DIWAKAR MODEL SCHOOL
HOLIDAY HOMEWORK
CLASS - XI ‘A’
SUB: - CHEMISTRY
1. Study the table given below carefully then answer the following question only by
filling codes (i .e A to G)
Solution
A
B
C
D
E
F
G
pH
2
9
3
1o
6
7
5
(a) What is the pH of pure water?
(b) Which solution is most acidic?
(c) Which solution is most alkaline?
(d) Which solution is nearest to neutral?
(e) Which two solutions, when mixed must produce an alkaline solution?
(f) Which two solutions, when mixed must produce an acidic solution?
(g) Out of these solutions mention two combinations which produce salt?
2. Take some weak acids like lemon juice, vinegar or soft drink & weak base like
detergents, baking soda from your daily life & show the effect of both acids & bases
on indicator turmeric. Record your observations.
3. Prepare a project report on topic “Use of metals & non metals” in ancient time , on
industrial scale & on domestic scale use your daily life examples creatively use
pictures , diagrams or illustrations to enrich you project report.
4. Given below is a form of periodic table in which some elements are represented
by some letter. Carefully observe the table & answer the questions that follow.
1
2
3 4
5
6
7
8
9
10 11 12
13 14 15 16 17 18
B
G
K
E
C
P
D
H
(a) Elements which can accept as well as denote one electron.
(b) Metal having valency ( +3)
(c) A lanthanide
(d) An actinide
(e) An alkaline earth, metal
(f) A semi metal
(g) An alkali metal
(h) A reactive gas which has 0 valency
(i) A metal with atomic number 27.
A
SUB: - BIOLOGY
Topic Human brain
1. Here is an activity to find out which side of your brain is more active. Find out
which side right or left, you use more, pair up with your friend and try this
experiment. Ask your friend to do the following task (given in the table) and
then you tick in the appropriate columns. Now repeat this activity vice- versa.
Name of your friend:
Task
Right
Left
Write your name
Right hand
Left hand
Jump on a mat with one
foot
Right hand
Left hand
Use scissors to cut paper
Right hand
Left hand
Look through a pipe/ tube
Right eye
Left eye
Kick a ball
Right foot
Left foot
Cup your ear to listen to a
whisper
Right ear
Left ear
Listen through a wall
Right ear
Left ear
Which side of the brain your friend uses the most?
2. Prepare a pamphlet on AIDS to create awareness among people & include
following points to their pamphlet
. Mode of transmission
. Symptoms
. Treatment
. Preventive measures
3. Differentiate between the two mode of reproduction asexual & sexual using
the following parameters.
Criteria
Asexual
Sexual
Relative complexity of the
organism (size)
Number of parents
involved
Reproduction mechanism
Genetic variation in
offspring
4. Make an investigatory project report on any one of the following.
. Bio - technology
. Cardio vascular disease
. Twins and digestive problem
SUB: - PHYSICS
1. Prepare a project file on any one physicists. Explaining his / her contribution/
discovery in the field of physics. (Minimum page 30)
2. Prepare a working model on any relevant topic of physics.
SUB: - PHYSICAL EDUCATION
1. Make a project file of latest records of games at Indian, world & Olympic level.
(Badminton, judo, cricket, swimming, hockey)
2. List the benefits of yoga asana. (5assans). Prepare an assignment.
SUB: - MATHS
1. In a circle of diameter 40cm, length of a chord is 20cm. Find the length of
mirror arc of the chord.
2. A wheel makes 360 revolutions in one minute. Through how many radians
does it turn in one second?
3. Write a project report about 150 words on TRIGRONOMETRY.
OR
Prepare a P.P.T on any one of them (20slides)
i. Aryabhatt First
ii. Brahamgupt
iii. S. Ramanujan
iv. Shridhar
4. Prove that cot 4x ( sin 5x + sin 3x) = cot x ( sin 5x – sin 3 x)
5. Prove that sin(n+1) x sin(n+2) + cos (n+1) x cos (n+1)x=cos
6. Find sin x/2, cosx/2 and tan x/2 in quadrant II, if sin x =1/4.
7. Prove that sin 3x+sin 2x- sinx= 4sinx cosx/2 cos3x/2.
SUB: - ENGLISH
1. There has been mushrooming of coaching centres in all Metropoliton cities and
it is growing day by day. Are students not properly taught in schools or the reasons
are something different. Discuss on the subject and note down the conclusion for the
same.
2. ‘Road Rage’ is something which can happen anytime, anywhere. Are we losing
our patience day by day? What we should do in order to avoid ‘Road Rage’?
3. As a part of cleanliness campaign i.e. Swach Bharat Abhiyan, write a report how
this campaign was very seriously taken by your school and what steps you had taken
to create awareness among the people regarding this mission.
4. As a student of class XI, you are required to find out the new courses available in
the market, eligibility criteria, list of institutes conducting the courses, percentage
required etc.