First Terminal Diagnostic Test : 2020-21
Std -7
Date - 17-03-2021 Sub – Science Total marks - 80
Day - Wednesday Time – 3 Hours
Q 1:- A Identify the type of tooth indicated by the alphabet A, B and C by observing the figure given below. (03)
B Answer correctly. (03)
1) Which animal gives natural fibers?
2) Thin and expensive fiber which are popular as Kashmiri is obtained from which animal?
3) Which fiber are soft, shiny and flexible?
Q:- 2 Do as directed (05)
(1) Match the following.
A B
1. Digestion of starch A. Organic substances
2. Absorption of water B. Small intestine
3. Dead components in the soil C. Large intestine
4. A-level D. Habitat of ant, rat and other such living organisms
5. B-level E. mouth
F. Presence of more mineral elements
(2) Distinguish the following. (04)
1) Laboratory thermometer and Clinical thermometer. 2) Acid and Base.
Q:- 3 Classify the following into chemical changes and physical changes. (06)
Are not usually reversible.
One or more new objects are formed.
No sound or gas is produced.
The shape or dimension of the object changes.
New smell is not produced.
Heat or radiation is produce.
Chemical changes Physical changes
Q:- 4 Do as directed. (09)
(1) How would you check the presence of starch in leaves?
(2) Nehabhabhi takes two types of fiber, natural and synthetic. She does not know which one is natural fiber and which is synthetic fiber. Which activity you will suggest to identify the fibers?
(3) You are given three solutions A, B and C acid, base and neutral respectively. It is not possible to identify them just by looking how will you identify the type of solution.
Q:- 5 Do as directed. (10)
(1) Why there are holes on hoardings as well as clothes or plastic banners of advertisements hanged freely?
(2) Sandy soil is not suitable for cultivation. Give reason.
(3) What kind of clothes would you like to wear in the summer season? Why?
(4) How do elephants adapt to the equatorial rainforest region? Explain.
(5) A monkey can easily live on tree. Give reason.
Q:- 6 Do as directed.
(1) Blue coloured solution is given in the figure. Which solution is it? What causes the colour change in this solution. Explain. (03)
(2) A flag near the check post furls in the direction of sea. Is it midnight or afternoon? Why? (03)
(3) Describe the experiment showing the conduction of heat in solid substance with diagram. (04)
Q:- 7 Complete the equation (04)
1. Sunlight
Carbon dioxide + Water
___________ + ____________
Chlorophyll
2.
Acid + Base
_______________ + _____________
Q:- 8 While doing the experiment of percolation in your field you found that 400ml water takes 10 minutes time then what is the percolation rate of the land? (05)
Q:- 9 Draw the diagram of the digestive system of ruminating animal and write down the names of any two organs. (05)
Q:- 10 Do as directed.
(1) How will you make China rose (jasudpatra) using materials found around you? (03)
(2)How will you make anemometer using materials found around you? How will you use it? (03)
Q:- 11 Do as directed. (10)
(1) Explain the usefulness of chemical changes in everyday life.
(2) Which effective safety measures will you take during cyclone?
Answers
Answered by
3
Answer:
wright one question please
Answered by
0
Question 1(A)
A - Molars
B - Premolars
C - Canines
Question 1(B)
1) Sheep
2) Kashmir goat
3) Jute
Question 2(1)
1) A B
1. Digestion of starch B. Small intestine
2. Absorption of water E. mouth
3. Dead components in the soil A. Organic substances
4. A-level F. Presence of more mineral
5. B-level D. Habitat of ant, rat, and other such
living organisms
Question 2(2)
1) Laboratory thermometer
- It is used to measure the temperature in the laboratory.
- It is graduated from -10°C to 110°C.
- No kink is present.
- Je_rk is not given to lower the mercury level.
- Temperature is read while being in contact without the source.
- It is large in size.
Clinical thermometer
- It is used to measure the body's temperature.
- Graduated from 35°C to 42°C or 94°F to 108°F.
- It has a kink.
- Je_rk is given to lower the mercury level.
- Temperature can read after removing it.
- Small in size.
2)Acid
- An acid is any substance that donates a proton
- When acids dissolve in water, they release hydrogen ions (H⁺)
- An acid is a substance that accepts the pair of electrons (an electrophile) and will have a lone pair of electrons.
- pH value is less than 7.0
Base
- A base is any substance that accepts a proton.
- When bases dissolve in water, they release hydroxide ions (OH⁻)
- A base is a substance that donated the pair of electrons (a nucleophile) and will have a lone pair of electrons.
- pH value is usually greater than 7.0 and could go up to 14 in the case of strong bases.
Question 3
1) Chemical change
2) Chemical change
3) Physical change
4) Physical change
5) Physical change
6) Chemical change
Please ask one question at a time.
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