Question

In which type of change a new substance is formed? *
1 point
In neither of these
In chemical change
In physical change
In both (a) and (b)
Which among the following is a physical, irreversible change? *
1 point
Cutting a log of wood in small pieces
Ripening of fruit
Burning of wood
Cooking of food
Which of the following is an undesirable change? *
1 point
Bursting of a fire cracker
Germination of seed
Coal formation from buried trees
All of these
Rusting can be prevented by using which of the below listed? *
1 point
Crystallization
Sedimentation
Galvanisation
None of these
Name the process by which pure substances is obtained from its saturated solution, on cooling? *
1 point
By crystallization
By chromatography
By peptization
By all these methods
Digestion of food is a *
1 point
physical change
reversible change
undesirable change
chemical, irreversible change
Expansion due to heating is used to *
1 point
fix wooden handles on the tools
fix metal rim on wooden wheel
both of the above
none of the above
Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a: *
1 point
physical change that can be reversed
chemical change that can be reversed
physical change that cannot be reversed
chemical change that cannot be reversed
Manmade activities cause both desirable and undesirable changes like
1 point
urbanisation and deforestation
building malls and cutting trees
making dams for hydropower and destroying flora and fauna
all of above
Earth quakes and floods are examples of *
1 point
physical change
undesirable change
non periodic change
all of above

Answer 1

Answer:

In chemical change

Cutting a log of wood in small pieces(physical change)

Bursting of a fire cracker

Galvanisation

Crystallization

chemical, irreversible change

fix metal rim on wooden wheel

physical change that can be reversed.

all of above

non periodic change

Explanation:

PURA Q PAPER HI DE DO

HAD HO GAYI

KUDH BHI KUCH KARLO

Answer 2

Try to do on your own totally dependent on this app