Work And Energy — Science STD 9 — Question

Positive charge in an atom is:

Cell inclusions are:

1. Non-living materials present in the cytoplasm.
2. Another name of cell organelles.
3. Cytoskeletal framework of cell.
4. Combined name for cell wall and plasma membrane.

Which of the following are covered by a single membrane?

Striated muscles:

Which of the following has a direct effect on the kinetic energy of particles:

What is force in physics?

Organisms such as lichens are very sensitive to the level of ___________ in the atmosphere.

1. Carbon dioxide.
2. Sulphur dioxide.
3. Carbon monoxide.
4. Methane.

A disused railway line has a length of 300m. A man puts his ear against one end of the rail and another man hits the other end with a metal hammer. Sound travels at 5000m/ s in steel. The time it takes for the sound to travel along the rail is:

The persistence of sound in a hall is called:

Which of the following situations involves the Newton’s second law of motion?