Density

Q.

What is Eureka can? How would you use it to determine the density of an irregular solid?

Q.

A heater, rated $1000W$, is used to heat $1.5kg$ of water at $40°C$ to its boiling point. Calculate the time in which the water starts to boil. Specific heat capacity of water is $4200JK{g}^{-1}°C^{-1}$.

Q. 2 kg of ice melts when water at ${100}^{\circ }\text{C}$ is poured in a hole drilled in a block of ice. What mass of water was used?
Given: Specific heat capacity of water is $4200Jk{g}^{-1}{K}^{-1}$, specific latent heat of ice is$336\times {10}^{3}JK{g}^{-1}$.

Q.

A heavy body has more mass per unit volume than a lighter body, i.e. it has lesser density.

1. True
2. False

Q. Why is the base of a cooking pan made thick and heavy?​

Q.

Question 26 (b)
(b) A ball weighing 4 kg of density $4000kg{m}^{–3}$ is completely immersed in water of density ${10}^{3}kg{m}^{–3}$ Find the force of buoyancy on it. (Given $g=10m{s}^{–2})$.

Q.

How will you find the density of an irregular solid using Eureka can? Explain with a diagram.

Q. Which of the following is necessarily required to measure the density of irregular immiscible solids?

1. Spring balance
2. Measuring cylinder
3. Water
4. Pipette

Q.

You are provided with a glass stopper and common laboratory equipment. How will you proceed to find its density ?

Q.

The density of mercury is $13.6gc{m}^{-3}$and the density of water is $1gc{m}^{-3}$. Determine the ratio of mass of mercury and water when volumes are equal.

1. $1:13.6$

2. $13.6:1$

3. $2:13$

4. $13.2:6$

Q. If 5 litres of kerosene has a mass of 5 kg, then what is the density of kerosene?

1. 500 kg/$m^3$
2. 1000 kg/$m^3$
3. 50 kg/$m^3$
4. 100 kg/$m^3$

Q. $10$ g of ice at 0${}^o$C absorbs $5460$ J of heat energy to melt and change to water at $50$${}^o$C. Calculate the specific latent heat of fusion of ice. Specific heat capacity of water is $4200$ J kg${}^{-1}$ K${}^{-1}$

1. 136 J g${}^{-1}$
2. 336 J g${}^{-1}$
3. 236 J g${}^{-1}$
4. 436 J g${}^{-1}$

Q. The base of a cylindrical vessel is $300{cm}^2$. Water is poured into it upto a depth of $6cm$. What will be the thrust acting on the base (in Newtons) ? Take density of water $=1000kg$ $m^{-3}$ and $g=10m$ $s^{-2}$

Q.

A liquid P of specific heat capacity $1800Jk{g}^{-1}{K}^{-1}$and at $80°C$is mixed with liquid R of specific heat capacity$1200Jk{g}^{-1}{K}^{-1}$and at$30°C$. After mixing the final temperature of the mixture is$50°C$. In what proportion by weight are the liquids mixed?