Question : The radius of a metallic spherical ball is 3 cm. If the metallic ball is melted and recast into $x$ number of hemispheres of radius equal to half the radius of the metallic spherical ball, then find the value of $x$.

Option 1: 15

Option 2: 14

Option 3: 16

Option 4: 13

Question : $(0.5\times5+0.25\times0.5+0.5\times4+0.5\times0.75)$ is equal to:

Option 1: $5$

Option 2: $10$

Option 3: $15$

Option 4: $20$

Question : The nucleus of an atom consists of

Option 1: Proton

Option 2: Neutron

Option 3: Proton, and Neutron

Option 4: Electron, Proton, and Neutron

Question : What are the components of the nucleus of an atom?

Option 1: Only protons

Option 2: Protons and neutrons

Option 3: Neutrons and electrons

Option 4: Only neutrons

Question : If 30% of (B – A) = 18% of (B + A), then the ratio A : B is equal to:

Option 1: 4 : 1

Option 2: 1 : 4

Option 3: 5 : 4

Option 4: 5 : 9