1. | \(D\) | 2. | \(A\) |
3. | \(B\) | 4. | \(C\) |
The correct statement about the variation of viscosity of fluids with an increase in temperature is:
1. | viscosity of gases decreases. |
2. | viscosity of both liquids and gases increases. |
3. | viscosity of liquids increases. |
4. | viscosity of liquids decreases. |
The velocity of a small ball of mass \(M\) and density \(d\), when dropped in a container filled with glycerine becomes constant after some time. If the density of glycerine is \(d\over 2\) then the viscous force acting on the ball will be:
1. | \(\frac{3Mg}{2}\) | 2. | \(2Mg\) |
3. | \(\frac{Mg}{2}\) | 4. | \(Mg\) |
Two small spherical metal balls, having equal masses, are made from materials of densities \(\rho_1\) and \(\rho_2\) such that \(\rho_1=8\rho_2\)
1. \(\dfrac{79}{72}\)
2. \(\dfrac{19}{36}\)
3. \(\dfrac{39}{72}\)
4. \(\dfrac{79}{36}\)