Tamil Nadu Board Solutions for Chapter: Measurement, Exercise 1: Evaluation

There are three spheres A, B, C as shown below:

Sphere A and B are made of the same material. Sphere C is made of a different material. Spheres A and C have equal radii. The radius of sphere B is half that of A. Density of A is double that of C. 
Find the ratio of volumes of spheres A and B.

There are three spheres A, B, C as shown below:

Sphere A and B are made of the same material. Sphere C is made of a different material. Spheres A and C have equal radii. The radius of sphere B is half that of A. Density of A is double that of C. Find the ratio of masses of spheres A and C.

A circular disc has a radius $10 \mathrm{cm}$. Find the area of the disc in${\mathrm{m}}^2$. (Use $\pi =3.14$). 

The dimension of a school playground is$800 \mathrm{m}\times 500 \mathrm{m}$. Find the area of the ground. 

Two spheres of the same size are made from copper and iron respectively. Find the ratio between their masses. Density of copper $8,900 \mathrm{kg}/{\mathrm{m}}^3$and iron$7,800 \mathrm{kg}/{\mathrm{m}}^3$.

A liquid having a mass of $250 \mathrm{g}$ fills a space with $1000 \mathrm{cc}$. Find the density of the liquid. Write the answer is in two significant figures.

A sphere of radius $1 \mathrm{cm}$ is made from silver. If the mass of the sphere is $33 \mathrm{g}$, find the density of silver. (Take $\pi = 3.14$). Write the answer is in four significant figures.

Crossword puzzle:

CLUES – ACROSS
1. SI unit of temperature.
2. A derived quantity.
3. Mass per unit volume.
4. Maximum volume of liquid a container can hold.

CLUES – DOWN
a. A derived quantity.
b. SI unit of volume.
c. A liquid denser than iron.
d. A unit of length is used to measure very long distances.