NIRMALA MATHA MATRICULATION HR SEC SCHOOL
CLASS: VI
TIME: 1:30 HRS
SUB : SCIENCE-1
MARKS 25
1: ANSWER IN SHORT :- (5 X 3 = 15)
1) Differentiate loading and sedimentation
2) What is saturated solution? What happens when you heat
a saturated solution.
3) Why is burning of sugar a chemical change?
4) Write any three advantages of using Sl units
5) What is vibratory motion? Give an example
Answers
1 ans-Sedimentation is setting down of a substance generally in a liquid medium whereas loading is a process of making sedimentation faster. Loading can be seen when it rains. The rain drops make the dust particles to settle on ground faster.
2 ans- When a saturated solution is heated, it becomes capable of dissolving more solute. That is, on heating a saturated solution becomes unsaturated and is able to dissolve more solute.
3 ans- Burning a sugar cube is a chemical change. Fire activates a chemical reaction between sugar and oxygen. The oxygen in the air reacts with the sugar and the chemical bonds are broken.
4 ans- SI is coherent system of units, i.e., a system based on certain set of fundamental units. (ii) SI is rational system of units. i.e., it assigns only one unit to a particular physical quantity. (iii) SI is metric system, i.e., multiples and sub-multiples of the system can be expressed as a power of 10.
5 ans - Few examples of vibration motions are
vocal Chord Movement. A sound wave travels a manner of longitudinal waves that generate vibratory motion. String movement in stringed instruments such as the sitar, guitar, etch and so on. The motion of mobile phones in vibration.