Physical Properties of Metals

Q.

What is the hardest metal on earth?

Q.

Which gas is filled in an electric bulb and why? Why is tungsten used in the filament of lamps?

Q.

Exception of Metals and Non metals

Q.

Silver is the best conductor of electricity but copper is used instead of silver for making wires. Why?

Q. Why is aluminium foil is used in packing food.

Q.

What is the definition of non metals?

Q.

Give reason: Why gold and silver are used for making jewellery?

Q.

(a) State five characteristics of metals and five characteristics of non-metals.

(b) State five uses of metals and five uses of non-metals.

Q.

Which of the following can be beaten into thin sheets ? Why ?

(a) Zinc (b) Phosphorus (c) Sulphur (d) Oxygen

Q.

Uses of metals and non-metals in daily life.

Q.

A notebook has lustre while eraser does not.

1. True
2. False

Q.

Which among the following is the best conductor of electricity?

1. Iron

2. Aluminium

3. Silver

4. Copper

Q. What will be formed if you mix zinc sulphate and copper turnings?

1. Copper sulphate
2. Zinc
3. Copper sulphide
4. No reaction

Q. Metals like zinc and aluminium react with sodium hydroxide to produce ____ gas.

1. sulphur dioxide
2. hydrogen sulphide
3. oxygen
4. hydrogen

Q.

Immersion rods for heating liquids are made up of metals. Give reason

Q. The property of metals by which they can be beaten into thin sheets is called ______.

1. Malleability
2. Ductility
3. Lustre
4. Sonority

Q. Why is gold used for making jewellery?

Q.

Write two properties of gold that make it the most suitable metal for ornaments.

Q.

Some properties are listed in the following table. Distinguish between metal and non metals based on these properties

1. Appearance

2. Hardness

3. Malleablity

4. Ductility

5. Heat conduction

6. Condition of electricity

Q. Describe the reaction magnesium +Cooper sulphate gives magnesium sulphate +copper

Q.

Which material is the best conductor? Does it use for electrical transmission? Give reason

Q.

Which one of the following set has two non-metals having shiny and lustrous surface?

1. Graphite and phosphorous

2. Graphite and iodine

3. Iodine and phosphorous

4. Phosphorous and chlorine

Q.

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.

1. Both (A) and (R) are true and (R) is correct explanation of the assertion

2. Both (A) and (R) are true but (R) is not the correct explanation of the assertion

3. (A) is true but (R) is false

4. (A) is false but (R) is true.

Q. Metals can be hammered into thin sheets called foils. The property due to which metal is beaten into thin sheets is called __________.

1. amorphous
2. luster
3. malleability
4. ductility

Q.

What are some non-metals that conduct electricity?

Q. Silver is a bad conductor of electricity.

1. True
2. False

Q. Define Noble metals. Write at least three properties of noble metals by giving examples.

Q.

Which of the following is a semiconductor?

1. Silicon

2. Gold

3. Silver

4. Wood

Q.

As we know that tungsten is not good conductor of heat and electricity so why it is used in electric bulbs

Q. Is tungsten a poor conductor of heat?