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Q2A. Three ways of preventing computer crime are: 1. Using strong and unique passwords. 2. Installing and regularly updating antivirus software. 3. Being cautious while clicking on suspicious links or downloading files from unknown sources. B. Two corrective measures of computer data loss are: 1. Attempting to recover lost data using data recovery software. 2. Restoring lost data from a backup storage medium.

Q1 💯💯 A backup storage medium is a device or medium used to store copies of data for safekeeping, such as external hard drives, tapes, or cloud storage. B. Backup storage is necessary on a computer for two reasons: data protection against hardware failures and the ability to recover from accidental deletion or data corruption. 1c. Two examples of backup storage media are external hard drives and cloud storage services. 1cii. Two features of primary storage media are fast access speed and direct interaction with the computer's processor.

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2 . D Have no charge 3.holes are majorly charges carriers 4. A. eight times the frequency of the other. 5. D. wavelengths and frequencies. 6. B 250W 7. C 8. A 800 ms 9. B decreases 11. B x rays 12. D reflection of sound 16. A NEURON 17. C. resonance frequency. 18. C. durability of the wire. 21. A. electric potential. 22. C. thermal capacity. 23. C. holes are the majority charge carriers. 25.nuclear fusion. 26. D. Colour 29 . C. virtual. 30. B 10 cm 32. C. direction of the force on a current carrying conductor in a magnetic field. 33. B. Copper, steel and iron

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12. d. (i) The function of a control rod in a nuclear reactor is to regulate the rate of fission reactions by absorbing neutrons. By inserting or withdrawing control rods, the reactor's power output can be adjusted. (ii) The function of a coolant in a nuclear reactor is to remove heat generated by the fission process. It circulates through the reactor core, absorbing heat and transferring it to a heat exchanger, where the heat is used to produce steam for generating electricity.

12. a. Sure! Here are two features of nuclear fission: 1. In nuclear fission, a heavy nucleus is split into two or more smaller nuclei. 2. This process releases a large amount of energy and can be self-sustaining. And here are two features of nuclear fusion: 1. In nuclear fusion, two or more light nuclei combine to form a heavier nucleus. 2. Fusion reactions release even more energy than fission and are the process that powers the sun.

8. a . Mass refers to the amount of matter in an object, while weight is the force exerted on an object due to gravity. 8c (I) Simple harmonic motion is a type of motion where an object oscillates back and forth around a central equilibrium position.

Question number 8 solutions ✅💯💯✅✅ Mass and weight are two different concepts in physics. Mass refers to the amount of matter in an object and is measured in kilograms (kg). It is a scalar quantity and is independent of the object's location. Weight, on the other hand, refers to the force of gravity acting on an object and is measured in newtons (N). It is a vector quantity and depends on the object's mass and the acceleration due to gravity. The formula for weight is given by W = mg, where W is the weight, m is the mass, and g is the acceleration due to gravity. Now, let's move on to the second part of your question about the mutual force, F, between two bodies. The method of dimensions can be used to obtain the formula for F in terms of mass, distance of separation, and the universal gravitational constant, G. Using the method of dimensions, we can start by looking at the units of each quantity involved. The unit of force (F) is the newton (N), which can be expressed in terms of its base units: kg·m/s^2. The unit of mass (m) is the kilogram (kg). The unit of distance (d) is the meter (m). The unit of the universal gravitational constant (G) is N·m^2/kg^2. Now, let's compare the dimensions of each quantity: [F] = [m]·[d]·[G] Based on these dimensions, the formula for F in terms of mass (m), distance (d), and the universal gravitational constant (G) is: F = l · m · d · G Where l represents the dimensionless constant. I hope this clarifies the distinction between mass and weight and explains how to derive the formula for the mutual force between two bodies. Let me know if you have any further questions or if there's anything else I can help you with. Question number 8 ✅💯💯✅✅

10a.Here are three differences between umbra and penumbra: 1. Definition: The umbra refers to the darkest and central part of a shadow where all light is blocked, while the penumbra is the partially shaded outer region of a shadow where some light is still present. 2. Size: The umbra is smaller and more concentrated, as it represents the area directly behind the object causing the shadow. In contrast, the penumbra is larger and less defined, extending beyond the umbra and representing a region of partial shadow. 3. Light intensity: In the umbra, no direct light reaches the area, resulting in complete darkness. In the penumbra, the light is partially blocked, leading to a gradual decrease in light intensity from the outer edge of the shadow towards the umbra.

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