Question : Determine the total surface area of a hemisphere closed at the bottom. Radius of the hemisphere is $\sqrt{\frac{25}{\pi}}$ unit.

Option 1: 75 unit²

Option 2: 70 unit²

Option 3: 60 unit²

Option 4: 50 unit²

Question : The radius of circle A is twice that of circle B and the radius of circle B is twice that of circle C. Their area will be in the ratio:

Option 1: 16 : 4 : 1

Option 2: 4 : 2 : 1

Option 3: 1 : 2 : 4

Option 4: 1 : 4 : 16

Question : Which of the following is the correct statement?

Option 1: Joule is the unit of work

Option 2: The unit of energy is the watt.

Option 3: Joule/ second is also a unit of energy.

Option 4: The unit of power is joule/newton.

Question : Who co-invented the device called Cyclotron in 1934 along with Ernest Lawrence to investigate the nuclear structure?

Option 1: Joseph John Thomson

Option 2: Ernest Rutherford

Option 3: Milton Stanley Livingston

Option 4: Enrico Fermi

Question : Three equal circles of unit radius touch one another. Then the area of the circle circumscribing the three circles is:

Option 1: $6 \pi (2+ \sqrt3)^2$

Option 2: $\frac{\pi}{6} (2+ \sqrt3)^2$

Option 3: $\frac{\pi}{3} (2+ \sqrt3)^2$

Option 4: $3\pi (2+ \sqrt3)^2$