Practice Paper – TERM II (2021 – 2022)
Class – IX
Science (086)
Time: 2 hours Maximum Marks: 40
General Instructions:
i) All questions are compulsory.
ii) The question paper has three sections and 15 questions. All questions are compulsory.
iii) Section–A has 7 questions of 2 marks each;
iv) Section–B has 6 questions of 3 marks each; and
v) Section–C has 2 case based questions of 4 marks each.
vi) Internal choices have been provided in some questions. A student has to attempt only one of the alternatives in such questions.
SECTION – A
Q. No.
1. A boy is suffering from common cold.
a. Which type of disease is this, acute or chronic?
Acute
b. Name two chronic diseases
diabetes, tuberculosis etc.
2. How does value of ‘g’ varies at poles and equator of the planet earth.
Earth is not a sphere it is ellipsoid. Value of ‘g’ is comparative more at poles and less on equator of the planet earth.
3. a. If your weight is 66N on the earth surface. What will be your weight on the moon?
11N (calculation is required)
b. Will your mass increase or decrease on moon surface?
mass of an object remains constant irrespective of place, it will not change
OR
a. A ball freely falls off from the terrace of a building and drops to the ground in 2s. What is its speed on striking the ground? (g=10m/s2)
v = u + at; 20m/s
b. What is the height of the building?
S = 1/2at2; 20m (correct calculation is required)
4. Personal hygiene is a necessary condition for good health. Write at least two more condition required for a good health?
Economic stability, public hygiene etc. (any other correct response)
OR
How does a doctor diagnoses the disease in a diseased person?
doctor diagnoses the disease in a diseased person by observing disease sign and symptoms (elaboration is required)
5. Name two subatomic particles. Also write the respective charge on these.
Proton, neutron, electron. (any two with correct charge)
6. The mass number of Fluorine is 19 and its atomic number is 9. Write the symbol of this element. How many electrons and neutrons are present in its atom.
F ; e = 9 ;n = 10
7. Two element having atomic no.6 and 17 are represented by X and Y respectively. What will be the valency of these two elements?
X = 2, 4; valency = 4; y = 2, 8, 7; valency = 1
SECTION B
8. a. An arrow moves forward when released from a stretched bow. Explain the transformation of energy in the process.
muscular energy- potential energy- kinetic energy.
b. A girl of 40 kg climbs up on her house terrace which is 15 feet above the ground. Calculate the amount of potential energy she gains. (1foot=0.3m)
15 foot = 4.5m p = mgh; p = 40 x 10 x 4.5m = 1800J
OR
What is the work to be done to increase the velocity of a bus from 36km/h to 72km/h if the mass of the bus is 1000kg?
36km/h = 10m/s; 72km/h=20m/s
Initial KE = 1/2mv2 = 50,000 J ; final KE = 1/2mv2 = 200,000 J
Work done = change in KE
=2,00,000 – 50,000 = 1,50,000J
9. a. State Universal law of gravitation along with its equation. Also write two of its importance.
Every particle attracts every other particle in the universe with a force that is directly proportional to the product of the masses and inversely proportional to the square of the distance between them.
The importance of universal law of gravitation is that it explains the motion of planets around the sun; the motion of moon around the earth; and the motion of artificial satellites around the earth. It also explains the phenomena of rainfall, snowfall, and flow of water in rivers on the earth.
b. What does ’G ’and ‘g’ stand for with respect to gravitation?
’G ’ universal gravitation constant and ‘g’ stands for acceleration due to gravity.
10. a. Write the chemical formula of Aluminium hydroxide and Sodium chloride.
Aluminium hydroxide=Al(OH)3 and NaCl
b. Name the following compound:
i. Al2O3 – Aluminium oxide
ii. MgO – Magnesium oxide
11. a. During photosynthesis glucose (C6H12O6) and oxygen is formed. Calculate the molecular mass of glucose. (C=12u, H=1u, O=16u)
C6H12O6 = 6 X 12u + 12 x 1 + 6 x 16 = 180u
b. How many atoms are present in 12g of C-12?
6.022X1023 (I mole) atom in 12g of C-12
12. Define cation and anion. When sodium chloride dissolved in water it forms sodium and chloride ions. Categories them into cation and anion. Also write the symbols of these ions.
Ion are charge particles. Any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations; negatively charged ions, anions. cation =Na+ and anion=Cl—.
13. a. What are isotopes? Write two application of isotopes.
element having same atomic number but different mass number. correct application of isotopes.
b. Identify the atom whose structure is shown in given diagram. Also write its electronic configuration.
Mg, 2,8,2
SECTION C
This section has 02 case-based questions (14 and 15). Each case is followed by 03 sub-questions (a, b and c). Parts a and b are compulsory. However, an internal choice has been provided in part c.
14. Raju observed that in his house following devices are used every day.
i. 4 tubelights of 40 W for 8 hours.
ii. A TV of 120 W for 6 hours.
iii. water pump motor of 1000w for 1 hour.
Answer the following questions.
a. Write the energy transformation that takes place when tubelight is switched is on.
electrical energy – light energy.
b. Suggest two measures to save electricity.
Any two measures to save electricity.
c. What will be his house electricity bill for the month of March, if given rate of electricity consumed is Rs 3.00 per unit.
Tubelight 40W =.04kW; water pump=120W=.120kW
Electricity consume by tubelight per day =4x.04kwx8h = 1.28kWh
Electricity consume by TV per day =1x.120kwx6h = 0.72kWh
Electricity consume by water pump per day =1kwx1h = 1kWh
Total electricity consumed per day in the house=3kWh or 3 units
Total electricity consumed in the month of march=3kwh x31=93kWh or 93 units
Bill for the month or march @ 3.00Rs per unit will be=93unit x3=279 Rs.
OR
How much water per minute the above water pump can raise to a height of 10m?
P=1kW =1000W ;h=10m,g=10m/s2 ;t=1min =60s
P=w/t =mgh/t
Mass of water = (Pxt)/gh =600kg.
15. A dog bites a boy when he was disturbing him in a street. His father takes him to the doctor. Doctor prescribed 7 injections to him.
Answer the following questions.
a. Which disease can be caused by dog bite? This disease is caused by which infectious agent.
rabies. rabies is caused by a virus.
b. What are vectors? Name two vector borne diseases.
Vectors are living organisms that can transmit infectious pathogens between humans, or from animals to humans. Rabies, dengue, chicken guinea etc.
c. The injections prescribed by the doctor was the vaccine. How these vaccines will save the life of the boy?
Vaccine is a biological substance designed to protect humans from infections caused by bacteria and viruses. They help the individual to build his immunity against specific diseases. These vaccines will help the body to produce the antibody which fight against the diseases causing pathogen and save the life of the individual.
OR
‘Prevention of diseases is better than its cure’. Justify this statement.
As the disease affects the body, the functioning of body organs can be a concern, and medication needs which can cause side effects including allergies. There are certain diseases that cannot be treated so the prevention is better than cure.