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All questions of Direct and Inverse Proportions for Class 8 Exam
Manish can pack 260 bundles in 5 days. How many bundles can be pack in 7 days?- a)264
- b)364
- c)384
- d)324
Correct answer is option 'B'. Can you explain this answer?
Manish can pack 260 bundles in 5 days. How many bundles can be pack in 7 days?
a)
264
b)
364
c)
384
d)
324
 | Ananya Das answered |
If x is bundles can be pack in 7 days then
A photograph of a bacteria enlarged 70000 times attains a length of 7 cm. What is the actual length of the bacteria?- a)103cm
- b)10 -3cm
- c)10-2cm
- d)10-4cm
Correct answer is option 'D'. Can you explain this answer?
A photograph of a bacteria enlarged 70000 times attains a length of 7 cm. What is the actual length of the bacteria?
a)
103cm
b)
10 -3cm
c)
10-2cm
d)
10-4cm
 | Anushka Shah answered |
To find the actual length of the bacteria, we can use the concept of magnification. Magnification is the ratio of the size of an object under a microscope to its actual size.
Given:
Enlargement: 70000 times
Length of the photograph: 7 cm
We need to find the actual length of the bacteria.
Let's solve this step by step:
Step 1: Calculate the magnification factor
Magnification = Enlarged size / Actual size
In this case,
Enlarged size = Length of the photograph = 7 cm
Actual size = ?
Magnification = 70000
So, 70000 = 7 / Actual size
Step 2: Cross-multiply and solve for Actual size
70000 * Actual size = 7
Actual size = 7 / 70000
Step 3: Simplify the fraction
Actual size = 1 / 10000
Therefore, the actual length of the bacteria is 10^-4 cm.
Hence, the correct answer is option D) 10^-4 cm.
Given:
Enlargement: 70000 times
Length of the photograph: 7 cm
We need to find the actual length of the bacteria.
Let's solve this step by step:
Step 1: Calculate the magnification factor
Magnification = Enlarged size / Actual size
In this case,
Enlarged size = Length of the photograph = 7 cm
Actual size = ?
Magnification = 70000
So, 70000 = 7 / Actual size
Step 2: Cross-multiply and solve for Actual size
70000 * Actual size = 7
Actual size = 7 / 70000
Step 3: Simplify the fraction
Actual size = 1 / 10000
Therefore, the actual length of the bacteria is 10^-4 cm.
Hence, the correct answer is option D) 10^-4 cm.
By working 8 hours a day Ankur can copy a book in 18 days. How many hours a day should he work so as to finish the work in 12 days?- a)10 hours
- b)12 hours
- c)14 hours
- d)16 hours
Correct answer is option 'B'. Can you explain this answer?
By working 8 hours a day Ankur can copy a book in 18 days. How many hours a day should he work so as to finish the work in 12 days?
a)
10 hours
b)
12 hours
c)
14 hours
d)
16 hours
 | Baishali Menon answered |
No of working hrs per day = 8
No of days = 18
total working hrs = 8 x 18 = 144hrs
given time = 12hrs
so no of working hrs per day is = 144�12 = 12hrs
Therefore anu should work for 12 hrs a day in order to complete the work in 12 days
long trench in one day. How many men should be employed for digging 27 m trench of the same type in one day?
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