A hemispherical bowl just floats without sinking in a liquid of density 1.2103kg/m3

Explanation:
According to the law of floatation, when a body floats,
Weight of the body = Weight of the liquid displaced
 Vbbg= Vllg (Vb = Volume of body, Vl= Volume of liquid displaced, b= Density of body, l= Density of liquid)
 23 R3-r32104= 23 R31.2103(R is outer radius and r is inner radius)
 r=0.98R
 2r=0.982R=0.981m=0.98m (2R = 1m)
So the inner diameter is 0.98m



Final answer:
 Hence the correct option is C, i.e. 0.98 m