Anaerobic bacteria digest animal wastes and produce biogas (change X ). The biogas is burnt as fuel
(change Y). Choose the correct statement.
AChange X is a chemical change and Y is a physical change.
BChange Y is a chemical change and X is a physical change.
CBoth X and Y are chemical changes.
DBoth X and Y are physical changes.
Vibhuti took four different types of
container and poured water in them as shown in the picture. Arrange the containers in order of the amount of water contained in them and select the correct option.
AW = Y > X = Z
BW = Y < X = Z
CW > Y = X > Z
DW = X < Y = Z
ans B is correct
Ram and Shyam have performed the experiment to separate sugar from water, as shown in the figures.
Which of the following statements are incorrect?
1. Method 1 is slower than method 2.
2. Method 2 leads to the decomposition of sugar to carbon.
3. Method 1 is more appropriate than method 2.
4. Method 2 is slow but pure sugar is obtained without getting decomposed.
B1, 2, 3
Very good and tricky question. Will be waiting for questions like this.
Refer to the given pie charts based on waste segregation methods X and Y and select the correct option.
A Method Y is more environment conscious because polythene bags are disposed with kitchen waste.
B Method X is more environment conscious because polythene bags are disposed off separately.
C Method Y is more environment conscious because newspapers are not generated.
D None of these