Bihar STET Paper 1 Science Mock Test - 9 - Bihar PGT/TGT/PRT MCQ

As we move down a group in the periodic table, the tendency to lose electron increases.
Also when we move from left to right in a period, the tendency to lose electrons decreases. Combining these two results, K will lose the electron most easily.

The valency of Calcium of 2+. Calcium has 2 electrons in its outermost shell, its electronic configuration being (2,8,8,2). In order to attain stability it loses 2 electrons to become stable according to the octet rule.

To determine the proportion of dwarf progeny, let's analyze the cross between a heterozygous tall plant (Tt) and a homozygous dwarf plant (tt).
Genotype of tall plant: Tt
Genotype of dwarf plant: tt
When these two plants are crossed, the possible genotypes of the progeny are as follows:
1. Tt (tall)
2. Tt (tall)
3. tt (dwarf)
4. tt (dwarf)
From these genotypes, we can see that 2 out of 4 possible genotypes (50%) will result in dwarf progeny.
Therefore, the proportion of dwarf progeny is 50% (option A).

Rutherford's scattering formula fails for very small scattering angles because due to the strong repulsive force present between the α-particles and the nucleus and also the full nuclear charge of the target atom is partially screened by its electrons.

Answer:
The metalloid elements are those that have properties of both metals and nonmetals. They are located along the zigzag line on the periodic table. Among the options given, the metalloid element is:
A: Si (Silicon)
- Silicon is a metalloid element.
- It is a solid at room temperature.
- It has a shiny luster like metals.
- It is a good conductor of electricity like metals.
- However, it is brittle and semiconductor in nature like nonmetals.
- It is commonly used in the production of computer chips and solar cells.
B: Sb (Antimony)
- Antimony is not a metalloid element.
- It is a metallic element.
- It is a solid at room temperature.
- It has a metallic luster and is a good conductor of electricity.
D: Zn (Zinc)
- Zinc is not a metalloid element.
- It is a metallic element.
- It is a solid at room temperature.
- It has a metallic luster and is a good conductor of electricity.
Therefore, the correct answer is C: A and B (Si and Sb) as both Silicon and Antimony are metalloid elements.

Mitochondria are called as power house of the cell because it contain enzymes for cellular respiration in which energy is released in form of ATP.

Sodium is stored under kerosene because of its high chemical reactivity with almost all of other elements (for example oxygen from air which oxidizes it instantly). Kerosene and mineral oil are the only chemicals that make the sodium inert.

The trapping of heat in the environment due to the presence of greenhouse gases like CO₂, methane, water vapour etc is the greenhouse effect. This raises the temperature of the earth.
In the solar cooker the same process occurs, the sun rays are reflected by the mirror are trapped in the solar cooker by the glass plate (green house effect) and is used to heat the food.

China Clay is also known as kaolin & white clay. Primary clay formed by natural kaolinisation process. it is formed by decomposition of some part of feldspar mineral.White in color , Used in ceramic slip casting process, Pressing processes and forming process as a body former and filler.

A drone is a male bee. Unlike the female worker bee, drones do not have stingers and gather neither nectar nor pollen. A drone's primary role is to mate with an unfertilized queen.

The primary function of respiratory organs in animals, as outlined is the exchange of respiratory gases. These organs have specialized structures that facilitate the diffusion of gases, such as oxygen and carbon dioxide, to meet the metabolic demands of the organism. This process is essential for cellular respiration and energy production within the body.

Euro I and Euro II are norms for vehicle emissions.
Explanation:
Euro I and Euro II are specific standards or norms that regulate the emissions from vehicles. These norms were introduced in Europe to control and reduce the pollution caused by vehicle exhaust. Here is a detailed explanation:
- Euro I:
- Euro I is the first set of emission standards for vehicles, which were introduced in 1992.
- These standards set limits on the levels of pollutants, such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx), emitted by vehicles.
- Euro I aimed to reduce pollution caused by vehicles and improve air quality.
- Euro II:
- Euro II is the second set of emission standards for vehicles, which were introduced in 1996.
- These standards further tightened the limits on CO, HC, and NOx emissions compared to Euro I.
- Euro II aimed to further reduce pollution and improve the environmental performance of vehicles.
- Benefits of Euro I and Euro II:
- These emission norms have helped in reducing air pollution and improving air quality in Europe.
- They have encouraged the development and adoption of cleaner and more efficient vehicle technologies.
- The implementation of Euro I and Euro II has also prompted advancements in emission control systems and catalytic converters in vehicles.
In conclusion, Euro I and Euro II are norms specifically designed to regulate and control the emissions from vehicles. They have played a significant role in reducing pollution and improving the environmental performance of vehicles in Europe.

Sodium hydroxide, also known as caustic soda, is one of the compounds that can be created from common salt, sodium chloride (NaCl). It is a strong base with various industrial and household applications, including in soap making, paper production, and water treatment.

Graphite can conduct electricity because in graphite every carbon atom is bonded to 3 other carbon atoms and has 1 free electron. This free electrons help in conducting electricity.

Bifocal lenses are the lenses which are used for the people who suffer from both defects of vision that are hypermetropia and myopia, for those people who suffer from presbyopia or astigmatism. These lenses have two distinct powers and hence they serve two functions :- one is for distant vision and the other is for near vision. The lenses are divided into two parts. The upper part consists of concave lens which serves for distant vision at the lower part consists of convex lens which serves for near vision.

Benzene is C₆H₆ an aromatic compound in the form of a closed ring. It contains alternate double and single bond.

Hormone, secretin: Hormone made by glands in the small intestine that stimulates pancreatic secretion. The word "hormone" was coined by the English physiologists Wm. M. Bayliss and Ernest H. Starling in connection with their discovery of secretin, the first hormone, in 1902.

A good text book does not have flowery language. It has a plain and simple language, which the students can easily understand. Flowery language cannot be understood by everyone easily and because text books are common for both intelligent and weak students, it is important for a text book to have simple language.

Resource plays a vital role in the teaching-learning process. In education, the meaning of resource is any device, object, or machine used by a teacher to clarify or enliven a subject. It can also be viewed as material and equipment used in the teaching-learning process.

Key Points Improvised resources:

• Improvised resources are very important and every teacher should be equipped with them. Often, language teachers complain, what they can use in the classroom as resources.
• There is a very limited scope of using the resource in classroom teaching. In such conditions, they can use improvised resources during their class.
• The meaning of improvisation is the ability to take existing pieces and put them together in a new combination for a purpose. Improvisation is an element of creativity and resourcefulness.
• In improvisation, we use local resources in our immediate environment to build, construct, mold or make instructional teaching-learning materials that can assist in the smooth dissemination and transfer of knowledge from teachers to learners. 
• In the present scenario, improvisation has become crucial in the teaching-learning process because the economic situation makes the cost of facilities and equipment very high amidst decreasing or near lack of purchasing power.
• Improvisation reveals that there are possibilities for alternatives to teaching and learning aids. It should therefore meet specific teaching and learning situations. 

Hence, it is clear that Improvised Resources ensures the use of alternative resources to facilitate instructions for teaching wherever there is a lack or specific firsthand teaching aids.

Additional Information

• Multimedia is defined as digital resources or technology of communication, constituted by the sum of Hardware and Software. The use of multimedia in the educational field impacts positively the development of instruction and also the methods by which teachers give information to students.
• Visual resources are designed to influence the eyes of learners to enable them to understand what is being shown. In language learning, visual aids are helpful in developing language skills such as speaking and writing as they stimulate learners’ sense of sight.
• Community resources provide first-hand experiences to the child and s/he is able to develop proper concepts about various aspects of processes of community life.

In education, teaching is the concerted sharing of knowledge and experience, which is usually organized within a discipline and, more generally, the provision of stimulus to the psychological and intellectual growth of a person by another person or artifact. The steps are in the following order:
(iv) Formulating instructional objectives
(i) Relate the present knowledge with previous one
(v) Presentation of instructional materials
(ii) Evaluation
(iii) Reteaching

Formative evaluation refers to a wide variety of methods that teachers use to conduct in-process evaluations of student comprehension, learning needs and academic progress during a lesson, unit or course.

Iceland is on high alert as an unprecedented seismic swarm, with 800 earthquakes in 14 hours, has raised concerns about a possible volcanic eruption in the Reykjanes peninsula. The Iceland Met Office has warned of a "considerable" likelihood of a volcanic eruption in the coming days, leading to the declaration of a state of emergency.

India is ranked 64th out of 108 countries in the GRWI, reflecting a significant decline of 15 places from the previous year. Meanwhile, The top 5 countries which scored the highest on the Global Remote Work Index (GRWI) are Denmark, Netherlands, Germany, Spain and Sweden.

King Charles III is the monarch depicted on the new UK banknotes, which will co-circulate with those featuring Queen Elizabeth II's portrait starting from June 5, 2024.

India along with 10 ASEAN Member States (AMS) were represented by 200 participants, at the 4th edition of the annual ASEAN India Grassroots Innovation Forum (AIGIF) that was launched in Langkawi, Malaysia.
The AIGIF is an annual programme focused on fostering a strengthened relationship between India and AMS on the premise of cooperation in Science, Technology and Innovation (STI). Department of Science & Technology (DST) and National Innovation Foundation (NIF) of India and the Science and Technology Ministry of the host nation, Malaysia collaborated for the event.

The Silicon Valley of India is a nickname of the Indian city of Bangalore. The name signifies Bangalore as a hub for information technology companies in India. It is a reference to the original Silicon Valley of the San Francisco Bay Area, which is the major hub for information technology companies in the United States.

The side of the square must be the same as the breadth of the rectangle.
Side of the square = 4 meters
So the answer = 4 × 4 = 16 m²
Hence, Option D is correct.

The logic follows here is :-

From the given words we can understand that it is a process of construction or a materials.

Planning → Designing → Implementation → Manufacturing → Production 

So, logical and meaningful order is 4 - 1 - 5 - 2 - 3

Thus, the correct answer is "4 - 1 - 5 - 2 - 3".

The pattern followed is:

Hence, the correct answer is "110".