When you hold a pen and write on your notebook, what kind of force is exerted by you on the pen? By the pen on the notebook? By you on the notebook?

When Neils Bohr shook hand with Werner Heisenber, what kind of force they exerted?

John and Sara each bought the same type of pen and notebook in the school bookstore, which does not charge sales tax. John paid $5.55 for two pens and three notebooks, and Sara paid $3.50 for one pen and two notebook. How much does the school bookstore charge for one notebook?

In your locality, if a person is addicted to alcohol, what kind of behavioural changes do you observe in that person? Suggest measures to over come the problem.

What do you observe when Lead nitrate is heated.

When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe

If you hold your breath for the maximum possible time, what change do you observe in your breathing rhythm?

Out of 100 students, two sections of 40 and 60 are formed. If you and your friend are among the 100 students, what is the probability that(a) you both enter the same section?(b) you both enter the different sections?

The cost of a notebook is twice the cost of a pen. Write a linear equation in two variables to represent this statement. (Take the cost of a notebook to be x and that of a pen to be y).

Fill in the blanks by using the correct word/term given in the bracket and rewrite the complete sentence in your notebook: A farmer treats the soil of his field with lime when the soil has _____ nature. (basic/acidic)