An alloy is an example of_____.

Consider the given question and decide which of the following statement is sufficient to answer the question.

Does the children's ability to grasp ideas in school depend on their intelligence?

Statements:

1. Intelligence is unaffected by bad teaching.

2. Poor children do not perform well in school.

A $5 \mathrm{kg}$ object is raised through a height of $4 \mathrm{m}$. The work done by the force of gravity acting on the object is (take $g= 10 \mathrm{m}/{\mathrm{s}}^2$)

In the following series, one letter is missing as shown by the question mark (?). Select the missing letter from the given options.

$I, L, O, R,$ ? 

The bar graph represents the favourite fruits of Grade $4$ students. What is the total number of students in the class?