7th Science - Term 1 Exam 2024 - Original Question Paper with Solutions | Thoothukudi District

7th Science - Term 1 Exam 2024 - Original Question Paper with Solutions | Thoothukudi District

7th Science - Term 1 Exam 2024 - Original Question Paper with Solutions | Thoothukudi District

Samacheer Kalvi | Standard VII | First Term Summative Exam - 2024

7th Standard Science First Term Exam Question Paper 2024

Original Question Paper

Standard: VII
Subject: SCIENCE
Exam: First Term Summative Exam - 2024
Time: 2.00 hrs
Marks: 60

I. Choose the correct answer: (12×1=12)

  1. SI unit of density is ______.
    a) Kg/m² b) Kg/m³ c) Kg/m d) g/m²
  2. ______ is an example for a metal.
    a) Iron b) Oxygen c) Helium d) Water
  3. The metal which is in liquid at room temperature ______.
    a) Chlorine b) Sulphur c) Mercury d) Silver
  4. ______ is positively charged particle.
    a) Proton b) Electron c) molecule d) Neutron
  5. ______ is an insectivorous plant.
    a) Onion b) Nepenthes c) Ginger d) Turmeric
  6. Vegetative propogation by leaves takes place in ______.
    a) Bryophyllum b) fungi c) virus d) bacteria
  7. Reproductive part of a plant is ______.
    a) Root b) Stem c) Leaf d) Flower
  8. Our living place should be ______.
    a) Open b) closed c) clean d) unclean/untidy
  9. Tobacco chewing causes ______.
    a) Anemia b) Periolontis c) Tuberculosis d) Pneumonia
  10. ______ is an example for animation.
    a) Sound communication b) Visual communication c) Vector communication d) Raster communication
  11. ______ software is used to create symbols.
    a) Photoshop b) Illustrator c) vector graphics d) photo story
  12. ______ is derived unit.
    a) mass b) time c) area d) length

II. Fill in the blanks: (5×1=5)

  1. In ______ equilibrium the centre of gravity remains at the same height when it is displaced.
  2. The smaller particles of matter that can exist by itself is ______.
  3. Eyes are considered as ______ to the world.
  4. Onion and garlic are examples for ______.
  5. The ______ revolve around the nucleus.

III. Match the following: (5×1=5)

Column A Column B
18) Rabies Opuntia
19) Tuberculosis Avicenia
20) Phylloclade Chrysanthemum
21) Breathing roots Mycobacterium
22) Sucker Hydrophobia

IV. Answer any 9 questions from the following: (9×2=18)

  1. Define: Pollination.
  2. What is Raster graphics?
  3. Analogy:
    a) Tuberculosis: Air Cholera : ______
    b) Typhoid: Bacteria Hepatitis : ______
  4. Give any two communicable diseases which spread in your locality during monsoon.
  5. Write True or False. If false write the correct statement
    a) Leaves of Aloevera are fleshy and store water.
    b) NaCl represent one molecule of sodium chloride.
  6. A solid cylinder of mass 280kg has a volume of 4m³. Find the density of a cylinder.
  7. What is one light year?
  8. What do you mean by constant acceleration?
  9. Write the chemical formula for the following elements:
    a) Hydrogen b) Nitrogen c) Ozone d) Sulphur
  10. What is atomicity of elements?
  11. Why neutrons are called neutral particles?
  12. Name the mode of transmission of communicable diseases.

V. Answer in detail: (any 4) (4×5=20)

  1. Write the chemical formula and the name of the elements present in the following compounds.
    i) Sodium chloride ii) Potassium hydroxide iii) Carbon dioxide iv) Calcium oxide v) Sulphur dioxide
  2. With the help of microsoft photostory how will you create a video?
  3. Draw and label the parts of a flower.
  4. The atomic number and the mass number of an element is 26 and 56 respectively. Calculate the number of electrons, protons and neutrons in its atom.
  5. Differentiate metals and non metals.
  6. List the situations in which first aid is given. What would you do if a person suffers from skin burns?

Solutions

I. Choose the correct answer

  1. b) Kg/m³
  2. a) Iron
  3. c) Mercury
  4. a) Proton
  5. b) Nepenthes
  6. a) Bryophyllum
  7. d) Flower
  8. c) clean
  9. b) Periolontis (Periodontitis - gum disease)
  10. b) Visual communication
  11. b) Illustrator
  12. c) area

II. Fill in the blanks

  1. In neutral equilibrium the centre of gravity remains at the same height when it is displaced.
  2. The smaller particles of matter that can exist by itself is an atom.
  3. Eyes are considered as windows to the world.
  4. Onion and garlic are examples for bulbs.
  5. The electrons revolve around the nucleus.

III. Match the following

Column ACorrect Match (Column B)
18) RabiesHydrophobia
19) TuberculosisMycobacterium
20) PhyllocladeOpuntia
21) Breathing rootsAvicenia
22) SuckerChrysanthemum

IV. Answer any 9 questions

  1. Define: Pollination.
    The transfer of pollen grains from the anther to the stigma of a flower is called pollination.
  2. What is Raster graphics?
    Raster graphics are images created using a grid of pixels. They are also known as bitmaps. When scaled up, they lose quality and become pixelated. Examples include photographs (JPEG, PNG).
  3. Analogy:
    a) Tuberculosis: Air :: Cholera : Water/Food
    b) Typhoid: Bacteria :: Hepatitis : Virus
  4. Give any two communicable diseases which spread in your locality during monsoon.
    Two common communicable diseases during monsoon are Cholera and Dengue fever.
  5. Write True or False. If false write the correct statement.
    a) Leaves of Aloevera are fleshy and store water. True.
    b) NaCl represent one molecule of sodium chloride. True.
  6. A solid cylinder of mass 280kg has a volume of 4m³. Find the density of a cylinder.
    Given: Mass (m) = 280 kg, Volume (V) = 4 m³.
    Formula for density (\(\rho\)): \( \rho = \frac{Mass}{Volume} \)
    \( \rho = \frac{280 \text{ kg}}{4 \text{ m}^3} \)
    \( \rho = 70 \text{ kg/m}^3 \)
    The density of the cylinder is 70 kg/m³.
  7. What is one light year?
    A light-year is the distance that light travels in one year in a vacuum. It is a unit of astronomical distance, approximately equal to 9.46 trillion kilometres.
  8. What do you mean by constant acceleration?
    Constant acceleration means that the velocity of an object changes by an equal amount in every equal interval of time. The object's speed increases or decreases at a steady rate.
  9. Write the chemical formula for the following elements:
    a) Hydrogen: H₂
    b) Nitrogen: N₂
    c) Ozone: O₃
    d) Sulphur: S₈
  10. What is atomicity of elements?
    Atomicity is the total number of atoms present in one molecule of an element, compound or a substance. For example, the atomicity of Oxygen (O₂) is 2.
  11. Why neutrons are called neutral particles?
    Neutrons are called neutral particles because they have no net electric charge. They are neither positive (like protons) nor negative (like electrons).
  12. Name the mode of transmission of communicable diseases.
    Communicable diseases can be transmitted through:
    1. Direct contact (touching, kissing).
    2. Indirect contact (contaminated objects).
    3. Droplets (coughing, sneezing).
    4. Air (airborne particles).
    5. Vectors (insects like mosquitoes, flies).
    6. Contaminated food and water.

V. Answer in detail

  1. Write the chemical formula and the name of the elements present in the following compounds.
    1. Sodium chloride: Formula: NaCl. Elements: Sodium (Na) and Chlorine (Cl).
    2. Potassium hydroxide: Formula: KOH. Elements: Potassium (K), Oxygen (O), and Hydrogen (H).
    3. Carbon dioxide: Formula: CO₂. Elements: Carbon (C) and Oxygen (O).
    4. Calcium oxide: Formula: CaO. Elements: Calcium (Ca) and Oxygen (O).
    5. Sulphur dioxide: Formula: SO₂. Elements: Sulphur (S) and Oxygen (O).
  2. With the help of microsoft photostory how will you create a video?
    Microsoft Photo Story is a free application that allows users to create audiovisual presentations from their digital photos. The steps to create a video are:
    1. Start a new project: Open Photo Story and choose 'Begin a new story'.
    2. Import Pictures: Import the pictures you want to use in your video. You can arrange them in the desired order in the timeline at the bottom.
    3. Add Titles and Effects: You can add text to your pictures. You can also apply effects like black and white, sepia, etc.
    4. Narrate and Customize Motion: Record narration for each picture. You can also customize the pan and zoom effects (motion) for each picture to create a dynamic feel.
    5. Add Background Music: Select a music file from your computer to use as a background score for the entire video. Photo Story can also auto-generate music.
    6. Save your Story: Save the project as a video file (WMV format) that can be played on a computer or shared with others.
  3. Draw and label the parts of a flower.
    A typical flower consists of four main parts arranged in whorls: Calyx, Corolla, Androecium, and Gynoecium.
    Diagram of the parts of a flower
    The main parts are:
    • Pedicel: The stalk that supports the flower.
    • Receptacle: The part of the flower stalk where the parts of the flower are attached.
    • Sepals (Calyx): The outer leaf-like parts that protect the bud.
    • Petals (Corolla): The brightly colored parts that attract insects for pollination.
    • Stamen (Androecium): The male reproductive part, consisting of the anther (produces pollen) and the filament (stalk).
    • Pistil/Carpel (Gynoecium): The female reproductive part, consisting of the stigma (receives pollen), style (connects stigma to ovary), and ovary (contains ovules).
  4. The atomic number and the mass number of an element is 26 and 56 respectively. Calculate the number of electrons, protons and neutrons in its atom.
    Given:
    Atomic Number (Z) = 26
    Mass Number (A) = 56

    1. Number of Protons:
    The number of protons is equal to the atomic number.
    Number of Protons = Atomic Number = 26.

    2. Number of Electrons:
    In a neutral atom, the number of electrons is equal to the number of protons.
    Number of Electrons = Number of Protons = 26.

    3. Number of Neutrons:
    The number of neutrons is the mass number minus the atomic number.
    Number of Neutrons = Mass Number (A) - Atomic Number (Z)
    Number of Neutrons = 56 - 26 = 30.

    Result:
    • Protons = 26
    • Electrons = 26
    • Neutrons = 30
    (The element is Iron - Fe). Electronic Configuration of Iron (Fe)
  5. Differentiate metals and non metals.
    Property Metals Non-metals
    Physical State Solid at room temperature (except Mercury). Exist in all three states (solid, liquid, gas).
    Lustre Have a shiny appearance (lustrous). Dull appearance (non-lustrous), except Iodine.
    Malleability Can be beaten into thin sheets (malleable). Cannot be beaten into sheets (brittle).
    Ductility Can be drawn into wires (ductile). Cannot be drawn into wires (non-ductile).
    Conductivity Good conductors of heat and electricity. Poor conductors of heat and electricity (except Graphite).
    Sonority Produce a ringing sound when struck (sonorous). Do not produce a sound (non-sonorous).
  6. List the situations in which first aid is given. What would you do if a person suffers from skin burns?
    Situations requiring first aid:
    • Cuts and scrapes
    • Burns (from heat, chemicals, or electricity)
    • Fractures and sprains
    • Nosebleeds
    • Insect bites or stings
    • Fainting or unconsciousness
    • Poisoning
    • Choking
    First aid for skin burns:
    If a person suffers from minor skin burns, you should follow these steps:
    1. Cool the Burn: Immediately hold the burned area under cool (not cold) running water for about 10-15 minutes or until the pain subsides. A clean, wet cloth will also work.
    2. Remove Tight Items: Gently remove rings, watches, or other tight items from the burned area before it starts to swell.
    3. Do Not Break Blisters: If blisters form, do not break them, as this can lead to infection.
    4. Apply Lotion: Once the burn is cooled, you can apply an aloe vera lotion or moisturizer to prevent drying. Do not apply butter, oil, or toothpaste.
    5. Cover the Burn: Cover the burn with a sterile gauze bandage loosely. Do not use fluffy cotton that may leave fibers in the wound.
    6. Seek Medical Help: For major burns, or burns on the face, hands, feet, or genitals, seek immediate medical attention.
Labels: , , , , , , ,