Cbse Open Text Based Assessment Worksheet - Class Ix - Board Of High School And Intermediate Education - 2015-2016 Page 26

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8. For the consumption of x units, lies between 200 units and 400 units for a month as per
Delhi Tariff slabs shown in actual bill, form a linear equation in the total cost Rs. y and
total consumption x units. Find the total consumption, if total electric bill for the month
is Rs. 1752.
(4 marks)
9. For the consumption of x units, lies between 200 units and 400 units for a month as per
Delhi Tariff slabs shown in actual bill, form a linear equation in the total cost Rs. y and
total consumption x units. Find the total bill, if total consumption for the month is 380
units.
(4 marks)
10. The following table shows the types of electrical appliances and their average usage per
day in a particular home in Delhi.
Appliances
Approximate Load(Watts)
Average hours/day
Tube lights (3)
40
7
Electric Bulbs (2)
100
x
Electric Iron
800
0.5
Refrigerator
180
24
Computer
200
y
The total electrical charges of the home in a particular month are Rs 423.12. Form a
linear relationship between x and y. If x = 3, then find the number of hours for which
computer was used in the month.
(3 marks)
11. Rohan has a house and a factory in Delhi. In a particular month, 1200 units were
consumed in the factory and x number of units between 200 and 400 were consumed in
the house. Form a linear equation to calculate the total amount of electrical charges
incurred.
(3 marks)
12. The electricity tariff plan of a particular state is as follows:
First 100 units
Rs 2.50/unit
Next 150 units
Rs 3.00/unit
Next 150 units
Rs 4.50/unit
Any units above 400 Rs 7.50/unit
The fixed charge is Rs 250. Form a linear equation if the total bill of a particular house
(excluding surcharge and electricity tax) in the state is above Rs 2,000 for a month
assuming that x units are consumed in the actual bill.
(3 marks)
13. For the consumption of x units for a month as per Mumbai Tariff slabs shown in actual
bill, form a linear equation in the total cost Rs. y and total consumption x units lies
between 400 units and 600 units. Find the total consumption, if total electric bill for a
month is Rs. 2136.
(4 marks)
14. For the consumption of x units, lies between 200 units and 400 units for a month as per
Chennai Tariff slabs shown in actual bill, form a linear equation in the total cost Rs. y
and total consumption x units. Find the total consumption, if total electric bill for the
month is Rs. 1752.
(4 marks)
Prepared by: M. S. KumarSwamy, TGT(Maths)
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