Advertisements
Advertisements
प्रश्न
While lighting a candle, Paheli observed the following changes.
- Wax was melting
- Candle was burning
- Size of the candle was reducing
- Melted wax was getting solidified.
Of the above, the changes that can be reversed are
विकल्प
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)
Advertisements
उत्तर
(i) and (iv)
Explanation:
Solid wax can be melted and melted wax gets solidifies again. Hence melting of wax and its solidification are reversible changes.
APPEARS IN
संबंधित प्रश्न
Drying of wet clothes in air is an example of
Formation of curd from milk is
Magnet attracts iron needle.This is ______ change.
When a candle is lit the following changes are observed.
- Wax melts.
- Candle keeps burning.
- The size of the candle decreases.
- The molten wax solidifies
- Which of the changes can be reversed? Justify your answer
A drawing sheet changes when you draw a picture on it. Can you reverse this change?
When ‘Touch me not’ plant is touched by us, ______ changes occur.
Look at the figure which shows three situations.
Which of these shows a reversible change and why?
Which of the following changes cannot be reversed?
- Blowing of a balloon
- Folding paper to make a toy aeroplane
- Rolling a ball of dough to make roti
- Baking cake in an oven
- Drying a wet cloth
- Making biogas from cow dung
- Burning of a candle
Paheli mixed flour and water and
- made a dough,
- rolled the dough to make a chapati,
- baked the chapati on a pan,
- dried the chapati and ground it in a grinder to make powder.
Identify the changes (i) to (iv) as the changes that can be reversed or that cannot be reversed.
Choose the odd one out. Give reason for your choice.
