Correct Answer: B. 66cm²

Explanation

T.S.A of a cone = \(\pi r^2 + \pi rl\)

= \(\frac{22}{7} \times 3^2 + \frac{22}{7} \times 3 \times 4\)

= \(\frac{198}{7} + \frac{264}{7}\)

= \(\frac{462}{7}\)

= 66 cm\(^2\)

Explanation

(c) |XP| = 3.8 cm.

Correct Answer: D. warehousing

Explanation

Warehousing is the act of storing goods that will be sold or distributed later. While a small, home-based business might be warehousing products in a spare room, basement, or garage, larger businesses typically own or rent space in a building that is specifically designed for storage. produced goods are stored ahead of demand by consumers

Correct Answer: D) mouse

Explanation

A plotter is an output device that is used to print large images or designs. A monitor is an output device that displays visual information on a screen. A printer is an output device that prints text and images on paper. Speakers are an output device that produces sound.

The correct answer to this question is option D, which is the mouse. A mouse is an input device that allows the user to control the computer and give it commands.

It is important to know the difference between input and output devices, and which devices fall into each category. Input devices are devices that allow the user to give commands to the computer, such as a keyboard or mouse. Output devices are devices that display information to the user, such as a monitor or printer.

To learn more about input and output devices, please see the relevant sections of your Computer Studies textbook.

Correct Answer: A. 19.5 - 20.4cm

Explanation

In mathematics, numbers ranging from 0.5 - 0.9 are approximated to 1, while 0.1 - 0.4 are taken down to 0.

Correct Answer: D. velocity ratio is always greater than the mechanical advantage

Explanation

The efficiency of a machine (η) is defined as the ratio of work output (W_out) to work input (W_in), usually expressed as a percentage:

η = (W_out / W_in) * 100%

For any real machine, some energy is always lost due to dissipative forces like friction, air resistance, and the generation of heat and sound. This means that the actual work output is always less than the work input (W_out< W_in).

Let's analyze the given options:

• A. work output is always greater than the work input: This statement implies that W_out > W_in, which would mean efficiency is greater than 100%. This violates the law of conservation of energy and is impossible for a real machine. So, option A is incorrect.

• B. load lifted is always greater than the effort applied: This describes a machine with a mechanical advantage (MA) greater than 1 (MA = Load / Effort). While many machines are designed to provide a mechanical advantage, this is not true for all machines (some machines multiply speed or distance, having MA< 1). More importantly, it doesn't explain *why* efficiency is less than 100%. Even machines with MA > 1 still have efficiency less than 100% due to energy losses.

• C. effort applied is always greater than the load lifted: This describes a machine with a mechanical advantage (MA) less than 1. Similar to option B, this is not true for all machines and doesn't explain the reason for efficiency being less than 100%.

• D. velocity ratio is always greater than the mechanical advantage:

Let's recall the relationship between efficiency, mechanical advantage (MA), and velocity ratio (VR):

MA = Load / Effort

VR = Distance moved by Effort / Distance moved by Load

We can also express efficiency as:

η = MA / VR

Since the efficiency of a real machine is always less than 100% (i.e., η< 1), we can write:

MA / VR< 1

This inequality implies that MA< VR, or equivalently, VR > MA.

This statement (VR is always greater than MA) is a direct consequence of the fact that efficiency is less than 100%. The difference between VR and MA represents the energy losses within the machine (e.g., due to friction). For an ideal machine with no energy losses (efficiency = 100%), MA would be equal to VR. But in real machines, friction causes the actual mechanical advantage to be less than the ideal mechanical advantage (velocity ratio), thus making VR greater than MA.

Therefore, option D correctly describes why the efficiency of a machine is always less than 100%.

The final answer is D

Correct Answer: C. 2.0

Explanation

Windows 2.0 allowed application windows to overlap each other, unlike its predecessor Windows 1.0, which could display only tiled windows. Windows 2.0 also introduced more sophisticated keyboard-shortcuts and the terminology of Minimize and Maximize, as opposed to Iconize and Zoom in Windows 1.0. It was also the last version of Windows that did not require a hard disk. With the improved speed, reliability and usability, computers now started becoming a part of daily life for some workers. Desktop icons and use of keyboard shortcuts helped to speed up work

Explanation

(ai) Fermentation is the conversation of aqueous glucose or sugar to ethanol/alcohol and release of carbon (iv) oxide as a by product. Alternatively, it is the decomposition or breakdown of glucose/starch/carbohydrate to ethanol/alcohol and release of carbon (iv) oxide

(aii) Zymase

(b) -The strength of an acid

-The PH of the solution

(c) Fe + H\(_2\)SO\(_4\) -> FeSO\(_4\) + H2 mass of unreacted iron calculated below;

No. of moles of H\(_2\)SO\(_4\) = 10cm\(^3\)

Concentration = 1mol/dm\(^3\)

Amount = Vol x Concentration

= \(\frac{10}{100}\) x 1

= 0.01mol

1 mole of H\(_2\)SO\(_4\) = 1 mole of Fe

Mass of Fe reacted = 56 x 0.01g = 0.56g

Mass of unreacted Fe = (5.0 - 0.056)g = 4.44g

(di) tetraoxsulphate (iv)

(dii). dyes

(e) A catalyst increases the rate of reaction by lowering the activation energy of the reaction

(fi) CH\(_3\)COOH\(_{(s)}\) + NH3\(_{(g)}\) → CH\(_3\)COONH\(_4\)

(fii) Ammonium ethanoate

(g) (a) It doesn’t corrode easily.

(b) it doesn’t react with contain inside.

(c) It can stand for a long period of time.

(h) (a) Sweet production industries

(b) perfume industries.

(i) (a) Evaporation

(b)seedling

(j) (a) it increases the volume water in ocean and seas.

(b) It causes increase in rainfall and also corrode painted surfaces

Correct Answer: B. Lake Nyos

Correct Answer: C) Public relations

Explanation

Marketing concept is a philosophy that focuses on understanding and meeting the needs and wants of customers through product development, pricing, promotion, and distribution. Advertising is a form of communication that aims to persuade potential customers to buy a product or service. Sales promotion is a short-term strategy used to boost sales through discounts, giveaways, or other incentives.

The correct option is Public relations. Public relations is the process of managing the reputation of an organization through communication with stakeholders such as customers, employees, investors, and the media. It involves creating a positive image of the company and maintaining good relationships with stakeholders. This can be done through various means such as press releases, social media, and events.

Establishing and maintaining mutual understanding between a company and its customers is crucial for long-term success. Good public relations can help to create a positive image of the company, increase customer loyalty, and attract new customers. It involves communicating with customers in a way that is honest, transparent, and respectful.

In conclusion, the correct answer to this question is Public relations. This refers to the process of building and maintaining a good relationship between a company and its customers through communication and other means. It is important for creating a positive image of the company and increasing customer loyalty.