EMRS PGT Chemistry Mock Test - 9 - EMRS MCQ

Concept:

The nucleus of the Cell

• The cell is the basic building block of all living beings. 
• The nucleus is the special structure located generally at the center of the cell. 
• The nuclear membrane separates the cytoplasm from the nucleus. 
• The nucleus contains a central part called nucleolus and chromosomes. 
• Chromosomes and nucleolus coexist in the nucleus. Chromosomes are not present in the nucleolus.

Chromosomes and Genes

• Chromosomes carry genes and help in the inheritance or transfer of characters from the parents to their children. 
• The chromosomes can be seen only when the cell divides.
• The credit for the discovery of chromosomes goes to Strasburger as he first described the chromosome structure seen in the nucleus during cell division.
• Usually, chromosomes are rod-shaped, elongated, or dot-like in shape with sizes varying from 0.5 to 32 micrometer.
• In humans, 23pairs of chromosomes are found i.e. 46 in numbers.

Conclusion:

• Chromosomes are present in the nucleus of the cell. So, all the given options are wrong. 
• The correct option is None of these.

Additional Information

• The cell membrane is also known as the plasma membrane. 
  • It is a porous structure that allows the exit and entry of certain materials according to its requirement. 
  • This is the major function of the cell membrane. 
• The cytoplasm is between the cell and the nucleus.
  • Cell organelles like mitochondria, Golgi bodies, ribosomes, etc. are present in the cytoplasm. 
  • Mitochondria is called the powerhouse of cells and is responsible for cellular respiration. 
  • vacuole is open space between cell which is used for storing food. 
• Plastids are double-membrane organelles found in the plant cell. They contain pigments that help the plant in photosynthesis. 

The correct answer is Ethanol + Methanol​.

• Ethanol + Methanol​ is denatured alcohol.
• Denatured alcohol is ethanol that has additives to make it poisonous, bad-tasting, foul-smelling, or nauseating to discourage its recreational consumption.
• The term denatured alcohol refers to alcohol products adulterated with toxic and/or bad tasting additives (e.g., methanol, benzene, pyridine, castor oil, gasoline, isopropyl alcohol, and acetone), making it unsuitable for human consumption.
• The most common additive used is methanol (5–10%), giving rise to the term methylated spirits. Denatured alcohol is used as a lower-cost solvent or fuel for home-scale or industrial use.

Key Points

• Denatured alcohol is ethanol or grain alcohol that contains additional chemicals called denaturants that make it unfit for human consumption.
• Denatured alcohol is fine for some types of lab work and as an ingredient in certain products, but it's not safe to drink.
• Ethanol is an organic chemical compound. It is simple alcohol with the chemical formula C₂H₆O.
• Its formula can be also written as CH₃−CH₂−OH or C₂H₅OH and is often abbreviated as EtOH.

Additional Information

• Alcohol (ethanol or ethyl alcohol) is the ingredient found in beer, wine, and spirits that causes drunkenness.
• Alcohol is formed when yeast ferments (breaks down without oxygen) the sugars in different food. 

Concept-

• We know that all living organisms need food.
• Food supplies proteins, carbohydrates, fats, vitamins, and minerals, all of which we require for body development, growth, and health.
• Both plants and animals are major sources of food for us.
• We obtain most of this food from agriculture and animal husbandry.
• Cereals such as wheat, rice, maize, millets, and sorghum provide us carbohydrates for energy requirements.

Explanation-

The principal food crop of the world is wheat.

• Wheat is a Rabi crop that belongs to the Gramineae family.
• The scientific name of rice is Triticum aestivum.
• Wheat is the principal crop for millions of people in the world.
• Wheat grain is used for cooking.
• So, it is the principal cereal crop compared to rice, maize, and barley. 

Additional Information

• The major food crop of the world that belongs to the family is Gramineae. 
• Gramineae is also known as the Poaceae is the family that contains all the major crops that belong to the grass family.
• Poaceae or Gramineae is the most economically important plant family, providing staple foods from domesticated cereal crops as well as feed for meat-producing animals. 
• Examples such as maize, wheat, rice, barley, and millets, etc.

The correct answer is Robert Clive.

Key Points

When Alivardi Khan died in 1756, Sirajuddaulah became the nawab of Bengal.

• The Company was worried about his power and keen on a puppet ruler who would willingly give trade concessions and other privileges.
• So it tried, though without success, to help one of Sirajuddaulah’s rivals become the nawab.
• An infuriated Sirajuddaulah asked the Company to stop meddling in the political affairs of his dominion, stop fortification, and pay the revenues.
• After negotiations failed, the Nawab marched with 30,000 soldiers to the English factory at Kassimbazar, captured the Company officials, locked the warehouse, disarmed all Englishmen, and blockaded English ships.
• Then he marched to Calcutta to establish control over the Company’s fort there.

Important Points

• On hearing the news of the fall of Calcutta, Company officials in Madras sent forces under the command of Robert Clive, reinforced by naval fleets.
• Prolonged negotiations with the Nawab followed.
• Finally, in 1757, Robert Clive led the Company’s army against Sirajuddaulah at Plassey. 
• The Battle of Plassey became famous because it was the first major victory the Company won in India.

Thus, it is clear that Robert Clive led the company's army against Sirajudallah at Plassey.

Additional Information

• James Mill was a famous economist and political philosopher from Scotland.
• The Permanent Settlement of Bengal was brought into effect by the East India Company headed by Governor-General Lord Cornwallis in 1793.
• Lord Dalhousie devised a policy that came to be known as the Doctrine of Lapse.

Given:

Number of work completed by Rita and Meena = 10 days

Number of work completed by Rita alone = 15 days

Formula used:

Work = Efficiency × Time

Calculation:

LCM of 10 and 15 is 30

Efficiency of Rita and Meena = (30/10) = 3 units/day

Efficiency of Rita = (30/15) = 2 units/day

Efficiency of Meena = [30/(3 – 2)] units/day

⇒ (30/1) unit/day

⇒ 30 days

∴ The required time to complete the work by Meena is 30 days

Preparing the family tree using the following symbols:

A possible tree diagram will be:

Praveena’s father’s sister’s mother is the grandmother of Sandhya.

Hence, "Grandmother" is the correct answer.

The logic followed here is:

1) Intact and Unflawed are synonyms meaning not damaged and perfect.

2) Entire and Partial are antonyms.

3) Bright and Luminous are synonyms.

4) Pure and Perfect are synonyms.

Both the words are synonyms in all the options except option 2, where the given words are antonyms.

Hence, the correct answer is "Entire : Partial".

The pattern followed is:

Hence, the correct answer is "110".

PCI₅
sp³d-hybrid orbitals—No non-bonding pair trigonal bipyramidal structure.

IF₅ sp³d²-hybrid orbitals—One non-bonding pair; one F and non-bonding pair lie in different sides so as to minimise repulsion. Square pyramidal.

The main chemicals in air pollution that create acid rain are sulfur dioxide (SO2) and nitrogen (NO2). Acid rain usually forms high in the clouds where sulfur dioxide and nitrogen oxides react with water, oxygen, and oxidants. this mixture forms a mild solution of sulfuric acid and nitric acid.

Electronegativity increases as we move from left to right due to lanthanide contraction.

Based on VSEPR model, it is (T-shaped).
Thus, (i) → (r)


AX₄E₂ (Square planar)

Thus, (ii) → (s)
(iii)   lone pair = 1, AX₄E (See-saw)

Thus, (iii) → (q) 
lone pair = 3

Linear structure
Three lone pairs are at equatorial position to minimise repulsion.
Linear structure.
Three lone pairs are at equatorial position to minimise repulsion.
Thus, (iv) → (p)

photochemical smog has high concentration of oxidising agent.

Thermite process doesn’t require a catalyst.

The electronic configuration of carbon in its ground state is given by 1s²2s²2p⁴. When it’s in an excited state, that is when it loses an electron, that would be from 2p-orbital. So the excited state’s electronic configuration is 1s²2s¹2p³.

The correct answer is Option A.

AS₂S₃ is an anionic sol (negative sol) hence coagulation will depend on coagulating power of cation , which is directly proportional to the valency of the cation (Hardy-Schulze rule). 
Hence positive ions having maximum amount of charge will have more coagulation thus, Al³⁺ have maximum coagulating power.

Due to lanthanide contraction, Ag and Au have nearly same size.

Progressive education advocates that young learners should be given the freedom to learn according to their preferences and likes

The National Education Policy 2020 proposed various reforms in school education as well as higher education including technical education that has to be adopted by all educational institutions.

Key Points The ECCE program needs to be determined by children’s developmental and contextual needs, providing for more need-based inputs and an enabling environment.

• Ensuring quality ECCE - early childhood care and education for all children between 3-6 years.
• It was believed that a common ‘curriculum’ would not be appropriate for all.
• It comprises details of the goals for different domains of development, i.e. physical, language, cognitive, socio-emotional, creative, and aesthetic appreciation, to be fostered to ensure holistic development of children under six years.​

Hence we can say that the full form of ECCE is Early Childhood Care and Education.

Additional Information Other reforms of NEP 2020 include -

• Equitable and inclusive education - Special emphasis is given to Socially and Economically Disadvantaged  Groups (SDGs).
• Ensuring Universal Access at All Levels of schooling from pre-primary school to Grade 12.
• New Curricular and Pedagogical Structure (5+3+3+4).
• Setting up of State School Standards Authority (SSSA).

Education Policy lays particular emphasis on the development of the creative potential of each individual. It is based on the principle that education must develop not only cognitive capacities - both the ‘foundational capacities ’of literacy and numeracy and ‘higher-order’ cognitive capacities, such as critical thinking and problem solving – but also social, ethical, and emotional capacities and dispositions.

National Education Policy 2020-

According to NEP 2020, A good educational institution is one in which every student feels welcomed and cared for, where a safe and stimulating learning environment exists, where a wide range of learning experiences are offered, and where good physical infrastructure and appropriate resources conducive to learning are available to all students.

Key PointsSome important fundamental principles of the NEP 2020 are- 

• Full equity and inclusion as the cornerstone of all educational decisions to ensure that all students are able to thrive in the education system.
• It includes the overall development of the leader, it covers all three aspects as Cognitive domain, affective domain, and psychomotor domain.
• Promoting self-assessment and the peer assessment done by the student in the classroom.
• Focus on regular formative assessment for learning rather than the summative assessment that encourages today’s ‘coaching culture. It promotes 360- degree multidimensional progress report cards on the basis of different methods of assessments.
• Respect for diversity and respect for the local context in all curriculum, pedagogy, and policy, always keeping in mind that education is a concurrent subject.
• Emphasis on conceptual understanding rather than rote learning and learning-for-exams.
• Creativity and critical thinking encourage logical decision-making and innovation.
• Establishment of the linkage of the concepts with the environment or we can say that the linkage of the school with the home.
• Promoting multilingualism and the power of language in teaching and learning.
• It emphasizes group work as well as individual work, NEP 2020 links the study to the curriculum.

So that we can conclude that 360- degree multidimensional progress report cards follow National Education Policy 2020 proposes in the content of the assessment.

Education Policy lays particular emphasis on the development of the creative potential of each individual. It is based on the principle that education must develop not only cognitive capacities - both the ‘foundational capacities ’of literacy and numeracy and ‘higher-order’ cognitive capacities, such as critical thinking and problem solving – but also social, ethical, and emotional capacities and dispositions.

National Education Policy 2020-

According to NEP 2020, A good educational institution is one in which every student feels welcomed and cared for, where a safe and stimulating learning environment exists, where a wide range of learning experiences are offered, and where good physical infrastructure and appropriate resources conducive to learning are available to all students.

Key Points Some important fundamental principles of the NEP 2020 are- 

• Establishment of the linkage of the concepts with the environment or we can say that the linkage of the school with the home.
• It includes the overall development of the leader, it covers all three aspects as Cognitive domain, affective domain, and psychomotor domain.
• It will include Progress of the Child in Inquiry-Based Learning, Quiz, Projects Roleplay, Group Work, Portfolios, etc, as part of the assessment of the students.
• Promoting self-assessment and the peer assessment done by the student in the classroom.
• Making board examination low stake and less stressful by focusing on Logic and Core Competencies
• It emphasizes group work as well as individual work, NEP 2020 links the study to the curriculum.
• Hence we conclude that all the objectives given in the question are correct for the assessment of the student.

Important Points  There are many changes in the assessment of the child, proposed in NEP 2020:

• Continuous Tracking Of Learning Outcome Of Each Child.
• Board Examinations to be made more flexible with an assessment of essential skills.
• Assessment to focus on core concepts, higher-order, and foundational skills 
• AI-based soft wares to help track the progress of students to enable them to make optimal career choices.
• National Assessment Centre (PARAKH) will bring greater synergy to board examinations.
• Self Assessment & Peer Assessment.
• National Testing Agency (NTA) will work to offer a Common Aptitude Test of high quality to eliminate the need for coaching for these exams. 

NEP 2020 is the third education system in the history of independent India after the policy of 1968 and the second policy of 1986.

• It is an ambitious and futuristic policy that ensures opportunities for children to hone their talents by fixing the lacunae in the education system.

Key Points 

• According to NEP 2020, Vocational education is perceived to be inferior to mainstream education and meant largely for students who are unable to cope with the latter. 
• In NEP-2020, small number of students receives vocational education because:
  • the opportunity in vocational courses becomes restricted that results in the lack of vertical mobility.
  • Vocational education, in the past, focused largely on Grades 11-12 and on dropouts in Grade 8 and upwards.
  • Students passing out from Grades 11-12 with vocational subjects often did not have well-defined pathways to continue with their chosen vocation.

Hence, it could be concluded that all of the above is correct in the context of the question.

The correct spelling is "referendum". It means a vote on a topic by the people. 
Example-  The referendum on Brexit has been quite a disastrous one.

The sentence seems to say that the person in concern was expecting a surprise on his birthday and not accepting it. Expect means to want or wish for something whereas accepting means to receive or recognize some issue.
Thus option 2 is correct.

Rule- If the reporting verb is in the past tense, the verb in the reported speech is changed to the corresponding past form.  
Thus, the sentence is changed to the corresponding past form. 

'वह ग्रंथ हिंदी लिपि में है।' वाक्य ग़लत है।

• अशुद्ध वाक्य - वह ग्रंथ हिंदी लिपि में है।
• शुद्ध वाक्य - वह ग्रंथ देवनागरी लिपि में है।
• हिंदी कोई लिपि नहीं है वह एक भाषा है।
• हिंदी भाषा की लिपि देवनागरी है।

Key Pointsअन्य विकल्पों में कोई त्रुटि नहीं है -

• अध्यक्ष महोदय मुस्कुराने लगे।
• ईश्वर आपका भला करें।
• ओह! तुम कल जाओगे।

Additional Informationदेवनागरी लिपि की विशेषताएँ -

• देवनागरी लिपि के उच्चारण और प्रयोग में समानता होती है।
• देवनागरी लिपि पूर्णतया वैज्ञानिक है।
• देवनागरी में निश्चित मात्राएँ हैं।
• इसमें प्रत्येक ध्वनि के लिए अलग लिपि चिह्न है।
• इसमें वर्ण का कोई भ्रम नहीं है।
• प्रत्येक वर्ग में अघोष फिर सघोष वर्ण हैं।
• यह लिपि लिखाई और छपाई दोनों में समान है।