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Correct option: True

In a closed electrical circuit, current is directly proportional to voltage and inversely proportional to resistance at constant temperature. 

 I= V/R. Where I= Current, V= Voltage & R= Resistance

Voltage is the difference in potential (charge) between two points or voltage is the amount of driving force or pressure applied to a circuit, it is measured in Volts (V). 

The resistance of a circuit is the circuit's opposition to the movement of electrons. A resistor restricts or limits the amount of current flowing in a electrical circuit, it is measured in Ohm (Ω). 

Series Resistor: When resistors are connected in series they have one point in common. The total resistance is equal to the sum of the individual resistors. 

R _tot = R₁ + R₂ + R₃ 

The current in a series circuit is the same in each component of the circuit because the current must flow through each resistor in series to get to the next resistor. I _tot = I₁ = I₂ = I₃

 The applied voltage divides across each component in a circuit in proportion to the resistance of the component. V _tot = V₁ + V₂ + V₃ 

Parallel Resistor: When resistors are connected in parallel, they have two points in common. The total resistance of parallel resistors is equal to the reciprocal of the sum of the reciprocal of the individual resistors. R tot of a parallel circuit is called the equivalent resistance, R eq =  1/R ₁ + 1/R ₂ +1/R ₃

The correct answer is Decrease.

• pH is a scale used to determine the acidity or basicity of an aqueous solution.

• The pH scale indicates the concentration of hydrogen ions in the solution.
• Solution with a pH less than 7 is considered acidic.
• Solution with a pH greater than 7 is considered basic or alkaline.
• Solutions with a pH of 7 are neutral For e.g. pure water.
• The pH value of milk is 6 because it is acidic in nature.

• When the milk is converted into curd, lactic acid is formed which is more acidic in nature.
• Therefore, the pH value of the milk decreases as it turns to curd.

Continually changing amount and direction of the current and voltage is called alternating current (AC). The components of an ac circuit causes a time period to be introduced between current and voltage; that is, current and voltage are out of phase. 

Voltage is the difference in potential (charge) between two points or voltage is the amount of driving force or pressure applied to a circuit, it is measured in Volts (V). 

Power is a rate of doing work, or works done per unit in time. The unit for measuring power is the Watt (W). Power in watts is equal to the product of the applied voltage and the current flowing. Stated algebraically, P = I E  

The property of a coil that opposes a change in the current flow is called inductance. The inductance of a coil depends on four factors: 

1) The number of turns (windings) in the coil. Inductance is proportional to the square of the number of turns in the coil. 

2) The diameter of the coil. The larger the diameter of the coil, the higher the inductance. 

3) The permeability (ability to become magnetized) of the core material.

4) The length of the coil. The shorter the coil, the higher the inductance. 

Inductors use the ability of electrical current to create a magnetic field. If a voltage is applied to a coil of wire, the current flowing in the coil will cause a magnetic field to develop. The more times the wire is coiled and the more current there is in the coil, the greater the strength of the magnetic field. Its unit is Henry, normally in milli Henry (mH). 

When two conductors are placed side by side, separated by a nonconductive material, and connected across a battery, free electrons drift in the direction of the driving voltage is called capacitor. Its unit is farad, normally in micro farad (µf) or Pico farad (pf).

Given maximum current I_max = 15 A

frequency of alternating current = 60 Hz

t = 1/200 sec

We know that I = I_max sin 2π ft

I = 15 sin 2π x 60 x t

I = 15 sin 120π x 1/200

I = 15 sin 3π/5

I = 15 x 0.95

I = 14.25 A

Men are more likely to be literate on a global average, although women are more prevalent at reading in some countries. Men and women find themselves having gender differences when attaining their educational goals.

Men tended to receive more education than women in the past, but the gender gap in education has reversed in recent decades in most Western countries and many nonwestern countries.

Male education is better than female because male is free to every work they have so much time on studying and they can go anywhere for study to better teacher while female want security and they work in home whole day they have no time for study they have many problems for her family they cannot go any where to learn by better teachers.

Kirchhoff's current law states that " the algebraic sum of current entering and leaving a node is zero." (A node is a junction of two or more branches.) 

Notable actions we're undertaking to preserve and restore natural resources include:

• Preserving ecosystems and involving the community through outreach programs;
• Restoring natural habitats following remedial activities; and.
• Conserving natural resources through water recycling and energy efficiency projects.

Kirchhoff's voltage law states that " the algebraic sum of potential rises and drops around a closed loop is zero." Σ₄V= 0

Heredity refers to the genotype (genetic makeup) of an organism. The study of heredity is called genetics and Gregor Mendel is considered to be a founder of this branch of science. He worked with the garden pea and did years of research involving traits like height, seed shape and flower color, among others.

Heredity influences several factors that contribute to fitness, such as body size and muscle fiber composition. Whether we are tall or short is determined by heredity.

Heredity is important to all living organisms as it determines which traits are passed from parent to child. Successful traits are more frequently passed along and over time can change a species. Changes in traits can allow organisms to adapt to specific environments for better rates of survival.

The correct answer is Both (A) and (B).

• The three essential things required to control fire are fuel, heat and air. 
• The air supplies oxygen and heat to raise the temperature of the fuel beyond the ignition temperature.
• Fire can be controlled by removing any one of these factors.
• Fuel can be anything that is combustible, such as wood, petroleum and spirits, and a number of gases. 
• The air feeding a fire only needs to be made up of 16% Oxygen in order to react with the heat and fuel.

Pollution is the introduction of contaminants into the natural environment that cause adverse change. Pollution can take the form of chemical substances or energy, such as noise, heat or light. Pollutants, the components of pollution, can be either foreign substances/energies or naturally occurring contaminants.

Source: Wikipedia

A universal indicator is a mixture of a number of indicators which shows different colors at different pH values.

We will expand with the help of 2st column.

D = 7|(6, -2), (-2, 11)| - (- 3)|(- 3, - 4), (- 2, 11)| + (- 4)|(-3, - 4), (6, - 2)|

= 7[(6 x 11) -(-2 x -2)] + 3[(-3 x 11) - (-4 x -2)] - 4[(-3 x - 2) - (- 4 x 6)]

= 7(66 - 4) + 3(-33 - 8) - 4(6 + 24) = 191

1. In the field of treatment- In the endoscope 

2. In the field of telecommunication, optical fiber cables are used here. 

3. Prism is used in the binoculars 

4. Prism is used in the periscopes instead of mirrors.

(i) Infinity distance.

(ii) At 2 F₂.

A hormone is a chemical that acts as a messenger transmitting a signal from one cell to another. Hormones can be classified according to chemical composition, solubility properties, location of receptors, and the nature of the signal used to mediate hormonal action within the cell.

• Cholecystokinin is a hormone that is released after a meal. It plays a key role in facilitating digestion within the small intestine. 
• It seems to be involved with appetite by increasing the sensation of fullness in the short-term, that is, during a meal rather than between meals.
• Cholecystokinin stimulates the release of bile juices from the liver and gall bladder which improves digestion.
• It regulates the movement of food through the stomach that helps in the effective absorption of nutrients from the food.
• During this process, the human body feels satiated/full and does not feel hunger. Thus, the release of cholecystokinin hormone decreases the appetite.

Thus, it is concluded that Cholecystokinin is a hormone which when injected into the human body decreases appetite.

(1) The process of obtaining the pure metal from the impure metal is called refining of the metal. 

(2) Some of the processes of refining are : 

(i) Distillation 

(ii) Poling 

(iii) Liquation 

(iv) Electrolytic refining. 

(3) The process that has to be adopted for purification of a given metal depends on the nature of the metal and its impurities.

(i) Distillation : This method is very useful for purification of low boiling metals like zinc (Zn) and mercury (Hg) containing high boiling metals as impurities. The extracted metal in the molten state is distilled to obtain the pure metal as distillate.

(ii) Poling : The molten metal is stirred with logs of green wood. The impurities are removed either as gases or they get oxidised and form sum (slag) over the surface of the molten metal. Blister copper is purified by this method.

(iii) Liquation : In this method, a low melting metal like Tin can be made to flow on a slope surface to separate it from high melting impurities. 

(iv) Electrolytic refining : 

(1) In this method, the impure metal is made to act as anode. 

(2) A strip of the same metal in pure form is used as cathode. 

(3) They are put in a suitable electrolytic bath containing soluble salt of the same metal. 

(4) The required metal gets deposited on the cathode in the pure form.

(5) The metal constituting impurity, goes as the anode mud.

The reactions are :

At anode : M→ M^{n +} + n.e^– 

At cathode : Mⁿ⁺ + n.e^–→ M

(M = pure metal, n = 1, 2, 3, .......)

The correct answer is Nitrogen.

• Nitrogen is not present in baking powder.
• Baking powder is sodium carbonate, which is NaHCO3.
• The elements present in it are sodium, hydrogen, carbon, and oxygen 
• When Baking Soda is mixed with a mild acid like tartaric acid in presence of water or carbon dioxide we get Baking Powder.
• Its Chemical equation can be given as:
  • NaHCO₃ + H+ ⇒ H₂O + Co₂ + Sodium Acid Salt
• Baking Powder is used as Antacids, making bread soft, etc.

Characteristics of homologous series : 

(1) They have one general formula. 

Ex : General formula of alkanes = C_nH_{2n + 2} 

General formula of alkynes = CnH_{2n – 2,} etc.

(2) Successive compounds in the series possess a difference of ( –CH₂) unit. 

(3) They possess similar chemical properties due to same functional group. 

(4) They show a regular gradation in their physical properties.

The issue is similar with bases: a strong base is a base that is 100% ionized in solution. If it is less than 100% ionized in solution, it is a weak base.

FeO + C \(\overset{above\,500^oC}{\longrightarrow}\) Fe + CO

ZnO + C \(\overset{above\,500^oC}{\longrightarrow}\) Zn + CO

Correct option: (B) C₆H₆

Explanation: 

According to the classification of solvents.

We know that Aprotic acid(not Protic) is one that do not ionise in H₂O to give a proton.

So from above example:

1. H3PO2 - Monoprotic

2. H3PO4 - Triprotic

3. H3PO3 - Diprotic

4. H3BO3 - Aprotic(Not protic)

The correct answer is SCIRUS.

• Scirus is the most comprehensive science-specific search engine on the Internet.
  • This web search engine focuses only on those sites and journal databases with scientific content highlights peer-reviewed articles and covers over 100 million science-related pages.
• It launched in 2001.
• ScienceDirect is operated by the British-Dutch publisher Elsevier. It was launched in March 1997.

• Google LLC is an American multinational technology company that includes online advertising technologies, a search engine, cloud computing, software, and hardware.
  • The current CEO of Google is Sundar Pichai.
  • Google was founded on 4 September 1998, Menlo Park, California, United States.
  • Parent organization: Alphabet Inc.
  • Larry Page and Sergey Brin were the founders of Google.
• Yahoo!, which includes features such as a search engine, an e-mail service, a directory, and a news branch, began as a simple collection of Yang and Filo's favorite Web sites.
  • The current CEO of yahoo is Marissa Mayer.
  • Yahoo was founded in January 1994, Sunnyvale, California, United States.
  • Parent organization: Verizon Media.
  • Founders: Jerry Yang, David Filo.
• AltaVista was a Web search engine established in 1995.
  • Founder: Louis Monier.
  • Headquarters: Palo Alto, California, U.S.

E = -2.18 * 10^-18 * Z²/n² J/atom 

For second orbit, n = 2 

For He⁺ ion, Z = 2 

Therefore,

E = -2.18 * 10^-18 * (2)² /(2)² J/atom

E = -2.18 * 10^-18 J/atom

Correct option is A) come up with

The reactions are: 
 CaCl₂ + Na₂CO₃  = CaCO₃  + 2NaCl       
 CaC0_{3 +} heat = CaO + CO₂ 

1 mole of CaO is formed from 1 mole CaCO₃ 
1 mole of CaCO₃ is formed from 1 mole of CaCl₂ 
Mole ratio of CaO to CaCl₂ is 1: 1 
Moles of CaO formed = mass/molar mass = 1.68/56=0.03mol 
Moles of CaCl₂ = 0.03mol 
Mass of CaCl₂ = 0.03 * 111 = 3.33g 
The total mass of the mixture of calcium chloride(CaCl₂) and sodium chloride(NaCl) given as 10g,
So, the % mass of CaCl₂ in the original mixture is  = 33.3 %

They are White in Colour.

Correct option is B) think over

It is Physical Change

The correct answer is Norway.

• Norway topped in the Human Development Index report, 2019.
• The United Nations Development Programme (UNDP) compiles the Human Development Index (HDI) of 189 countries in the annual Human Development Report.
• The index considers the health, education, and income in a given country to provide a measure of human development that is comparable between countries and over time.
• The HDI was first published in 1990.

• About United Nations Development Programme:
  • Headquarters - New York, New York, United States
  • Founded - 22 November 1965, United States

The correct answer is Benjamin Franklin.

• Benjamin Franklin conducted extensive research in electricity, selling his possessions to fund his work.
  • In June 1752 he is reputed to have attached a metal key to the bottom of a dampened kite string and flown the kite in a storm-threatened sky.

• Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge.
  • Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations.
  • Various common phenomena are related to electricity, including lightning, static electricity, electric heating, electric discharges.

A. Cholas Tamil Nadu

C. Meera Bai

The enzyme that breaks the bacterial cell wall is Diastase 

Ecosystem:

An ecosystem can be defined as a structure and functional unit of biosphere or segment of natural consisting of commonily of living beings and the physical environment both interacting and exchanging material between them

A.G. Tansley first defined Ecosystem as the living world and its hobitat.

Structure and Component of an ecosystem:

Structure of ecosystem involves the following:

(i) Flow of energy from non-living to living

(ii) Cycling of matter between biotic and abiotic Components

(iii) Functional relationship between organisms themselves and the environment.

There are two component of ecosystem:

(i) Biotic Component

(ii) Abiotic Component

• Biotic Component:

Living component of ecosystem constitutes its component following are the biotic components:

(i) Producers: All green plants forms the biotic components. It convers light energy into the chemical energy hence called producers.

Prokaryotes like blue green algae bacteria also forms a part of biotic component

(ii) Consumers: It is the heterotrophic component of the ecosystem. It is grouped into two classes:

(a) Macroconsumers: This includes herbirores. Also called as primary coneumers.

(b) Microconsumers: This includes micro-organisms. It adds orgnic matter by decaying dead plants and animals to the ecosystem. This includes decomposers

• Abiotic Components:

 It includes the non-living components of ecosystem. Following are the abiotic components:

(i) Inorganic substances: Various inorganic substances such as phosphorus, sulphur, Carbon, Nitrogen, hydrogen etc, takes part in Material cycles the amount of all the inorganic substances present in the ecosystem is called as standing state or standing quality.

(ii) Organic Substances: The major inorganic substances which occurs in the ecosystem includes carbohydrates, proteins and lipids. Inorganic substances are taken in by the plants and are converted into organic substances during metobolism. These are added to the environment on the death of an organisms.

(iii) Climatic System: It includes the following factors like light, rainfall, humidity, temperature, of.

Following are the methods to improving milk production and its quality:

(1) Rapidly identify mastitis problems:

Farms that consistently produces high quality milk have methods to monitor herd performonce. The rate of both clinicel and subslinical mastitis infections are very often unknown to the miking manager. A clearly defined monitoring system should be in place.

(2) Milk Clean Cows: Many studies have demonstrated that cleanliness is a good predictor of herd milk. On many dairy farms, Cows are exposed to can tangious Mastitis bacteria during the milking process.

(3) Standarsise the Milking Routine: Achieving a consistent, good rootine ls a key to quality milk. Because different milkers on the same form often follow different routines. To avoid this milking rootines should be written down and posted in the milking area. The wriging of the routine emphasises the importance of the concept of milking routine and milk quality to both manager & staff.

(4) Train Staff: Inresting in and improving employees is a smart management strategy that will reward in better job performance.

(5) Hare treatment protocols: There should be a treatments protocals which define standard treatment for mastitis.

(6) Maintain & Update the milking system: A properly functioning milking system is essential for the production of high quality milk.

(7) Buy only healthy lows: Buy only healthy cattle. Young nonleactating heifers are a minimum risk.

(8) Use Dry low therapy: The dry period is a critical time for the development of mastitis. All cows receive dry cow therapy and subsequently be checked regularly and cow accommodation must be maintained well.

(9) Monitoring the size and Crowdeness of the herd