Class 7 Exam > Class 7 Notes > Science (Curiosity) Class 7 - New NCERT > Unit Test: The World of Metals and Non-metals
Unit Test: The World of Metals and Non-metals | Science (Curiosity) Class 7 - New NCERT PDF Download
Time: 1 Hour
Maximum Marks: 30
Instructions:
Attempt all questions.
Question numbers 1 to 5 carry 1 mark each.
Question numbers 6 to 8 carry 2 marks each.
Question numbers 9 to 11 carry 3 marks each.
Question numbers 12 and 13 carry 5 marks each.
Q1. What is the property of a material that allows it to be beaten into thin sheets called? (1 Mark)
a) Ductility
b) Malleability
c) Sonority
d) Conduction
Q2. Name a metal that is liquid at room temperature. (1 Mark)
a) Iron
b) Copper
c) Mercury
d) Aluminium
Q3. Which non-metal is used in water purification to make drinking water safe? (1 Mark)
a) Carbon
b) Nitrogen
c) Chlorine
d) Sulfur
Q4. What is the term for the ringing sound produced by metals when struck? (1 Mark)
a) Brittleness
b) Malleability
c) Ductility
d) Sonority
Q5. What is the brown deposit formed on iron when it reacts with air and water called? (1 Mark)
a) Oxide
b) Rust
c) Alloy
d) Corrosion
Q6. Name two metals that are soft and can be cut with a knife. (2 Mark)
Q7. Name two methods to prevent rusting of iron. (2 Mark)
Q8. Why are vessel handles often made of wood or plastic? (2 Mark)
Q9: Explain why sodium is stored in kerosene and not in water, and describe the nature of its oxide. (3 Mark)
Q10: Compare the properties of metals and non-metals in terms of their appearance and ability to conduct heat and electricity. (3 Mark)
Q11: Explain the difference between conductors and insulators using examples of materials and their applications. (3 Mark)
Q12: Describe the process of rusting in iron, including the conditions required and its impact on iron objects. Suggest two methods to prevent rusting and explain how they work. (5 Mark)
Q13. Explain why metals are used in cooking vessels and electrical wires, while non-metals are used for handles and insulation. Provide one example for each use and describe the properties involved. (5 Mark)
You can find the solutions of this Unit Test here: Unit Test Solutions: The World of Metals and Non-metals
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FAQs on Unit Test: The World of Metals and Non-metals - Science (Curiosity) Class 7 - New NCERT
| 1. What are the main differences between metals and non-metals? |  |
Ans.Metals are typically solid at room temperature (except mercury), have high density, good electrical and thermal conductivity, and are malleable and ductile. Non-metals, on the other hand, can be gases, liquids, or solids at room temperature, have lower densities, poor conductivity, and are generally brittle in solid form.
| 2. What are some common properties of metals? | |
Ans.Common properties of metals include luster (shiny appearance), high melting and boiling points, the ability to conduct heat and electricity, malleability (can be hammered into thin sheets), and ductility (can be drawn into wires). Metals tend to lose electrons during chemical reactions, forming positive ions.
| 3. Can you provide examples of non-metals and their uses? | |
Ans.Some common examples of non-metals include oxygen (used in respiration), nitrogen (used in fertilizers), carbon (used in fuels and as a structural material in forms like graphite and diamond), and sulfur (used in the manufacture of sulfuric acid). Non-metals are essential for life and various industrial processes.
| 4. What is the significance of the periodic table in understanding metals and non-metals? | |
Ans.The periodic table organizes elements based on their atomic number and properties. Metals are typically found on the left side and in the center of the table, while non-metals are located on the right side. This arrangement helps in predicting the behavior of elements, including their reactivity, bonding, and the types of compounds they form.
| 5. How do metals and non-metals react with each other? | |
Ans.Metals and non-metals generally react through the transfer of electrons. Metals tend to lose electrons and form positive ions, while non-metals gain these electrons to form negative ions. This electron transfer leads to the formation of ionic bonds, resulting in the creation of compounds such as sodium chloride (NaCl), where sodium (a metal) donates an electron to chlorine (a non-metal).
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