PHYSICS CH 1 Measurement — Science STD 9 — Question

A train travelling at a speed of 90kmph. Brakes are applied so as to produce a uniform acceleration of -0.5 ms-2. Find how far the train will go before it is brought to rest?

Describe the classification of bases based on their acidity.

Some human diseases are transmitted only when the blood of a patient comes in close contact with the blood of a healthy person. In one such disease, there is a progressive decrease in WBC of the patient.

1. Name the disease and its causative agent.
2. Name the type of WBC affected during infection.
3. How does the blood of a patient come in contact with the blood of a healthy patient?
4. Suggest three methods that help in preventing such infection.

Higher Order Thinking Skills.

When a ray of light passes from air into glass, is the angle of refraction greater than or less than the angle of incidence?

Write the rules that are followed in writing the symbols of units in SI system.

to match:

Group in the modern periodic table	Families
a) 1	?
b) ?	Transition metals
c) ?	Boron family
d) 15	?
e) 17	?

Explain the structure of Honey Bee Comb.

Mention the drawbacks of Nanomaterials in chemistry.

Explain the types of dyes based on their method of application.