SECTION A - MCQ
1. I've learnt that time at 80 degree celsius should be minus off by the time at 100 degree celsius instead of minusing from the time at 20 degree celsius.
CORRECT ANSWER : A (1 MIN 54S)
6. I've learnt that the equation is (acid + base -> salt + water ) instead of (acid + base -> salt + hydrogen).
CORRECT ANSWER ; D (WATER)
9.I've learnt that a solid object with lower density will always sink when placed in a liquid with higher density is incorrect and density of same substance is the same regardless of size and shape.
CORRECT ANSWER ; C ( 1 , 2 , 3)
18.I've learnt that the method of seperation used to transform sea water into drinkable water is Reverse Osmosis.
CORRECT ANSWER ; D (REVERSE OSMOSIS)
SECTION B - SHORT ANSWER QUESTIONS
2a.I've learnt that to test if saliva is alkaline , we can dip red litmus paper into a sample of saliva and the results would show that the red litmus paper changes to blue.
3c.I've learnt that at a same temperature , the volume of a body will not change.
3d. 0.66kg is equal to 660g, therefore take 660g divide by 50cm3 to get the density the rock.
3e. Take 1000 times 13.2g/cm3 (density of rock) to get the density of the rock in k/m3.
3f. I've learnt that the density of a rock from space is same as the density in earth.
4f.The density of part Q remains at 7750kg/m3 , remaining the same , density is calculated from m/v.
4d.Part P floats on mercury , therefore the density of part P is less than that of mercury.
5c.Orange dye is amixture as it is made up of more than 2 substances that are not chemically combined together.
5d.The original drop of dye would dissolve into the water and separation of its component cannot happen if it had been placed below the water level.
6c. Red Cabbage can be used as a natural indicator for acids and alkalis.
1. I've learnt that time at 80 degree celsius should be minus off by the time at 100 degree celsius instead of minusing from the time at 20 degree celsius.
CORRECT ANSWER : A (1 MIN 54S)
6. I've learnt that the equation is (acid + base -> salt + water ) instead of (acid + base -> salt + hydrogen).
CORRECT ANSWER ; D (WATER)
9.I've learnt that a solid object with lower density will always sink when placed in a liquid with higher density is incorrect and density of same substance is the same regardless of size and shape.
CORRECT ANSWER ; C ( 1 , 2 , 3)
18.I've learnt that the method of seperation used to transform sea water into drinkable water is Reverse Osmosis.
CORRECT ANSWER ; D (REVERSE OSMOSIS)
SECTION B - SHORT ANSWER QUESTIONS
2a.I've learnt that to test if saliva is alkaline , we can dip red litmus paper into a sample of saliva and the results would show that the red litmus paper changes to blue.
3c.I've learnt that at a same temperature , the volume of a body will not change.
3d. 0.66kg is equal to 660g, therefore take 660g divide by 50cm3 to get the density the rock.
3e. Take 1000 times 13.2g/cm3 (density of rock) to get the density of the rock in k/m3.
3f. I've learnt that the density of a rock from space is same as the density in earth.
4f.The density of part Q remains at 7750kg/m3 , remaining the same , density is calculated from m/v.
4d.Part P floats on mercury , therefore the density of part P is less than that of mercury.
5c.Orange dye is amixture as it is made up of more than 2 substances that are not chemically combined together.
5d.The original drop of dye would dissolve into the water and separation of its component cannot happen if it had been placed below the water level.
6c. Red Cabbage can be used as a natural indicator for acids and alkalis.