Explanation

How does the Navstar GPS work for different applications? (5)

The Navstar GPS works by using a constellation of satellites that send signals to GPS receivers on the ground, allowing them to calculate precise location coordinates.

It is used in various applications like navigation, mapping, surveying, military operations, and location tracking for vehicles and personal devices.

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Explanation

Differentiate between network and internet.

Network: A network is a group of interconnected computers or devices that can share resources and information, typically within a local area (LAN) or wide area (WAN).

Internet: The internet is a global network of networks that connects millions of private, public, academic, and governmental systems, enabling worldwide communication and information sharing.

Explanation

What is the difference among application, program and software?

Application: A specific software designed to perform a particular task, like word processing or browsing the internet.

Program: A set of instructions written to execute a particular task or solve a problem, which can be part of an application or software.

Software: A broad term that refers to any collection of programs or applications that perform various tasks on a computer system.

Explanation

(b) How the carbohydrates, proteins, and fats are digested in humans? (5)

Carbohydrates:
Carbohydrates are broken down into glucose by enzymes like amylase in the mouth and small intestine.

Proteins:
Proteins are broken down into amino acids by pepsin in the stomach and proteases in the small intestine.

Fats:
Fats are emulsified by bile and then broken down into fatty acids and glycerol by lipase in the small intestine.

Explanation

Given:

1. The horizontal distance from Ali to the base of the tree = 10 m.
2. The vertical distance from Ali’s eyes to his feet = 1.5 m.
3. The hypotenuse from Ali’s eyes to the top of the tree = 15 m.

Step-by-step solution:

1. Let the height of the tree be $h$. Since Ali’s eyes are 1.5 m above the ground, the height of the tree above Ali’s eyes is $h - 1.5$.

2. Using the Pythagorean theorem in the triangle formed:

   $$$$10^2+(h−1.5)^2=152

3. Simplify:

   $$$$100+(h−1.5)^2=225

4. Subtract 100 from both sides:

   $$$$(h−1.5)^2=125

5. Take the square root of both sides:

   $$h - 1.5 = sqrt{125}$$ $$h-1.5\approx 11.18$$

6. Add 1.5 to both sides to get $h$:

   $$$$h=11.18+1.5=12.68 m

Explanation

Isotopes of an element have the same number of protons.

Explanation

If y is directly proportional to x², it means that:

y ∝ x²

This can be written as an equation:

y = kx²

where k is the constant of proportionality.

Given Information:

We are given that y = m for a particular value of x. Let's call this value x₁.

So, we have:

m = kx₁²

Doubling the Value of x:

Now, we double the value of x. Let's call this new value x₂. So, x₂ = 2x₁.

We want to find the new value of y, let's call it y₂, when x = x₂.

Using the proportionality equation:

y₂ = kx₂²

Substitute x₂ = 2x₁:

y₂ = k(2x₁)²

y₂ = 4kx₁²

Substituting the value of kx₁² from the first equation:

We know that kx₁² = m. So, we can substitute this into the equation for y₂:

y₂ = 4m

Explanation

Fluoride Pollution has negative effects on the joints, bones and causes fluorosis in the teeth.

Explanation

Explanation

Ahmad stands at point D, 2m in front of a spotlight at point A. He is 1.6m tall and is facing the wall of a building which is 10.5m away from him. How tall (BC) is his shadow on the wall of the building (5 marks)

To find the height $BC$ of Ahmad's shadow on the wall of the building, we can use the properties of similar triangles.

Given:

1. Ahmad's height $DE = 1.6$ m.
2. Distance from the spotlight at $A$ to Ahmad at $D$is $2$ m.
3. Distance from Ahmad at $D$ to the wall at $B$ is $10.5$ m.
4. Total distance $AB = 2 + 10.5 = 12.5$m.

Using similar triangles:

$$$$BCAB=DEAD​

Substitute the values:

$$frac{BC}{12.5} = frac{1.6}{2}$$ $$BC = 12.5 times frac{1.6}{2} = 12.5 times 0.8 = 10 text{ m}$$

Height $BC = 10$ m.