Ask questions which are clear, concise and easy to understand.
Ask QuestionPosted by Tamanna Pant 3 years, 9 months ago
- 1 answers
Posted by Ssd Gh 3 years, 9 months ago
- 2 answers
Kripa Daga 3 years, 9 months ago
Yogita Ingle 3 years, 9 months ago
Total number of outcomes when three dice are thrown = 6 x 6 x 6 = 216
For sum of numbers to be 17, possible ways are, (6, 6, 5), (6, 5,6), (5, 6,6),
.'. Number of favorable outcomes = 3
.'. Required probability = 3/216 = 1/72
Posted by Bubbly Cs 3 years, 9 months ago
- 5 answers
Yogita Ingle 3 years, 9 months ago
Inertia can be defined as any physical object with resistance of its change, and state of its motion.
It is also concerned with the change in its velocity, and continues to maintain its velocity.
The physical quantity that measures Inertia is known as mass.
The S.I. unit of inertia is kg.
Posted by Divya Kumari 3 years, 9 months ago
- 1 answers
Gaurav Seth 3 years, 9 months ago
Law of Chemical Combination
(1) Law of Conservation of Mass
In a chemical change, total mass remains conserved. i.e. mass before the reaction is equal to mass after the reaction
H2(g)+Cl2(g)⟶2HCl
Mass before reaction=2+71=73g
Mass after reaction=2x36.5=73g
(2) Law of constant or Definite Proportions
All Chemical compounds are found to have constant composition irrespective of their method of preparation or source.
For g. in water (H2O), hydrogen and oxygen combine in 2:1 molar ratio, this ratio remains constant whether it is tap water or river water.
(3) Law of Multiple Proportions
When one element combines with the other elements to form two or more different compounds, the mass of one element which combines with a constant mass of the other, bear a simple ratio to one another.
For eg. C and O2 reacts together to form CO and CO2. Here, fixed mass of carbon (12g) reacting with different masses of oxygen (16g and 32g) . Therefore, ratio of the masses of oxygen has ratio 16:32 or 1:2
Posted by Divya Kumari 3 years, 9 months ago
- 0 answers
Posted by Divya Kumari 3 years, 9 months ago
- 3 answers
Posted by Khushali Sheth 3 years, 9 months ago
- 1 answers
Yogita Ingle 3 years, 9 months ago
| Healthy |
Disease Free |
|
A state of complete physical, mental and social well being |
State of the absence of discomfort in any part of the body |
|
It depends upon the individual as well as on social and environmental factors |
It depends on the individual only |
| A healthy person will be disease-free |
A disease-free person may or may not be healthy |
| A healthy person is energetic and is able to perform as per the requirement |
The performance of a disease-free person depends upon the environment and personal attitude |
Posted by Brindha Kolakalan 3 years, 9 months ago
- 4 answers
Mukesh Kumar 3 years, 9 months ago
Gaurav Seth 3 years, 9 months ago
A force is set to be 1 Newton if it produce and excel ration of 1m/sec on a body of 1kg
1N= 1kg m/sec sq
or
One newton is defined as the force that is required to accelerate a mass of 1kg by 1m.s-2 in the direction of applied force. It is the SI unit of force.
Posted by Utkarsh Dhiman 3 years, 9 months ago
- 1 answers
Gaurav Seth 3 years, 9 months ago
CBSE Class 9 Science (086) - Deleted portion (Theory):
|
Unit I: Matter-Nature and Behaviour |
|
|
Chapter |
Topics |
|
Matter in Our Surroundings |
Definition of matter; solid, liquid and gas; characteristics - shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation. |
|
Unit II: Organization in the Living World |
|
|
Chapter |
Topics |
|
Diversity in Living Organisms |
Diversity of plants and animals-basic issues in scientific naming, basis of classification. Hierarchy of categories / groups, Major groups of plants (salient features) (Bacteria, Thallophyta, Bryophyta, Pteridophyta, Gymnosperms and Angiosperms). Major groups of animals (salient features) (Non-chordates upto phyla and chordates upto classes). |
|
Unit III: Motion, Force and Work |
|
|
Chapter |
Topics |
|
Floatation |
Thrust and Pressure. Archimedes’ Principle; Buoyancy; Elementary idea of Relative Density. |
|
Sound |
Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo and SONAR. Structure of the Human Ear (Auditory aspect only). |
|
Unit V: Food Production |
|
|
Chapter |
Topics |
|
Improvement in Food Resources |
Plant and animal breeding and selection for quality improvement and management; Use of fertilizers and manures; Protection from pests and diseases; Organic farming. |
DELETED PRACTICALS
- Separation of the components of a mixture of sand, common salt and ammonium chloride (or camphor).
- Determination of the melting point of ice and the boiling point of water.
- Verification of the Laws of reflection of sound.
- Determination of the speed of a pulse propagated through a stretched string/slinky (helical spring).
- Study of the characteristics of Spirogyra, Agaricus, Moss, Fern, Pinus (either with male or female cone) and an Angiospermic plant. Draw and give two identifying features of the groups they belong to.
- Observe the given pictures/charts/models of earthworm, cockroach, bony fish and bird. For each organism, draw their picture and record:
- a) one specific feature of its phylum.
- b) one adaptive feature with reference to its habitat.
- Study of the external features of root, stem, leaf and flower of monocot and dicot plants.
Internal Assessment
Theme: Natural Resources: Balance in nature
Unit IV: Our Environment
Physical resources: Air, Water, Soil. Air for respiration, for combustion, for moderating temperatures; movements of air and its role in bringing rains across India. Air, water and soil pollution (brief introduction). Holes in ozone layer and the probable damages.
Bio-geo chemical cycles in nature: Water, Oxygen, Carbon and Nitrogen.
Posted by Keerthana T Keerthana T 3 years, 9 months ago
- 2 answers
Yogita Ingle 3 years, 9 months ago
- By calculating the mass by volume percentage of the solution, its concentration can be depicted.
- To calculate the mass by volume percentage of the given solution, the following calculation must be done:
Mass by volume percentage =
Mass by volume percentage =
Mass by volume percentage =
Mass by volume percentage =
Mass by volume percentage = 2
Posted by Vanshika Saxena 3 years, 9 months ago
- 1 answers
Yogita Ingle 3 years, 9 months ago
| Basis of Comparison | Signs | Symptoms |
| Meaning | It is evidence of disease that means it is observed by others. | It is evidence of diseases which only a person can feel. |
| Nature | Objective | Subjective |
| Observation Method | Visible and observable by health care professionals | Experienced by the sufferer or patients who experiences symptoms |
| How to Check | Can measure by checking temperature, taking X-ray, monitoring pulse rate, blood test and more. | Cannot be measured as the person only feels them. |
| Types | Three types: Anamnestic signs Prognostic signs Diagnostic signs |
Three types: Chronic symptoms Relapsing symptoms Remitting symptoms |
| Example | Cancer, AIDS, Asthma, Tuberculosis which health care professionals can specifically diagnose | Body pain, headache, itching, nausea, felt by the sufferer or patient only. |
| Visibility | Visible | Vague |
Posted by Vikashini M 3 years, 9 months ago
- 1 answers
Yogita Ingle 3 years, 9 months ago
ATP stands for Adenosine triphosphate, an organic molecule responsible for driving nearly all cellular mechanisms and processes in living organisms.
Posted by Arnab Roy 3 years, 9 months ago
- 1 answers
Sayantani Sen 3 years, 9 months ago
Posted by Ahir Subodh 3 years, 9 months ago
- 1 answers
Gaurav Seth 3 years, 9 months ago
Types of Colloids
| Name of Colloid | Dispersed Phase | Dispersed Medium | Example |
| 1) Sol | Solid | Liquid | Ink, Soap Solution,Paints |
| 2) Solid Sol | Solid | Solid | Coloured Gemstones |
| 3) Aerosol | a)Solid
b)Liquid |
Gas
Gas |
Smoke,
Automobile exhaust Fog,Mist,Cloud |
| 4) Emulsions | Liquid | Liquid | Milk,Butter,
Cream |
| 5) Foam | Gas | Liquid | Shaving Cream,Soap Bubbles |
| 6) Solid Foam | Gas | Solid | Insulating Foam,Foam Rubber,sponge |
| 7) Gel | Solid | Liquid | Jellies,Gelatin |
Posted by Megha Thakur 3 years, 9 months ago
- 1 answers
Yogita Ingle 3 years, 9 months ago
Functions of SER
- Synthesises glycogen, lipids and steroids.
- It helps in the formation of spherosomes/ Oleosomes.
- Provides vesicles for cis-face of Golgi apparatus.
Posted by Satyam Singh Rajput 3 years, 9 months ago
- 2 answers
Ragini Kumari 3 years, 9 months ago
Yogita Ingle 3 years, 9 months ago
The path of a projectile is called its trajectory. The trajectory of a projectile in free fall is a parabola.
Posted by Ritik Rathore 3 years, 9 months ago
- 3 answers
Yogita Ingle 3 years, 9 months ago
| Physical Change | Chemical Change |
| When a substance undergoes a physical change, its composition remains the same despite its molecules being rearranged. | When a substance undergoes a chemical change, its molecular composition is changed entirely. Thus, chemical changes involve the formation of new substances. |
| Physical change is a temporary change. | A chemical change is a permanent change. |
| A Physical change affects only physical properties i.e. shape, size, etc. | Chemical change both physical and chemical properties of the substance including its composition |
| A physical change involves very little to no absorption of energy. | During a chemical reaction, absorption and evolution of energy take place. |
| Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. | A few examples of chemical change are digestion of food, burning of coal, rusting, etc. |
| Generally, physical changes do not involve the production of energy. | Chemical changes usually involve the production of energy (which can be in the form of |
Gaurav Seth 3 years, 9 months ago
1 - अगर शब्द किसी व्यक्ति, वस्तु, प्राणी, पक्षी, भाव, जाति आदि के बारे में बताता है, तो वह शब्द संज्ञा है।
2 - अगर शब्द किसी संज्ञा के स्थान पर शब्द का प्रयोग जैसे मेरा, मै, तुम, आपका, उस, वह आदि शब्द है, तो वह शब्द सर्वनाम है।
3 - अगर शब्द किसी वस्तु, स्थान, पशु, पक्षी आदि की विशेषता बताता है, अर्थात वह कैसा है - लंबा है, सुंदर है, डरावना है आदि, तो वह शब्द विशेषण है।
4 - अगर शब्द वाक्य में जो क्रिया है उसकी विशेषता बताता है, तो वह क्रिया विशेषण है। जैसे कि - क्रिया कब हो रही है (कल, अभी, दिनभर), क्रिया कैसे हो रही है (चुपचाप, अवश्य, तेजी से), क्रिया कहाँ हो रही है (अंदर, ऊपर, आसपास), क्रिया कितनी मात्रा में हो रही है (कम, पर्याप्त, ज्यादा)
5 - अगर शब्द किसी दो या अधिक संज्ञा और सर्वनाम के बीच का संबंध दर्शाता है, तो वह संबंधबोधक अव्यय है।
जैसे - के पास, के ऊपर, से दूर, के कारण, के लिए, की ओर।
6 - अगर शब्द किसी दो वाक्यों के बीच का संबंध दर्शाता है, तो वह समुच्चयबोधक अव्यय है।
जैसे - और, अतएव, इसलिए, लेकिन।
7 - अगर शब्द किसी विस्मय, हर्ष, घृणा, दुःख, पीड़ा आदि भावों को प्रकट करते है, तो वह विस्मयादिबोधक अव्यय है।
जैसे - अरे!, वाह!, अच्छा! आदि।
8 - अगर शब्द किसी बात पर ज्यादा भार दर्शाता है, तो वह निपात है।
जैसे - भी, तो, तक, केवल, ही।
उदाहरण के लिए कुछ वाक्य निचे दिए जा रहे हैं, जिनमें कुछ शब्द रेखांकित किए गए हैं। आपको इन रेखांकित पदों के पद परिचय दिया गया है।
1) आज समाज में विभीषणों की कमी नहीं है।
विभीषणों (देशद्रोहियों) – संज्ञा (जातिवाचक), बहुवचन, पुल्लिंग, संबंध कारक (कारक ‘की)
2) रात में देर तक बारिश होती रहीं।
देर तक - क्रिया-विशेषण (कालवाचक)
3) हर्षिता निबंध लिख रही है।
लिख रही है - क्रिया (संयुक्त), स्त्रीलिंग, एकवचन, धातु ‘लिख’, वर्तमान काल, क्रिया का कर्ता ‘हर्षिता’, क्रिया का कर्म ‘निबंध’
4) इस पुस्तक में अनेक चित्र है ।
अनेक - विशेषण (अनिश्चित संख्यावाचक), बहुवचन, पुल्लिंग, विशेष्य ‘चित्र ‘
5) गांधीजी आजीवन मानवता की सेवा करते रहे ।
आजीवन - क्रिया-विशेषण (कालवाचक)
Posted by Kartik Kumar 3 years, 9 months ago
- 4 answers
Gaurav Seth 3 years, 9 months ago
One mole of any element contains 6.022 X 1023 atoms of the element. Thus 1 mole of He atom consists of 6.022 X 1023 atoms of He. Thus
6.022 X 1023 atoms of He = 1 mole of He atom
1 atom of He = 1 / ( 6.022 X 1023) moles of He
So 12.044 X 1023 atoms of He = ( 1 X 12.044 X 1023) / ( 6.022 X 1023) moles of He
= 2 moles of He atom
Thus there are 2 moles of He atom in 12.044 X 1023 atoms of He.
Posted by Yakshi Deswal 3 years, 9 months ago
- 1 answers
Gaurav Seth 3 years, 9 months ago
Protons and neutrons reside in the nucleus of an atom and are thus called nucleons. Since mass of an atom is due to protons and neutrons only, nucleons give the mass of atom. This is also called mass number.
Posted by Rambha Mishra 3 years, 9 months ago
- 4 answers
Muskan Singh 3 years, 9 months ago
Yogita Ingle 3 years, 9 months ago
Parenchyma is a type of simple permanent tissue that makes a major part of ground tissues in plants, where other tissues like vascular tissues are embedded. They are non-vascular and composed of simple, living and undifferentiated cells, which are modified to perform various functions. The other simple permanent tissues are:
- Collenchyma
- Sclerenchyma
Posted by Akansha Choudhary 3 years, 9 months ago
- 3 answers
Posted by Khushi Gupta 3 years, 9 months ago
- 1 answers
Gaurav Seth 3 years, 9 months ago
We are given that a bullet of mass 10 g moving with a velocity of 400 m/s gets embedded in a freely suspended wooden block of mass 900 g.
Let the final velocity acquired by the block be 'v m/s'.
The mass of the bullet = = 10 g =
= 0.01 kg
The mass of the wooden block = = 900 g =
= 0.9 kg
Also, the initial velocity of the bullet is given by = = 400 m/s
and the initial velocity of the wooden block is given by = = 0 m/s
Now, the momentum conservation of law states that;
Momentum before collision = Momentum after collision
=
= = 4.4
So, v = 4.4 m/s which means this is the velocity acquired by the block.
Posted by K Vikas Kashyap 3 years, 9 months ago
- 0 answers
Posted by Sharad Verma 3 years, 9 months ago
- 2 answers
Divya Khola 3 years, 9 months ago
Posted by Sharad Verma 3 years, 9 months ago
- 5 answers
Rajesh Shah 3 years, 9 months ago
Sanjay Kumar 3 years, 9 months ago
Jasleen Chhabra 3 years, 9 months ago
Kaarunya Sai 3 years, 9 months ago
Posted by Aakriti Rustagi 3 years, 9 months ago
- 1 answers
Arnab Roy 3 years, 9 months ago
Posted by Jashandeep Kaur 3 years, 9 months ago
- 0 answers
Posted by Mehak Soni 3 years, 9 months ago
- 5 answers
Posted by Divya Mishra 3 years, 9 months ago
- 2 answers
Yogita Ingle 3 years, 9 months ago
54*5/18=15m/s
v2-u2 =2as
152-252=2*a*20
225-625=2a*20
2a=400/20
2a=20
a=20/2
a=10m/s2
v=u+at
15=25-10t
10t=25-15
t=10/10
t=1s
Posted by Jolie Mehra 3 years, 9 months ago
- 1 answers
Yogita Ingle 3 years, 9 months ago
54*5/18=15m/s
v2-u2 =2as
152-252=2*a*20
225-625=2a*20
2a=400/20
2a=20
a=20/2
a=10m/s2
v=u+at
15=25-10t
10t=25-15
t=10/10
t=1s
myCBSEguide
Trusted by 1 Crore+ Students
Test Generator
Create papers online. It's FREE.
CUET Mock Tests
75,000+ questions to practice only on myCBSEguide app
Yogita Ingle 3 years, 9 months ago
3Thank You