Explore topic-wise InterviewSolutions in .

A wide variety of resistors are physically large enough to have their resistance value printed on them. However, carbon composition resistors are too small for this method of identification so a color coding system is used. Four bands are printed on one end of the resistor and are read from the band closest to the end of the resistor toward the center. Each color represents a numerical value as indicated below. 

Active-Red, Neutral-Black/Blue, Earth-Green

Answer: c) 1.16 x10³  

n = 6 to n= 2

E = \(13.6\times Z_1^2[\frac{1}{4}-\frac{1}{36}]\)

\(=13.6\times 4\times[\frac{9-1}{36}]\)

\(=13.6\times4\times\frac{8}{36}\)

= 12.08 ev x 96kj/mol

=1.16 x 10³

We have given-----

Mass of NaOH = 5.5 g

Volume of water = 175 ml

Temperature change of water = +2.10°C

specific Heat capacity of water = 4.184 J/g°C

\(\because\) Temperature of water increases, it means, dissolution of NaOH in water is a exothormic process.

We know that,

density of water = 1 g/ml at STP

\(\therefore\) Mass of water = 175 ml x 1g/mL

 = 175 g

Heat absorbed by water Q = m x s x Δt

where, m = mass of water

S = specific Heat of water  = 4.18 J/g°C

 Δt = change in temperature

\(\therefore\) Q = 175 g x 4.18 4J/g°C x 2.10°C

= 1.537 KJ

 = 1.54 KJ

\(\therefore\) The correct Thermochemical equation will be----

NaOH(s) → NaOH(aq) + 1.54 KJ

Hence, Option (A) is right answer.

Oxygen gas present in the atmosphere is essential for respiration. 

The two characteristics of ideal gas are:

• There are a large number of molecules in ideal gas.
• The volume occupied by the molecules when compared to the volume occupied by the gas, its seems negligible.

Subjects and objects have the opposite functions in a sentence.

•   A subject is the person, place, or thing that performs the action (verb).
•  A noun or pronoun can be used as the object in a sentence. An object is the person, place, or thing that receives the action.
• In grammar, we use the word 'subject' to talk about the pronoun, noun, or noun phrase that does the action of the verb. In English, the subject is usually before the verb.
• In grammar, we use the word 'object' to talk about the thing or person that the verb is done to, or who receives the verb. It can be a noun, a noun phrase, a pronoun, or a longer complex object, which is modified (in a similar way to a complex subject).

•  I suggest that we all watch the movie ‘TIGER’. Here, 'I' is the SUBJECT and the movie 'TIGER' is the OBJECT.
• It has been suggested that we watch the movie 'TIGER' together. Here, 'WE' is the SUBJECT and the movie 'TIGER' is the OBJECT.
• These two statements are explaining the role of object and subject.

Thus, it is concluded that The two given statements can be differentiated by drawing students’ attention to the roles of the subject and object in both sentences.

Reading is a process whereby a reader brings meaning to and gets meaning from print. This implies that readers bring their experiences as well as their emotions into play in order to derive meaning from text. 

• Reading for meaning is the activity we normally engage in when we read books, journals, newspapers, etc.
• It involves looking at sentences in a text and understanding the message they convey, in other words, making pause of a written text.

•  ​Rapid or Speed reading is the process of rapidly recognizing and absorbing phrases or sentences on a page all at once, rather than identifying individual words.

Purpose of rapid reading:-

• To increase speed without loss of comprehension.
• To increase self-confidence, eye span, vocabulary, and flexibility.
• To create interest in reading i.e., students will read stories, novels, and books of their choice.
• To overcome vocalization i.e., to speak the words while reading. So, the students who face difficulty in pronunciation can easily do rapid reading.

​Thus, from the above-mentioned points, it is clear that the purpose of 'rapid reading' is for interest.

 Skimming and scanning are methods of rapid reading.

• Skimming means glancing rapidly through a text to find out its general content, central idea, or gist.
  • We do this, for example, when we want to find out whether a certain article is relevant to our own area of study or research, or when we glance over a page of the newspaper to see if there is anything worth reading in detail, or when we go through a book to find out its subject matter.
• Scanning, on the other hand, mean darting over much of a text to search for a specific item or piece of information that we wish to discover. This skill also involves the ability to reject or pass over irrelevant information.
  • It is the kind of reading we do when, for example, we read through a biographical account to find out the date on which a certain event happened, 

CCE (Continuous and Comprehensive Evaluation) the flagship project of CBSE has clearly outlined the significance of speaking and listening skills as part of co-scholastic areas of achievement by every learner and also stresses the clear integration of assessment of speaking and listening skills as a part of the curriculum transaction.

During this exchange, while assessing students' speaking - listening skills, mark/s would be deducted for the first speaker, as the question is framed incorrectly.

• A modal verb is not used appropriately. Modal verbs are auxiliary verbs (also called helping verbs) like can, will, could, shall, must, would, might, and should. Modal verbs add meaning to the main verb in a sentence by expressing possibility, ability, permission, or obligation.
• Can and may can both be used to ask for permission, although "may" is considered more formal. 
• Thus. instead of the modal verb 'can', the speaker should have used the modal verb 'may'.
• The correct sentence would be May I borrow your pencil, please?

• The Listening Comprehension section tests the student’s ability to listen for basic interpersonal, instructional, and academic purposes. A number of sub-skills need to be developed in the everyday classroom transaction. The Listening Assessment comprises a variety of tasks. These tasks are graded according to the length of the task and the difficulty level.
• The Speaking skill had acquired a very important place as a communication skill. Like listening skills, a number of sub-skills of speaking need to be consciously developed among students.

Thus, it is concluded that Speaker 1: Can I borrow your pencil, please?

Speaker 2: Why not?

During this exchange, while assessing students' speaking-listening skills, mark/s would be deducted for the first speaker, as the question is framed incorrectly.

a) Placenta

The placenta is a cushion like tissue which supports the embryo and facilitates the supply of oxygen and nutrients to the embryo and also the removal of carbon dioxide and excretory waste materials produced by the embryo. It also acts as an endocrine tissue and produces several hormones like human chorionic gonadotropin, human placental lactogen, estrogens, progesterone, and relaxin etc.

Leaves and young shoots of coca plant.

CCE (Continuous and Comprehensive Evaluation), the flagship project of CBSE has clearly outlined the significance of speaking and listening skills as part of co-scholastic areas of achievement by every learner and also stresses the clear integration of assessment of speaking and listening skills as a part of the curriculum transaction.

During this exchange, while assessing students' speaking - listening skills, mark/s would be deducted for Speaker II as:

• as he has not responded to the question properly.
• He has only provided the answer in one word.

• ​The Listening Comprehension section tests the student’s ability to listen for basic interpersonal, instructional, and academic purposes.
• A number of sub-skills need to be developed in the everyday classroom transaction. The Listening Assessment comprises a variety of tasks. These tasks are graded according to the length of the task and the difficulty level.
• The Speaking skill had acquired a very important place as a communication skill. Like listening skills, a number of sub-skills of speaking need to be consciously developed among students.

Thus, it is concluded that during the assessment of students' speaking-listening skills, mark/s would be deducted during this exchange for the second speaker.

The word cryo comes from the Greek word "kayos" meaning "frost". It means preservation in a "frozen state". It is the process of cooling and storing cells, tissues, or organs at very low temperatures to maintain their viability. Cryopreservation is a technique in which low temperature is used to preserve the living cells and tissue. In this technique, tissues can be preserved for a very long time. The science that deals with cryopreservation is known as “cryobiology”.

Student 1: -1-

Student 2: -1-

Student 3: -0-

A modifier describes, clarifies, or gives more detail about a concept. 

• A dangling modifier is a word or phrase that modifies a word not clearly stated in the sentence.
  • Dangling modifier: Student 1 — Having arrived late for practice, a written excuse was needed.
    Who arrived late? This sentence says that the written excuse arrived late. To revise, decide who actually arrived late.
    Example: Having arrived late for practice, Rahul Doer needed a written excused.
  • Dangling modifier: Student 2- Without knowing his name, it was difficult to introduce him. 
  • Who didn't know his name? 
    This sentence says that “it” didn't know his name. To revise, decide who was trying to introduce him.
    Example: Since Jayanti doer didn’t know his name, it was difficult to introduce him.
  • Student 3: The experiment was a failure, not having studied the lab manual carefully. This sentence is not an example of dangling modifiers.

Hence, student 1 and student 2 provide correct examples of dangling modifiers used in these sentences. Thus, the score for both of them is 1 and for student 3 is 0.

Cryopreservation – Cryopreservation is in vitro conservation technique useful for preserving vegetatively propagated crops eg, potato, seeds of plants and preserving sperms, eggs, cells and embryonic tissues of animals at –196°C temperature. 

Interferons activate immune system and helps in destroying the tumor.

When in atmosphere harmful changes happen due to different types of radiations and radioactive materials then it is called radiation pollution. It is the physical pollution of air, water and soil with radioactive materials. It is natural as well as man made. The effect of radioactive pollutants depend on (i) strength of radiation, (ii) rate of diffusion and deposition of the pollutants, (iii) the length of time for which the tissue is exposed to radiation, and (iv) half life of pollutants. Environmental factors also influence their effects. 

Effect of radiation pollution:– 

(1) Due to radiation pollution, body becomes weak and life becomes short. 

(2) Radiation pollution is harmful for DNA, RNA, Protein, Spleen, etc. 

(3) Radioactive radiations cause sterility, defect vision, tumour of lungs, loss of tissues, etc. 

(4) Long time exposure in ultraviolet radiations causes skin related diseases. 

(5) For long time or time-to-time radiation of radioactive materials may cause blood cancer or leukaemia. 

(6) Cells vary in their sensitivity to injury by radiation. 

(7) Chances of depletion of ozone layer in stretosphere by nuclear explosions. 

Biopsy, CT Scan and MRI.

Deforestation is the conversion of forest areas to non-forest ones. It is a serious threat to the quality of life, national economy and future of environment. According to an estimate, almost 40 percent forests have been lost in the tropics, compared to only one percent in the temperate region. The present-scenario of deforestation is particularly grim in India. 

The main cause of decrease in forest cover in India is deforestation due to expansion of agriculture, urbanization, industrialization, excessive commercial use of timber, fuel, wood etc. The causes of deforestation are population explosion, fires, pests, grazing and gnawing mammals, weather, jhum cultivation, etc. Effects of deforestation are as follows– 

(1) Soil erosion has increased; 

(2) Flood and droughts have become more frequent; 

(3) Pattern of rainfall is changing; 

(4) Landslides and avalanches are on the increase; 

(5) Climate has become warmer; 

(6) Forest dwelling species are becoming extinct; 

(7) Consumption of CO₂ and production of O₂ are getting adversely affected. 

The human pregnancy lasts 9 months. After one month of pregnancy, the embryo’s heart is formed. By the end of the second month of pregnancy, the foetus develops limbs and digits. By the end of 12 weeks (first trimester), most of the major organ system are formed. The limbs and the external genital organs are well developed. The first movement of the foetus and appearance of hair on the head are usually observed during the fifth month. By the end of 24 weeks (second trimester) the body is covered with fine hair, eye lids separate and eyelashes are formed. By the end of 9 months of pregnancy, the foetus is fully developed and is ready for delivery. 

The fatal disease like cancer must be identified in its early stage so that it can be easily diagnosed properly and well in time. Following test methods are employed for the identification of cancer– 

(a) Through biopsy of cancerous tissue. 

(b) Blood and bone marrow test for growth of cancerous cells. 

(c) Cancer of internal organ identified by radiography, CT-computed Tomography and MRI (Magnetic Resonance Imaging). 

(d) Use of antibody angainst specific cancer antigens. 

(e) By identification of oncogens through bio-molecular technique. 

Answer (A) Bone marrow

Answer (B) Aquatic animals

Animal husbandary is related to animal stocks such as Buffalo, Cow, Pig, Horse, Camel, Goat etc and their reproduction and care which is necessary for production of food for human. 

The increasing global population, increase in food production is a essential demand. This animal husbandry provide milk, meat and woolen for clothing for humanity. Animal husbandry, animal reproduction and growth of animal stocks is a system in agriculture. 

To fulfil the increasing demand of food for humanity, animals and animal products are essential. Therefore animal husbandry is important for human welfare. Utilizing various scientific principles, care of domestic animals & their reproductive processes in context of human welfare are reformed. 

(B) Aquatic animals

Animal husbandry is the agricultural practice of breeding and raising livestock. As such it is vital skill for farmers and is as much science as it is art. It deals with the care and breeding of livestock like buffaloes, cows, pigs, horses, cattle, ship camels goat etc that are useful to humans. It also includes farming and fisheries. Since time, animals like bees, silkworm, prawns, crabs, fishes, birds, pigs, cattle, sheep and camels have been used by human for products like milk, eggs, meat, wool, silk, honey, etc. Breeding of animals is also an important aspects of animals husbandry which aims at increasing the yield of animals and improving the desirable qualities of the produce.

Answer (a) Thymine and Cytosine

Answer (C) 1 : 2 : 1

The phenotypic ratio for F₂ generation in Incomplete dominance is 1:2:1

Biofertilizers are micro-organisms which bring about nutrient enrichment of soil by enhancing the availability of nutrients to crops. The micro-organisms which act as Bio-feretilizers are bacteria, cyano bacteria and mycorrhizal fungi. bacteria and cyanobacteria have the property of Nitrogen fixation while mycorrhizal fungi withdraw minerals from organic matter for the plant with which they are associated.

Rhizobium fix atmospheric nitrogen into organic forms through nodules on the roots of leguminous plants, which is used by plant as nutrient. Fungi are also known to form symbiotic associations with plants (i.e. mycorrhiza)

Cyanobacteria are auto trophic microbes widely distributed in aquatic and terresterial environments, many of which can fix atmospheric nitrogen, e.g., Anabana, Nostoc etc.

Biofertilizers are Biological in nature and so are biodegradable. They do not spoil the quality of the soil. It supplies organic matter and additional nitrogen like Rhizobiom, Azotobactor etc.

Answer (A) Soil

(B) Mortality

(a) Micro-mutation: It is also called point mutation or single base mutation is a type of mutation that causes the replacement of a single base nucleotide with another nucleotide of genetic material, DNA or RNA.

(b) Macro-mutation: A mutation that has profound effect on the resulting organism, as a change in a regulatory gene that controls the expression of many structural genes.

(c) Cromosomal mutation: Any event that changes genetic structure any alternation in the inherited nucletic acid sequences of the genotype of an organism.

3x² + 2√2 x - 2 = 0

⇒ 3x² + 3√2 x - √2x - 2 = 0

⇒ 3x(x + √2) - √2(x + √2) = 0

⇒ (3x - √2) (x + √2) = 0

⇒ x + √2 = 0 or 3x - √2 = 0

⇒ x = -√2 or x = √2/3.

Hence, -√2 and √2/3 are zeros of the quadratic equation 3x² + 2√2 x - 2 = 0

Apiculture or Bee-keeping is the rearing of honey bees for the production of honey. It has been an age-old cottage industry. Honey is a food of high nutritive value and also finds use in the indigenous systems of medicine. Honeybee also produces beewax, which finds many uses in industry, such as in the Preparation of cosmetics and polishes of various kinds. The increases demand of honey has led to large scale bee-keeping practices. It has become an established income generating industry, whether practiced on a small or on a large scale.

Bee-keeping can be practiced in any area where there are sufficient bee postures of some wild shrubs, fruits orchards and cultivated crops. Apis indica is the most common species which is domesticated easily.

The following points are important for successful bee-keeping:

(a) Knowledge of the nature and habits of bees

(b) Selection of suitable location for keeping the beehives

(c) Catching and hiving of swarms (group of bees)

(d) Management of beehives during different seasons and

(e) Handling and collection of honey & beewax

Properties of genetic code-

(i) It is triplet: The three nucleotides of mRNA which code for one amino acid represent codon. Complementary matching triplet of tRNA from the anticodon. The codon which intiates protein synthesis is called as initation codon.

(ii) The code is degenerate: For a particular amino acid more than one codon can be used. One amino acid often has more than one code triplet.

(iii) The genetic code is universal: Given codon in DNA and mRNA specifies same amino acid in all organisms like prokaryotes virus.

(iv) The code is non-overlapping: It meals that same letter cannot be used for two different codons. Each nitrogenous base is present in one codon only.

(v) Co-linearity: The genetic code represents the sequence of mRNA codons and the corresponding amino acid residues of a polypeptide chain are arranged in the same linear sequence.

Geological time scale:

GTS is chronological measurement that relates stratigraphy to time, and is used by geologists, paleontologists, and other earth scientist to describe the timing and relationships between events that have occurred throughout earth's history.

The name of eras are following:

(i) Cenozoic

(ii) Mesozoic

(iii) Paleozoic

(iv) Neo-proterozoic

(v) Meso-proterozoic

(vi) Paleoproterozoic