Atoms and Molecules — Science STD 9 — Question

A car accelerates uniformly from 18km/h to 36km/ h in 5s. The distance covered by the car will be:

Milk is an example of :

Four elements W, X, Y and Z contain 8, 11, 9 and 17 protons per atom respectively. The element which cannot form an anion is most likely to be:

In Rutherford's alpha-ray scattering experiment, a screen is used to detect the alpha particles which is coated by:

Out of the following, an example of matter which can be termed as fluid is:

Isotopes have same____but different____.

The speed of a moving object is determined to be 0.06m/s. This speed is equal to:

1. 2.16km/h
2. 1.08km/h
3. 0.216km/h
4. 0.0216km/h 

Sustainable agriculture involves:

1. Mixed farming.
2. Mixed cropping.
3. Crop rotation.
4. All of the above.

Plasma membrane is:

1. Permeable
2. Selective permeable
3. Semipermeable
4. Impermeable

The commercial unit of energy is: