CBSE Class 8 - Science - Synthetic Fibres - Know Your Plastic Bottle (#cbseNotes)

Know Your Plastic Bottle

Class 8 - Science - Synthetic Fibres

Resin Coding System (Image Credits: Openclipart)

In 1988, the Plastic Industry Association developed the Resin Identification Codes (1-7), a set of symbols appearing on plastic products that identify the plastic resin out of which the product is made. This help the workers to sort out various plastic bottles in order to recyle or reuse them or not.

Here is a table of resin codes that are used to get information about the application of plastic, its safety and re-usability.

♳ PET/PETE
Polymer: Polythene Terephtalate
Common Applications: Soft Drink, Water and Salad Dressing bottles, peanut butter and jam jars.
Safe for Alimentary Use: Safe One Type Use.
Reusable: No

CBSE Class 8 - Science - CH 16 - Light (MCQ)

Light

MCQs

Laws Of Reflection
credits:wikipedia

Q1: Image formed by the plane mirror is:

(a) Always real
(b) Always virtual
(c) Sometimes real sometimes virtual
(d) None of these

Q2: The light ray, which strikes any surface, is called:

(a) Reflected Ray
(b) Normal
(c) Incident Ray
(d) Refracted Ray

Q3: The ray that comes back from the surface after reflection is called:

(a) Reflected Ray
(b) Normal
(c) Incident Ray
(d) Refracted Ray

Q4: Which of the following statement is correct:

(a) Angle of incidence is never equal to angle of reflection.
(b) Angle of incidence is always greater than angle of reflection.
(c) Angle of incidence is always smaller than angle of reflection.
(d) Angle of incidence is always equal to angle of reflection.

Q5: The property of plane mirror to make 'right appear as left' and vice versa, is called:

CBSE Class 8 Science - CH 14 - Chemical Effects of Electric Current (MCQs)

Chemical Effects of Electric Current

MCQs

Q1: The liquid will conduct electric current in a circuit when the vessel is filled with _________.

(a) distilled water
(b) salt solution
(c) air
(d) helium


Q2: Which of the following substance is not a good conductor of electricity?

(a) copper
(b) aluminium
(c) rubber
(d) mercury


Q3: The decomposition of liquid compound on passing an electric current though it is known as ______

(a) electroplating
(b) electrolysis
(c) magnetic effect
(d) electro-resistivity


Q4: The glowing of filament bulb is due to

CBSE Class 6-12 - Science - Fathers in Biology

℉α⊥нεяṧ ◎ḟ Ⅴαґḯøü﹩ ℬґαηḉℌ℮ṧ їη ℬїøł☺ℊ¥

Fathers of Various Branches in Biology

Aristotle - Father of Biology
credits: wikipedia

Num.	Branch of Biology	Name
1	Father of Biology	Aristotle
2	Father of Zoology	Aristotle
3	Father of Botany	Theophrastus
4	Father of Taxonomy	Carl Linnaeus
5	Father of Plant Physiology	Stephen Hales
6	Father of Bacteriology	Louis Pastuer
7	Father of Microbiology	Leeuwenhoek
8	Father of Immunology	Edward Jenner
9	Father of Cytology	Robert Hooke
10	Father of Mycology	Micheli
11	Father of Genetics	G J Mendel
12	Father of Experimental Genetics	T. H. Morgan
13	Father of Bryology	Johann Hedwig
14	Father of Eugenics	Francis Galton
15	Father of Microscopy	Marcello Malphigi
16	Father of Bio-diversity	E.O. Wilson
17	Father of Medicine	Hippocrates
18	Father of modern Anatomy	Andreas Vesalius
19	Father of Radiation Genetics	H. J. Muller

CBSE Class 8 - Science - Ch 13 - Sound (MCQs)

Sound

MCQs

Q1: In dholak sound is produced due to ...

(a) stretched membrane
(b) stretched strings
(c) air column
(d) vibration of air


Q2:The pitch of sound depends on the __________ of the vibrating body.

(a) amplitude
(b) noise
(c) frequency
(d) medium of propagation


Q3: Speed of sound in solids is ______ the speed of sound in liquids.

(a) same as
(b) greater than
(c) less than
(d) sometimes greater and sometimes less than


Q4: The human ear can hear sounds having frequency in range ...

(a) between 200 - 20,000 Hz
(b) between 20 - 2000 Hz
(c) between 200 - 2000 Hz
(d) between 20 - 20,000 Hz


Q5: The time taken to complete ___ oscillation(s) is called time period.

CBSE Class 8 - Science - Ch 6 - Combustion & Flame (MCQs)

Combustion & Flame

Combustion & Flame
credits:openclipart

(MCQs)

Q1: Which of the following is the chemical process in which a substance reacts with oxygen to give off heat?

(a) Electrolysis
(b) Combustion
(c) Ignition
(d) Friction


Q2: The substance which undergoes combustion is called …

(a) Fuel
(b) Energy
(c) Light
(d) Matter


Q3: Which of the following is not a combustible substance?

(a) Magnesium
(b) Charcoal
(c) Petrol
(d) Glass


Q4: Which of the following has the lowest ignition temperature?

CBSE Class 8 - Science - CH10 - Reaching Age of Adolescence (MCQs)

Reaching Age of Adolescence 

Adolescents

MCQs

Q1: The period of life when the body undergoes changes, leading to reproductive maturity, is called?

(a) Puberty
(b) Adolescence
(c) Metamorphosis
(d) Menarche


Q2: Onset of sexual maturity in individuals, making them capable of reproduction is termed as _________

(a) Adolescence
(b) Metamorphosis
(c) Puberty
(d) Menarche


Q3: The voice box is also known as __________

(a) Allosomes
(b) larynx
(c) Menarche
(d) Thyroid

CBSE Class 8 - Science - CH12 - Friction (MCQs)

Friction

MCQs

Q1:  Which friction of the following is the highest?

(a) Sliding friction.
(b) Rolling friction
(c) Static friction
(d) None of these

Q2:  Friction is a ______.

(a) type of contact force.
(b) type of non-contact force.
(c) type of pressure.
(d) form of heat.



Q3: An object is at rest on a floor, a force is applied to move that object. Which friction force will come into an action at this moment?

(a) Sliding Friction
(b) Static Friction
(c) Rolling Friction
(d) Fluid Friction

CBSE Class 8 Science CH17 - STARS AND THE SOLAR SYSTEM (MCQs)

STARS AND THE SOLAR SYSTEM

MCQs

Planets with as per their sizes
credits:wpclipart

Q1:  The planet having the largest diameter is __________ .

(a) Earth
(b) Jupiter
(c) Venus
(d) Uranus


Q2:  The earth rotates on its axis from ____________.

(a) north to south
(b) south to north
(c) east to west
(d) west to east


Q3:  Name two planets which revolve around their axis from east to west ____________.

(a) Earth and Venus
(b) Mars and Earth
(c) Venus and Uranus
(d) Mars and Uranus

CBSE Class 8 - Science - CH4 - Metals and Non-Metals (MCQs)

Metals and Non-Metals

MCQs

Q1: Whose reactivity is highest among the following metals?

(a) Copper
(b) Potassium
(c) Iron
(d) Zinc


Q2: The metal stored in kerosene due to its high reactivity with air and water is ...

(a) Magnesium
(b) Zinc
(c) Sodium
(d) Calcium


Q3: Materials having the properties of both metals and non metals are called _____.

(a) Metalloids
(b) Noble metals
(c) Alloys
(d) Mixtures

CBSE Class 8 - Science - CH 15 - SOME NATURAL PHENOMENA (MCQs)

SOME NATURAL PHENOMENA

(MCQs)

Lightning over Romania
credits:wpclipart

Q1: Which device is used to protect building from lightning conductor?

(a) Seismograph
(b) Lightning Conductor
(c) Barometer
(d) Thermal Conductor


Q2: Name the scientist who showed that lightning and the spark from your clothes are essentially the same phenomena?

(a) Thomas Alva Edison
(b) Benjamin Franklin
(c) Franklin D. Roosevelt
(d) Isaac Newton


Q3: Two objects with like charges will ...

(a) attract each other
(b) repel each other
(c) either attract or repel
(d) neither attract nor repel

CBSE Class 8 - CH8 - Science - Cell Structure and Functions (MCQs)

Cell Structure and Functions

credits:clker.com

MCQs

Q1: Who discovered cell first time by observing cork?

(a) Alexander Fleming
(b) Robert Hook
(c) Leeuwenhoek
(d) Isaac Newton


Q2: Who is known as father of microbiology?

(a) Alexander Fleming
(b) Robert Hook
(c) Leeuwenhoek
(d) E. Adams


Q3: The structural and function unit of life is called ___.

(a) cell
(b) tissue
(c) organ
(d) organism


Q4: Which of the following cells have irregular shape?

CBSE Class 8 - Science - CH11 - Force and Pressure (MCQs)

Force and Pressure 

(MCQs)

Q1: Opening a door is an example of ._______

(a) Contact force
(b) Non contact force
(c) Spring force
(d) Magnetic force




Q2: What is the cause of change in motion or change in the state of motion?

(a) Pressure
(b) Atmospheric Pressure
(c) Friction
(d) Force


Q3: A charged balloon attaches to a wall because of ______

(a) Muscular force
(b) Electrostatic force
(c) Magnetic force
(d) Gravitational force

CBSE Class 8 - Science - Ch3 - Synthetic Fibres and Fabrics (MCQs)

Synthetic Fibres and Fabrics

Plastics: An Artificial Fibre
image credits:clker.com

MCQs

Q1: The fibres that are obtained from cotton, jute and silk are known as ...

(a) Man made or synthetic fibres
(b) Natural fibres
(c) Artificial fibres
(d) Plastics


Q2: The fibres that are made by human beings are called...

(a) Man-made or synthetic fibres
(b) Natural fibres
(c) Artificial fibres
(d) Plastic


Q3: The natural fibres are made from simple molecule that is known as ...

(a) Polymer
(b) Monomer
(c) Plastics
(d) Cellulose

CBSE Class 8: Science - CH2 : Micro-Organisms - Friend and Foe (MCQs)

Micro-Organisms - Friend and Foe

Microbes: Party in Intestine
credits: openclipart

MCQs

Q1: The process of conversion of sugar into alcohol is known as  ...

(a) Budding
(b) Fusion
(c) Fermentation
(d) Fixation

Q2: What does our body produce to fight the invader when a disease-carrying microbe enters our body?

(a)  Antigens
(b)  Antibodies
(c)  Pathogens
(d)  Antibiotics


Q3: Who discovered Fermentation?

(a)  Edward Jenner
(b)  Alexander Fleming
(c)  Louis Pasteur
(d)  Selman Waksman

CBSE Class 8 - Science - CH1 - Crop Production and Management (MCQs)

Crop Production and Management

MCQs

Q1: The process of loosening and turning the soil is called ______

(a) broadcasting
(b) irrigation
(c) tilling
(d) leveling


Q2: The organic substance obtained from dead plants an animal wastes is _________

(a) Manure
(b) Fertilizer
(c) Irrigation
(d) Agriculture


Q3: Which of the following is not a rabi crop?

(a) Rice
(b) Mustard
(c) Wheat
(d) Barley

NTSE (Science) Quiz-12/Science & Technology Objective Test (Haryana Board)

Science & Technology Objective Test (Haryana Board)/ 

NTSE Sample Quiz-12 (Science) /Class 8 Science

Q1. Atomic number of sodium is 11 and number of neutrons is 12, then atomic mass will be
(a) 12
(b) 22
(c) 11
(d) 23


Q2: Which original particle of atom contains negative charge?
(a) On nucleus
(b) On proton
(c) On neutron
(d) On electron

Class 9 - Unit ObjectiveTest - Science - The Matter in Our Surroundings

Objective Test 

Q1: Fill in the blanks

a. The process of ________ causes cooling.
b. The process of cooling glass is known as ____.
c. Liquids have no fixed ______ but have fixed _____.
d. ____ exists in all three states of matter.
e. Carbon dioxide is a white solid called _____ at temperature below ______.

NTSE / NSO MAT Quiz-11 (SPOT The Odd One)

MAT
QUIZ

In this test the candidate has to figure out the odd or dissimilar option from the asked four choices.

Which one of the following words is different from the rest?
Q1:
(a) Dog  
(b) Horse
(c) Cow
(d) Tiger

Q2:
(a) Cotton
(b) Nylon
(c) Silk
(d) Wool