Force and Laws of Motion — Science STD 9 — Question

Cell wall of plant cells is chiefly composed of:

1. Hemicellulose.
2. Celluolse.
3. Phospholipids.
4. Proteins.

The atomic number of an element X is 8 and that of element Y is 4. Both these elements can exhibit a valency of:

1. 1
2. 2
3. 3
4. 4

The amplitude of the vibration of an ordinary conversation between two persons is approximately:

Which of the following effect cannot be produced by an unbalanced force acting on a body?

1. Change in speed of the body.
2. Change in shape of the body.
3. Change in direction of motion of the body.
4. Change in state of rest of the body.

Name the property of matter due to which a body continues to be in its state of rest or uniform motion unless an external force acts on it:

Starting from rest objects 1 falls freely for 4 seconds and object 2 falls freely for 8 seconds.Compared to object 1, object 2 falls

The most common type of ground tissue is:

1. Epidermis.
2. Collenchymas.
3. Sclerenchyma.
4. Parenchyma.

Name the sounds of the frequencies given below 10Hz.

Which of the following is true about distance and time.

Ligaments and tendons are formed of: