Science Past Paper PDF

Science **Multiple Choice Questions (MCQs)** 1. Which of the following elements is in Group 2 and Period 3 of the periodic table? - a\) Oxygen (O) - b\) Sodium (Na) - c\) Magnesium (Mg) - d\) Carbon (C) 2. Which of the following is a property of non-metals?...

Science **Multiple Choice Questions (MCQs)** 1. Which of the following elements is in Group 2 and Period 3 of the periodic table? - a\) Oxygen (O) - b\) Sodium (Na) - c\) Magnesium (Mg) - d\) Carbon (C) 2. Which of the following is a property of non-metals? - a\) Shiny appearance - b\) High electrical conductivity - c\) Brittle in the solid state - d\) Malleable and ductile 3. What is the group number of Phosphorus (P) in the periodic table? - a\) Group 1 - b\) Group 3 - c\) Group 5 - d\) Group 7 4. **Element X** is shiny, conducts electricity, and can be easily hammered into different shapes. Which type of element is **Element X** likely to be? - a\) A non-metal - b\) A metalloid - c\) A metal - d\) A noble gas  **Which of the following is a typical property of metals?** - a\) Poor conductor of heat - b\) Brittle - c\) Ductile and malleable - d\) Low density  **Non-metals are usually:** - a\) Good conductors of heat - b\) Found in solid state only - c\) Shiny and malleable - d\) Poor conductors of electricity  **Which element is commonly used in airplanes and cars due to its light weight and strength?** - a\) Iron - b\) Aluminum - c\) Gold - d\) Lead  **What property makes copper ideal for use in electrical wiring?** - a\) Its light weight - b\) Its ability to conduct electricity efficiently - c\) Its non-reactive nature - d\) Its magnetic properties #### **True or False** 1. Metals are typically good conductors of electricity and heat.\ **True / False** 2. All metals are in the liquid state at room temperature.\ **True / False** 3. Non-metals are generally brittle and poor conductors of electricity.\ **True / False** 4. The majority of elements in the periodic table are metals.\ **True / False** 5.  All metals can be hammered into thin sheets or pulled into wires.\ **True / False** 6.  Non-metals generally have a shiny appearance and are good conductors of electricity.\ **True / False** 7.  Aluminum is heavier than iron but is used in cars due to its high strength.\ **True / False** 8.  Most non-metals are gases at room temperature.\ **True / False** **Fill in the Blanks** A material that is both ductile and malleable is most likely a \_\_. The element \_\_ is known for its role in respiration and is essential for life. \_\_ is a non-metal that can exist in different forms, including graphite and diamond. When choosing materials for electrical wiring, \_\_ is often selected due to its excellent electrical conductivity. Magnesium (Mg) is in Group \_\_ and Period \_\_ of the periodic table. Elements that have similar properties are arranged in the same \_\_ of the periodic table. Metals are generally \_\_ (good/poor) conductors of heat and electricity. Non-metals are typically \_\_ (shiny/dull) in appearance and are often found in the \_\_ (solid/liquid/gas) state. **Short Questions** A scientist is experimenting with a new metal alloy and notices that the alloy is light and has a lower density compared to other metals. Which element might have been used in this alloy, and what property of this element makes the alloy light? During a demonstration, a piece of copper wire is heated, and it conducts electricity efficiently without any noticeable change in its appearance. Explain why copper is often used in electrical wires based on its properties. You are tasked with selecting a material for making a sculpture that will be placed outdoors. The material needs to be strong, able to conduct heat, and resistant to environmental damage. Would you choose a metal or non-metal for this purpose? Justify your answer with the properties of the material. A chemist is testing two elements. One element is shiny, conducts electricity, and can be shaped into wires. The other element is dull, brittle, and does not conduct electricity. Based on these observations, classify each element as either a metal or a non-metal, and explain why. In a factory, materials used for making cooking utensils need to withstand high temperatures and conduct heat efficiently. Would you choose a metal or a non-metal for this purpose? Justify your answer with material properties. A new material is discovered. It is not shiny, and it shatters when struck with a hammer, but it is essential for living organisms to breathe. Is this material likely to be a metal or a non-metal? Name a possible element that matches this description. Match the elements with their typical properties: **Element** **Property** ------------- ---------------------------------------------------- Copper a\) Good conductor of electricity Oxygen b\) Essential for respiration Aluminum c\) Lightweight and used in aircraft manufacturing Carbon d\) Forms graphite and diamond structures Sulfur e\) Yellow solid, brittle, and used in fertilizers