Class 8 Direct And Inverse Proportions CBSE Questions & Answers

Class 8 · Direct And Inverse Proportions

This is Mathematics Class 8 Direct and Inverse Proportions CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
If the weight of 12 sheets of thick paper is 40 grams, how many sheets of the same paper would weigh 2.5 kilograms?
  • A
    700
  • B
    550
  • C
    600
  • D
    750
    Correct
2
A photograph of a bacteria enlarged 50,000 times attains a length of 5 cm as shown in the diagram. What is the actual length of the bacteria?
  • A
    \({\text{1}}{0^{\text{4}}}\)cm
  • B
    \({\text{1}}{0^{ - {\text{3}}}}\)cm
  • C
    \({\text{1}}{0^{ - {\text{4}}}}\)cm
    Correct
  • D
    None of these
3
Rashmi has a road map with a scale of 1 cm representing 18 km. She drives on a road for 72 km. What would be her distance covered in the map?
  • A
    4 cm
    Correct
  • B
    None of these
  • C
    6 cm
  • D
    2 cm
4
A contractor estimates that 3 persons could rewire Jasminder’s house in 4 days. If, he uses 4 persons instead of three, how long should they take to complete the job?
  • A
    4 days
  • B
    3 days
    Correct
  • C
    5 days
  • D
    6 days
5
Two persons could fit new windows in a house in 3 days. How many persons would be needed to fit the windows in one day?
  • A
    4 persons
  • B
    8 persons
  • C
    2 persons
  • D
    6 persons
    Correct
6
The cost of 5 metres of a particular quality of cloth is Rs 210. Find the cost of 10 metres of cloth of the same type.
  • A
    Rs 420
    Correct
  • B
    Rs 470
  • C
    Rs 450
  • D
    Rs 400
7
A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. How many parts of base will be used in mixture by mixing 12 part of red pigment?
  • A
    84
  • B
    None of these
  • C
    96
    Correct
  • D
    108
8
If 15 workers can build a wall in 48 hours, how many workers will be required to do the same work in 30 hours?
  • A
    24
    Correct
  • B
    22
  • C
    20
  • D
    26
9
A train is moving at a uniform speed of 75 km/hour. How far will it travel in 20 minutes?
  • A
    30 km
  • B
    25 km
    Correct
  • C
    18 km
  • D
    20 km
10
A photograph of a bacteria enlarged 50,000 times attains a length of 5 cm as shown in the diagram. If the photograph is enlarged 20,000 times only, what would be its enlarged length?
  • A
    6 cm
  • B
    4 cm
  • C
    8 cm
  • D
    2 cm
    Correct
11
A 5 m 60 cm high vertical pole casts a shadow 3 m 20 cm long. Find at the same time the length of the shadow cast by another pole 10 m 50 cm high.
  • A
    10 m
  • B
    8 m
  • C
    4 m
  • D
    6 m
    Correct
12
A batch of bottles were packed in 25 boxes with 12 bottles in each box. If the same batch is packed using 20 bottles in each box, how many boxes would be filled?
  • A
    15 boxes
    Correct
  • B
    20 boxes
  • C
    25 boxes
  • D
    10 boxes
13
A school has 8 periods a day each of 45 minutes duration. How long would each period be, if the school has 9 periods a day, assuming the number of school hours to be the same?
  • A
    44 minutes
  • B
    48 minutes
  • C
    40 minutes
    Correct
  • D
    36 minutes
14
The cost of 5 metres of a particular quality of cloth is Rs 210. Find the cost of 13 metres of cloth of the same type.
  • A
    Rs 500
  • B
    Rs 700
  • C
    Rs 546
    Correct
  • D
    Rs 600
15
A mixture of paint is prepared by mixing 1 part of red pigments with 8 parts of base. How many parts of base will be used in mixture by mixing 20 part of red pigment?
  • A
    None of these
  • B
    180
  • C
    140
  • D
    160
    Correct