Rules of Sinking and Floating

Q.

A cork floats in water, while the iron nail sinks. Give reason

Q.

A body of density $4.5g/c{m}^3$ will float on water.

1. True
2. False

Q.

When does a body float in a liquid?

1. When the density of the object is less than that of the liquid.
2. When the weight of the object is greater than buoyant force.
3. When the density of the object is greater than that of liquid.
4. When the volume of liquid displaced by the object is equal to the volume of the body.

Q. A block of iron sinks in fluid A but floats in another liquid B. Choose the correct option.

1. Density of fluid A > Density of fluid B
2. Density of fluid A = Density of fluid B
3. Density of fluid A < Density of fluid B

4. Density of fluid A $\ge$ Density of fluid B

Q.

why does an iron needle sink in water, but not an iron ship? anyone know the answer.

Q. The density of a substance is $0.5gc{m}^{-3}$. The substance _______.

1. sinks in water
2. floats in water
3. remains at original position
4. oscillates

Q. A piece of wood having dimensions $1m\times 2m\times 3m$ has $2kg$ mass. What is the density of wood? Would the wood float in water?
(density of water= $1000kg{m}^{-3}$)

1. $3\times {10}^{-3}kg{m}^{-3}$, No

2. $3kg{m}^{-3}$, Yes
3. $0.33kg{m}^{-3}$, Yes
4. $0.33\times {10}^{-3}kg{m}^{-3}$, No