the questions.

The average of percentages of steel, cement and miscellaneous items used in the construction is

  • 10%

  • 25%

  • 20%

  • 35%

36 Views

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