HOLIDAY HOMEWORK 2015- 16
SUMMER VACATION TASK
SUB: Gen science
CLASS- VII
1. Go to a doctor or your nearest health centre. Observe the doctor taking temperature of
patients. Enquire :
 Why the doctor dips the thermometer in a liquid before use.
 Why the thermometer is kept under the tongue.
 Whether the body temperature can be measured by keeping the thermometer at some
place other than mouth.
 Whether the temperature of different parts of the body is the same or different.
You can add more questions which come to your mind. Record your observations in a note book.
CLASS- VIII
2. Go around in your village or any nearby village and do a survey on ‘ Damage of crops due to
nature’s fury’ by collecting information from ten different farmers. Record your observation
under following heads –no. of family members in the farmers’ family, the area of cultivated
land, name of crops sown, variety of crops, money invested in it, reason for damage, estimated
loss and Govt. aid received if any.
Also critically conclude why the farmers in some parts of our country are forced to commit
suicide. What is the Govt’s attitude toward these farmers in rendering a helping hand?
CLASS- IX
3.
Collect the records of effect of natural calamity on Rabi crops in your locality. Record your
observation under following heads-number of family members in the farmers’ family, the area
of cultivated land, name of crops sown, variety of crops, money invested in it, reason for
damage
CLASS-X
4. What is corrosion? How is it affecting our everyday life? What are the factors which effect
corrosion? State the ways and means to prevent corrosion
OR
5. What is rancidity and how is it affecting our everyday life? What are the factors which effect
rancidity? State the ways and means to prevent rancidity.
You can present your work in a creative manner in a single chart with pictures and diagrams
illustrating corrosion or rancidity covering - factors affecting them and ways to prevent it.
SUMMER HOLIDAY H.W.
Session 2015 – 2016
Name :
Subject : Chemistry
Class : IX
Name :
Subject : Chemistry
General instructions:
Class : IX
1. The holiday h.w.should be neatly done in the notebook.
2. The worksheet should be pasted in the notebook.
Answer the following questions:
It is a hot summer day;Priyanshi and Ali are wearing cotton and nylon clothes
respectively.Who do you think would be more comfortable and why?
Subject : ______________
Q1.
Q2.
You want to wear your favorite dress to a party,but the problem is that it is still
wet after a wash.What steps will you take to dry it faster?
Q3.
Osmosis is a special kind of diffusion in which the solvent molecules migrate from
solvent to the solution side through a semipermeable membrane.Classify the
following into osmosis/diffusion:
Swelling up of a raisin on keeping in water.
Spreading of virus on sneezing.
Earthworm dying on coming in contact with common salt.
Shrinking of grapes kept in thick sugar syrup.
Preserving pickles in salt.
Spreading of smell of cake being baked throughout the house.
Aquatic animals using oxygen dissolved in water during respiration.
a.)
b.)
c.)
d.)
e.)
f.)
g.)
Q4.
Alka was making tea in a kettle.Suddenly she felt intense heat from the puff of
steam gushing out of the spout of the kettle.She wondered whether the
temperature of the steam was higher than that of the water boiling in the
kettle.Comment.
Q5.
Why do we feel numbness , if we hold a few cubes of ice in our hand for more than
2 minutes?
Q6.
The boiling point of water is much higher than that of petroleum ether.In which of
the two the intermolecular forces are strong?
Q7.
Why is low pressure necessary for the formation of clouds in the rainy season ?
Q 8 . solve all the NCERT In Text and exercise problems of Matter in our surroundings.
QUESTIONS BASED ON PSA:
Q1.
Each of the following questions consists of two sets of figures. Figures A, B, C and
D constitute the Problem Set while figures 1, 2, 3, 4 and 5 constitute the Answer Set.
There is a definite relationship between figures A and B. Establish a similar relationship
between figures C and D by selecting a suitable figure from the Answer Set that would
replace the question mark (?) in fig. (D).
1. Select a suitable figure from the Answer Figures that would replace the question mark
(?).
Problem Figures:
Answer Figures:
(A)
(B)
(C)
(D)
(1)
(2)
(3)
A. 1
B.
C.
3
D. 4
E.
5
(4)
(5)
2
2.
Select a suitable figure from the Answer Figures that would replace the question mark (?).
Problem Figures:
Answer Figures:
(A)
(B)
(C)
(D)
(1)
(2)
(3)
A. 1
B.
C.
3
D. 4
E.
5
(4)
(5)
2
Q2.
In each of the following questions, two statements numbered I and II are given. There
may be cause and effect relationship between the two statements. These two statements
may be the effect of the same cause or independent causes. These statements may be
independent causes without having any relationship. Read both the statements in each
question and mark your answer as
(A) If statement I is the cause and statement II is its effect;
(B) If statement II is the cause and statement I is its effect;
(C) If both the statements I and II are independent causes;
(D) If both the statements I and II are effects of independent causes; and
(E) If both the statements I and II are effects of some common cause.
1.
Statements:
The prices of petrol and diesel in the domestic market have remained unchanged for
the past few months.
The crude oil prices in the international market have gone up substantially in the last
few months.
A. Statement I is the cause and statement II is its effect
B.
Statement II is the cause and statement I is its effect
C.
Both the statements I and II are independent causes
D. Both the statements I and II are effects of independent causes
E.
Both the statements I and II are effects of some common cause
Statements:
The government has recently fixed the fees for professional courses offered by the
2.
unaided institutions which are much lower than the fees charged last year.
The parents of the aspiring students launched a severe agitation last year protesting
against the high fees charged by the unaided institutions.
A. Statement I is the cause and statement II is its effect
B.
Statement II is the cause and statement I is its effect
C.
Both the statements I and II are independent causes
D. Both the statements I and II are effects of independent causes
E.
Both the statements I and II are effects of some common cause
Q3. In each of the following questions, select a figure from amongst the four alternatives,
which when placed in the blank space of figure (X) would complete the pattern.
1. Identify the figure that completes the pattern.
(X)
(1)
(2)
(3)
(4)
A. 1
B.
C.
D. 4
3
2
2. Identify the figure that completes the pattern.
(X)
(1)
(2)
(3)
(4)
A. 1
B.
C.
D. 4
3
2
Q4.
Four jars with different liquids are taken. An iron nail is dropped in each jar. The
time taken for the nail to sink to the bottom is noted down. In which jar will the nail
take the LEAST time to reach the bottom?
A. cough syrup
B. Honey
C. Water
D. oil
Q5.
Suraj had a bottle of soft drink. As soon as he opened the bottle, the liquid in the
bottle started bubbling and gas was released. Which of these can be concluded
about gases based on this observation?
A. some gases have weight.
B. Some gases are colourless.
C. Some gases float on some liquids.
D. Some gases are soluble in some liquids.
Q6.
Sweating is an important mechanism for keeping us cool in hot weather. Which of
the following correctly explains this?
A. when the sweat evaporates , it absorbs heat from the body and cools down.
B. The body loses heat by directly converting heat into sweat which comes out.
C. The sweat absorbs heat from the surrounding air,on evaporation making it cool.
D. Excess salts heat up the body,the body loses heat by removing these salts along
with water in the form of sweat.
Charita placed two pots of water on two identical stove burners at the same time
and lit both the burners. One pot (A) had 1 litre of water ,the other (B) had 3 litres
of water. At the point WHEN EACH OF THEM STARTED BUBBLING , she put a
laboratory thermometer into each pot and measured the temperature of water.
Answer Q7 and 8 based on the activity performed by Charita:
Q7.
Q8.
A
B
Which of the following did she observe?
A. the water in A started bubbling before B;temperatures in both were same.
B. the water in B started bubbling before the water in A , temperature in A was
lower.
C. the water in A started bubbling before the water in B; temperature in A was
lower.
D. water in A and B started bubbling at the same time;temperatures in both were
same.
When the water in both pots was boiling, Charita carefully removed them from the
flame and placed them both on a table. She then took two small identical metal
tumblers and poured equal amounts of water (at room temperature) into them. She
placed one in A and one in B. After a few minutes,she measured the temperature of
the water in the two tumblers with two thermometers. What did she observe?
(Assume that the pots do not lose any heat to the surroundings.)
A.
B.
C.
D.
the water in tumbler A was hotter.
water in tumbler B was hotter.
both the tumblers had water at the same temperature.
we have to know the thermometer readings to say which was hotter.
Q9.
Accuracy is defined as ,” the ability of a measurement to match the actual value of
the quantity being measured”. Assume that in reality it is 28.00C outside. One
thermometer A ,reads 28.20C and another B , reads 27.50C. Since the reading on
thermometer A is closer to the actual value, A is said to be more accurate than B.
Two thermometers (T1 and T2) are used to measure the temperature at which pure
water freezes. T1 reads 0.50C and T2 reads -0.80C. Which of the following is true?
A.
T1 is more accurate than T2.
B.
T2 is more accurate than T1.
C.
Both T1 and T2 are equally accurate.
D.
nothing can be said about accuracy with this data.
Q10. Nikhita dipped a string in water until it was fully wet. She then laid it along the top
of an ice cube. With a dropper , she put drops of warm water along the line of the
string on the ice. After a minute , she put the ice cube (and the string) back in the
freezer. In a little while, when she took the ice cube out of the freezer ,she found
that she was able to lift the ice cube with the string. How did this happen?
A.
The warm water melted the string and the ice around it. When both
froze,they were stuck together.
B.
the pressure of the warm water pushed the string inside the ice and when
she lifted the string, the ice cube came up along with it.
C.
the warm water increased the height of the ice-cube and it came over the
string. When she lifted the string,the ice-cube came with it.
D.
the string sank a little into the water when the warm water melted the ice
around it. When the water froze again, the string was inside the ice.