Science True-False

True.

False.
Correct statement: For making ornaments, 22 – carat gold is used which contains 22 parts of gold by weight and 2 parts of copper by weight.

true

False.
Correct statement: For making ornaments, 22 – carat gold is used which contains 22 parts of gold by weight and 2 parts of copper by weight.

True.

False.
Correct statement: The strategic metals such as titanium, chromium manganese, zirconium are used in the manufacturing of defence equipment.

False.
Correct statement: Copper was the first metal to be used in making utensils and weapons.

True.

False.
Correct statement: In a period, the metallic character of the element decreases while their non-metallic character increases.

False.
Correct statement: The atomic size of the elements in a period decreases from left to right.

True.

True.

False.
Correct statement: The first period in the periodic table is the shortest period and contains 2 elements Hydrogen and Helium.
(OR)
The second period in the periodic table is the short period and contains 8 elements from Lithium to Neon.

False.
Correct statement: The long form of periodic table consists of horizontal rows called periods and vertical columns called groups.

True.

true

False.
Correct Statement: Copper alloyed with gold and silver for making coins and jewels.

False
Correct Statement: Copper pyrite ore is concentrated by froth floatation process.

False.
Correct Statement: As the positive charge increases, the size of the cation also decreases.

True.

False.
Correct Statement: Noble gases are less reactive.

True.

False.
Correct Statement: First period contains two elements.(Hydrogen & Ftelium)