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Thompson model

_______________

In cathode ray experiment J.J. Thompson purposed that:-

i.An atom consist of a positively charged sphere and the electrons are embedded in it.

ii.The negetive and positive changes are present in equal amounts.So as to COUNTERBALANCE each other.

Rutherford model

_______________

i. There is a positively charged center in an atom called the nucleus.Nearly all the mass of the atom is consentrated in the nucleus.

ii. The electrons revolve around the nucleus in circular orbior path.

iii. The size of the nucleus is very small as compared with the size of an atom.

Bohrs Model

___________

i. Only discret orbits of electrons are allowed inside the atom.

ii. While revolving in DISCREET orbit the electrons donot radiate energy.

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ANSWER:

1. a
2. c
3. b
4. c..................

The MAIN cause of water pollution in the Ganga river are the increase in the population density, various human ACTIVITIES such as bathing, washing CLOTHES, the bathing of animals, and DUMPING of various harmful industrial WASTE into the rivers.

ANSWER:

VITAMIN c

Explanation:

causes SCURVEY DISEASE

Answer:

Thermoset, or thermosetting, plastics are synthetic materials that STRENGTHEN during being heated, but cannot be successfully remolded or reheated after their initial heat-forming. This is in contrast to thermoplastics, which soften when heated and harden and strengthen after cooling. Thermoplastics can be heated, shaped and cooled as often as necessary without causing a chemical change, while thermosetting plastics will burn when heated after the initial molding. Additionally, thermoplastics tend to be easier to MOLD than thermosetting plastics, which also take a longer time to produce (due to the time it takes to cure the heated material).

Thermosetting plastics, however, have a number of advantages. Unlike thermoplastics, they retain their strength and shape even when heated. This makes thermosetting plastics well-suited to the production of permanent components and large, solid shapes. Additionally, these components have excellent strength attributes (although they are brittle), and will not become weaker when the temperature increases. 

DISADVANTAGES It is a compound that is indestructible, even when it is melted the compound gas that is gives off is very harmful to our heath and environment; it weakens the ozone layer. Most plastic is produced from oil. The world is gradually running out of oil. Scientists are now developing plastics that are made from vegetable oil and other organic matter. This means that the plastic is more likely to be degradable, so it will be less of a problem in future. Threatening Disadvantage Another disadvantage is pollution. Plastic accumulation in the environment is a looming catastrophe! Think about this: Plastics are manufactured from PETROLEUM. This brings a host of issues (destruction of habitat, extraction of crude oil, security issues from the volatile countries where oil is produced, processing of petroleum, chemical manipulation into various types of plastics). The manufacture involves many chemicals, many of which have not been sufficiently tested for their toxicological impact on humans or animals. The final plastic product is often a chemical entity that in and of itself has had insufficient toxicological and ecotoxicological TESTING. An example would be PVC, forms of which are banned in Europe but exist widely in children's toys in America. Recent controversies over plastic bottles (many toxicologists recommending not re-using plastic water bottles and not storing food in Tupperware) have highlighted the potential risks.

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ANSWER:

WAY of permanently getting rid of hairs on the body by using an electric CURRENT

Explanation:

a way of separating a liquid into its DIFFERENT chemical parts by PASSING an electric current through it

Answer:

Sundews are “flypaper” PLANTS that trap prey in sticky hairs on their leaves. They make up one of the LARGEST GROUPS of carnivorous plants. Long tentacles protrude from their leaves, each with a sticky gland at the tip. ... Once an insect BECOMES stuck, nearby tentacles COIL around the insect and smother it.

...m.

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Answer:

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Leaves of BANANAS are BIG and light green in colour, whereas leaves of MANGOES are small and DARK green in colour. Bananas are herbs whereas mangoes are trees. Leaves of both bananas and mangoes are used for decoration at the times of rituals and for RELIGIOUS purposes. Similarities:they both are green in colour .

ANSWER:

HEY MATE ,here is your ans.

Explanation:

1.ductility

2.graphite

3.basic

4.ferrous oxide

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Answer:

According to the 5 R's, four actions should be taken, if possible, prior to 'recycling': refuse, reduce, reuse, repurpose, and then recycle. Incorporating this methodology into your business' waste reduction and recycling efforts will minimize LANDFILL waste and help TAKE your recycling PROGRAM to the next level.

Answer:

Synthetic Fibre: Fibres which areman-made are called synthetic fibres, e.g. NYLON, acrylic, ETC. Asynthetic fibre is made of multiple units of a CHEMICAL substance. The units in a fibre are joined TOGETHER like a chain. ... Polymer: A chain of a PARTICULAR chemical substance is called a polymer.

Answer:

If the bottle is of plastic then the hot WATER will be fall down If the bottle is not of plastic so the water will not fall

Explanation:

So plastic ball can YEAR and some other bottle can't HAPPEN any thing

Answer:

Signs and symptoms of PROTEIN DEFICIENCY

Skin, hair and nail problems. Protein deficiency may leave its mark on the skin, hair and nails, all of which are LARGELY made of protein. ...

LOSS of muscle mass. ...

Increased risk of bone fractures.

ANSWER:

SALIVARY GLAND HOTA HAI

Answer:

molality - concentration MEASURED by the number of moles of solute PER KILOGRAM of SOLVENT. molal concentration. concentration - the strength of a solution; number of molecules of a substance in a given volume.

ANSWER:

idk

Explanation:

Answer:

PENCIL SULPHUR CANT condut to electricity

Explanation:

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Answer:

⭕..#@Ñ$W£R......

Fuel Efficiency

Fuel EfficiencyThe AMOUNT of heat energy produced on complete combustion of 1 kg of a fuel is called its calorific VALUE. The calorific value of a fuel is expressed in a unit called KILOJOULE PER kg (kJ/kg).

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Answer:

fibres are ONE of the IMPORTANT nutrients because they help in the DIGESTION of FOOD although they themselves are not digestable...

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HOME > AGE 16 - 19 > ELECTRICITY AND MAGNETISM > CURRENT ELECTRICITY > CHARGE AND CURRENT

Charge and current

Electric charge in a solid is carried by particles called electrons. One electron has a very tiny charge and so for practical measurement of electric charge we use units called COULOMBS.

A coulomb (C) is an AMOUNT of electric charge in just the same way that a litre is an AMOUNT of water.

One coulomb is the charge of roughly six million million million electrons!

The MOVEMENT of this charge round a circuit is called the electric current.

Electric current is the rate of flow of charge round a circuit. The current at a point in the circuit is the amount of charge that passes that point in one second.

Electric current is measured in AMPERES (AMPS, symbol A).

A current of 1 A is flowing in a circuit if a charge of 1 coulomb passes any point in the circuit every second.

1 Amp = 1 Coulomb per second

We can write this formula as:

Current (I) = Charge (Q) / Time (t)

or

Charge (Q) = Current (I) x Time (t)

(Charge must be given in coulombs, current in amps and time in seconds)

You may meet smaller currents than one amp in school. For these currents we use milliamps and microamps.

1 A = 1000 milliamp (mA)

1 A = 1 000 000 microamps (mA)

Currents of millions of amps are used in fusion reactors, lightning is thousands of amps, currents of around an amp or so flow in light bulbs, currents in an electric clock will be milliamps and electronic circuits operate on currents of a few microamps.

Example problems

1. A charge of 12 C passes through the filament of a car headlamp bulb in 4 s. What is the current?

Current = Charge/time = 12/4 = 3 A

2. A current of 0,5 A flows for 20 s through a small electric motor. How much charge has passed?

Charge = Current x time = 0.5 x 20 = 10C

3. A current of 200 mA flows for 2 minutes. How much charge has passed?

Charge = 0.200 x 120 = 24 C

(current in amps, time in seconds)

PROBLEMS

1. What is the current flowing when:

(a) 20 C flow by in 4 s

(b) 120 C flow by in 2 minutes

(c) 2400 C flow by in 5 minutes

(d) 20 C flow by in 100 s

2. How much charge has passed when

(a) a current of 2A flows for 5 s

(b) a current of 25 mA flows for 150 s

(c) a current of 3A flows for 5 minutes

(d) a current of 5 MA flows for 5 ms

3. Copy and complete the following table:

sp Charge Current Time

1 50 C space 5s

2 20 C space 2 minutes

3 120 C 12 A space

4 3600 C space 2 hours

5 space 50 mA 25s

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ANSWER: ok

Explanation:

ANSWER:

a-v

b-iv

c-ii

d-i

e-iii

f-vi

ANSWER:

Some Common ADDITION Polymers

Name(s) Formula Monomer

Polyethylene LOW density (LDPE) –(CH2-CH2)n– ethylene CH2=CH2

Polyethylene high density (HDPE) –(CH2-CH2)n– ethylene CH2=CH2

Polypropylene (PP) different GRADES –[CH2-CH(CH3)]n– PROPYLENE CH2=CHCH3

Poly(vinyl chloride) (PVC) –(CH2-CHCl)n– vinyl chloride CH2=CHCl

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The THREE TYPES of plant cells are found in each of the MAJOR types of plant tissues: DERMAL, ground, and vascular tissues. Dermal tissue covers the outside of a plant in a single layer of cells called the epidermis. It mediates most of the interactions between a plant and its environment.

Explanation:

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Answer:Chloroplasts are FOUND only in plant cells because they are required for photosynthesis.

Explanation:CHLOROPLAST is specific to plant cell because plants are the AUTOTROPHS which can prepare their food by conversion of light energy to chemical energy. It is the vital photosynthetic PIGMENT in leaves as it involves the conversion of light energy into chemical energy. It absorbs all the radiations of variant COLOURS like violet, blue, orange and red. But, it reflects the green light and hence the leaves appear green in colour. It absorbs the solar energy varying from the wavelength around 430nm (blue) to 662nm (red). Other than plants these are also present in some other organisms like bacteria and green algae.

Health: As OFFICIALLY defined by the World HealthOrganization, a state of COMPLETE PHYSICAL, mental, and SOCIAL well-being, not merely the ABSENCE of disease or infirmity.

Answer:

the group of cells which performs a SPECIFIC FUNCTION are CALLED tissues

A food CHAIN is a linear network of links in a food webstarting from PRODUCER organisms and ending at apex predator species, detritivores, or decomposer species. EG. Next COME organisms that eat the AUTOTROPHS; these organisms are called herbivores or primary consumers -- an example is a rabbit that eats grass.

The characteristics of the image formed by a plane mirror are :

(i) Plane mirror forms an ERECT image.

(II) It forms a virtual image.

(III) Size of the image is same as that of the object.

(iv) Image is formed at the same distance behind the mirror as the object stands in front of it.

(v)Image formed is a laterally inverted image i.e., right HAND SIDE of the object seems to be the left hand side and vice-versa.

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ANSWER:

PRISM

Answer:

1)TRUE

2)false

3)true

4)true

Answer:

Common types include: attached resource computer network (ARCNET), CONTROLLER area network bus (CANbus), CONTROL network (ControlNet), Data Highway PLUS (DH +), DeviceNet, Ethernet 10-Base T or 100-Base T, and the process FIELDBUS (PROFIBUS®). PROFIBUS is a registered trademark of PROFIBUS Internationa

Answer:

37° is the NORMAL BODY TEMPERATURE

Answer:

Hazard symbols are USED on CONTAINERS. They are there to: indicate the dangers associated with the SUBSTANCE INSIDE. give INFORMATION about how to work safely with the substance in the laboratory.

Answer:Silk cotton fabric is a mix of the two strands, joining positive attributes of each into a solitary material.

A lightweight, SATINY and agreeable weave, silk cotton texture has a delicate hand-feel and a durable, smooth wrap, alongside flexibility that makes it suitable for an all-inclusive assortment of garment uses.

It is generally made as a common cotton mix. The VERSATILITY and feel of the texture depend to a great EXTENT on the rates utilized of each.

Some silk and silk-mix fabrics, including silk cotton mixes, will survive machine washing. This procedure is on a very BASIC level more rougher than hand washing and may MAKE more damage the fibers. Use just a delicate cycle and cold water.

h

Explanation:

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Answer:

The COLD WAR was caused by the military expansionism of Stalin and his successors. The American response… was BASICALLY a defensive reaction. As long as Soviet leaders clung to their dream of IMPOSING Communism on the world, the West had no WAY (other than surrender) of ending the conflict.

Explanation:

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Answer:Here as the mass 10 kg is considered to be constant, so it depends over the nature of its INSTANTANEOUS VELOCITY. If it is moving with uniform velocity 10 m/s, then the resultant force must be zero.

Explanation:Given,

An object of mass(m) = 10 kg and

Uniform velocity = 110\dfrac{m}{s}

To find, the force ACTING on an object(F) = ?

We know that,

Force, F = ma

Where , m = mass of an object and

a = acceeration of an object

The velocity of BODY is no change(uniform).

Acceleration, a = 0

∴ F = 10 × 0

= 0 N

Hence, the force acting on an object(F) = 0 N

Answer:

Ductility is a measure of a material's ABILITY to undergo significant PLASTIC deformation before RUPTURE or breaking

ANSWER:

Answer:

READ the PASSAGE and CONSTRUCT a timeline

Step-by-step EXPLANATION:

Explanation:

Answer:

DUCTILITY is a measure of a material's ABILITY to undergo significant plastic deformation before rupture or BREAKING, which may be EXPRESSED as percent elongation or percent area reduction from a tensile test. According to Shigley's Mechanical Engineering Design significant denotes about 5.0 percent elongatio

Explanation:

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(i) Cereals provide US with carbohydrates. Also, they are a RICH source of energy.

(ii)Pulses gives us proteins.

(iii) Fruits and VEGETABLES are a rich source of VITAMINS and MINERALS. A small amount of proteins, carbohydrates and fats are also present in them.

Answer:

For an organism to become a fossil, it MUST not decompose or be EATEN. ... When an organism is buried QUICKLY, there is less decay and the better the chance for it to be preserved. The hard parts of organisms, such as bones, shells, and teeth have a better chance of BECOMING FOSSILS than do softer parts.

ANSWER:

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Answer:

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Difference Between Breathing and Respiration

As stated above, breathing is the biological process of inhaling and exhaling of the gases between the cells and the environment. The mechanism of breathing involves VARIOUS respiratory structures such as the windpipe, lungs, and nose.

Respiration, on the other hand, is a chemical process that takes place in the cell. The air that we inhale, brings OXYGEN to the lungs and is carried by the BLOOD to the cells, where it helps in the breakdown of glucose which results in the generation of ENERGY. This energy is used by the cells to carry out their respective functions.

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Answer:

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ANSWER:

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Explanation:

All ORGANISMS in an ecosystem depend upon each other. If the population of one organism rises or falls, then this can AFFECT the rest of the ecosystem. This means that all the organisms in an ecosystem are dependent upon each other.

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Explanation:

1)mass

3)Z

4)done

5) isotopes

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ANSWER:

(a) AMOEBA

Explanation:

amoeba GROWS on DEAD and decaying matter