Natural Resources — Science STD 9 — Question

The seat belts are provided in the cars so that if the car stops suddenly due to an emergency braking, the persons sitting on the front seats are not thrown forward violently and saved from getting injured. Can you guess the law due to which a person falls in forward direction on the sudden stopping of the car?

Antibiotics do not work against viral infections because:

Which of the following path is assumed for the electron in the theory of Rutherford:

The acceleration due to gravity is zero at ______.

Take a clean glass slide and put few drops of water on it. Now place a complete Rheo leaf on water droplets and examine the cells of leaf under the high power of compound microscope. Put a few drops of concentrated salt/sugar solution on the mounted Rheo leaf on the glass slide. Wait for few minutes and again observe the leaf under the high power of microscope.
What will be your observation after few minutes?

Which of the following best describes the methods to separate a mixture of two miscible liquids and two immiscible liquids​ respectively:

The particles of the colloidal solution are

Swollen feets and ankle can be naturally cured by dipping them in salt water. Suggest the mechanism involved in this treatment.