Structure of the Atom — Science STD 9 — Question

Rutherford’s alpha particle scattering experiment led to the discovery of:

Which of the following are compounds?

1. CO
2. No
3. NO
4. Co

1. (i) and (ii)
2. (ii) and (iii)
3. (i) and (iii)
4. (ii) and (iv)

All types of energy that exist in the nature can be categorized as either kinetic or potential. Choose correct statement regarding the validity of above sentence:

Who proposed the concept of evolution?

1. Aristoltle.
2. Theophrastus.
3. Darwin.
4. Linnaeus.

Select the odd one out:

Which of the following is true about distance and time.

Which scientist was the first to observe red blood cells in humans and other animals?

What is the use of a tuning fork?

A 5 percent sugar solution means that:

Soil erosion can be prevented by:

1. Terrace farming.
2. Intensive cropping.
3. Deforestation.
4. Both (a) and (b).