21.

Mr. Nadeem gave the following task to his class, after completing the topic on lines and angles. Speak for 2 min on the following figures using your knowledge about lines and angles

This task is

• reflective in nature can be used to pass time

• exploratory in nature can be used for summative assessments

• reflective as well can be used for formative assessment

• communicating and can encourage Mathematical talk in the classroom during free time

A child of Class VII defined the rectangle as follows
"Rectangle is a quadrilateral whose opposite sides are parallel and equal"
The definition reflects that the child

• cannot recognize the shape

• do not know the correct properties of the shape

• knows the properties of the shape, but repeated some properties in definition

• knows some properties, but missed some important to complete the definition

A very common error observed in addition of linear expression is 5y + 3 = 8y
This type of error is termed as

• clerical error

• conceptual error

• procedural error

• careless error

Read the following question from the Class VI textbook
"Prabal deposited { 5000 in a bank at the rate of 5% interest per annum. After 2 yr, he withdrew the money to purchase the study table for { 3500. He deposited the money left with him again at the rate of 5% interest per annum for another two years. How much amount will he receive after two years?"
What values can be inculcated in students through this question?

• Honesty

• Habit of saving money and spending it wisely

• Sincerity

• Simplicity and helping others

Following is a problem from textbook of Class VI

Express the following statement through linear expression
Neha has 7 more toffees than Megha. If Megha has x toffees, how many toffees does Neha have?

Which competence of Bloom's cognitive domain is referred in the above question?

• Knowledge

• Comprehension

• Analysis

• Synthesis

If p=3²⁰⁰⁰ + 3^-2000 and q = 3²⁰⁰⁰- 3^-2000 , then the value of p²-q² is 

• 1

• 2

• 3

• 4

The square of 9 is divided by the cube root of 125. The remainder is

• 1

• 2

• 3

• 4

The value of $\sqrt{16\sqrt{8\sqrt{4}}}$

• 16

• 8

• $8^3\sqrt{2}$

• $16\sqrt{2}$

One-half of 1.2 x 10^{30 _is} 

• 6.0 x 10³⁰

• 6.0 x 10²⁹

• 0.6 x 5³⁰

• 1.2 x 10¹⁵

If $\frac{2}{3}$,$\frac{23}{30}$,$\frac{9}{10}$,$\frac{11}{15}$ and $\frac{4}{5}$ are written in ascending order, then the fraction in the middlemost will be

• $\frac{23}{30}$

• $\frac{4}{5}$

• $\frac{2}{3}$

• $\frac{11}{15}$