Explanation

Jean Piaget was a Swiss psychologist who theorized stages of cognitive (intellectual) development in children.

His stages include:

1. Sensorimotor
2. Preoperational
3. Concrete Operational
4. Formal Operational

Explanation

a:b = 8:9, b:c = 6:5

Make b same:

a:b = 16:18, b:c = 18:15

So, a:b:c = 16:18:15

Explanation

Each die has 6 faces, so the total outcomes when rolling two dice = 6 × 6 = 36.

Only 1 outcome gives 5 on both dice: (5,5). So, probability = 1/36.

Explanation

An achievement test measures a student’s knowledge in specific academic subjects like reading, math, science, etc.

It evaluates how much a learner has already learned from instruction.

Explanation

"Memorizing" belongs to the cognitive domain, not the affective domain.

The five affective levels are:

1. Receiving
2. Responding
3. Valuing
4. Organizing
5. Characterizing

Explanation

"The" is used before superlative adjectives like "highest".

It refers to something specific and unique, such as the highest building.

Explanation

Since ∠A = ∠B, sides AC = BC, and ∠C is the unequal angle.

The angle bisector of ∠C splits the triangle into two congruent triangles by SAS (Side-Angle-Side) rule.

Explanation

Circumference is the total length around a circle.

It is calculated as 𝐶 = 2𝜋𝑟, where 𝑟 is the radius.

Explanation

8 men make 18 chairs in 9 days.

First, find out how much work 1 man does in 1 day:

8 men × 9 days = 72 man-days for 18 chairs.

Now, for 27 chairs in 6 days:

Let the number of men be x.

x men × 6 days = 6x man-days.

Compare the two situations:

18 chairs / 72 man-days = 27 chairs / 6x man-days

18 × 6x = 27 × 72

108x = 1944

x = 18

Explanation

Casein plastic is made by adding an acid (like vinegar) to milk, which causes the casein protein to form a solid.

This solid can be molded and dried to create a type of early plastic, known as casein plastic.