Floatation

Q.

A balloon filled with helium or hydrogen gas goes vertically upward into the sky. Does it infinitely keep on going up?

1. No

2. Yes

Q.

The density of seawater is approximately $1.025kg/m^3$. Will it be easier to float in seawater or freshwater? Give a reason for your answer.

Q.

State the law of floatation.

Q. Explain briefly why a balloon filled with helium gas rises in air. Why does the balloon rise to a particular height above the ground and does not rise further.

Q.

No person can drown in the Dead Sea.

1. True

2. False

Q.

Density of water is 1000 kg/m³ at _____________.

Q.

Why does a stone sink when placed in water, whereas a cork floats on the surface of water?

Q.

Write any three applications of floatation.

Q.

State the principle of floatation.

Q.

An iceberg of density ${\rho }_{ice}=900\frac{\text{kg}}{{\text{m}}^3}$ Is Floating In Water Of Density ${\rho }_{water}=1000\frac{\text{kg}}{{\text{m}}^3}$. What Will Be The Percentage Of Volume Of Ice-cube Outside The Water?

Q.

A ship is able to float in water because its weight is same as the weight of the water it displaces.

1. False

2. True

Q. A piece of lead weighs 100g in water.If density of lead is 11g/cm3 then weight of the piece of lead in air is?

Q. A sealed cane of mass 600g has a volume of 500cm(cube)
Will this Cane sink in water

Q.

Find the surface energy of water kept in a cylindrical vessel of radius 6 cm. Surface tension of water = 0.075 J/m²

1. 6.5 × 10^-4 J

2. 8.5 × 10^-3 J

3. 8.5 × 10^-4 J

4. 8.5 × 10^-5 J

Q.

What can you say about the average density of a ship floating on water in relation to the density of water ?

Q. If the time of fall of two objects are in the ratio 1:2. Find the ratio of the height from which they fall?

Q. An egg just sinks when dropped in a container filled with water. If common salt is added to the water then

1. the egg breaks

2. the volume of the liquid decreases

3. the egg stays as it is

4. the egg floats up

Q. An egg sinks in fresh water but floats in highly salty water. Give reason.

Q.

State the condition for an object to float on the surface of a liquid.

Q. Question 5
An object is put one by one in three liquids having different densities. The object floats with $\frac{1}{9}$, $\frac{2}{11}$ and $\frac{3}{7}$ parts of their volumes outside the liquidsurface in liquids of densities $d_1$, $d_2$ and $d_3$ respectively. Which of the following statement is correct?

(a) $d_1$ > $d_2$ > $d_3$
(b) $d_1$ > $d_2$ < $d_3$
(c) $d_1$ < $d_2$ > $d_3$
(d) $d_1$ < $d_2$ < $d_3$

Q.

A body will sink ____________in pure water than in sea water .

Q.

The law of floatation states that a floating object displaces a fluid such that weight of the displaced fluid is equal to the weight of the object.

1. True

2. False

Q. Give me some tips to find equivalent mass of any substance easily

Q.

A submarine can either sink or float even though the upthrust acting on it is the same. What is the relationship between the weight of the submarine and the upthrust when the submarine sinks in water?

1. Weight of submarine < Upthrust.

2. Weight of submarine > Upthrust.

3. Weight of submarine $\le$ Upthrust.

4. Weight of submarine = Upthrust.

Q.

Density of a body is 800$\frac{kg}{m^3}$.will it float or sink in water ?

Q.

…………expansion is the increase in the area of a solid when heat is supplied to it.

Q.

What are the laws of flotation in a liquid? Give some illustrations.

Q.

A metal ball of $0.20\mathrm{kg}$ and at $200°C$ when placed on an ice block melts $100\mathrm{g}$ of ice when its temperature stops falling. If specific latent heat of ice is $340{\mathrm{Jg}}^{-1}$. Calculate the specific heat capacity of the metal ball.

Q. Dear sir,

Please help me with this questions.

1) An object is suspended with a string which gets streched. When the object is completely immersed in water, the extension of string decreases. explain why it happens?

2) A rocket can move in airfree space but a jetplane cannot. Why?

Thank you & Best Regards,
Adwaith

Q.

Floating ice is less submerged in seawater than in fresh water because the density of seawater is more.

1. True

2. False