7th Standard Syllabus & Materials
7th Standard
TN 7th Tamil பருவம் -1 இயல் 1 - அமுதத்தமிழ் - ஒன்றல்ல இரண்டல்ல Important Questions And Answers Study Material - QB365 Set A
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Published on: 19/08/2019
Download Tamil Nadu 7th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
From the given v-t graph it can be inferred that the object is _______.
in uniform motion
at rest
in non uniform motion
moving with uniform acceleration
2.
Sleep is not only good for our body, but it is also good for ________ .
Enjoyment
Relaxation
Mind
Environment
3.
Pollinators are _________.
Wind
Water
Insect
All the above
4.
Which software is used to create symbols?
Photoshop
Illustrator
Vector Graphics
Photostory
5.
Which of the following is a short and scientific way of representing one molecule of an element or compound?
Mathematical formula
Chemical formula
Mathematical symbol
Chemical symbol
6.
Find the area of the following regular shaped figures: (Take \(\pi\) = 22/7)
(a) A rectangle whose length is 12 m and breadth is 4 m.
(b) A circle whose radius is 7 m.
(c) A triangle whose base is 6 m and height is 8 m.
7.
What is atomic number?
8.
What is hygiene?
9.
Write the chemical formula and name the elements present in the following compounds:
a. Sodium chloride
b. Potassium hydroxide
c. Carbon dioxide
d. Calcium oxide
e. Sulphur dioxide
10.
Define – pollination.
11.
Give the formula to find the density of objects.
12.
Area
13.
Speed of ship
14.
Tuberculosis
15.
Phylloclade
16.
Video Story
17.
The rate of change of velocity is_______.
18.
The hair follicles produce _____ which keeps the hair smooth.
19.
________is the only non-metal conducts electricity.
20.
Density of mercury is ________.
21.
__________is the basal swollen part of the Gynoecium.
22.
A ball of iron floats in mercury.
23.
Leaves of Aloe vera are fleshy and store water.
24.
A solid cylinder of mass 280 kg has a volume of 4 m3. Find the density of cylinder.
25.
Differentiate mass number from atomic number.
26.
Name the mode of transmission of communicable disease.
27.
Draw the structure of an atom and explain the position of the sub-atomic particles.
28.
Write about any three Communicable diseases in details.
29.
Assertion (A) : We must offer first aid to a bleeding person.
Reason (R) : We must not use gloves while helping them.
(a) Both A and R are true
(b) Both A and R are false
(c) A is true but R is false
(d) A is false but R is true
30.
Assertion (A): Volume is a derived quantity.
Reason (B): The amount of space occupied by a three dimensional object is known as its volume
(a) Both A and R are true but R is not the correct reason.
(b) Both A and R are true and R is the correct reason.
(c) A is true but R is false.
(d) A is false but R is true
31.
Assertion (A): The distance between two celestial bodies is measured by the unit of light year
Reason (B): The distance travelled by the light in one year in vacuum is called one light year
(a) Both A and R are true but R is not the correct reason.
(b) Both A and R are true and R is the correct reason.
(c) A is true but R is false.
(d) A is false but R is true.
32.
Mass number determines the number of atoms of an element that combines with atom or atoms of another type.
33.
Most of the space in an atom is occupied by electrons
34.
Non-metals are usually, good conductors of heat and electricity.
35.
| Element | Latin Name | Symbol |
| Mercury | - | Hg |
| Lead | Plumbum | - |
| Iron | - | Fe |
| Potassium | Kalium | - |
36.
Complete the following table by writing compound of its constituent:
| Compound | Constituent elements |
| Sodium carbonate | Sodium, Carbon, Oxygen |
| Water | (i) ? |
| Calcium oxide | (ii) ? |
| Sugar | Carbon, Hydrogen, Oxygen |
37.
| Underground stem | __ (1)__ | Ginger |
| __ (2)__ | Runner | __ (3)__ |
| Leaf modification | __ (4)__ | Acacia |
| Root modification | sucking Roots | __ (5)__ |
1.
(d)
moving with uniform acceleration
2.
(c)
Mind
3.
(d)
All the above
4.
(c)
Vector Graphics
5.
(b)
Chemical formula
6.
(a) Area of rectangle = length \(\times\) breadth
= 12 \(\times\) 4 = 48 m2
(b) Area of circle
\(=\pi \times r^{2}=(22 / 7) \times 7 \times 7 \\ =154 \mathrm{~m}^{2}\)
(c) Area of triangle
\(=1 / 2 \times \text { base } \times \text { height } \\ =1 / 2 \times 6 \times 8=24 \mathrm{~m}^{2}\)
7.
The number of electrons or protons is an atom is called the atomic number (Z) of an atom.
8.
Hygiene refers to the good habits and the practices which is followed to prevent diseases, maintain good health, especially through cleanliness, consumption of safe drinking water and proper disposal of sewage.
9.
| Compound | Chemical fromula | Name of the elements | |
| a. | Sodium chloride | NaCI | Sodium (Na), Chlorine (CI) |
| b. | Potassium hydroxide | KOH | Potassium (K), Oxygen (O), Hydrogen(H) |
| c. | Carbon dioxide | CO2 | Carbon (C), Oxygen (O2) |
| d. | Calcium oxide | CaO | Calcium (C), Oxygen (O2) |
| e. | Sulphur dioxide | SO2 | Sulphur (S), Oxygen (O2) |
10.
The process by which pollen grains reach stigma is called as pollination.
11.
Density (D) = mass (M) / volume (V).
12.
plane figures
13.
Knot
14.
Mycobacterium
15.
Opuntia
16.
Microsoft Photostory
17.
( )
acceleration
18.
( )
oil
19.
( )
Graphite
20.
( )
13,600 kg/m3
21.
( )
Ovary
22.
True
23.
True
24.
Density of cylinder \(=\frac { mass \ of \ cylinder }{ volume \ of \ cylinder }\)
\(=\frac{280}{4}=70 \mathrm{~kg} / \mathrm{m}^{3}\)
25.
| Atomic number | Mass number |
| Atomic number = No of protons (or) No of electrons | Mass number = No of protons + No of neutrons |
| Z = P or e | A = P+n |
| Ex: Atomic number (z) of helium is 2 | Ex: Mass nurnber (A) of helium is 4 |
26.
Communicable diseases spread through contaminated air, water, food or vectors like insects and other animals.
i. Air - Tuberculosis ; Water - Cholera
ii. Insects - Dengue ; Animals - Plaque.
27.
Sub-atomic particles:
(i) Proton (p): This is the positively charged particle and it is located at the nucleus.
(ii) Neutron (n): Neutron is inside the nucleus. The neutron does not have any charge. Except hydrogen (protium), the nucleus of all atoms contain neutrons.
(iii) Electron(e): This is a negatively charged particle. Electrons revolve around the nucleus of the atom in specific orbits.
28.
Tuberculosis:
(i) Causative agent : Mycobacterium tuberculae bacteria.
(ii) Transmission : Spread from one person to another through air by spitting and prolonged contact with patient.
(iii) Symptoms : Fever, weight loss, chronic cough, bloody spitting and difficulty in breathing
(iv) Prevention and treatment : BCG vaccinations. Giving special attention to the patient. Regular medication like DOT
Chicken pox:
(i) Causative agent : varicella zoster virus.
(ii) Transmission : Spread through air and contact with infected person.
(iii) Symptoms : Appearance of rashes on the whole body, fever, headache and tiredness.
(iv) Prevention and treatment : Chicken pox vaccine is the best way to prevent. Special attention should be given to infected person
Robies:
(i) Causative agent: Virus (rhabdo virus)
(ii) Transmission : By the bite of the infected dog, cat, etc.
(iii) Symptoms: Hydrophobia, fever for 2-12 weeks and exaggerations
(iv) Prevention and treatment : Fatality can be prevented by timely vaccination before onset of symptoms.
29.
(c) A is true but R is false
30.
(a) Both A and R are true but R is not the correct reason.
31.
(a) Both A and R are true but R is not the correct reason.
32.
(b)
33.
(a)
34.
(b)
35.
| Element | Latin Name | Symbol |
| Mercury | Hydrargyrum | Hg |
| Lead | Plumbum | Pb |
| Iron | Ferrum | Fe |
| Potassium | Kalium | K |
36.
| Compound | Constituent elements |
| Sodium carbonate | Sodium, Carbon, Oxygen |
| Water | Hydrogen, Oxygen |
| Calcium oxide | Calcium, Oxygen. |
| Sugar | Carbon, Hydrogen, Oxygen |
37.
| Underground stem | Rhizome | Ginger |
| Sub aerial stem | Runner | Centella |
| Leaf modification | phylloda | Acacia |
| Root modification | sucking Roots | Cuscuta |
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Tamilnadu Stateboard 7th Standard Subjects
Tamilnadu Stateboard Standards
