Explanation

John B. Watson is known as the founder of Behaviorism, a theory focusing on observable behaviors.

He emphasized that behavior can be measured, trained, and changed without considering internal mental states.

Explanation

A chemical property describes a substance’s ability to undergo a change that alters its chemical identity.

Examples include flammability, reactivity with acids, or ability to rust.

Explanation

To factorize 4x² + 7x + 3:

Let's find two numbers that multiply to 4*3 = 12 and add to 7:

The numbers are 4 and 3 (since 4 + 3 = 7 and 4 * 3 = 12).

Now, rewrite the middle term:

4x² + 4x + 3x + 3

Factor by grouping:

4x(x + 1) + 3(x + 1)

(4x + 3)(x + 1)

The correct answer is (x + 1)(4x + 3).

Explanation

The total surface area (TSA) of a cylinder is given by:

TSA = 2πr(h + r)

Given:

h = 12.4 cm

r = 2.1 cm

TSA = 2 * π * 2.1 * (12.4 + 2.1)

= 2 * 3.14159 * 2.1 * 14.5

≈ 2 * 3.14159 * 30.45

≈ 191.226

Explanation

It is estimated that around 14 muscles are involved when a person smiles.

Major muscles include the zygomaticus major and minor, which lift the corners of the mouth.

Explanation

An electrical impulse causes the cardiac cell's resting potential to convert into an action potential.

This action potential leads to contraction of heart muscle cells, enabling the heart to beat.

Explanation

In Pakistan, federal and provincial governments are formed after general elections, held every 5 years.

These elections determine the members of the National Assembly and Provincial Assemblies, who then elect the Prime Minister and Chief Ministers.

Explanation

Carbon has a valency of 4, and Oxygen has a valency of 2.

By crossing the valencies, we get CO₂ (i.e., one carbon and two oxygen atoms), and the ratio simplifies to the empirical and molecular formula: CO₂.

Explanation

Given cos θ = 4/5 and θ lies in the 4th quadrant.

In the 4th quadrant, cosine is positive, and sine is negative.

We know that sin² θ + cos² θ = 1

sin² θ = 1 - cos² θ

= 1 - (4/5)²

= 1 - 16/25

= 9/25

sin θ = ±√(9/25)

= ±3/5

Since θ lies in the 4th quadrant, sin θ is negative:

sin θ = -3/5

Explanation

Given:

a² + b² + c² = 12

a + b + c = 5

We know that:

(a + b + c)² = a² + b² + c² + 2(ab + bc + ca)

Expanding the equation:

5² = 12 + 2(ab + bc + ca)

25 = 12 + 2(ab + bc + ca)

Subtract 12 from both sides:

13 = 2(ab + bc + ca)

Divide by 2:

ab + bc + ca = 13/2