Physical Properties of Metals
What is the hardest metal on earth?
Which gas is filled in an electric bulb and why? Why is tungsten used in the filament of lamps?
Exception of Metals and Non metals
Silver is the best conductor of electricity but copper is used instead of silver for making wires. Why?
What is the definition of non metals?
Give reason: Why gold and silver are used for making jewellery?
(a) State five characteristics of metals and five characteristics of non-metals.
(b) State five uses of metals and five uses of non-metals.
Which of the following can be beaten into thin sheets ? Why ?
(a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen
Uses of metals and non-metals in daily life.
A notebook has lustre while eraser does not.
Which among the following is the best conductor of electricity?
- Copper sulphate
- Copper sulphide
- No reaction
- sulphur dioxide
- hydrogen sulphide
Immersion rods for heating liquids are made up of metals. Give reason
Write two properties of gold that make it the most suitable metal for ornaments.
Some properties are listed in the following table. Distinguish between metal and non metals based on these properties
5. Heat conduction
6. Condition of electricity
Which material is the best conductor? Does it use for electrical transmission? Give reason
Which one of the following set has two non-metals having shiny and lustrous surface?
Graphite and phosphorous
Graphite and iodine
Iodine and phosphorous
Phosphorous and chlorine
Assertion (A) : The metals and alloys are good conductors of electricity.
Reason (R) : Bronze is an alloy of copper and tin and it is not a good conductor of electricity.
Both (A) and (R) are true and (R) is correct explanation of the assertion
Both (A) and (R) are true but (R) is not the correct explanation of the assertion
(A) is true but (R) is false
(A) is false but (R) is true.
What are some non-metals that conduct electricity?
Which of the following is a semiconductor?
As we know that tungsten is not good conductor of heat and electricity so why it is used in electric bulbs