About this quiz
Household Arithmetic: Electricity, Water and Telephone Bills and Money Exchange
This Lok Sewa practice set has 56 multiple-choice questions (Subject: Maths and IQ · For: Kharidar · Level: Medium). Take the quiz above first; after that, use the study list below to revise every question with its correct answer and a short explanation.
Study list: all 56 questions with answers and explanations
Previous reading 4,325; current 4,400. Units used?
- A) 65
- B) 75 ✔
- C) 85
- D) 725
Why: Units used = current − previous = 4,400 − 4,325 = 75.
Using the example tariff, the bill for 75 units is:
- A) Rs 515
- B) Rs 565 ✔
- C) Rs 600
- D) Rs 625
Why: Applying each slab rate of the example tariff to 75 units and adding the charges gives Rs 565.
Using the example tariff, the bill for 40 units is:
- A) Rs 220
- B) Rs 270 ✔
- C) Rs 330
- D) Rs 280
Why: 20 × 4 + 20 × 7 = 220; + 50 = 270.
Using the example tariff, the bill for 120 units is:
- A) Rs 920
- B) Rs 970 ✔
- C) Rs 1,080
- D) Rs 1,030
Why: 80 + 210 + 70 × 9 = 920; + 50 = 970.
Water: minimum Rs 100 up to 10,000 L, Rs 32 per extra 1,000 L. Bill for 16,000 L?
- A) Rs 192
- B) Rs 292 ✔
- C) Rs 312
- D) Rs 512
Why: Extra water = 16,000 − 10,000 = 6,000 L = 6 × Rs 32 = Rs 192. Bill = 100 + 192 = Rs 292.
With the same water tariff, the bill for 10,000 L is:
- A) Rs 100 ✔
- B) Rs 132
- C) Rs 320
- D) Rs 0
Why: 10,000 L is within the minimum limit, so only the minimum charge of Rs 100 applies.
Rental Rs 200 + calls Rs 150, plus 13% VAT. Total:
- A) Rs 350
- B) Rs 395.50 ✔
- C) Rs 400
- D) Rs 380
Why: Subtotal = 200 + 150 = Rs 350. With 13% VAT: 350 × 1.13 = Rs 395.50.
If 1 USD = Rs 135, what do 200 USD cost?
- A) Rs 2,700
- B) Rs 27,000 ✔
- C) Rs 13,500
- D) Rs 270
Why: 200 × Rs 135 = Rs 27,000.
How many USD for Rs 40,500 at Rs 135 per USD?
- A) 250
- B) 300 ✔
- C) 350
- D) 400
Why: Rs 40,500 ÷ 135 = 300 USD.
5,000 INR in NPR (1 INR = 1.6 NPR):
- A) Rs 3,125
- B) Rs 8,000 ✔
- C) Rs 6,600
- D) Rs 5,160
Why: 5,000 × 1.6 = Rs 8,000.
16,000 NPR in INR:
- A) 10,000 ✔
- B) 25,600
- C) 9,000
- D) 12,000
Why: 16,000 ÷ 1.6 = 10,000 INR.
When you buy dollars from a bank, you pay the bank's:
- A) Buying rate
- B) Selling rate ✔
- C) Middle rate
- D) Any rate
Why: When you buy dollars, the bank is selling, so you pay the bank's selling rate.
If 1 GBP = Rs 170, then 50 GBP = ?
- A) Rs 8,500 ✔
- B) Rs 3,400
- C) Rs 850
- D) Rs 17,000
Why: 50 × Rs 170 = Rs 8,500.
1 USD = Rs 135, 1 EUR = Rs 150. 90 EUR equals how many USD?
- A) 90
- B) 100 ✔
- C) 110
- D) 81
Why: 90 EUR = 90 × 150 = Rs 13,500. Rs 13,500 ÷ 135 = 100 USD.
Who publishes daily foreign exchange rates in Nepal?
- A) Nepal Rastra Bank ✔
- B) Ministry of Finance
- C) Nepal Telecom
- D) NEA
Why: Nepal Rastra Bank publishes the daily foreign exchange rates.
An electricity meter read 4520 last month and 4610 this month. How many units were used?
- A) 90 ✔
- B) 100
- C) 85
- D) 9130
Why: 4,610 − 4,520 = 90 units.
An electricity meter read 1285 last month and 1400 this month. How many units were used?
- A) 125
- B) 115 ✔
- C) 110
- D) 2685
Why: 1,400 − 1,285 = 115 units.
An electricity meter read 9870 last month and 10035 this month. How many units were used?
- A) 175
- B) 160
- C) 165 ✔
- D) 19905
Why: 10,035 − 9,870 = 165 units.
An electricity meter read 3305 last month and 3388 this month. How many units were used?
- A) 93
- B) 78
- C) 6693
- D) 83 ✔
Why: 3,388 − 3,305 = 83 units.
90 units of electricity are used at Rs 9 per unit. What is the energy charge?
- A) Rs 810 ✔
- B) Rs 819
- C) Rs 792
- D) Rs 99
Why: 90 × Rs 9 = Rs 810.
150 units of electricity are used at Rs 10 per unit. What is the energy charge?
- A) Rs 1,510
- B) Rs 1,500 ✔
- C) Rs 1,480
- D) Rs 160
Why: 150 × Rs 10 = Rs 1,500.
75 units of electricity are used at Rs 8 per unit. What is the energy charge?
- A) Rs 608
- B) Rs 584
- C) Rs 600 ✔
- D) Rs 83
Why: 75 × Rs 8 = Rs 600.
120 units of electricity are used at Rs 11 per unit. What is the energy charge?
- A) Rs 1,331
- B) Rs 1,298
- C) Rs 131
- D) Rs 1,320 ✔
Why: 120 × Rs 11 = Rs 1,320.
Electricity tariff: first 20 units at Rs 4/unit, units above 20 at Rs 7/unit, plus service charge Rs 30. Bill for 50 units is:
- A) Rs 320 ✔
- B) Rs 380
- C) Rs 230
- D) Rs 290
Why: 20 × 4 = 80; 30 × 7 = 210; plus 30 service charge = Rs 320.
Electricity tariff: first 20 units at Rs 3/unit, units above 20 at Rs 8/unit, plus service charge Rs 50. Bill for 80 units is:
- A) Rs 690
- B) Rs 590 ✔
- C) Rs 290
- D) Rs 540
Why: 20 × 3 = 60; 60 × 8 = 480; plus 50 service charge = Rs 590.
Electricity tariff: first 20 units at Rs 5/unit, units above 20 at Rs 9/unit, plus service charge Rs 75. Bill for 120 units is:
- A) Rs 1,155
- B) Rs 675
- C) Rs 1,075 ✔
- D) Rs 1,000
Why: 20 × 5 = 100; 100 × 9 = 900; plus 75 service charge = Rs 1,075.
Water used is 25 units at Rs 32 per unit plus a meter rent of Rs 100. What is the bill?
- A) Rs 800
- B) Rs 932
- C) Rs 2,500
- D) Rs 900 ✔
Why: 25 × 32 = Rs 800, plus Rs 100 meter rent = Rs 900.
Water used is 18 units at Rs 40 per unit plus a meter rent of Rs 80. What is the bill?
- A) Rs 800 ✔
- B) Rs 720
- C) Rs 840
- D) Rs 1,440
Why: 18 × 40 = Rs 720, plus Rs 80 meter rent = Rs 800.
A water tariff has a minimum charge of Rs 200 for up to 10 units and Rs 30 per unit above 10. Bill for 6 units is:
- A) Rs 180
- B) Rs 200 ✔
- C) Rs 380
- D) Rs 100
Why: Usage is within 10 units, so the minimum charge of Rs 200 applies.
A phone bill has a monthly rent of Rs 200 and calls of 300 minutes at Rs 1.5 per minute. Total bill?
- A) Rs 450
- B) Rs 850
- C) Rs 650 ✔
- D) Rs 750
Why: 300 × 1.5 = Rs 450, plus Rs 200 rent = Rs 650.
A phone bill has a monthly rent of Rs 250 and calls of 120 minutes at Rs 3 per minute. Total bill?
- A) Rs 360
- B) Rs 860
- C) Rs 1,110
- D) Rs 610 ✔
Why: 120 × 3 = Rs 360, plus Rs 250 rent = Rs 610.
A bill of Rs 1,000 has 13% VAT added. What is the total payable?
- A) Rs 1,130 ✔
- B) Rs 1,100
- C) Rs 1,013
- D) Rs 870
Why: 1,000 + 13% = 1,000 + 130 = Rs 1,130.
A bill of Rs 2,400 has 13% VAT added. What is the total payable?
- A) Rs 2,640
- B) Rs 2,712 ✔
- C) Rs 2,413
- D) Rs 2,088
Why: 2,400 + 13% = 2,400 + 312 = Rs 2,712.
A bill of Rs 700 has 13% VAT added. What is the total payable?
- A) Rs 770
- B) Rs 713
- C) Rs 791 ✔
- D) Rs 609
Why: 700 + 13% = 700 + 91 = Rs 791.
A bill of Rs 1,500 is paid late and a 5% fine is added. Amount to pay?
- A) Rs 75
- B) Rs 1,425
- C) Rs 1,505
- D) Rs 1,575 ✔
Why: 1,500 + 5% = 1,500 + 75 = Rs 1,575.
A bill of Rs 2,000 is paid late and a 10% fine is added. Amount to pay?
- A) Rs 2,200 ✔
- B) Rs 200
- C) Rs 1,800
- D) Rs 2,010
Why: 2,000 + 10% = 2,000 + 200 = Rs 2,200.
A bill of Rs 800 is paid late and a 25% fine is added. Amount to pay?
- A) Rs 200
- B) Rs 1,000 ✔
- C) Rs 600
- D) Rs 825
Why: 800 + 25% = 800 + 200 = Rs 1,000.
A 2% rebate is given for early payment of a Rs 1,200 bill. Amount to pay?
- A) Rs 1,224
- B) Rs 24
- C) Rs 1,176 ✔
- D) Rs 1,198
Why: 1,200 − 2% = 1,200 − 24 = Rs 1,176.
A 3% rebate is given for early payment of a Rs 3,000 bill. Amount to pay?
- A) Rs 3,090
- B) Rs 90
- C) Rs 2,997
- D) Rs 2,910 ✔
Why: 3,000 − 3% = 3,000 − 90 = Rs 2,910.
A 1000 W heater runs 2 hours a day for 30 days. Units used?
- A) 60 ✔
- B) 120
- C) 30
- D) 2000
Why: 1,000 W = 1 kW. 1 kW × 2 h × 30 days = 60 kWh = 60 units.
One "unit" of electricity on a bill means:
- A) 1 watt
- B) 1 kilowatt-hour ✔
- C) 1 volt
- D) 1 ampere-hour
Why: One unit of electricity is 1 kilowatt-hour (kWh).
The difference between two meter readings gives:
- A) Total bill
- B) Service charge
- C) Units consumed ✔
- D) VAT
Why: The difference between two readings gives the units consumed.
Previous reading 2310, present reading 2455, rate Rs 12 per unit. What is the energy charge?
- A) Rs 1,740 ✔
- B) Rs 1,860
- C) Rs 29,460
- D) Rs 1,680
Why: Units = 2,455 − 2,310 = 145. Charge = 145 × 12 = Rs 1,740.
Previous reading 7020, present reading 7180, rate Rs 9 per unit. What is the energy charge?
- A) Rs 1,530
- B) Rs 1,440 ✔
- C) Rs 64,620
- D) Rs 1,395
Why: Units = 7,180 − 7,020 = 160. Charge = 160 × 9 = Rs 1,440.
Previous reading 560, present reading 642, rate Rs 10 per unit. What is the energy charge?
- A) Rs 920
- B) Rs 6,420
- C) Rs 820 ✔
- D) Rs 770
Why: Units = 642 − 560 = 82. Charge = 82 × 10 = Rs 820.
Previous reading 11900, present reading 12075, rate Rs 8 per unit. What is the energy charge?
- A) Rs 1,480
- B) Rs 96,600
- C) Rs 1,360
- D) Rs 1,400 ✔
Why: Units = 12,075 − 11,900 = 175. Charge = 175 × 8 = Rs 1,400.
A family's total bill of Rs 1,840 is shared equally by 4 members. Each pays:
- A) Rs 460 ✔
- B) Rs 510
- C) Rs 7,360
- D) Rs 440
Why: 1,840 ÷ 4 = Rs 460 each.
A family's total bill of Rs 2,760 is shared equally by 6 members. Each pays:
- A) Rs 510
- B) Rs 460 ✔
- C) Rs 16,560
- D) Rs 440
Why: 2,760 ÷ 6 = Rs 460 each.
A family's total bill of Rs 960 is shared equally by 3 members. Each pays:
- A) Rs 370
- B) Rs 2,880
- C) Rs 320 ✔
- D) Rs 300
Why: 960 ÷ 3 = Rs 320 each.
An internet plan costs Rs 500 per month. What is the cost for 12 months?
- A) Rs 6,500
- B) Rs 5,500
- C) Rs 512
- D) Rs 6,000 ✔
Why: 500 × 12 = Rs 6,000.
An internet plan costs Rs 650 per month. What is the cost for 12 months?
- A) Rs 7,800 ✔
- B) Rs 8,450
- C) Rs 7,150
- D) Rs 662
Why: 650 × 12 = Rs 7,800.
An internet plan costs Rs 399 per month. What is the cost for 6 months?
- A) Rs 2,793
- B) Rs 2,394 ✔
- C) Rs 1,995
- D) Rs 405
Why: 399 × 6 = Rs 2,394.
Units used rose from 120 to 150. What is the percentage increase?
- A) 30%
- B) 12.5%
- C) 25% ✔
- D) 35%
Why: Increase = 30 ÷ 120 × 100 = 25%.
Units used rose from 200 to 260. What is the percentage increase?
- A) 60%
- B) 15%
- C) 40%
- D) 30% ✔
Why: Increase = 60 ÷ 200 × 100 = 30%.
Last month's bill was Rs 1,500 and this month's is Rs 1,650. By how much did the bill change?
- A) Rs 150 increase ✔
- B) Rs 150 decrease
- C) Rs 3,150
- D) Rs 300 increase
Why: 1,650 − 1,500 = Rs 150 increase.
Last month's bill was Rs 2,000 and this month's is Rs 1,800. By how much did the bill change?
- A) Rs 200 increase
- B) Rs 200 decrease ✔
- C) Rs 3,800
- D) Rs 400 decrease
Why: 2,000 − 1,800 = Rs 200 decrease.