Inside the Atom — Science STD 8 — Question

Which virus causes dengue and how does it spread?

Classify the following into solution, suspension and colloids:
Milk, sand in water, lemonade, smoke, oxygen in water.

Name the place and the first nuclear reactor in India.

State any one factor on which the buoyant force due to a liquid depends.

Arrange the following ¡n ascending order of size Bacteria, Fungi, Viruses, Algae.

Write a chemical equation for photosynthesis.

Activity Take a moist piece of bread or bhakri and keep it in a container with lid for 2-3 days. After 2-3 days a fine cotton thread like tuft is found growing on the surface of the bread. Prepare a temporary mount of few threads from this culture and observe it under the microscope.

What is a liquid (mercury or alcohol) thermometer?

Bacterial diseases.

Give one example in which frictional force is useful.