SCIENCE
Grade :VIII
HOLIDAY HOMEWORK- SCIENCE
PHYSICS
1. Friction plays an important role in our daily life substantiate your answer?
2. Wave B will create a
a)
b)
c)
d)
sound than wave A.
louder
soft
lower pitch
higher pitch
3. How is gravity different from gravitational force?
4. An elephant weighing 50,000 Newton stands on one foot of area 1000cm2 . What is the Pressure
exerted on the ground?
5. Explain by some experiment that sound waves require medium for their propagation.
6. The wavelength shown in the diagram is
.
a)
b)
c)
d)
2 meters
4 meters
8 meters
12 meters
7. State the type of force acting in the following conditions-
(a)
(b)
(d)
(e)
(c)
(f)
8. Why are the voices of men, women and children different?
9. State the various measures which can be taken to control {or reduce} noise pollution in our
surroundings.
10. What you mean by drag force? Explain why objects moving in fluids must have special shape?
11. Write the correct words by putting letters in correct sequence
(i)
car : fuel :: body : ?
(ii)
weight : newton :: pressure : ?
Chemistry
Name the following
1.
Materials having both the properties of metals and non metals .
2.
A non metal which is a good conductor of electricity.
3.
A reaction in which highly reactive metal displaces a least reactive metal from
its salt solution.
4.
The process by which artificial fibres are made from simple molecules
5.
The fibre which is known as regenerated fibre.
What happens when( write the chemical equation)
1. Dilute sulphuric acid poured on copper plate.
2.Iron nails dipped in copper sulphate solution.
3. Sodium metal dropped in water.
4. Iron articles exposed to moist air.
5. Magnesium burnt in air
Answer the following
1.
Saloni took a piece of burning charcoal and collected the gas evolved in a test
tube
i) How she will find the nature of gas?
ii) Write down the word equation for all the reaction involved in this process
2.
What are noble metals ? Write two examples.
3.
Explain why the following are made from thermo setting plastics
a) Sauce pan handles
b) Electric plugs/switches/switch board
4.
Why are bells made up of metals?
5.
Which of the following metal displaces the other two from its solution?
Zinc,Iron,Copper.
6.
Why only silver,gold and platinum metals are using for making jewellery?
7.
Draw the two types of arrangement of monomer units in plastics.
8.
Bucket made of plastic doesnot rust like a bucket made of iron . Why?
9.
Terrycot is made by mixing two types of fibres.write the names of the fibres.
10.
Why it is not advisable to burn synthetic fibres and plastics
11.
Complete the table
Synthetic fibre
Monomer unit
Two uses
Nylon
Polyester
PVC
PET
Acrylic
12.
Imagine you have been asked by the government to develop a campaign to
encourage people to stop using plastic bags,make a slogan and design a poster for
your campaign.
13.
How will you apply the 3Rs (Reduce,Reuse and Recycle) in your daily life?
SUBJECT – BIOLOGY.
QI. Answer the following questions.
1. Give reasons for the following
a) Fresh milk is boiled before consumption while processed milk stored in packet
can be consumed without boiling
b) Raw vegetables and fruits are kept in refrigerators whereas jams and pickles
can be kept outside.
c) Farmers prefer to grow beans and peas in nitrogen deficient soils.
2. Observe the figure and answer the questions that follows.
a) Write the name of the disease.
b) Name the causative agent of this disease?
c) How does the disease spread from one plant to another
3. Explain circumstances leading to acid rain. How does acid rain affect us?
4. List various measures that would help us to avoid water from getting polluted .
5. Draw a poster on an A4 size sheet to create awareness about water conservation.
6. Label the parts in the given diagram below.
7. What are microorganisms ? Write a short note on useful microorganisms you have
studied in the chapter.
8. Explain nitrogen cycle with the help of a diagrammatic representation.
9. Find out various discoverers with their discoveries in the field of microbiology
( study of microorganisms ).
10. Read the following statements and write the appropriate term against each
statement.
a) I control the functions of a cell. Who am I?
b) I am the policeman .I do not allow anything and everything to get in and out of the
cell. Who am I?
c) I transfer character from parents to offspring. Who am I?