Bihar STET Paper 1 Science Mock Test - 10 - Bihar PGT/TGT/PRT MCQ

Advanced sunrise and delayed sunset are phenomena caused due to atmospheric refraction. In this the sun appears to rise early by 2 minutes and set late by 2 minutes. 
A rainbow is a meteorological phenomena that is caused by total internal reflection refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky.
 

Presbyopia is a condition associated with the aging of the eye that results in progressively worsening ability to focus clearly on close objects.

Calcium carbonate reacts with sulphuric acid to form calcium sulphate and carbon dioxide which turns lime water milky.

CaCO₃ + H₂SO₄ → CaSO₄ + CO₂ + H₂O

An artificial kidney can be used for dialysis in case of kidney failure.

When a liquid is heated, it eventually reaches a temperature at which the vapor pressure is large enough that bubbles form inside the body of the liquid. This temperature is called the boiling point

Eye lens is convex, in nature. So, image formed by it on the retina is real and inverted.

The chemical formula for Plaster of Paris is CaSO₄. ½ H₂O. When gypsum is heated to a certain temperature, it undergoes a reaction to yield CaSO₄. ½ H₂O, which is the compound that forms Plaster of Paris. This compound indicates that two units of CaSO4 share one molecule of water, giving it its specific chemical composition.

The chemical symbol for gold is Au, taken from the Latin word for gold- Aurum. Its atomic number is 79.

The urinary bladder is muscular and stores urine until the pressure from the accumulated urine triggers the urge to urinate, at which point it is expelled.

1. Autotrophs are the organisms that prepare their own food, whereas, heterotrophs are the organisms that are dependent on other organisms for food.

2. Autotrophs have chlorophyll, whereas, heterotrophs lack chlorophyll.

Tubes with semi-permeable lining perform dialysis of waste products in artificial kidneys.

We know that ,K = °C + 273.15
= 373 deg C + 273.15 deg C 
= 646.15 deg C

Elements include metals, non-metals and semi-metals (metalloids). Alloys are mixture of two or more elements.

The pressure from sound waves makes the eardrum vibrate. The vibrations are transmitted further into the ear via three bones in the middle ear: the hammer(malleus), the anvil (incus) and the stirrup (stapes).

The Barr body, also sometimes called the sex chromatin, is the inactive X chromosome in female somatic cells. Human females have two X chromosomes, while males have one X and one Y. In all of the female somatic cells, which don’t take part in sexual reproduction, one of the X chromosomes is active.

The greater the valency of the element, the greater is its unreactivity. Also, the valency in a period increases from the left to the middle, then again decreases from middle to the right. So we can say that the unreactive elements are located in the center of the period. Since phosphorus and Silicon are located at the center, they have the highest number of Valence electrons, and hence are the most unreactive in the period.

Factors Affecting Rate of Evaporation

- Wind Speed: Higher wind speeds can increase the rate of evaporation by removing the saturated air above the liquid surface, allowing more water molecules to evaporate.
- Surface Area: A larger surface area exposed to the air can increase the rate of evaporation as more water molecules are available to escape into the air.
- Temperature: Higher temperatures can increase the rate of evaporation as they provide more energy to the water molecules, allowing them to overcome the intermolecular forces holding them in the liquid phase.

Insoluble heavy impurities do not affect the rate of evaporation as they do not impact the ability of water molecules to escape into the air. These impurities do not alter the physical properties of water that determine its evaporation rate.

The instructions of a teacher must be based on the child's abilities, aptitude and interest. His ability to grasp and apply things, his natural ability to justify learning and his interest to learn a particular thing could decide the teaching strategies, as the education these days has become more child-centered. The teacher must be aware of the child's abilities, aptitude, and interest, which is possible only through proper evaluation.

A teacher should take care of each child irrespective of their disabilities. He/she should ensure the students' maximum potential. Everyone has the right to education. A teacher should ensure that his/her students derive maximum benefit from education. 
Teachers must be aware of the fact that every child is different from each other. The differences occur from physical characteristics to learning styles. The objective of education is to provide the fullest possible development of learners. The teachers should find out the different strengths and weaknesses of students before their disabilities.
Hence, the correct answer is, 'Mohan, why don't you use your crutches to go to the playground?'

Best speech habits are developed in language labs. Thus, to develop good speech habits in the learners, he should exploit language labs. Language labs involve students in language learning exercises more actively and also let them participate more as compared to a traditional classroom setting.

Activity-based learning is a ‘learner-centred’ approach in the teaching-learning process. In this approach, the ‘learner’ or ‘child’ and not the ‘teacher’ is the main focus of the educational program. It emphasizes ‘learning’ rather than ‘teaching’.

• Activity-based learning integrates multiple methods of teaching like Demonstration, Role-play, Brainstorming, Project method, Debate, etc.
• Activity-based learning brings the real issues and problems from day-to-day life in classroom settings.
• It provide provides opportunities to apply multiple senses.
• It includes all objects, events, natural phenomena and social surroundings in the teaching-learning process.
• It clarifies abstract concepts, develops concrete thinking and brings reality in real settings.
• During activity-based learning, the learners use his/her multiple senses to understand the concepts and enhance learning.
• It arouses the child’s interests, abilities, and needs during the learning process.

Hence, we conclude that all the above points are the advantages of the activity-based learning.

The Right Of Children To Free And Compulsory Education Act (RCFCE Act - 2009) is briefly known as the Right To Education Act (RTE - 2009). 

• Its main aim is to provide quality elementary education to all children.
• It enforces Education as a Fundamental Right (Article 21).

​Key Points

• RTE act aims to provide primary education to all children aged 6 to 14 years from class 1st to class 8th.
• Non enrolled/drop-out children be admitted to an age-appropriate class after a period of Special Training.
• No child shall be failed or expelled from school up to class VIII (corresponds to the age group 6-14) under the no-detention policy.
• It emphasized banning corporal punishment, continuous and comprehensive evaluation, making schools and classrooms truly inclusive, and so on. 
• The role of a teacher to conduct the teaching-learning activities in such a way that it helps the child to be free of fear, trauma, and anxiety and helping the child to express views freely.
• The teacher should demonstrate gender equality in the classroom to remove the gender stereotypes among children and to provide equal opportunities to all irrespective of their gender.
  • The teacher shouldn't follow gender biases like Girls can perform well in dance, music, and arts while boys are generally good in science and mathematics.
• The teacher should follow a child-centred approach to meet the needs and learning goals of learners.
• When the child-centred approach is used in the teaching-learning process, then the child participation will automatically increase as they will take interest in learning.

So, one of the important roles of the teacher according to the RTE is to demonstrate Gender Equality.

Sunita's experiences have been used to give children a sense of Earth's gravity. Children are made to understand about the pull of Earth.

A, B and D are the correct options because we can write only because of friction between the tip of the pen and the paper. We can walk because of the friction between our feet and the ground. We are able to stop a moving vehicle by applying brakes because of friction.

The logic follows here : 
1. Sukhoi Su-30MKI is a Fighter Jet.
2. INS Vikrant is different from these two, it is an Aircraft Carrier.

The least possible Venn diagram for the given set of words is :

Hence, the correct answer is "Option (4)".

Additional Information

INS VIKRANT

• INS Vikrant is a 37,500-tonne carrier and has been launched almost four-and-a-half years after its keel was laid.
• The launch of warship, which has a length of 260 metres and is 60 metres wide.
• The launch has marked India's entry into a select club of countries capable of designing and building a carrier of this size and capability.
• There are 14 decks in all, including five in the superstructure. The ship has over 2,300 compartments, designed for a crew of around 1,700 people, including specialized cabins to accommodate women officers.
• There are 14 decks in all, including five in the superstructure. The ship has over 2,300 compartments, designed for a crew of around 1,700 people, including specialized cabins to accommodate women officers.

Sukhoi Su-30MKI

• The Sukhoi Su-30MKI is a twinjet multirole air superiority fighter developed by Russia's Sukhoi and built under license by India's Hindustan Aeronautics Limited (HAL) for the Indian Air Force (IAF). A variant of the Sukhoi Su-30, it is a heavy, all-weather, long-range fighter.
• The IAF has nearly 260 Su-30MKIs in inventory as of January 2020.
• Based on the Su-30 fighter aircraft, Su-30MKI is equipped with thrust vectoring control and canards.
• The aircraft has a length of 21.9m, wingspan of 14.7m and a height of 6.4m.
• The maximum take-off weight of Su-30MKI is 38,800kg.
• The Su-30MKI is also equipped with a N011M passive electronically scanned array radar, OLS-30 laser-optical locator system and Litening target designation pod to guide air-to-surface missile and laser guided munitions.
• The Su-30MKI is armed with a 30mm Gsh-30-1 cannon with 150 rounds of ammunition.
• The Su-30MKI fleet of IAF was fitted with air-launched version of BrahMos supersonic cruise missiles and was successfully tested in November 2017.
• The BrahMos can strike targets within the range of 290km.
• The IAF completed the successful integration of the cruise missile on the fighter, with the third live firing of the missile from the aircraft in December 2019.

The logic follows here is:

Middle number = square root of first number + third number.

Row-wise operation :

(25, 41, 36)

middle number = 41

= √25 + 36

= 5 + 36

= 41

(49, 45, 38)

middle number = 45

= √49 + 38

= 7 + 38

= 45

Similarly

(36, ?, 62)

middle number = ?

= √36 + 62

= 6 + 62

= 68

Hence, the correct answer is "68"

Additional Information

The most common pattern asked in exams are based on:

• It could be the sum of two numbers divided by a constant
• It could be the average of numbers.
• It could be in the form of alphabets, where alphabets are increased by constant or increased by the square of numbers or increased by prime numbers.
• It could be the difference of product of two diametrically opposite numbers.
• It could be the difference in the sum of adjacent numbers.
• The difference of the numbers could be in the patterns 13 ± 1, 23 ± 1,  and so on.
• The difference of the numbers could be in the patterns 12 ± 1, 22 ± 1, and so on.
• Numbers could be 12, 22, 32, and so on or 13, 23, 33, and so on.
• The difference could be prime numbers or the difference could be the square of prime numbers.
• The difference could be in the form of N2 ± N or N3 ± N.
• The difference could be in the form of ×N + N or ×2 + 1, ×2 + 2, ×2 + 3, and so on.
• The difference could be in the form of ×2 ± 1 alternatively.
• Numbers could be ×1, ×2, ×3, and so on. 

Preparing the family tree using the following symbols:

On decoding L θ Z β T means L is the mother of Z and Z is the sister of T.

i) L is mother of T → True
ii) L is father of T → False (as L is mother of T) 
iii) T is father of L → False (as T is either son or daughter of L)
iv) Z is daughter of T → False (as Z is sister of T)
Hence, 'L is mother of T' is the correct answer.