Download App

Is Matter Around Us Pure? — Science STD 9 — Question

Maharashtra BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure?3 Marks
Question
How is cream separated form milk?
✓

Answer

Centrifugation is used to separate cream from milk. Milk is a suspension of tiny droplets of oil in a watery liquid. It is put in closed container in a big centrifuge machine. When machine is switched on, milk is rotated at very high speed in its container. The cream being lighter floats over the skimmed milk and then can be removed.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Question Answer (3 Marks)" from Is Matter Around Us Pure?→Is Matter Around Us Pure? — all question types→Science STD 9 question papers→Maharashtra Board STD 9 question papers→Maharashtra Board question paper generator→

Similar questions

The mass of sun is $2 \times 10^{30}\  kg$ and the mass of earth is $6 \times 10^{24}\ kg$. If the average distance between the sun and the earth be $1.5 \times 10^8\  km$, calculate the force of gravitation between them.
→
A body is moving uniformly in a straight line with a velocity of 5m/s. Find graphically the distance covered by it in 5 seconds.
→
A ball of mass $0.5\ kg$ slows down from a speed of $5\ m/s$ to that of $3\ m/s$. Calculate the change in kinetic energy of the ball. State your answer giving proper units.
→
Write any three applications (or use) of ultrasound.
→
A body vibrating with a time-period of $\frac{1}{256}\text{s}$ produces a sound wave which travels in air with a velocity of 350m/s. Calculate the wavelength.
→
Which object is vibrating when the following sounds are produced?
  1. The sound of a sitar.
  2. The sound of table.
  3. The sound of a tuning fork.
  4. The buzzing of a bee or mosquito.
  5. The sound of a flute.
→
Why do we hear more clearly in a room with curtains then a room withour curtains?
→
What type of clothes should we wear in summer? Why?
→
What is meant by the term ‘acceleration’ State the SI unit of acceleration.
→
Calculate the molecular masses of the following:
  1. Hydrogen, $H_2$
  2. Oxygen, $O_2$
  3. Chlorine, $Cl_2$
  4. Ammonia, $NH_3$
  5. Carbon dioxide, $CO_2$
(Atomic masses: $H = 1\ u; O = 16\ u; Cl = 35.5\ u; N = 14\ u; C = 12\ u$)
→