Showing posts with label class8-science. Show all posts
Showing posts with label class8-science. Show all posts

Thursday, 5 May 2022

Class 8 - Science - Force and Pressure (Questions and Answers) #class8Physics #HighSchoolScience #eduvictors

Class 8 - Science - Force and Pressure (Questions and Answers)

Class 8 - Science - Force and Pressure (Questions and Answers) #class8Physics #HighSchoolScience #eduvictors


Q1. State the effects of force.

Answer: Force may:

make an object move from rest.

change the speed of a moving object.

change the direction of motion of an object.

change the shape of an object.

stop a moving object


Q2. Calculate the pressure exerted by a force of 100 N on an area of 4 m²

Tuesday, 21 December 2021

CBSE Class 8 Science - Combustion and Flame - Worksheet-2 #class8Science #eduvictors #combustion

CBSE Class 8 Science - Combustion and Flame - Worksheet-2

CBSE Class 8 Science - Combustion and Flame - Worksheet #class8Science #eduvictors #combustion


Fill in the blanks with suitable words.


1. ________ gas in air is essential for combustion.


2. A chemical process in which a substance reacts with oxygen to give off heat is called __________.


3. During the process of combustion, _______ and light are given out.

Monday, 15 November 2021

Class 8 Science - Pollution in Air and Water (MCQs) #class8Science #environment #pollution #eduvictors

Pollution in Air and Water (MCQs)

Class 8 Science

Class 8 Science - Pollution in Air and Water (MCQs) #class8Science #environment #pollution #eduvictors

Q1: In general, oxides of non metals are ________ in nature?

(a) basic

(b) acidic

(c) neutral

(d) amphoteric



Q2: The percentage of which of the following components of air always varies from one place to the other?

(a) O₂ 

(b) N₂ 

(c) Water vapour 

(d) CO₂

Thursday, 21 October 2021

Class 8 Biology - Reaching the Age of Adolescence (Worksheet) (#class8Biology)(#class8Science)(#eduvictors)

Class 8 Biology - Reaching the Age of Adolescence (Worksheet)

Class 8 Biology - Reaching the Age of Adolescence (Worksheet) (#class8Biology)(#class8Science)(#eduvictors)


Fill in the blanks with suitable words.

1. The period of life, when the body undergoes certain noticeable changes, leading to reproductive maturity is called __________. 


2 _______ is the start of the time when a boy is biologically ready to become a father and a girl is ready to become a mother.


3. ______ are thread-like structures in the nucleus carrying genetic information.


Wednesday, 8 September 2021

CBSE Class 8 Chemistry - Metals and Non-Metals (MCQs) (#class8Chemistry)(#class8Science)(#eduvictors)

CBSE Class 8 Chemistry - Metals and Non-Metals (MCQs) 

CBSE Class 8 Chemistry - Metals and Non-Metals (MCQs)  (#class8Chemistry)(#class8Science)(#eduvictors)

Q1: All metals are solids except: 

(a) Sodium

(b) Calcium

(c) Mercury

(d) Copper



Q2: Which of the following metal does not react with dilute Hydrochloric acid?

(a) Iron

(b) Sodium

(c) Magnesium

(d) Copper

Monday, 9 August 2021

CBSE Class 8 - Science - Stars and The Solar System - Worksheet (#class8Science)(#eduvictors)

Stars and The Solar System - Worksheet

CBSE Class 8 - Science

CBSE Class 8 - Science - Stars and The Solar System - Worksheet (#class8Science)(#eduvictors)


Fill in the blanks with suitable words:


1. The stars, the planets, the moon and many other objects in the sky are called _________ objects.


2. The various shapes of the bright part of the moon as seen during a month are called ________ of the moon.


3. The moon is visible due to reflected ________.

Wednesday, 16 June 2021

CBSE Class 8 Science - Chapter: Coal and Petroleum (Worksheet)(#class8Science)(#eduvictors)

CBSE Class 8 Science - Chapter: Coal and Petroleum (Worksheet)

CBSE Class 8 Science - Chapter: Coal and Petroleum (Worksheet)(#class8Science)(#eduvictors)



Fill in the blanks with suitable words.


1. _________ are the substances obtained from petroleum and natural gas.


2. Petroleum is obtained from dead remains of living organisms, that is why it is called a ________ fuel.


3. Kerosene is used in ______ aircrafts.


4. In India, ________ gas has been found in Tripura, Rajasthan, Maharashtra and in the Krishna Godavari delta.

Thursday, 13 May 2021

Class 8 - Science - Crop Production and Management (Worksheet) (#class8Science)(#eduvictors)

Class 8 - Science - Crop Production and Management (Worksheet)

Class 8 - Science - Crop Production and Management (Worksheet) (#class8Science)(#eduvictors)


Fill in the blanks with suitable words:


1. Cultivation of plants and rearing of animals for food and other beneficial items is called ____________.



2. When plants of the same kind are grown and cultivated at one place on a large scale, it is called a ________.



3. The process of loosening and turning of the soil is called _________ or _________.


Thursday, 22 April 2021

CBSE Class 8 - Chemistry - Synthetic Fibres and Plastics - Plastics Uses and Its Impact on Environment (Q and A)(#class8Science)(#eduvictors)

CBSE Class 8 - Chemistry - Synthetic Fibres and Plastics - Plastics Uses and Its Impact on Environment (Q and A)

CBSE Class 8 - Chemistry - Synthetic Fibres and Plastics - Plastics Uses and Its Impact on Environment (Q and A)(#class8Science)(#eduvictors)

Q1: What is a plastic?

Answer: Plastic is also a polymer like the synthetic fibre. All plastics do not have the same arrangement of units. In some, it is linear, whereas in others it is cross-linked.

CBSE Class 8 - Chemistry - Synthetic Fibres and Plastics - Plastics Uses and Its Impact on Environment (Q and A)(#class8Science)(#eduvictors)


Q2: What are the main properties of plastics?

Answer: 

① Plastic is easily mouldable in all types of possible shapes. 

② Most plastics are light, chemically stable and do not rust. The weight of plastic is less when compared to that of metal.

③ Some types of plastics are good insulaters and have low thermal conductivity.

④ Plastic can be recycled, coloured, reused, rolled into sheets or made into wires.

⑤ Most plastics have poor heat resistance.

⑥ Plastics have good durability (lasts longer).


Friday, 23 October 2020

CBSE Class 8 - Science - Conservation of Plants and Animals (Worksheet)(#class8Science)(#ConservationWorksheet)(#eduvictors)

CBSE Class 8 - Science - Conservation of Plants and Animals (Worksheet)

CBSE Class 8 - Science - Conservation of Plants and Animals (Worksheet)(#class8Science)(#ConservationWorksheet)(#eduvictors)


Directions: Fill in the blanks with suitable words:


1. Plants and animals of a particular area are known as the _________ and __________ of that area.


2. Red Data Book contains a record of __________ species.


3. _________ is the restocking of destroyed forests by planting new trees.

Friday, 25 September 2020

CBSE Class 8 - Science - Combustion and Flame (Worksheet)(#class8Science)(#combustion)(#eduvictors)

Class 8 - Science - Combustion and Flame (Worksheet)

CBSE Class 8 - Science - Combustion and Flame (Worksheet)(#class8Science)(#combustion)(#eduvictors)


Directions: Fill in the blanks with suitable words/definitions.

1. The combustion in which the gas burns rapidly and produces heat and light is called ________ combustion.


2. The combustion in which no external heat is given is known as __________ combustion. e.g. burning of white phosphorus in air.


3. The combustion in which large amount of gases are evolved with the production of tremendous amount of heat, light and sound is called _________.

Friday, 7 August 2020

Class 8 Science - Metals and Non-Metals (Worksheet) (#eduvictors)(#cbse2020)(#class8Science)

Metals and Non-Metals (Worksheet)

Class 8 Science (Based on CBSE Syllabus)
Class 8 Science - Metals and Non-Metals (Worksheet) (#eduvictors)(#cbse2020)(#class8Science)

Fill in the blanks with suitable words.

1. A metal that is liquid at room temperature______________


2. A non-metal that is liquid at room temperature ______________


3. Two metals that can be easily cut with knife __________and ___________


4. A property which allows metals to be hammered into thin sheets _______________


5. A property which enables metals to be drawn into wires _________________

Sunday, 19 July 2020

CBSE Class 8 Science - Biology Microorganisms Friend and Foe - Worksheet (#cbse)(Class8Biology)(#eduvictors)

Class 8 Science - Biology Microorganisms Friend and Foe - Worksheet 

CBSE Class 8 Science - Biology Microorganisms Friend and Foe - Worksheet (#cbse)(Class8Biology)(#eduvictors)


Fill in the blanks with suitable words:


1. The science which studies about microorganisms is known as _________________.


2. Microbes can be seen with the help of a  _______________.


3. Blue-green algae fix ___________  directly from air to enhance the fertility of the soil.


4. Alcohol is produced with the help of ___________


5. Cholera is caused by ________.


Friday, 12 June 2020

CBSE Class 8 - Science -Chapter 7 - Conservation of Plants and Animals (Questions and Answers)(#eduvictors)(#class8Science)

Chapter 7 -  Conservation of Plants and Animals (Questions and Answers)

CBSE Class 8 - Science

CBSE Class 8 - Science -Chapter 7 -  Conservation of Plants and Animals (Questions and Answers)(#eduvictors)(#class8Science)

Q1: Define ecology.

Answer: It is the science which deals with the relation between organism and its surrounding environment.


Q2: What is a biome?

Answer: A biome is a large area with similar flora, fauna, and microorganisms. Each biome can have many ecosystems in it. For examples the
tropical rainforests, tundra in the arctic regions, and the evergreen trees in the coniferous forests, each of these contain species that are adapted to the varying conditions of water, heat, and soil in the biome.

For example, polar bears thrive in the arctic by having thick skin while cactus plants preserve water in the hot desert with help of spiny leaves with waxy layer coating.


Wednesday, 29 April 2020

CBSE Class 8 - Science - Force, Pressure and Friction (Multiple Choice Questions)(#eduvictors)(#cbseClass8Science)

Force, Pressure and Friction 
(Multiple Choice Questions)

CBSE Class 8 - Science
CBSE Class 8 - Science - Force, Pressure and Friction (Multiple Choice Questions)(#eduvictors)(#cbseClass8Science)


Q1. Force on an object
  (a) must change the speed of the object if it is moving.
  (b) may change the direction of motion.
  (c) must change the shape of object. .
  (d) none of these


Q2. Strength of a force is expressed by 
   (a) Magnitude
   (b) Direction
   (c) Both magnitude and direction
   (d) none of these

3. Force of friction is
   (a) contact force
   (b) non-contact force
   (c) gravitational force
   (d) electrostatic force

Friday, 24 April 2020

CBSE Class 8 - Science - Force, Pressure and Friction (Short Answer Type Questions)(#eduvictors)(#cbseClass8Science)

Force, Pressure and Friction 

(Short Answer Type Questions)
CBSE Class 8 - Science

CBSE Class 8 - Science - Force, Pressure and Friction (Short Answer Type Questions)(#eduvictors)(#cbseClass8Science)

Q1: Why do porters place on their heads a round piece of cloth?

Answer: To reduce pressure.
Round piece of cloth increases contact surface areas, thus reduce the pressure.


Q2: It is convenient to pull the luggage fitted with rollers, why? 

Answer: Because rollers reduce friction. Rolling friction is much less than sliding friction.


Q3: lf we apply a force on a body and the body is still in rest. Is there any frictional force acting on the body? If yes then how?

Answer: Yes. Static friction is acting on it in opposite direction to the applying force. Thus, resultant force is zero.


Q4:  Sliding friction is less than static friction, how? Explain by an example.

Friday, 22 November 2019

CBSE Class 8 - Science - Chapter 18 - Pollution of Air and Water (Worksheet)(#eduvictors)(#class8Science)

Pollution of Air and Water (Worksheet)

CBSE Class 8 - Science - Chapter 18
CBSE Class 8 - Science - Chapter 18 - Pollution of Air and Water (Worksheet)(#eduvictors)(#class8Science)


All organisms including plants, animals (including human beings) and micro-organisms live in a habitat and interact with the ecosystem. Both biotic and abiotic components constitute environment. A harmful change in environment due to pollution cause discomfort and affect the lives of living beings.

Fill in the blanks

1. Substances that cause harmful changes in the air, soil or water are called ___________.


2. Incomplete burning of fossil fuels, like petrol and diesel, results in the production of colourless, odourless and toxic gas called ______________.


3. ________ is a mix, in the air, of smoke and chemicals with fog.


4. CFCs contribute to the depletion of the ________ layer that protects us from the harmful ultraviolet rays of the sun.


Monday, 19 August 2019

CBSE Class 8 Science - Synthetic Fibres and Plastics (Worksheet) (#cbsenotes)(#eduvictors)

Synthetic Fibres and Plastics 

CBSE Class 8 Science 
(Worksheet) 
CBSE Class 8 Science - Synthetic Fibres and Plastics (Worksheet) (#cbsenotes)(#eduvictors)

Fill in the blanks

1. A synthetic fibre consists of numerous ________ joined together to form a large polymer.

2. Cotton is an example of _______ fibre.

3. Plastics are ________ conductors of electricity.

4. __________ soften or melt on heating.

Monday, 29 April 2019

Amazing Human Body - Quick Facts (#humanbody)(#eduvictors)

Amazing Human Body - Quick Facts 

Amazing Human Body - Quick Facts (#humanbody)(#eduvictors)

1.  The hardest bone in the human body is the jawbone.

2.  The number of eye blinks varies greatly from about 29 blinks each minute if you are talking to someone to only 4 blinks each minute if you are reading.

3.  The average human blinks 25 times per minute.

4.  A nail takes around 6 months to grow from base to the tip.

5.  Each second 10,000,000 cells die and are replaced in your body.