CLASS 7
SUBJECT: SCIENCE
Date of submission 31/05/19
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Date of submission 17/06/18
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Date of submission 11/06/18
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Date of submission 31/05/18
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Date of submission 11/11/17
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Date of submission 06/11/17
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Date of submission 06/10/17
Exercises
Question 1:
Fill the missing word in the blank spaces in the following statements:
(a) Wind is __________ air.
(b) Winds are generated due to __________ heating on the earth.
(c) Near the earth’s surface __________ air rises up whereas ___________ air comes down.
(d) Air moves from a region of __________ pressure to a region of __________ pressure.
Question 2:
Suggest two methods to find out wind direction at a given place.
Question 3:
State two experiences that made you think that air exerts pressure (other than those given in the text).
Question 4:
Explain why holes are made in hanging banners and hoardings.
Question 5:
How will you help your neighbours in case cyclone approaches your village/town?
Question 6:
What planning is required in advance to deal with the situation created by a cyclone?
Question 7:
Which one of the following place is unlikely to be affected by a cyclone?
(i) Chennai (ii) Mangaluru (Mangalore)
(iii) Amritsar (iv) Puri
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Date of submission:25.08.2017
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1. A simple pendulum takes 40 s to complete 20 oscillations. Calculate the time period of the pendulum.
2. Does the time period of the simple pendulum depend on mass of the bob?
3. What type of motion a simple pendulum execute?
4. If a bus travels at 40 km/hr . Then what is the time taken to cover 200 km.
Date of submission:28.07.2017
I. Fill in the blanks:
1) Red eyed frog has __________ pads on its
feet.
2) Polar bear has
a layer of _______ under its skin to keep it warm.
3) The bird
Toucan has a ___________ beak to reach fruits on branches.
4) Tropical
rainforests are found in ________ and _____ in India.
5) Reindeers are
found in _______ region.
II.Differentiate between:
1) Climate and
weather
2) Animals of
Polar and Desert region.
III. List the
adaptations of:
1) Red eyed tree
frog
2) Lion tailed
Macaque
3) Polar bear
4) Toucan
Date of submission:18.07.2017
1) Acids
are--------------------in taste.
2) Bases
are------------------------to touch.
3) ____is used as
window cleaner.
4) ____ is
used as an antacid.
Match the following
Column A
|
Column B
|
|
1
|
Litmus
|
Formic acid
|
2
|
Common salt
|
Natural indicator
|
3
|
Ant bite
|
Hydrochloric acid
|
4
|
Stomach
|
Neutral
|
III. Mark True or False:
1) Tamarind
contains base.
2) Acids are bitter
in taste.
3) Vinegar contains
acetic acid
4) Toothpaste is basic
Date of submission:03.07.2017
1. What
is land and sea breeze.
2. What
type of clothes are suitable in summer/winter
3. Why
is two thin blankets keep us warmer than one thick blanket?
4. List
out 5 conductors and insulators?
Date of submission:23.06.2017
1. Name some animals other than sheep which yild wool.
2. Shearing does not hurt the sheep. Why?
3. What is shearing?
4. Why shearing is done in summer
5. What is the term used for soft hair present on the body of a sheep or yak?
6. Name the region in India where angora goats are found
7. Explain, how a cocoon is formed?
MULTIPLE CHOICE QUESTIONS
1. Given below from (i) to (iv) are some food items.
(i) Boiled and mashed potato
(ii) Glucose solution
(iii) A slice of bread
(iv) Mustard oil
Which of the above will give blue-black colour when tested
with iodine?
(a) (i) and (ii) (b) (i) and (iii)
(c) (ii) and (iii) (d) (iii) and (iv)
2. Which of the following pair of teeth differ in structure but are
similar in function?
(a) canines and incisors.
(b) molars and premolars.
(c) incisors and molars.
(d) premolars and canines.
3. Read carefully the terms given below. Which of the following
set is the correct combination of organs that do not carry out
any digestive functions?
(a) Oesophagus, Large Intestine, Rectum
(b) Buccal cavity, Oesophagus, Rectum
(c) Buccal cavity, Oesophagus, Large Intestine
(d) Small Intestine, Large Intestine, Rectum
4. The swallowed food moves downwards in the alimentary canal
because of
(a) force provided by the muscular tongue.
(b) the flow of water taken with the food.
(c) gravitational pull.
(d) the contraction of muscles in the wall of food pipe.
5. The acid present in the stomach
(a) kills the harmful bacteria that may enter along with the
food.
(b) protects the stomach lining from harmful substances.
(c) digests starch into simpler sugars.
(d) makes the medium alkaline.
6. The finger-like outgrowths of Amoeba helps to ingest food.
However, the finger-like outgrowths of human intestine helps
to
(a) digest the fatty food substances.
(b) make the food soluble.
(c) absorb the digested food.
(d) absorb the undigested food.
7. Read the following statements with reference to the villi of small
intestine.
(i) They have very thin walls.
(ii) They have a network of thin and small blood vessels
close to the surface.
(iii) They have small pores through which food can easily
pass.
(iv) They are finger-like projections.
Identify those statements which enable the villi to absorb
digested food.
(a) (i), (ii) and (iv) (b) (ii), (iii) and (iv)
(c) (iii) and (iv) (d) (i) and (iv)
8. The false feet of Amoeba are used for
(a) movement only.
(b) capture of food only.
(c) capture of food and movement.
(d) exchange of gases only.
9. The enzymes present in the saliva convert
(a) fats into fatty acids and glycerol.
(b) starch into simple sugars.
(c) proteins into amino acids.
(d) complex sugars into simple sugars.
Date of submission: 03.06.2017
- Tiny pores on the surface of leaves are
called _______________.
- Photo means _______________and synthesis
means _____________.
- ______________ and _____________ are the
two raw materials needed for photosynthesis.
- Carbon dioxide is taken in from the
_________by the leaves for photosynthesis
Give scientific reasons-
i) Photosynthesis cannot take place in night.
ii)
Algae are green in colour.
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1.Collect pictures, news paper articles, information from internet on
- Nature conservation,
- Energy conservation and
- Water conservation
2. Try to implement the methods for conservation(nature , energy, water) in your household, school neighborhood. Based on this write an essay on the steps you have taken for the conservation of environment during your summer vacation.
3. Plant trees. (Jackfriut tree, mango tree etc...) in your locality.
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