Question : The radius of a hemisphere is twice that of a sphere. What is the ratio of the total surface area of the hemisphere and sphere?

Option 1: 3 : 1

Option 2: 12 : 1

Option 3: 4 : 1

Option 4: 6 : 1

Question : The weight of an object on the moon is equal to ______ of its weight on the earth.

Option 1:  1/10th

Option 2: 1/6th

Option 3: 1/8th

Option 4: 1/4th

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 : What is the distance between a crest and a consecutive trough in a transverse wave?

Option 1: Wavelength

Option 2: Amplitude

Option 3: Half of the wavelength

Option 4: Twice of wavelength

Question : Rate of cooling depends on the:

Option 1: temperature difference between the body and the surrounding

Option 2: nature of the radiating surface

Option 3: area of the radiating surface

Option 4: all of these