CBSE > Class 10 > Science | CBSE Board | Homework Help

Metals have the tendency to lose electrons. Similarly hydrogen loses it electrons to form H+ions and become electropositive in nature.Thats why is placed in reactivity series of metal.

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Why is angle of incidence always equal to the angle of reflection ??

Posted by Deepesh Roy 5 years, 6 months ago

CBSE > Class 10 > Science

3 answers

Anushka ?? 5 years, 6 months ago

It is a rule

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Manya Mahajan 5 years, 6 months ago

Because its law and moreover these two rays always when fall form same angle . OK?

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Tanisha ?? 5 years, 6 months ago

It's a law

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Difference between isobar and isotopes ( Anushka negi)

Posted by Bad? Boy 5 years, 6 months ago

CBSE > Class 10 > Science

3 answers

Yogita Ingle 5 years, 6 months ago

Isobars	Isotopes
Chemicals elements which have the same mass	Different atomic structure of the same element
The atomic masses are equal	The atomic masses are different
Often the physical properties are similar	Usually, physical properties are different
Atomic numbers are different	Atomic numbers are the same
Chemical elements are different	same chemical elements but in different forms

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Saurabh Tripathi 5 years, 6 months ago

Hi did it helped u

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Saurabh Tripathi 5 years, 6 months ago

In isobars Atomic mass is same and in isotopes Atomic No. is same Hope this will help u ?

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Define the unit of Power?

Posted by Bad? Boy 5 years, 6 months ago

CBSE > Class 10 > Science

5 answers

Anu Kumari 5 years, 6 months ago

The SI unit of power is watt

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Ishika ? 5 years, 6 months ago

Watt

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Ak Thakur 5 years, 6 months ago

The SI unit of power is watt (w)

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Yogita Ingle 5 years, 6 months ago

Power as the rate of doing work, it is the work done in unit time. The SI unit of power is Watt (W) which is joules per second (J/s). Sometimes the power of motor vehicles and other machines are given in terms of Horsepower (hp), which is approximately equal to 745.7 watts.

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Bhagya Sudarsan 5 years, 6 months ago

Pascal

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How many joule in 1kwh

Posted by Bad? Boy 5 years, 6 months ago

CBSE > Class 10 > Science

3 answers

Parul Ailawadi 5 years, 6 months ago

3.6×10^6J

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Anish Sharma 5 years, 6 months ago

3.6*10power -11

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Yogita Ingle 5 years, 6 months ago

1 KW-h can be defined as the amount of energy produced, when work is done at an average rate of one thousand watts for one hour.
Kilowatt hour(KW-h ) is a unit of energy.
Now,
We know 1 kW = 1000 watts and 1 watt = 1 Joule/sec
1 kW- h =1000 watts × 1 hour

<div>= 1000 × Joule/sec × 60 × 60 sec
= 36, 00, 000 Joules</div>

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Define the electric energy with SI unit.

Posted by Bad? Boy 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 6 months ago

Electrical energy is the energy derived from electric potential energy or kinetic energy of the charged particles. In general, it is referred to as the energy that has been converted from electric potential energy.
The basic unit of electrical energy is the joule or watt-second. An electrical energy is said to be one joule when one ampere of current flows through the circuit for a second when the potential difference of one volt is applied across it. The commercial unit of electrical energy is the kilowatt-hour (kWh) which is also knwon as the Board of trade unit (B.O.T).
1 kwh = 1000 × 60 × 60 watt – second
1 kwh = 36 × 10⁵ Ws or Joules
Generally, one kwh is called one unit.

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Which species is likely to have better chance of survival -the one reproducing asexually and one reproducing sexually? Justify your Answer.

Posted by Atulendra Mishra 5 years, 6 months ago

CBSE > Class 10 > Science

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What type.of condition does the fermentation need like the grapes ? Aerobuc or anaerobic explain broadly.

Posted by Nikhil Yadav 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Meghna Thapar 5 years, 6 months ago

Fermentation normally occurs in an anaerobic environment. In the presence of O2, NADH, and pyruvate are used to generate ATP in respiration. This is called oxidative phosphorylation, and it generates much more ATP than glycolysis alone. For that reason, fermentation is rarely utilized when oxygen is available. Fermentation is a metabolic process in which an organism converts a carbohydrate, such as starch or a sugar, into an alcohol or an acid. For example, yeast performs fermentation to obtain energy by converting sugar into alcohol. Bacteria perform fermentation, converting carbohydrates into lactic acid.

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What is AIDS? Which microbe is responsible for AIDS infection? State one mode of transmission of this disease? Explain in brief one measure for the prevention of AIDS?

Posted by Atulendra Mishra 5 years, 6 months ago

CBSE > Class 10 > Science

3 answers

Anu Kumari 5 years, 6 months ago

The full form of AIDS is acquired immune deficiency syndrome. And virus is responsible for the AIDS infection. Transmission of this disease by sexual intercourse.

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Insha Fatima 5 years, 6 months ago

AIDS or acquired immuno deficiency syndrome is a disease in which the immune power of a person gets decreased to a very low level. HIV ( Human immuno deficiency virus ) is responsible for the infection of AIDS It can be transmitted physically through unaided sexual intercourse. We should avoid sexual relation with the infected person to prevent the spread.

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Saurabh Tripathi 5 years, 6 months ago

AIDS is a disease which is caused by the HIV virus Physical touch is one of the transmission of this disease Do not be physical with the infected person

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Part of brain with their functions

Posted by Tanisha Chhikara 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 6 months ago

The brain is made of three main parts: the forebrain, midbrain, and hindbrain. The forebrain consists of the cerebrum, thalamus, and hypothalamus . The midbrain consists of the tectum and tegmentum. The hindbrain is made of the cerebellum, pons and medulla.
Cerebrum: The cerebrum is the largest part of the human brain, associated with higher brain function such as thought and action. The cerebral cortex is divided into four sections, called "lobes": the frontal lobe, parietal lobe, occipital lobe, and temporal lobe.

Frontal Lobe- associated with reasoning, planning, parts of speech, movement, emotions, and problem solving
Parietal Lobe- associated with movement, orientation, recognition, perception of stimuli
Occipital Lobe- associated with visual processing
Temporal Lobe- associated with perception and recognition of auditory stimuli, memory, and speech

Thalamus-It is a large mass of gray matter deeply situated in the forebrain at the topmost portion of the diencephalon. The structure has sensory and motor functions. Almost all sensory information enters this structure where neurons send that information to the overlying cortex.

Hypothalamus-It is a part of the diencephalon, ventral to the thalamus. The structure is involved in functions including homeostasis, emotion, thirst, hunger, circadian rhythms, and control of the autonomic nervous system. It also controls the pituitary.

Midbrain- It is involved in functions such as vision, hearing, eyemovement, and body movement.
Cerebellum - The cerebellum has two hemispheres and has a highly folded surface or cortex. This structure is associated with regulation and coordination of movement, posture, and balance.

Pons- It is involved in motor control and sensory analysis. It has parts that are important for the level of consciousness and for sleep.

Medulla Oblongata- This structure is present between the pons and spinal cord. It is responsible for maintaining vital body functions, such as breathing and heartrate.

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Define following terms (matel)

Posted by Malhi Saab 5 years, 6 months ago

CBSE > Class 10 > Science

2 answers

Nikhil Yadav 5 years, 6 months ago

Properties that decide the metal. 1-Shiny appearance. 2- Lustrous 3-Melleable 4- Ductile 5-Generally solid, liquid or gas at room temperature. 6-Generally have high density. 7-They are sonorous i.e. abipity to produce sound when struck by hard object. 8-They are generally grey in colours. Please note that the above explained property is physical property . When you read further you would also read chemical property.

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Ashnoor Kamboj 5 years, 6 months ago

type of solid substance that is usually hard and shiny and that heat and electricity can travel through विद्युत तथा ताप का अवशोषक कठोर चमकीला ठोस पदार्थ, धातु

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Can i get PDF of laskhay book series

Posted by Ryan Goyal 5 years, 6 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

എന്താണ് ഭൗതിക ശാസ്ത്രം?

Posted by Lino K Philip 5 years, 6 months ago

CBSE > Class 10 > Science

3 answers

Saurabh Tripathi 5 years, 6 months ago

?????????? Bahi hindi me do

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Ishika ? 5 years, 6 months ago

Not able to understand you....??

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The Innocent Boy ?? 5 years, 6 months ago

Bhai hindi likh le

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when iron nail are kept in the solution of copper sulphate the colour of solution changes in

Posted by Aditya Vavhal 5 years, 6 months ago

CBSE > Class 10 > Science

2 answers

Divya Banjara 5 years, 6 months ago

The blue colour of copper sulphate fades, and the nail becomes brown

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Shubham Thakur 5 years, 6 months ago

this because a layer of copper gets deposited over the surface of the iron nail . Iron is more reactive than copper so,it displaces copper form solution of cpper sulphate and the colour changes from blue to green due to formation of iron sulphate

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What do you understood by balance equation

Posted by Raghav Agarwal 5 years, 6 months ago

CBSE > Class 10 > Science

5 answers

Ishika ? 5 years, 6 months ago

An equation having an equal number of atoms of each element on both the sides (left & right) is called a Balanced equation.☺️☺️☺️☺️

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Divya Banjara 5 years, 6 months ago

Reactant = product

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Shubham Thakur 5 years, 6 months ago

Balance equation the right side equal to left side RHS=LHS

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Aryan Kumar 5 years, 6 months ago

RHS=LHS SIDE EQUATIONS ARE EQUAL

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Anushka ?? 5 years, 6 months ago

Both left and right side equation are equal

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How many plant harmones are there and explain them

Posted by Anushka ?? 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Shubham Thakur 5 years, 6 months ago

there are five gerneral classes of harmons . 1. auxins 2.cytokinins 3.gibberellins 4.ethylene 5. abscisic acid

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What do you mean by Aldehyde

Posted by Anushka ?? 5 years, 6 months ago

CBSE > Class 10 > Science

2 answers

Bad? Boy 5 years, 6 months ago

an organic compound containing the group —CHO, formed by the oxidation of alcohols.(Hi babes)

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Shubham Thakur 5 years, 6 months ago

An organic compound contain the group CHO formed by the oxidation of alchols . typical aldehydes include methanal (formal dehyde) and ethanal (acetaldehyde )

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How does nervous tissue cause action

Posted by Basu Jitti 5 years, 6 months ago

CBSE > Class 10 > Science

2 answers

Shubham Thakur 5 years, 6 months ago

It stimulates muscle contraction creats an awreness of the environment ,and plays a major role in emotio ,memory ,and recasoning to do all these things ,cell in nervous tissue need to be able to communicate with each other by way of electrical nerve impulse

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Yogita Ingle 5 years, 6 months ago

Nervous tissue is the main component of the nervous system, which regulates and controls body functions. It is specialised to react to stimuli and to conduct impulses to various organs in the body which bring about a response to the stimulus.

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What is the function of salivary glads and what are these glad located in body

Posted by Biswajit Gudu 5 years, 6 months ago

CBSE > Class 10 > Science

2 answers

Shubham Thakur 5 years, 6 months ago

salivary glands -it produced saliva .which kept mouth and other parts of the digestive system moist . it also help break down carbohydrates and lubricates the passage of food down from the oro-pharynx to the esophagus to the stomach

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Yogita Ingle 5 years, 6 months ago

In all mammals, the salivary glands functions as an exocrine gland, which produces saliva through a system of ducts. Among all other mammals, humans have hundreds of salivary glands and are present within the mouth. The basic secretion units of salivary glands are called acini and are composed of clusters of cells.

Salivary Glands are composed of two types of secretory cells:

Serous cells– These cells are present on the surface of epithelium, submucosal glands and secretes an enzyme solution.
Mucous cells– These cells are present inside the stomach, in the necks of the gastric pits and produces mucus.

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define ohm's law and find the units of physical quantities given below,a.current,b.resistance,c.potential,d.voltage,e.potential difference,f.work done,g.power,h.energy,i.temperature,j.charge .

Posted by Ak18 Ak18 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 6 months ago

Ohm’s Law states that the current flowing through a conductor is directly proportional to the potential difference applied across its ends, provided the temperature and other physical conditions remain unchanged. Mathematically it can be represented as,

<center>Potential difference ∝ Current</center> <center>V ∝ I</center>

( When the value of V increases the value of I increases simultaneously)

Where,

V is Voltage in volts (V)
R is Resistance in ohm (Ω)
I is Current in Ampere (A)

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Why is diffusion insufficient to meet the oxygen requirements of multicellular organisms like human?

Posted by Jigyashu Jatav 5 years, 6 months ago

CBSE > Class 10 > Science

3 answers

Tanisha Chhikara 5 years, 6 months ago

Because it is a very slow process and it may take minimum 3 years to travel through the whole body

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Kritika Dhiman 5 years, 6 months ago

Because diffusion is very slow and if our body would get oxygen through diffusion it would take 3 years to reach oxygen to our foot from lungs

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B.Aishwarya 203 Kalyannagar 5 years, 6 months ago

Diffusion is a very slow process and it takes time to reach all the cells

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What is meant by reproduction

Posted by Mallidi Eshwar Reddy 5 years, 6 months ago

CBSE > Class 10 > Science

2 answers

Ishika ? 5 years, 6 months ago

Reproduction is a unique biological process that is essential for the continuity of species.

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Sandip Prajapati 5 years, 6 months ago

To produce again and again

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Structure of atom total lesson

Posted by Siva Siva 5 years, 6 months ago

CBSE > Class 10 > Science

0 answers

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What do you know about plaster of paris ?

Posted by Navneet Bhardwaj 5 years, 6 months ago

CBSE > Class 10 > Science

1 answers

Yogita Ingle 5 years, 6 months ago

Plaster of paris is a compound prepared from gypsum salt

When gypsum salt is heated at 373 K or 100°C plaster of paris is formed

CaSO₄ . 2H₂O ⇒CaSO₄ . ¹/₂ H₂O + 1 ¹/₂ H₂O at 100°C

plaster of paris chemical name is calcium sulphate hemihydrate

it is used in plastering the broken bones

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2.1.4 of class 10

Posted by Hezal Satramani 5 years, 6 months ago

CBSE > Class 10 > Science

0 answers

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Important reactions in carbon and its compounds

Posted by Gitesh Hulsar 5 years, 6 months ago

CBSE > Class 10 > Science

0 answers

ANSWER

What will happen if we intake iodine in our balance diet is low?

Posted by Hariom Verma 5 years, 6 months ago

CBSE > Class 10 > Science

2 answers

Tanisha Chhikara 5 years, 6 months ago

We may suffer from goiter

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Yogita Ingle 5 years, 6 months ago

If the intake of iodine is low the following things may happen:
(a) Since, iodine is requires for the release of thyroxin from thyroid gland, less iodine will result in less thyroxine, thus affecting carbohydrate and fat metabolism.
(b) A person might suffer from goitre because of lack of thyroxine.

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ANSWER

Different between exothermic and endothermic reactions

Posted by The Innocent Boy ?? 5 years, 6 months ago

CBSE > Class 10 > Science

3 answers

Tanisha Chhikara 5 years, 6 months ago

Exothermic reaction:- heat is realised Endothermic reaction:- heat is provided by us

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Yogita Ingle 5 years, 6 months ago

Endothermic Reaction	Exothermic Reaction
A reaction that the system absorbs energy from its surrounding in the form of heat.	A reaction that releases energy from the system in the form of heat.
The energy is absorbed from the surround into the reaction	The energy is released from the system to its environment.
Energy in the form of heat	Energy is released as heat, electricity, light or sound.
Melting ice, evaporation, cooking, gas molecules, photosynthesis are few examples	Rusting iron, settling, chemical bonds, explosions, nuclear fission are a few examples.