7th Science First Term Summative Assessment Question Paper with Answers 2024-25 | Villupuram District
Class: 7
Subject: SCIENCE
Time Allowed: 2.00 Hours
Max. Marks: 60
1.Light year is the unit of
2.An element which is always Lustrous, Malleable and Ductile is
3.Which one of the following is an example for a metal.
4.Oxygen, Hydrogen and Sulphur are examples for
5.The metal which is liquid at room temperature is
6.The basic unit of Matter is __________
7.__________ is positively charged.
8.Vegetative Propagation by leaves takes place in
9.Reproductive part of a Plant is
10.Climbing roots are seen in
11.Eyes are considered as windows to the world.
12.Tuberculosis is caused by the Bacterium Mycobacterium tuberculosis.
13.The male Reproductive part of a Flower is Androecium / Stamen.
14.After Fertilization the ovules becomes seeds.
15.Breathing Roots are seen in mangrove plants.
16.The smaller particles found in the atom are called sub-atomic particles.
17.Graphite is the only Non - metal which conducts electricity.
18.The smallest particle of matter that can exist by itself is molecule.
19.There are 118 number of known elements.
20.The Rate of Change of velocity is acceleration.
| Question | Correct Match |
|---|---|
| 21. Displacement | Metre |
| 22. Light travelling through vacuum | Uniform Velocity |
| 23. Speed of Ship | Knot |
| 24. Centre of gravity of geometrical shaped objects | Geometric centre |
| 25. Stability | Larger base area |
26.What is One light year?
27.Define - Astronomical Unit.
28.Length of Scale : metre :: Speed of Aeroplane : ?
29.Define Molecule.
30.Write the Chemical formula for the following elements.
a) Hydrogen - H₂
b) Nitrogen - N₂
c) Ozone - O₃
d) Sulphur - S₈
31.Name the Sub - atomic particles.
- Protons
- Neutrons
- Electrons
32.What are the Characteristics of Proton?
- It is a positively charged particle.
- It is located in the nucleus of an atom.
- Its mass is approximately 1.672 x 10-27 kg.
33.What are the two important parts of a Flower.
- Androecium: The male reproductive part.
- Gynoecium: The female reproductive part.
34.Define Pollination.
35.What is Hygiene?
36.Give any two Communicable diseases, which spread in your locality during Monsoon.
- Cholera
- Typhoid
37.What first aid will you provide in the case of Bruises?
38.Write about any three Communicable diseases in detail.
1. Cholera:
- Causative agent: Bacterium (Vibrio cholerae).
- Mode of transmission: Spreads through contaminated food and water.
- Symptoms: Severe diarrhoea, vomiting, and dehydration.
- Prevention: Drinking boiled water, maintaining proper sanitation, and vaccination.
2. Tuberculosis (TB):
- Causative agent: Bacterium (Mycobacterium tuberculosis).
- Mode of transmission: Spreads through the air when an infected person coughs or sneezes (droplet infection).
- Symptoms: Persistent cough, fever, weight loss, and night sweats.
- Prevention: BCG vaccination, avoiding contact with infected persons, and maintaining good hygiene.
3. Common Cold:
- Causative agent: Virus (Rhinovirus).
- Mode of transmission: Spreads through droplets from coughing or sneezing and by touching contaminated surfaces.
- Symptoms: Runny nose, sore throat, sneezing, and cough.
- Prevention: Frequent hand washing, avoiding touching the face, and covering the mouth and nose while coughing or sneezing.
39.Write a brief account on Pollination.
Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. The goal of every living organism, including plants, is to create offspring for the next generation. Pollination is the first step in this process for flowering plants.
Types of Pollination:
- Self-Pollination: The transfer of pollen grains from the anther to the stigma of the same flower or another flower on the same plant.
- Cross-Pollination: The transfer of pollen grains from the anther of one flower to the stigma of a flower on another plant of the same species.
Agents of Pollination:
Pollination is carried out by various agents:
- Wind (Anemophily): Pollen is light and non-sticky, produced in large quantities (e.g., maize, pine).
- Water (Hydrophily): Occurs in aquatic plants (e.g., Vallisneria, Hydrilla).
- Insects (Entomophily): Flowers are often large, colourful, fragrant, and rich in nectar to attract insects like bees and butterflies.
- Animals (Zoophily): Birds, bats, and other animals help in pollination.
40.Draw the Structure of an Atom and Explain the position of the sub - atomic particles.
Structure of an Atom:
Position of Sub-atomic Particles:
An atom consists of a central nucleus and surrounding electrons. The positions are as follows:
- Nucleus: This is the dense, central core of the atom. It contains two types of sub-atomic particles:
- Protons: They are positively charged particles.
- Neutrons: They have no charge (they are neutral).
- Electron Shells/Orbits:
- Electrons: They are negatively charged particles that revolve around the nucleus in fixed, circular paths called orbits or shells. Electrons are very light compared to protons and neutrons. The number of electrons is equal to the number of protons in a neutral atom.
41.Differentiate Metals and Non - Metals.
| Property | Metals | Non-Metals |
|---|---|---|
| Lustre | They have a shiny surface (lustrous). | They have a dull appearance (non-lustrous), except for iodine and graphite. |
| Hardness | Generally hard and strong (except sodium, potassium). | Generally soft (except diamond). |
| State | Solid at room temperature (except mercury). | Exist as solids, liquids, or gases at room temperature. |
| Malleability | Can be beaten into thin sheets. | Cannot be beaten into thin sheets (brittle). |
| Ductility | Can be drawn into thin wires. | Cannot be drawn into wires (non-ductile). |
| Conduction | Good conductors of heat and electricity. | Poor conductors of heat and electricity (except graphite). |
42.Write about the experiment to find the Centre of Gravity of the irregularly shaped plate.
Aim: To find the centre of gravity of an irregularly shaped lamina using a plumb line.
Materials Required: Irregularly shaped lamina (cardboard), retort stand, plumb line, pin, and pencil.
Procedure:
- Make three small holes near the edge of the lamina and label them A, B, and C.
- Suspend the lamina freely from hole A using the pin from the retort stand.
- Hang the plumb line from the same pin and wait for it to come to rest.
- Draw a straight line (AD) on the lamina along the thread of the plumb line.
- Repeat the experiment by suspending the lamina from hole B. Draw another line (BE) along the plumb line.
- Again, repeat the process by suspending the lamina from hole C and draw a third line (CF).
Observation: You will observe that all three lines (AD, BE, and CF) intersect at a common point.
Conclusion: The point of intersection, G, is the centre of gravity of the irregularly shaped lamina.