Given: R1 = 100Ω, R2 = 50 Ω, R3 = 500 Ω all are connected in parallel Potential difference = 220V Thus, 1/R=1/100Ω+1/50Ω+1/500Ω=(5+10+1)/500Ω=16/500Ω Therefore, R=500/16Ω=31.25Ω Electric current (I) through the circuit = V/R ⇒I=220V/31.25Ω=7.04A For electric iron Since it takes as well current as thRead more
Given:
R1 = 100Ω, R2 = 50 Ω, R3 = 500 Ω all are connected in parallel
Potential difference = 220V
Thus, 1/R=1/100Ω+1/50Ω+1/500Ω=(5+10+1)/500Ω=16/500Ω
Therefore, R=500/16Ω=31.25Ω
Electric current (I) through the circuit = V/R ⇒I=220V/31.25Ω=7.04A
For electric iron
Since it takes as well current as three appliances, thus electric current through it = 7.04A
The electric current = 7.04 A and potential difference = 220 V
Thus, Resistance of electric iron = Total resistance of three appliances = 31.25 Ω
Thus, electric current through the electric iron = 7.04A
Resistance of electric iron = 31.25 Ω
SI unit of electric current is ampere (A). Ampere is the flow of electric charges through a surface at the rate of one coulomb per second, i.e. if 1 coulomb of electric charge flows through a cross section for 1 second, it would be equal to 1 ampere. Therefore, 1 ampere = 1C/1s
SI unit of electric current is ampere (A).
Ampere is the flow of electric charges through a surface at the rate of one coulomb per second, i.e. if 1 coulomb of electric charge flows through a cross section for 1 second, it would be equal to 1 ampere.
Therefore, 1 ampere = 1C/1s
In an electric motor, after every half rotation the direction of coil gets reversed due to change in orientation of the magnetic field. To ensure a continuous rotation; a split ring is attached to the coil so that the polarity of the coil changes after every half rotation. This changes the directionRead more
In an electric motor, after every half rotation the direction of coil gets reversed due to change in orientation of the magnetic field. To ensure a continuous rotation; a split ring is attached to the coil so that the polarity of the coil changes after every half rotation. This changes the direction of current and thus the armature keeps on rotating continuously.
Aerobic respiration In most of the plants and the animals, respiration occurs by the use of molecular oxygen and release of carbon dioxide, this phenomena is known as aerobic respiration. The organisms which carry aerobic respiration are known as aerobes. Gases are exchanged in this type of respiratRead more
Aerobic respiration
In most of the plants and the animals, respiration occurs by the use of molecular oxygen and release of carbon dioxide, this phenomena is known as aerobic respiration.
The organisms which carry aerobic respiration are known as aerobes.
Gases are exchanged in this type of respiration.
And, their metabolism occurs in cytoplasm or mitochondria.
Glucose gets broken down into the carbon dioxide, water and energy is released in the form of ATP. It yields more energy available in glucose.
Examples:- all higher organisms like mammals and plants, sponges, flatworms, roundworms etc. have this type of respiration.
Anaerobic respiration
n some organisms, respiration occurs without the use of molecular oxygen and it may or may not involve the production of carbon dioxide, this phenomena is known as anaerobic respiration.
The organisms which carry anaerobic respiration are known as anaerobes.
Gases are not exchanged in this type of respiration.
Their metabolism occurs in only cytoplasm.
In this glucose breaks down into ethyl alcohol and carbon dioxide without using oxygen, also known as alcoholic fermentation and lactic acid fermentation. And it yields only 5% energy available in glucose.
Alcoholic fermentation or yeast oxidization:-
Examples:- lower organisms like bacteria and yeast have this type of respiration. In bacteria, glucose breaks down into lactic acid and energy without the use of oxygen and without the production of carbon dioxide.
Necessary conditions for autotrophic nutrition : (i) Presence of chlorophyll in the living cells. (if) Provision of supply of water to green plants or cells of the plant. (iii) Sufficient sunlight. (iv) Sufficient supply of carbon dioxide. By-product of auto tropic nutrition is oxygen
Necessary conditions for autotrophic nutrition :
(i) Presence of chlorophyll in the living cells.
(if) Provision of supply of water to green plants or cells of the plant.
(iii) Sufficient sunlight.
(iv) Sufficient supply of carbon dioxide.
By-product of auto tropic nutrition is oxygen
Human digestive system includes various glands and salivary gland is one of them. Saliva is secreted by salivary gland located under the tongue which helps in the digestion of food and it contains water, salts, mucin and some enzymes salivary amylase or ptyalin. PH is neutral i.e, 6.7. about 1.5 litRead more
Human digestive system includes various glands and salivary gland is one of them. Saliva is secreted by salivary gland located under the tongue which helps in the digestion of food and it contains water, salts, mucin and some enzymes salivary amylase or ptyalin. PH is neutral i.e, 6.7. about 1.5 litres saliva and mucus are secreted in every 24 hours in the buccal cavity. Salivation activation depends on the smell, idea and imagination of food.
Fats are the triglycerides and they are digested through the lipases. Digestion process starts in stomach and finally gets completed in the small intestine through various agents, juices etc. small intestine is the place where the fats digestion takes place, and the digestion of fats gives the fattyRead more
Fats are the triglycerides and they are digested through the lipases. Digestion process starts in stomach and finally gets completed in the small intestine through various agents, juices etc. small intestine is the place where the fats digestion takes place, and the digestion of fats gives the fatty acids and the glycerol as their end products.
Small intestine:- In this food is in the form of fat digested by the three secretions; Bile, pancreatic juice and the intestinal juice.
Bile:- bile is secreted by the liver, has no enzymes and no catalytic reactions. Salts are present which reduces the surface tension of the large fat droplets and they break them into the smaller ones and this process is known as emulsification. It produces a fine emulsion of fats in the intestine. Triglycerides get converted into the emulsified triglycerides by the action of the Bile salts.
Pancreatic juice:- it contains fat- digesting enzymes which hydrolysis fats. It converts triglycerides into the diglycerides, then the diglycerides broken down into the monoglyceride and the fatty acids and they finally get converted into the another 3 fatty acid molecules and the glycerol.
Intestinal juice:- intestinal glands secrete the intestinal juice or intestinal lipase. Only a small amount of enzymes are released into the intestinal juice. This intestinal lipase helps in the hydrolysis of the absorbed Triglycerides, Diglycerides to monoglycerides and fatty acids.
d) All of the above. The organisms make their own food, i.e, organic food from the inorganic material with the help of photosynthesis process. And, photosynthesis is the process in which when organisms take carbon dioxide and water from the environment and by using sunlight they convert them into thRead more
d) All of the above.
The organisms make their own food, i.e, organic food from the inorganic material with the help of photosynthesis process. And, photosynthesis is the process in which when organisms take carbon dioxide and water from the environment and by using sunlight they convert them into the glucose or oxygen and is taken by the chlorophyll.
a) Transport of water Xylem is a complex tissue composed of living and non-living cells. The conducting cells are mostly non- living and includes two types of tracheary elements- tracheids and vessel elements. Water and minerals from the soil enter into the plant through the root and then through roRead more
a) Transport of water
Xylem is a complex tissue composed of living and non-living cells. The conducting cells are mostly non- living and includes two types of tracheary elements- tracheids and vessel elements. Water and minerals from the soil enter into the plant through the root and then through root cortex and finally get passed into the xylem, moves upward into the leaves. The upward movement of the water and the minerals from roots to the aerial parts of the plant against the gravitational force through the xylem is known as ascent of the sap.
(a) Hydrogen gas combines with nitrogen to form ammonia H2 + N2 ---------→ NH3 Hydrogen gas + nitrogen gas -→ Ammonia 3H2 + N2 -----------→ 3NH3 Hydrogen gas + NItrogen gas -→ Ammonia (b) HydrogRead more
(a) Hydrogen gas combines with nitrogen to form ammonia
H2 + N2 ———→ NH3
Hydrogen gas + nitrogen gas -→ Ammonia
3H2 + N2 ———–→ 3NH3
Hydrogen gas + NItrogen gas -→ Ammonia
(b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide
H2S(g) + O2(g) —-→ H2O(l) + SO2(g)
Hydrogen sulphide gas + Oxygen (from air) -→ water + Sulpur dioxide
2H2S(g) + 3O2(g) -→ 2H2O(l) + 2SO2(g)
(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate
An electric lamp of 100 ohm, a toaster of resistance 50 ohm, and a water filter of resistance 500 ohm are connected in parallel to a 220 V source. What is the resistance of an electric iron connected to the same source that takes as much current as all three appliances, and what is the current through it?
Given: R1 = 100Ω, R2 = 50 Ω, R3 = 500 Ω all are connected in parallel Potential difference = 220V Thus, 1/R=1/100Ω+1/50Ω+1/500Ω=(5+10+1)/500Ω=16/500Ω Therefore, R=500/16Ω=31.25Ω Electric current (I) through the circuit = V/R ⇒I=220V/31.25Ω=7.04A For electric iron Since it takes as well current as thRead more
Given:
See lessR1 = 100Ω, R2 = 50 Ω, R3 = 500 Ω all are connected in parallel
Potential difference = 220V
Thus, 1/R=1/100Ω+1/50Ω+1/500Ω=(5+10+1)/500Ω=16/500Ω
Therefore, R=500/16Ω=31.25Ω
Electric current (I) through the circuit = V/R
⇒I=220V/31.25Ω=7.04A
For electric iron
Since it takes as well current as three appliances, thus electric current through it = 7.04A
The electric current = 7.04 A and potential difference = 220 V
Thus, Resistance of electric iron = Total resistance of three appliances = 31.25 Ω
Thus, electric current through the electric iron = 7.04A
Resistance of electric iron = 31.25 Ω
Define the unit of current.
SI unit of electric current is ampere (A). Ampere is the flow of electric charges through a surface at the rate of one coulomb per second, i.e. if 1 coulomb of electric charge flows through a cross section for 1 second, it would be equal to 1 ampere. Therefore, 1 ampere = 1C/1s
SI unit of electric current is ampere (A).
Ampere is the flow of electric charges through a surface at the rate of one coulomb per second, i.e. if 1 coulomb of electric charge flows through a cross section for 1 second, it would be equal to 1 ampere.
See lessTherefore, 1 ampere = 1C/1s
What is the role of the split ring in an electric motor?
In an electric motor, after every half rotation the direction of coil gets reversed due to change in orientation of the magnetic field. To ensure a continuous rotation; a split ring is attached to the coil so that the polarity of the coil changes after every half rotation. This changes the directionRead more
In an electric motor, after every half rotation the direction of coil gets reversed due to change in orientation of the magnetic field. To ensure a continuous rotation; a split ring is attached to the coil so that the polarity of the coil changes after every half rotation. This changes the direction of current and thus the armature keeps on rotating continuously.
See lessWhat are the differences between aerobic and anaerobic respiration? Name some organisms that use the anaerobic mode of respiration.
Aerobic respiration In most of the plants and the animals, respiration occurs by the use of molecular oxygen and release of carbon dioxide, this phenomena is known as aerobic respiration. The organisms which carry aerobic respiration are known as aerobes. Gases are exchanged in this type of respiratRead more
Aerobic respiration
Anaerobic respiration
- n some organisms, respiration occurs without the use of molecular oxygen and it may or may not involve the production of carbon dioxide, this phenomena is known as anaerobic respiration.
- The organisms which carry anaerobic respiration are known as anaerobes.
- Gases are not exchanged in this type of respiration.
- Their metabolism occurs in only cytoplasm.
- In this glucose breaks down into ethyl alcohol and carbon dioxide without using oxygen, also known as alcoholic fermentation and lactic acid fermentation. And it yields only 5% energy available in glucose.
- Examples:- lower organisms like bacteria and yeast have this type of respiration. In bacteria, glucose breaks down into lactic acid and energy without the use of oxygen and without the production of carbon dioxide.
See lessAlcoholic fermentation or yeast oxidization:-
What are the necessary conditions for autotrophic nutrition and what are its by products?
Necessary conditions for autotrophic nutrition : (i) Presence of chlorophyll in the living cells. (if) Provision of supply of water to green plants or cells of the plant. (iii) Sufficient sunlight. (iv) Sufficient supply of carbon dioxide. By-product of auto tropic nutrition is oxygen
Necessary conditions for autotrophic nutrition :
See less(i) Presence of chlorophyll in the living cells.
(if) Provision of supply of water to green plants or cells of the plant.
(iii) Sufficient sunlight.
(iv) Sufficient supply of carbon dioxide.
By-product of auto tropic nutrition is oxygen
What is the role of saliva in the digestion of food?
Human digestive system includes various glands and salivary gland is one of them. Saliva is secreted by salivary gland located under the tongue which helps in the digestion of food and it contains water, salts, mucin and some enzymes salivary amylase or ptyalin. PH is neutral i.e, 6.7. about 1.5 litRead more
Human digestive system includes various glands and salivary gland is one of them. Saliva is secreted by salivary gland located under the tongue which helps in the digestion of food and it contains water, salts, mucin and some enzymes salivary amylase or ptyalin. PH is neutral i.e, 6.7. about 1.5 litres saliva and mucus are secreted in every 24 hours in the buccal cavity. Salivation activation depends on the smell, idea and imagination of food.
See lessHow are fats digested in our bodies? Where does this process take place?
Fats are the triglycerides and they are digested through the lipases. Digestion process starts in stomach and finally gets completed in the small intestine through various agents, juices etc. small intestine is the place where the fats digestion takes place, and the digestion of fats gives the fattyRead more
Fats are the triglycerides and they are digested through the lipases. Digestion process starts in stomach and finally gets completed in the small intestine through various agents, juices etc. small intestine is the place where the fats digestion takes place, and the digestion of fats gives the fatty acids and the glycerol as their end products.
Small intestine:- In this food is in the form of fat digested by the three secretions; Bile, pancreatic juice and the intestinal juice.
Triglycerides —Bile salts→ Emulsified Triglycerides
- Pancreatic juice:- it contains fat- digesting enzymes which hydrolysis fats. It converts triglycerides into the diglycerides, then the diglycerides broken down into the monoglyceride and the fatty acids and they finally get converted into the another 3 fatty acid molecules and the glycerol.
- Intestinal juice:- intestinal glands secrete the intestinal juice or intestinal lipase. Only a small amount of enzymes are released into the intestinal juice. This intestinal lipase helps in the hydrolysis of the absorbed Triglycerides, Diglycerides to monoglycerides and fatty acids.
See lessTriglycerides —Lipase→ Fatty Acid + Diglycerides
Diglycerides —Lipase→ Fatty Acid + Monoglyceride
Monoglyceride —Lipase→ Fatty Acid + Glycerol
The autotrophic mode of nutrition requires
d) All of the above. The organisms make their own food, i.e, organic food from the inorganic material with the help of photosynthesis process. And, photosynthesis is the process in which when organisms take carbon dioxide and water from the environment and by using sunlight they convert them into thRead more
d) All of the above.
The organisms make their own food, i.e, organic food from the inorganic material with the help of photosynthesis process. And, photosynthesis is the process in which when organisms take carbon dioxide and water from the environment and by using sunlight they convert them into the glucose or oxygen and is taken by the chlorophyll.
See lessThe xylem in plants are responsible for
a) Transport of water Xylem is a complex tissue composed of living and non-living cells. The conducting cells are mostly non- living and includes two types of tracheary elements- tracheids and vessel elements. Water and minerals from the soil enter into the plant through the root and then through roRead more
a) Transport of water
Xylem is a complex tissue composed of living and non-living cells. The conducting cells are mostly non- living and includes two types of tracheary elements- tracheids and vessel elements. Water and minerals from the soil enter into the plant through the root and then through root cortex and finally get passed into the xylem, moves upward into the leaves. The upward movement of the water and the minerals from roots to the aerial parts of the plant against the gravitational force through the xylem is known as ascent of the sap.
See lessTranslate the following statements into chemical equations and then balance them.
(a) Hydrogen gas combines with nitrogen to form ammonia H2 + N2 ---------→ NH3 Hydrogen gas + nitrogen gas -→ Ammonia 3H2 + N2 -----------→ 3NH3 Hydrogen gas + NItrogen gas -→ Ammonia (b) HydrogRead more
(a) Hydrogen gas combines with nitrogen to form ammonia
H2 + N2 ———→ NH3
Hydrogen gas + nitrogen gas -→ Ammonia
3H2 + N2 ———–→ 3NH3
Hydrogen gas + NItrogen gas -→ Ammonia
(b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide
H2S(g) + O2(g) —-→ H2O(l) + SO2(g)
Hydrogen sulphide gas + Oxygen (from air) -→ water + Sulpur dioxide
2H2S(g) + 3O2(g) -→ 2H2O(l) + 2SO2(g)
(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate
BaCl2(aq) + Al2(SO4)3(aq) ——–→ AlCl3(aq) + BaSO4(s)
Barium chloride + Aluminium sulphate→ Aluminium chloride + Barium sulphate
3BaCl2(aq) + Al2(SO4)3(aq) ——-→ 2AlCl3(aq) + 3BaSO4(s)
(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas
K(s) + H2O(l) —–→ KOH(aq) + H2(g)
Potassium + Water -→ potassium hydroxide + hydrogen gas
2K(s) + 2H2O(l) -→ 2KOH(q) + H2(g)
See less