Q1. The coating on electric wires prevents:
Q2. Lead and mercury are:
Q3. Which property allows a metal to be hammered into thin foil without breaking?
Q4. Non-metals are generally:
Q5. The shining surface of metals is called:
Q6. Why is copper preferred over wood for making electrical wiring?
Q7. The easiest way to start grouping substances is by comparing their:
Q8. The hardness of metals:
Q9. A wire of about 2 km can be drawn from:
Q10. Cooking vessels are usually made of metals because they:
Q11. Which of the following non-metals is a good conductor of electricity?
Q12. Metals can be drawn into thin wires due to:
Q13. Metals like copper and aluminium are available in the form of:
Q14. The shape of metals changes when hammered due to:
Q15. The study of metals and non-metals begins with their:
Q16. Metals that produce sound on striking are called:
Q17. Which property helps metals conduct heat in cooking vessels?
Q18. The term sonorous is related to:
Q19. Before testing electrical conductivity, why are metal samples cleaned with sandpaper?
Q20. Which property allows metals to be beaten into thin sheets?
Q21. School bells are made of metals because metals are:
Q22. Metals can be given different shapes because of their:
Q23. The most malleable metals are:
Q24. Non-metals are generally:
Q25. Which set contains only non-metals?
Q26. Non-metals generally do not show:
Q27. Most non-metals are found in:
Q28. Electric wires are coated with PVC because PVC is a:
Q29. Metals usually produce sound because they are:
Q30. Metals in their pure state generally have a:
Q31. Which non-metal is essential for respiration and is a poor conductor of electricity?
Q32. The best conductors of heat are:
Q33. In a typical NCERT activity, which property is tested by hammering a metal piece?
Q34. Metals like iron and copper are used for utensils mainly because they:
Q35. Which material is used to coat electric wires?
Q36. Metals generally are:
Q37. What does a glowing bulb in a simple electric circuit with a metal sample indicate?
Q38. Metals are usually:
Q39. Metals are good conductors of:
Q40. Sodium metal should always be handled with:
Q41. The only non-metal that exists in liquid state is:
Q42. Why is sodium metal stored under kerosene oil?
Q43. Which of the following is a characteristic property of most metals?
Q44. Activity 7.7 compares:
Q45. In an electrical conductivity test, if the bulb does not glow, the material is likely a:
Q46. Which of the following is a non-metal?
Q47. Which property is NOT shown by most non-metals?
Q48. Sodium metal is dried by pressing it between:
Q49. Which statement is true about the melting points of metals and non-metals?
Q50. The most ductile metal is: