Secondary School (English Medium) (5 to 8) Class 8 - CBSE Question Bank Solutions

A sum is taken for two years at 16% p.a. If interest is compounded after every three months, the number of times for which interest is charged in 2 years is ______.

To calculate the growth of a bacteria if the rate of growth is known, the formula for calculation of amount in compound interest can be used.

Compound interest is the interest calculated on the previous year’s amount.

Find the difference between Compound Interest and Simple Interest on Rs 45,000 at 12% per annum for 5 years.

A graph that displays data that changes continuously over periods of time is ______.

Which graphs of the following represent the table below?

A line graph can also be a whole unbroken line.

Study the given graph and complete the corresponding table below.

Study the given graph and complete the corresponding table below.

Plot a line graph for the variables p and q where p is two times q i.e, the equation is p = 2q. Then find.

1. the value of p when q = 3
2. the value of q when p = 8

Plot a line graph for the variables p and q where p is two times q i.e, the equation is p = 2q. Then find the value of q when p = 8

Study the graph and answer the questions that follow.

1. What information does the graph give?
2. On which day was the temperature the least?
3. On which day was the temperature 31°C?
4. Which was the hottest day?

The following graph shows the change in temperature of a block of ice when heated. Use the graph to answer the following questions:

1. For how many seconds did the ice block have no change in temperature?
2. For how long was there a change in temperature?
3. After how many seconds of heating did the temperature become constant at 0°C?
4. What was the temperature after 25 seconds?
5. What will be the temperature after 1.5 minutes? Justify your answer.

The following graph shows the number of people present at a certain shop at different times. Observe the graph and answer the following questions.

1. What type of a graph is this?
2. What information does the graph give?
3. What is the busiest time of day at the shop?
4. How many people enter the shop when it opens?
5. About how many people are there in the shop at 1:30 pm?

As part of his science project, Prithvi was supposed to record the temperature every hour one Saturday from 6 am to midnight. At noon, he was taking lunch and forgot to record the temperature. At 8:00 pm, his favourite show came on and so forgot again. He recorded the data so collected on a graph sheet as shown below.

1. Why does it make sense to connect the points in this situation?
2. Describe the overall trend, or pattern, in the way the temperature changes over the time period shown on the graph.
3. Estimate the temperature at noon and 8 pm.

Simplify 3x (4x −5) + 3 and find its values for x = `1/2.` 

The product of two rational numbers is always a ________.

Find ten rational numbers between `(-2)/5` and `1/2`

Find five rational numbers between `2/3 " and " 4/5`

Find five rational numbers between `(-3)/2 " and " 5/3`