Yes, cutting of cardboard is Reversible change as no new substance is formed.If you stick the small pieces of Card Board together,you will get back the original Cardboard.

The depth of sowing crops varies from shallow (2-3 cm) to deep (10-12 cm) depending on the soil type and moisture condition. Usually, the most favourable depth of sowing crops is 3-5 cm.Deeper sowing is advantageous in sandy soils while shallow sowing is beneficial in heavy soils. Generally, seeds should ... Read More

Given: $\frac{-3}{8} -(\frac{-6}{20})$ To do: Solve the given expression. Solution:   $\frac{-3}{8} -(\frac{-6}{20})$ [Open the bracket] = $\frac{-3}{8} +\frac{6}{20}$ LCM of 20 and 8 is 40=$\frac{-3\times5+6\times2}{40}$ =$\frac{-15+12}{40}$ =$\frac{3}{40}$ Therefore, the solution is $\frac{3}{40}$

Given:Class teacher gave$150$ tickets to Sunil.So he could sell 60% of them.  To do: How many tickets did Sunil sell Solution: We need to find $60% of 150$ Percentage means “for every $100$” or "out of $100$." The (%) symbol as a ... Read More

To Do: Find the value of  32% of 40 Km Solution: So, 32% of 40 km = $\frac{32\times40}{100}$ =$\frac{64}{5}$Therefore, the value is $12.8$

Cross multiplication:In cross-multiplication, we multiply the numerator of the first fraction with the denominator of the second fraction and the numerator of the second fraction with the denominator of the first fraction .Suppose you want to add the fractions$\frac{1}{3}+\frac{2}{5}$. To get the numerator of the answer, cross-multiply. In other words, multiply ... Read More

Given :The given expression is $6 - 7 + 6$To do :We have to solve and find the value of given expression.Solution : $6-7+6$$=(6+6)-7$$=12-7$$=5$.The value of $6-7+6$ is 5.

We should not carry an umbrella during lightning or thunderstorms because the metal shaft of the umbrella might attract lightning and give a shock to the person holding it and the person may die.

Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field. There are two types of electric charges: positive and negative (commonly carried by protons and electrons respectively). Like charges repel each other and unlike charges attract each other.

 A neutralization reaction is when an acid and a base react to form water and salt.It involves the combination of H+ ions and OH- ions to generate water. When a solution is neutralized, it means that salts are formed from equal weights of acid and base.Acid + Base --> Salt + ... Read More