Question : Isobars have ______.

Option 1: Same mass number but different atomic numbers

Option 2: Different mass numbers but same atomic numbers

Option 3: Same mass and atomic numbers

Option 4: Different mass and atomic numbers

Question : A cone and a cylinder with equal radii have equal volumes. The ratio of their heights is:

Option 1: 2 : 3

Option 2: 3 : 4

Option 3: 1 : 2

Option 4: 3 : 1

Question : The sum of two numbers is thrice their difference, their ratio is:

Option 1: 1 : 2

Option 2: 2 : 1

Option 3: 3 : 1

Option 4: 1 : 3

Question : Which of the following are members of 15 naturally occurring metallic chemical elements whose atomic numbers are between 57 and 71?

Option 1: Alkali metals

Option 2: Lanthanides

Option 3: Halogens

Option 4: Actinides

Question : The mercury and sodium street lamps light up because of:

Option 1: Atomic emission

Option 2: Atomic absorption

Option 3: Electron emission

Option 4: Electron absorption