Bihar STET Paper 2 Chemistry Mock Test - 2 - Bihar PGT/TGT/PRT MCQ

= 65.223J/K/mole

(i) → (r,s), (ii) → (p,q,t), (iii) → (p,q,t), (iv) → (r,s)

X is a primary, chiral alcohol.

On addition of H₂/Pd/CaCO₃
we get H-CH=C-CH₂-CH₂-CH₃ 
H-CH=C-CH₂-CH₂-CH₃ + NBS/CCl₄   →   H-CH=C-CHCl-CH₂-CH₃  (NBS adds Br to carbon at next alternate to double bond)
H-CH=C-CHCl-CH₂-CH₃ + KOH/EtOH  →  H₂C=C-CH=CH-CH₃
(by E₂ elimination)

The correct answer is option B
Let 
P = x_x​P_x⁰ ​+ x_y​P_y0

on solving for P_y⁰​ and P_x⁰​
We get,
P_x⁰​ = 400 mm of Hg
P_y⁰ ​= 600 mm of Hg

The correct answer is option C
 3A ➡ 2B

Thus, the order of reaction with respect to A = 1
The order of reaction with respect to B =1
Total order of reaction = 1+1 = 2

Oxidation Numbers in Oxygen Difluoride (OF₂) and Dioxygen Difluoride (O₂F₂)

Oxidation numbers are assigned to elements in compounds according to several rules. Here, we'll use the rule that states the oxidation number of fluorine (F) in a compound is always -1, and the rule that states the sum of oxidation numbers of all atoms in a compound is 0.

Oxidation Number in OF₂:

• In Oxygen Difluoride (OF₂), there are two fluorine atoms, each with an oxidation number of -1. So, the total oxidation number contributed by fluorine is -2.
• To mak e the total oxidation number 0, the oxygen atom must have an oxidation number of +2.

Oxidation Number in O₂F₂:

• In Dioxygen Difluoride (O₂F₂), there are two fluorine atoms, each with an oxidation number of -1. So, the total oxidation number contributed by fluorine is -2.
• There are also two oxygen atoms. To make the total oxidation number 0, the combined oxidation number of the two oxygen atoms must be +2.
• Therefore, the oxidation number of each oxygen atom in O₂F₂ is +1 (because +2 divided by 2 equals +1).

So, in OF₂ and O₂F₂, the oxygen is assigned an oxidation number of +2 and +1, respectively. Therefore, the correct answer is B: +2 and +1.

All isomeric esters are metamers.

According to option A chiral compound at least have one chiral carbon but compounds other than carbon and also chiral like NCl Br I is chiral. According to option b a compound containing only one ka kalakaron is always is always correct that is statement is true it is the minimum requirement for a carbon atom to become chiral. Efficiency is not necessary to be true all the time compound will not be superimposable on its Mirror image. And for option d a plane of symmetry is sufficient but not a mandatory to give achiral compound.

Smaller the IE of Mg, easier the formation of Mg²⁺.
Greater the EA of O, easier the formation of O2^-.

In a chemical reaction, chemical equilibrium is the state in which the forward reaction rate and the reverse reaction rate are equal. The result of this equilibrium is that the concentrations of the reactants and the products do not change. However, just because concentrations aren’t changing does not mean that all chemical reaction has ceased. Just the opposite is true; chemical equilibrium is a dynamic state in which reactants are being converted into products at all times, but at the exact rate that products are being converted back into reactants. The result of such a situation is analogous to a bridge between two cities, where the rate of cars going over the bridge in each direction is exactly equal. The result is that the net number of cars on either side of the bridge does not change.

The stage of the embryo which nearly resembles a human being is called a fetus. Learning starts at fetal stage when a child starts reacting to different stimuli, as the sense organs are developed by this time.
The fetal nervous system starts developing very early in pregnancy. The main subdivisions of the brain are, in a basic form, visible at five gestational weeks. At about gestational weeks 25-29, the fetus is even able to hear internal (e.g. from the maternal gastrointestinal system) and external sounds. So, obviously the fetus gets a vague idea from the external environment through its senses, far before birth. Some studies even demonstrate that fetal heart rate patterns change distinctively, depending on whether the unborn child is exposed to the maternal voice or another female voice.

NEP 2020 suggests a flexible higher education system with multiple entry and exit points, allowing students to choose their courses based on their interests and career goals.

In teaching field, the first and the foremost step any teacher should adopt is to understand the background of the students. This is because it will help the teacher to analyse the level of the students and will help him to deliver quality lectures to them. This can also help him in preparing the lecture and deciding the teaching aids to be used for the students.

Teaching is not affected by socio-economic background of students and teachers. Teaching is impartial.

Socialization is an important process for the functioning and continuation of society. It is a process of learning the rules, habits, and values of a group to which a person belongs whether it is family, friends, colleagues, or any other group.

NEP 2020 recommends the use of the mother tongue or local language as the medium of instruction for foundational education.

Howard Gardner's theory of multiple intelligences emphasizes the unique abilities of each individual that removes the idea of valuing intelligence as a single general ability for all. According to him, the learners should not be restricted to one modality of learning. As per his theory, intelligence is a physiological ability of processing information, activated in a cultural setting to reach the specific solution of a problem.
Hence, the correct answer is, 'The unique abilities of each individual.'

Madam Soni found that most of the students this year performed better in exams than the last year. This is because she improved the teaching methods, and thus, the students were able to understand better. This better understanding resulted in the improved performance of the students.

Mrs. Shalini is using a black board. A black board is a visual aid, thus Mrs.Shalini is using a visual aid. Visual aids, like the black board, are important teaching aids which can facilitate learning. The black board is the most basic and important visual aid for a classroom. Visual aids are visual communication of ideas and apart from black boards, other visual aids include PPTs, flip charts etc.

"Making errors is a shameful act for the learners". This statement is detrimental to student's learning.

Teacher's beliefs impact their teaching behaviour, learner development, guide their decision making and interactions with their learners. Beliefs help teachers from their planning, curricular decisions and identify what should be taught in the classroom.

Teachers’ beliefs are related to some factors that interact with each other in the processes of teaching and learning. Teachers bring beliefs acquired from many years of learning experiences to a teacher education that impacts what and how they learn to teach. Teachers’ beliefs affect what they say and do in the classroom which forms their beliefs. Teachers’ beliefs affect teacher awareness, teaching attitudes, and teaching methods. Teachers’ beliefs impact their teaching behaviour, and learner development, and guide their decision-making and interactions with their learners. Beliefs help teachers form their planning and curricular decisions and identify what should be taught in the classroom. On the whole, it can be concluded that teachers’ beliefs will have a great effect on forming active teaching methods and will bring about a considerable amount of advance in learners’ language capabilities.

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Xerophytes are plants which are adjusted to dry/desert zones. To survive these unforgiving conditions, they have uncommon elements. For instance, a desert plant has white hairs which avert water misfortune.

The planet Venus is also known as 'Earth's twin', the reason being that Venus and Earth are practically of the same size, with equivalent mass and have fundamentally the same arrangement of the same material. They are likewise neighbouring planets.

Perimeter of the wheel

Hence, Option B is correct.

The pattern followed is:

Top right number = multiplication of top left number and bottom number 

In fig 1:

729 = 81 × 9

729 = 729

In fig 2:

512 = 64 × 8

512 = 512

Similarly,

In fig 3:

? = 49 × 7

? = 343 

Hence, the correct answer is "343".