Structure of the Atom — Science STD 9 — Question

Natural system of classification employs:

1. Compleify of cell structure.
2. Complexity of body structure.
3. Organisation.
4. All the above.

Which of the following have been artificially selected?

1. Cabbage
2. Cauliflower
3. Broccoli
4. All of these.

Which of the following is called as the brain of the cell?

As a body moves from the equator to the poles, the value of g experienced by the body:

A student draws a distance-time graph for a moving scooter and finds that a section of the graph is a horizontal line parallel to the time axis. Which of the following conclusion is correct about this section of the graph?

1. The scooter has uniform speed in this section.
2. The distance travelled by scooter is the maximum in this section.
3. The distance travelled by the scooter is the minimum in this section.
4. The distance travelled by the scooter is zero in this section.

The number of lenses in compound light microscope is:

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

Increase in momentum by 20% will increase the K.E. by:

The energy possessed by wind is:

The excretory organs of Annelida are:

1. Nephridia.
2. Statocysts.
3. Archeocytes.
4. None of the above.

The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?

Option: