CHOITHRAM SCHOOL MANIKBAGH INDORE CLASS IX Session: 2014-15 Subject: Science
CHOITHRAM SCHOOL MANIKBAGH INDORE
CLASS IX Session: 2014-15
Allotment Date: 14/11/2014
Assignment No: III
Submission Date: 20/ 11/2014
Define law of constant proportion?
Why is the needle end of an injection sharp?
How does antibiotic works in bacterial infection?
SHORT ANSWER TYPE I
Name two bacterial diseases that are sexually transmitted?
A solid object of mass 100 g and volume 200 cm3 is put in water. Will the
Relative density of silver is 10.5.Find the density of silver.
Calculate number of moles and number of atoms of each type in 4.9 g of
SHORT ANSWER TYPE II
1. What is immunization?
2. Why is making antiviral medicines is harder than making anti bacterial
1. If someone is suffering from a cold and cough in the class. It is likely that
the children sitting around will be exposed to the infection. But all of them
do not actually suffer from the disease. Why not?
2.What is the basic difference between Sign and Symptom?
Recently your school organized health checkup camp.Eminent doctors
visited and gave tips on extrinsic and intrinsic causes of diseases as well as
types of diseases. Later, students were examined by doctors.Next days
teacher asked the following questions:
(a) List atleast three conditions essential for good health?
(b) Mention two ways to keep our surroundings clean?
(c) Name any disease which will occur due to lack of sanitation?
LONG ANSWER TYPE
1)If the number of molecule in a given sample of sulphur di oxide is 3.011x
10 23,calculate the following
a) Number of moles in the given sample.
b) Mass of SO2 in the given sample
c)Number of oxygen atom in the given sample
2) Write chemical formula of calcium bi carbonate and ammonium sulphate.
3) What do you mean by polyatomic ions? Give examples
(i) What does this statement mean: ‘relative density of gold is 19.3?
(ii) A body weighs W1 in air and W2 in water. How relative density can be
(iii) Does relative density and density represent the same physical quantity?
(iv) An oil of relative density 1.1 and volume 2 litres is poured on water.
What is the mass of oil?