1. Very tough
2. Less tough
3. Denser
4. Tighter
Less tough
1. Brittle
2. Ductile
3. Tighter
4. All of these
Ductile
1. Brass
2. Bronze
3. Lead
4. Zinc
Brass
1. Copper and zinc
2. Copper and tin
3. Copper, tin and zinc
4. None of these
Copper and tin
1. 60% copper and 40%zinc
2. 50% copper and 40%zinc
3. 60.45% copper, 35.2% zinc and 4.35% nickel
4. 70% copper and 30%zinc
60.45\% copper, 35.2\% zinc and 4.35\% nickel
1. 1% silver
2. 5% silver
3. 10% silver
4. No silver
No silver
1. Copper and tin
2. Lead and tin
3. Lead and copper
4. Aluminum and cooper
Lead and tin
1. Muntz metal
2. Gun metal
3. Delta metal
4. None of these
Muntz metal
1. 60% copper and 40% zinc
2. 50% copper and 50% zinc
3. 70% copper and 30% zinc
4. 80% copper and 20% zinc
60\% copper and 40\% zinc
1. Muntz Meta
2. Gun metal
3. Delta metal
4. None of these
Gun metal