Which numbers should be interchanged to make the given

Which organ in the human body is primarily responsible for filtering blood?

Which of the following are environment-friendly practices ?

When a detergent is added to pure water, its surface tension –

Match the Column I with Column II and select the correct answer using the codes given below:

Which of the following is/are true about ‘Villi’?

I. They are present in the walls of the small intestine.

What do we call sound waves with frequencies below 20 Hz?

Kindly Study the following questions carefully and choose the right answer.

In Young’s double-slit experiment, dark fringes on the screen occur where:

Which gas is most abundant in Earth's atmosphere?

The phenomenon due to which the sky appears blue is