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ANSWER:

COMBUSTION of SUBSTANCE result in physical CHANGE

ANSWER:

what to FILL in the BLANKS

ANSWER:

lysosomes

Explanation:

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ANSWER:

THERMAL Expansion

is the answer..................

ANSWER:

coocons...

the eggs of SILK MOTHS are KNOWN as cocoons..

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ANSWER:

doder

Explanation:

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Explanation:

plant cell has plastids , cell WALL , LARGE VACUOLE.

so all of these is CORRECT

Answer:

1)HOT air is lighter than cold air. The reason fr this is when air gets heated up it expands and becomes less dense than the air surrounding it also the distance between the molecules increases. So the less dense air floats in the much denser air just like ice floats on water as ice is less dense than water.

2)The kink breaks the mercury ensuring that the mercury isn't sucked back into the bulb allowing the temperature to be read. Before it can be used again the thermometer has to be shaken to force the mercury back down and remove the break.

3)Petrol and DIESEL have a tendency to catch fire (spontaneous combustion) when it's in contact with a little high temperature.... Therefore containers CARRYING petrol and diesel are coated with insulators so that the temperature inside the CONTAINER would be less....

4)For this reason, a common form of thermometer contains a liquid in a narrow glass tube. Mercury is ONE of the most familiar materials used in liquid thermometers. Other liquids, such as kerosene or ethanol, may also be used in these types of thermometers

5)Dark colors, especially black, absorb more heat since they'll absorb more light from the environment. If you're trying to stay cool, wear light colors, which absorb less heat.

ANSWER:

So don't TALK I have not SAID U to talk with me

Answer:

Osmosis is the PROCESS where solvent MOLECULES MOVE through a semipermeable membrane from a dilute solution into a more concentrated solution (which becomes more dilute)

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ANSWER:

d) Mercury

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ANSWER:

It is ANTHRACITE (C) ...............

ANSWER:

the CHANGE that can be REVERSED easily is called a PHYSICAL change

Explanation:

Ex.:-1melting of ice

EXPLANATION:

Hey mate.....

SYNTHETIC FIBRES are cheaper than natural fibre.

Synthetic fibres are cheaper than natural fibre.Synthetic fibres are stronger than natural fibre.

Synthetic fibres are cheaper than natural fibre.Synthetic fibres are stronger than natural fibre.Synthetic fibres are more durable than natural fibre.

Synthetic fibres are cheaper than natural fibre.Synthetic fibres are stronger than natural fibre.Synthetic fibres are more durable than natural fibre.Synthetic FABRICS are dried up in less time.

Synthetic fibres are cheaper than natural fibre.Synthetic fibres are stronger than natural fibre.Synthetic fibres are more durable than natural fibre.Synthetic fabrics are dried up in less time.Synthetic fibres are EASY to maintain and was

Plastic is also a polymer like the synthetic FIBRE. It is the chain of SMALL UNITS joined together.

1 .chemical change

2 .physical change

3 .physical change

4 .physical change

5. Physical changes are changes affecting the form of a chemical SUBSTANCE, but not its chemical composition. Physical changes are used to separate MIXTURES into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds EG ; boiling and freezing

6.Rusting is an oxidation reaction. The iron reacts with water and oxygen to form hydrated iron(III) oxide, which we see as rust.

Here is the word equation for the reaction:

iron + water + oxygen → hydrated iron(III) oxide

Iron and steel rust when they come into contact with water and oxygen – both are needed for rusting

eg: by galvanisation by paint

7.galvanisation is a process of of applying a PROTECTIVE zinc coating to steel or iron, to prevent rusting. the most COMMON method is hot-dip galvanizing,

8.an iron grill painted frequently to prevent for rusting.

iron can rust up the metal due to which iron grill painted frequently to prevent its contact from oxygen present it the air

explanation

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Answer:

hey UR answer is here

Explanation:

1.a bucket, a bottle, a box, a packet

2.luster, TRANSLUCENT, soft, can.

3.true, true, FALSE, true

4.copy-paper, table-wood, bag-fabric, tumbler-glass.

5.Transparent Objects : If you are able to see clearly through an object, it is allowing light to pass through it and is transparent. For example :water,clear glass ETC. Opaque Objects : If we cannot see through an object at all, it is an opaque object. For example: wooden door, wall etc.

6.Some metals often lose their shine and appear dull, because of the action of air and moisture on them. Some metals as a result of oxidation with the atmospheric oxygen form oxides and by which their appearance becomes dull.

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Answer:

High Pressure PROCESSING (HPP) is a cold pasteurization technique by which products, already sealed in its final package, are introduced into a vessel and subjected to a high level of isostatic pressure (300–600MPa/43,500-87,000psi) transmitted by water.

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Explanation:

Drag INCREASES if an object increases its speed, has a large cross-sectional area, or if the fluid it is moving through is more dense. Drag MAKES OBJECTS fall at different constant speeds, and causes energy loss in TRANSPORTATION

ANSWER:

a colorless, odorless, flammable gas that COMBINES CHEMICALLY with oxygen to form water: the LIGHTEST of the known ELEMENTS.

Answer:

COOL and diamond

Explanation:

baki KID pata KAR lo

Answer:

In the past week, we have seen a rapid escalation of cases of COVID-19.

More cases and deaths have now been reported in the rest of the world than in China.

We have also seen a rapid escalation in social distancing measures, like closing SCHOOLS and cancelling sporting events and other gatherings.

But we have not seen an urgent enough escalation in testing, isolation and contact tracing – which is the backbone of the response.

Social distancing measures can help to reduce transmission and enable health systems to cope.

Handwashing and coughing into your elbow can reduce the risk for yourself and others.

But on their own, they are not enough to extinguish this pandemic. It’s the combination that makes the difference.

As I keep saying, all countries must take a comprehensive approach.

But the most effective way to prevent infections and save lives is breaking the chains of transmission. And to do that, you must test and isolate.

You cannot fight a fire blindfolded. And we cannot stop this pandemic if we don’t know who is infected.

We have a simple message for all countries: test, test, test.

Test every suspected case.

If they test positive, isolate them and find out who they have been in close contact with up to 2 days before they developed symptoms, and test those people too. [NOTE: WHO recommends testing contacts of confirmed cases only if they SHOW symptoms of COVID-19]

Every day, more tests are being produced to meet the global demand.

WHO has shipped almost 1.5 MILLION tests to 120 countries. We’re WORKING with companies to increase the availability of tests for those most in need.

WHO advises that all confirmed cases, even mild cases, should be isolated in health facilities, to prevent transmission and provide adequate care.

But we recognize that many countries have already exceeded their capacity to care for mild cases in dedicated health facilities.

In that situation, countries should prioritize older patients and those with underlying conditions.

Some countries have expanded their capacity by using stadiums and gyms to care for mild cases, with severe and critical cases cared for in hospitals.

Another option is for patients with mild disease to be isolated and cared for at home.

Caring for infected people at home may put others in the same household at risk, so it’s critical that care-givers follow WHO’s guidance on how to provide care as safely as possible.

For example, both the patient and their care-giver should wear a medical mask when they are together in the same room.

The patient should sleep in a separate bedroom to others and use a different bathroom.

Assign one person to care for the patient, ideally someone who is in good health and has no underlying conditions.

The care-giver should wash their HANDS after any contact with the patient or their immediate environment.

People infected with COVID-19 can still infect others after they stop feeling sick, so these measures should continue for at least two weeks after symptoms disappear.

Visitors should not be allowed until the end of this period.

There are more details in WHO’s guidance.

Answer:

Cytoplasm is the PART of the CELL that CONTAINS various organelles such as mitochondria, RIBOSOMES, Golgi bodies, etc.

When we apply break, heat is generated due to the friction between BRAKES and wheels, that is RESPONSIBLE for STOPPING the brake. ... When we JUMP up-down, our MUSCULAR energy is converted to heat energy by cells that is why we feel warm in cold weather

thx

ANSWER:

then TAKE to DOCTOR if SACHIN had a FEVER.

Explanation:

100.2°F

ANSWER:

B to A direction HEAT normally take PLACE

ANSWER:

option c

Explanation:

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Answer:

the process by which plants make their own food is KNOWN as photosynthesis

formula:CARBON di OXIDE +water------ glucose +oxygen

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ANSWER:

Kelvin

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Your ANSWER is

c. It is a CHEMICAL process

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Answer:

Organisms need to take FOOD to get energy and perform life processes. ... To perform all these life processes the organism needs energy and nutrients. The energy to the organism is supplied through food. The intake food helps to perform all the activities and ALSO develops the IMMUNITY to fight against infectious DISEASES.

ANSWER:

BLUISH BLACK is the RIGHT answer

ANSWER:

see this

Explanation:

____________________________________________________________Antibiotics are used to treat severe infection, whereas vaccines prevent infections from ever becoming established. And antibiotics are based on defenses that EVOLVED in microbes, to protect them from bacteria; they are not a natural defense for us, and our bodies are not adapted to cope WELL with them.    

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____________________________________________________________

BLACK METAL SHEET ............

Answer:

ARTERIES are blood vessels responsible for carrying oxygen-rich blood away from the heart to the body. VEINS are blood vessels that carry blood low in oxygen from the body back to the heart for reoxygenation. Arteries and veins are two of the body's main type of blood vessels.

Explanation:

Blood vessels flow blood throughout the body. Arteries transport blood away from the heart. Veins RETURN blood back toward the heart. Capillaries SURROUND body cells and TISSUES to deliver and absorb oxygen, nutrients, and other substances.

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Explanation:

3Cl MEANS three separate atoms of CHLORINE.

4Cl2 means four separate MOLECULES of chlorine.

SILK absorbs minimum AMOUNT of WATER.

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ANSWER:

hope it will HELP U dear

Explanation:

40 DEGREE Celsius

ANSWER:

fungi

protozoa

bacteria

Answer:

Sulfuric ACID(H2SO4) and Sodium hydroxide(NaOH) Acid reacts with a base to FORM SALT and water. ... The reactants are base and an acid, which leads to the neutralization process and yields a salt. When they both react with each other, it leads to the formation of two product namely sodium sulfate which is salt and water.

Answer:

Fixing nitrogen into SOIL in a USEFUL form is CALLED nitrogen FIXATION .

A instrument used to see microbes is called microscope

Explanation:

Hlo mate here is ur ans....

From the sun the heat comes to US by another process KNOWN as radiation. The transfer of heat by radiation does not REQUIRE any medium...

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ANSWER:

(B)bacteria✓

is the answer.

Answer:

Here are some tips that can prevent road accidents:

Keep your eyes on the road. When you are driving,

Never USE your cell phone.

Never, ever drink and drive.

Avoid construction areas.

Follow speed limits.

Follow the RULES of the road.

Ignore AGGRESSIVE drivers.

Hope this HELPS you

Explanation:

CORONA VIRUS known as COVID-19 is a deadly diseases that CAME from Wuhan China. If u got this virus u wont be able to BREATHE , u will cough and UR through will dry u will feel like u got cold. Most important think positive and always eat healthy food and exercise everyday.

STAY STRONG STAY SAFE.

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Answer:

Draw in your notebook the symbols to represent the following components of electrical circuits: connecting wires, switch in the ‘OFF’ position, bulb, cell, switch in the ‘ON’ position, and battery?

Answer:

Connecting wires

Physics Class 7 ELECTRIC Currents Connecting Wires

2. Switch in “ON” position

Physics Class 7 Electric Currents Switch ON

3. Electric Bulb

Physics Class 7 Electric Current Bulb

4. Electric Cell

Physics Class 7 Electric Current Electric Cell

5. Switch in “OFF” position

Physics Class 7 ELectric Current Switch OFF

6. Battery

Physics Class 7 Electric Currents Battery

Question2.

Draw the circuit diagram to represent the circuit shown in Fig?

Physics Class 7 Electric Circuits Electric Circuit 5

Answer:

In the above circuit one end of the bulb is connected to the battery and another end to the safety pin.

But the other end of the battery is not connected to the safety pin. Therefore there will be no flow of current as the switch is in “OFF” position.

This shows the circuit is not complete.

Circuit diagram of the above electric circuit will be:

Physics Class 7 Electric Circuits Electric Circuit 4

Question 3.

The given figure shows four cells FIXED on a board.

Draw lines to indicate how you will connect their terminals with wires to make a battery of four cells.

Physics Class 7 Electric Circuits InCorrect Connections

Answer:

In ORDER to make battery, the positive terminal (+) of one cell should be connected to the (-) terminal of another cell and so on.

Physics Class 7 Electric Currents Battery With Correct Connections

Question 4.

The bulb in the circuit shown in figure does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow.

Physics Class 7 ElectricCircuits CIrcuit 3

Answer:

The positive terminal (+) of one cell should always be connected to negative terminal (-) of another cell.

But in case of above circuit both the positive terminals are connected to each other. This is the reason battery is not able to GENERATE electricity.

Therefore the change which should be made to the circuit will be that the positive terminal (+) should be connected to negative terminal (-) of the cell and vice-versa.

Physics Class 7 Electric Circuits Circuit 2

Question 5.

Name any two EFFECTS of electric current.

Answer:

The two effects of electric current are:-

Heating effect

Magnetic effect

Heating Effect of current: When an electric current passes through a wire, the wire gets heated. This is known as the heating effect of current.

The heating effect is used in many heating applications like electric heater, electric iron, light bulb etc.

Magnetic Effect of current: When an electric current flows through a wire, it generates magnetic field around it.

This effect is known as magnetic effect of current. Magnetic Effect of electric current has many applications like power lift, electric bell, electric fan etc.

Physics Class 7 Electric Currents Magnetic & Electric Effects

Question 6.

When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.

Answer:

The current flowing through the conducting wire creates magnetic field. When a compass is kept nearby this wire,

it will experience two magnetic fields (one magnetic field due to wire and another magnetic field due to compass).

As a result when they interact with each other there will be deflection seen in the magnetic needle.

When the current is switched off, there is no magnetic field produced by the wire, magnetic needle does not deflect from its north-south position.

Physics Class 7 ElectricCircuits Magnetic Needle

Question 7.

Will the compass needle show deflection when the switch in the circuit shown by Figure is closed?

Physics Class 7 Electric Currents Circuit With Compass

Answer:

There is no source of electric current i.e. (battery or cell). The circuit is an open circuit.

There will be no current flowing it, as a result, there will be no magnetic field produced by the wires.

Therefore there is no deflection shown by the compass needle.

Question 8.

Fill in the blanks:

(a) Longer line in the symbol for a cell represents its ­­­­­­­_________terminal.

(b) The combination of two or more cells is called a _________.

(c) When current is switched ‘on’ in a room heater, it ­­­­­­­­________.

(d) The safety device based on the heating effect of electric current is called a ___________.

Answer:

Longer line in the symbol for a cell represents its Positive­­­­

Physics Class 7 Electric Currents Electric Circuit With Battery1

The combination of two or more cells is called a Battery.

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ANSWER:

Life Cycle of a Silk Worm. Silk is a natural fibre which COMES from the cocoons of SILKWORMS, which are the LARVAE of the mulberry silk moth Bombyx mori. - A female moth lays 300-500 TINY eggs and after around 10 days, the larvae (silkworms) hatch.

Answer:

1. true

2.true

3.FALSE

4. true

5. false

Answer:

The process of SILK production is known as sericulture. ... EXTRACTING RAW silk starts by cultivating the silkworms on MULBERRY leaves. Once the worms START pupating in their cocoons, these are dissolved in boiling water in order for individual long fibres to be extracted and fed into the spinning reel.

Answer:

Nomenclature

Multicropping is probably the oldest form of agriculture and is still widespread, particularly in tropical and low-input production systems. In principle, sequential cropping, where a second crop is grown after the harvest of a first crop, is a simple form of multicropping. However, most multicrops involve the cultivation of two or more species on the same piece of land where the growth cycles of different species overlap for at least part of their DURATION. Such multicrops may take the form of intercrops, where growth and yield are confined to a single growing season, or agroforestry, where a perennial component, e.g., trees or shrubs, occupies some of the land over a series of growing seasons. Table 1 describes various TYPES of cropping system ranging from the simplicity and UNIFORMITY of monocrops, where similar plants GROW alongside each other simultaneously and sequentially from one season to the next, through to the multiplicity and heterogeneity of agroforestry systems where diverse plant types coexist within and between seasons. These complex systems may include dual canopy crops where high-value plantation crops such as oil palm (Elaeis guineensis), coconut (Cocos nucifera), cocoa (Theobroma cacoa), or rubber (Hevea brasiliensis) are interplanted with annual species. Here, a lower, shorter-duration crop complements the upper canopy of the plantation species. Alternatively, they may be MULTIPURPOSE home gardens containing a woody component alongside vegetables, staples, and fruits.