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OAVS TGT Science Mock Test - 2 - OTET MCQ


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30 Questions MCQ Test - OAVS TGT Science Mock Test - 2

OAVS TGT Science Mock Test - 2 for OTET 2025 is part of OTET preparation. The OAVS TGT Science Mock Test - 2 questions and answers have been prepared according to the OTET exam syllabus.The OAVS TGT Science Mock Test - 2 MCQs are made for OTET 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for OAVS TGT Science Mock Test - 2 below.
Solutions of OAVS TGT Science Mock Test - 2 questions in English are available as part of our course for OTET & OAVS TGT Science Mock Test - 2 solutions in Hindi for OTET course. Download more important topics, notes, lectures and mock test series for OTET Exam by signing up for free. Attempt OAVS TGT Science Mock Test - 2 | 100 questions in 100 minutes | Mock test for OTET preparation | Free important questions MCQ to study for OTET Exam | Download free PDF with solutions
OAVS TGT Science Mock Test - 2 - Question 1
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Chemical formula of a compound is A2B3. The valency of A is

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OAVS TGT Science Mock Test - 2 - Question 2
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Reabsorption of useful substances from glomerular filtrate occurs in :-

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The cells lining the proximal convoluted tubule are well adapted for reabsorption of materials from the filtrate. The cells reabsorb entire glucose, amino acids, most of the inorganic ions (Na+, K+, Cl ), much of the water as well as some urea from the filtrate.

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OAVS TGT Science Mock Test - 2 - Question 3
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U-235 will undergo fission by

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Heavy nucleus such as uranuim-235, when bombarded with low energy neutrons split into lighter nuclear with the liberation of large amount of energy.

OAVS TGT Science Mock Test - 2 - Question 4
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In our country, vast tracts of forests are cleared and a single species of plant is cultivated. This practice promotes
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Explanation:
The practice of clearing vast tracts of forests and cultivating a single species of plant promotes monoculture in the area. Here's a detailed explanation:
1. Monoculture:
- Monoculture refers to the cultivation of a single type of plant over a large area.
- In this practice, forests are cleared, and only one species of plant is cultivated.
- This results in a lack of biodiversity and a dominance of a single plant species in the area.
2. Lack of Biodiversity:
- Biodiversity refers to the variety of plant and animal species present in an ecosystem.
- Clearing forests and replacing them with a single species of plant reduces the overall biodiversity in the area.
- This is because other plant and animal species that were dependent on the natural forest habitat may not be able to survive in the monoculture environment.
3. Negative Impact on Ecosystem:
- Monoculture disrupts the natural balance of the ecosystem.
- It can lead to the loss of habitat for many native species, as they are unable to adapt to the monoculture environment.
- The absence of different plant species also affects the availability of food and resources for animals, further impacting the ecosystem.
4. Environmental Risks:
- Monoculture can increase the vulnerability of crops to pests, diseases, and climate change.
- With a lack of biodiversity, there is a higher risk of pests and diseases spreading rapidly and causing significant damage to the cultivated plant species.
- Climate change can also have a more severe impact on monocultures, as they lack the resilience provided by diverse plant species.
In conclusion, the practice of clearing forests and cultivating a single species of plant promotes monoculture in the area, which has negative implications for biodiversity, the ecosystem, and environmental resilience.
OAVS TGT Science Mock Test - 2 - Question 5
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Murrah is a high-yielding breed of :-
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The Murrah breed of water buffalo is kept for dairy production. It has been used to improve the milk production of dairy buffalo in other countries, such as Italy, Bulgaria and Egypt. The Murrah buffalo is jet black in colour, sometimes with white markings on the face or legs. They typically have short and tightly curved horns. Average milk production is 2200 litres in a lactation period of 310 days.

OAVS TGT Science Mock Test - 2 - Question 6
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The term 'gene' was introduced by :-
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 6
Introduction:
The term 'gene' is a fundamental concept in genetics, and it refers to a specific sequence of DNA or RNA that is responsible for the inheritance of a particular trait. In this question, we are asked to identify the person who introduced the term 'gene.'
Answer:
The correct answer is D. Johannsen.
Explanation:
Wilhelm Johannsen, a Danish botanist, introduced the term 'gene' in the early 20th century. He used this term to describe the units of hereditary information that determine the characteristics of an organism. Johannsen's work focused on studying the inheritance of traits in plants, particularly in relation to their observable variations.
Additional Information:
While Johannsen coined the term 'gene,' it is important to note that the concept of inheritance and the study of genetics had been developing for many years before him. Key contributors to the field of genetics include:
- Gregor Mendel (A): Mendel, an Austrian monk, is often referred to as the father of genetics. In the mid-19th century, he conducted groundbreaking experiments on pea plants and formulated the laws of inheritance that laid the foundation for modern genetics.
- William Bateson (B): Bateson, an English biologist, was a prominent early advocate of Mendel's work. He played a crucial role in popularizing Mendel's laws of inheritance and promoting the study of genetics in the early 20th century.
- Thomas Hunt Morgan (C): Morgan, an American geneticist, made significant contributions to the field of genetics, particularly in understanding the role of chromosomes in inheritance. His work with fruit flies led to the discovery of sex-linked traits and the concept of gene linkage.
In conclusion, while Johannsen is credited with introducing the term 'gene,' it is important to recognize the contributions of other scientists in the development of genetics as a field of study.
OAVS TGT Science Mock Test - 2 - Question 7
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Which chemical is known as king of chemicals –
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Sulfuric acid is commonly supplied at concentrations of 78, 93 or 98 percent. Sulphuric acid is sometimes referred to as the " King of chemicals " because it is produced. 

OAVS TGT Science Mock Test - 2 - Question 8
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The first use of quantum theory to explain the structure of atom was made by –
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Bohr first made use of quantum theory to explain the structure of atom and proposed that energy of electron in an atom is quantized
OAVS TGT Science Mock Test - 2 - Question 9
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Practice of culturing marine fish is known as:
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Mariculture is a specialized branch of aquaculture involving the cultivation of marine organisms for food and other products in the open ocean, an enclosed section of the ocean, or in tanks, ponds or raceways which are filled with seawater.

OAVS TGT Science Mock Test - 2 - Question 10
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Leishmania reproduce asexually by
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 10

Leishmania reproduces by binary fission.

OAVS TGT Science Mock Test - 2 - Question 11
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If dried apricots are initially placed in plain water for some time and then into a concentrated solution of sugar, they will:
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 11

- Dry apricots when placed in pure water swell due end osmosis (inward movement of water) and later when are transferred sugar solution exosmosis (outward movement of water) occurs and they shrink again.
- When a Red Blood Cell is placed in concentrated saline solution exosmosis occurs and the RBCs shrink due to excess loss of water.

OAVS TGT Science Mock Test - 2 - Question 12
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Amrita Devi Bishnoi sacrificed her life for the protection of
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Amrita Devi Bishnoi sacrificed her life for the protection of Khejri trees.
Amrita Devi Bishnoi was a brave environmentalist who gave her life to protect the Khejri trees in the 18th century. The incident took place in the Bishnoi community, which holds deep reverence for nature and wildlife.
Background:
- Amrita Devi Bishnoi belonged to the Bishnoi community, which is known for its strong belief in environmental conservation.
- The Bishnois follow the teachings of their founder, Guru Jambheshwar, who preached the importance of nature preservation.
The Sacrifice:
- In 1730, the then ruler of the region ordered the cutting of Khejri trees to build a new palace.
- Amrita Devi Bishnoi, along with her three daughters, refused to let the trees be cut down.
- She hugged one of the Khejri trees and proclaimed that she would sacrifice her life to protect them.
- The other villagers, inspired by her courage, also joined in and stood against the tree cutters.
The Aftermath:
- The tree cutters brutally killed Amrita Devi Bishnoi and her daughters.
- However, their sacrifice caught the attention of the authorities and the incident led to public outrage.
- The ruler was forced to revoke the order to cut down the Khejri trees, and the Bishnoi community's dedication to environmental conservation became widely recognized.
Legacy:
- The sacrifice of Amrita Devi Bishnoi and her daughters is celebrated as an act of bravery and devotion to nature.
- The incident played a significant role in raising awareness about the importance of tree conservation and inspired others to protect the environment.
- The Bishnoi community continues to promote environmental sustainability and is actively involved in tree plantation drives and wildlife conservation efforts.
Therefore, it is clear that Amrita Devi Bishnoi sacrificed her life for the protection of Khejri trees, making her a symbol of environmental activism and courage.
OAVS TGT Science Mock Test - 2 - Question 13
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The maleness of a child is determined by
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Explanation:
The maleness of a child is determined by the Y chromosome in the zygote.
- The zygote is formed when the sperm (containing either an X or Y chromosome) fertilizes the egg (which contains an X chromosome).
- If the sperm carries an X chromosome, the zygote will develop into a female child (XX).
- If the sperm carries a Y chromosome, the zygote will develop into a male child (XY).
Key Points:
- The maleness of a child is determined by the presence of the Y chromosome in the zygote.
- The X chromosome alone does not determine maleness.
- The presence of the Y chromosome is necessary for the development of male characteristics.
- The sex determination is not random or by chance, but rather based on the specific combination of chromosomes present in the zygote.
OAVS TGT Science Mock Test - 2 - Question 14
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Brass is a homogeneous mixture of
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Brass is a homogenous mixture of 70% of Copper and 30% Zinc by mass. Copper and Zinc forms homogenous mixture as constituent particles are not visible

OAVS TGT Science Mock Test - 2 - Question 15
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In Mendeleev's periodic table,the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.69 amu.Reason for the same is that:
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 15
According to Mendeleev's classification,the properties of elements are the periodic function of their atomic masses and there is a periodic recurrence of elements with similar physical and chemical properties.

OAVS TGT Science Mock Test - 2 - Question 16
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Name the most abundant element in the earth’s crust?
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 16

The most abundant element in earth’s crust is Oxygen. It is present in earth crust in form of oxide, carbonate etc. of metal.

OAVS TGT Science Mock Test - 2 - Question 17
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Which of the following are exotic breeds?
(i) Brawn
(ii) Jersey
(iii) Brown Swiss
(iv) Jersey Swiss
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 17
Exotic Breeds

The exotic breeds among the given options are:



  • Brawn

  • Jersey Swiss


Therefore, the correct answer is (ii) and (iv).


Explanation:


To determine which breeds are exotic, we need to understand the characteristics of each breed:



  • Brawn: Brawn is not a recognized breed. It may be a misspelling or a lesser-known local breed, but it is not commonly considered an exotic breed.

  • Jersey: Jersey is a recognized breed of dairy cattle, originating from the Channel Island of Jersey. It is a popular breed known for its high milk production.

  • Brown Swiss: Brown Swiss is another recognized breed of dairy cattle. It originates from Switzerland and is known for its large size and high milk production.

  • Jersey Swiss: Jersey Swiss is not a recognized breed. It is likely a combination of the Jersey and Swiss breeds, but it is not a distinct breed itself.


Based on the above information, we can conclude that the exotic breeds among the given options are Jersey and Jersey Swiss. Therefore, the correct answer is (ii) and (iv).

OAVS TGT Science Mock Test - 2 - Question 18
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Neuron receives and transmits information and messages in the form of:
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Neurons receive and transmit information in the form of nerve impulses. These impulses travel along the length of the neuron and allow communication between different parts of the nervous system.

OAVS TGT Science Mock Test - 2 - Question 19
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Which microscope made it possible to observe the complex structure of cell and its organelles?
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 19

Electron  microscope is used to understand the complex structure of the cell and its various organelles. when was it discovered.

OAVS TGT Science Mock Test - 2 - Question 20
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A combination of common salt and iron filings is a
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 20

A combination of common salt and Iron filings is a mixture as there is no chemical reaction between them to form new substance.

OAVS TGT Science Mock Test - 2 - Question 21
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Genotype means :-
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The genotype of an organism is the chemical composition of its DNA, which gives rise to the phenotype, or observable traits of an organism. A genotype consists of all the nucleic acids present in a DNA molecule that code for a particular trait

OAVS TGT Science Mock Test - 2 - Question 22
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 When a sperm is deposited into the vagina which route does it travel?
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 22
Route of Sperm Travel:
The correct route that a sperm takes after being deposited into the vagina is as follows:
Vagina → Cervix → Uterus → Oviduct
Here is a detailed explanation of each step:
1. Vagina: The sperm is initially deposited into the vagina during sexual intercourse.
2. Cervix: The sperm then travels through the cervix, which is the narrow passage that connects the vagina to the uterus. The cervix contains a small opening called the cervical os, which allows the sperm to enter the uterus.
3. Uterus: From the cervix, the sperm enters the uterus, which is a hollow, muscular organ located in the pelvis. The uterus is where a fertilized egg implants and develops into a fetus during pregnancy. The sperm moves through the uterus towards the oviduct.
4. Oviduct: Also known as the fallopian tube or uterine tube, the oviduct is a pair of long, slender tubes that extend from the uterus on each side. The sperm travels through the oviduct, where it may encounter and fertilize an egg if one is present. The oviduct is the site of fertilization and the beginning of the journey for the fertilized egg towards the uterus.
It is important to note that not all sperm reach the oviduct, as the journey is challenging and only a small number of sperm survive and reach the egg. Additionally, the timing of intercourse in relation to ovulation plays a crucial role in the chances of fertilization.
OAVS TGT Science Mock Test - 2 - Question 23
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How do unicellular organisms primarily remove metabolic wastes?
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 23

Unicellular organisms remove metabolic wastes by allowing them to diffuse from their body surface into the surrounding water.

OAVS TGT Science Mock Test - 2 - Question 24
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A zygote which has an X-chromosome inherited from the father will develop into a
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Explanation: 

Humans follow XX- XY mechanism of sex determination.

OAVS TGT Science Mock Test - 2 - Question 25
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Why do air-breathing land animals lose water through evaporation from their respiratory surfaces?
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 25
Air-breathing land animals lose water through evaporation from their respiratory surfaces due to the evaporative power of air. The respiratory surfaces of these animals are moist to facilitate gas exchange, but this moisture can lead to water loss through evaporation. This phenomenon is a necessary trade-off for efficient respiration in terrestrial environments.
OAVS TGT Science Mock Test - 2 - Question 26
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Which of the following contributed to the success of Mendel :-
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 26
Contributions to the success of Mendel:
1. His knowledge of biology:
- Mendel's background in biology allowed him to understand the basic principles of inheritance and genetics.
- He was knowledgeable about the reproductive processes of plants, which allowed him to perform experiments and make accurate observations.
2. Qualitative analysis of data:
- Mendel meticulously collected and analyzed data from his experiments.
- He focused on qualitative traits, such as flower color or seed texture, rather than just counting the number of offspring.
- This approach allowed him to identify distinct patterns of inheritance and formulate his laws of genetics.
3. Observation of distinct inherited traits:
- Mendel chose to study traits that were easily distinguishable and occurred in distinct forms, such as tall vs. short plants or yellow vs. green peas.
- By selecting traits with clear-cut variations, he was able to easily track their inheritance patterns and make accurate predictions.
4. Consideration of one character at a time:
- Instead of studying multiple traits simultaneously, Mendel focused on one trait, such as flower color, in each experiment.
- This allowed him to establish clear and consistent patterns of inheritance for each trait and avoid confusion or overlap between different traits.
In conclusion, Mendel's success can be attributed to his knowledge of biology, his qualitative analysis of data, his observation of distinct inherited traits, and his consideration of one character at a time. These factors enabled him to make significant discoveries in the field of genetics and lay the foundation for modern understanding of inheritance.
OAVS TGT Science Mock Test - 2 - Question 27
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Ultrasound is not used to:
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 27

When bats detect ultrasonic waves which after touching the prey comes back to bats ear which tell them how far their prey is and how it looks like. Similarly people detect ultrasonic waves to know the distance. the waves touch the building and comes back which tells us how far it is.

OAVS TGT Science Mock Test - 2 - Question 28
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Which of the following canals brought about greenery in Rajasthan ?
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 28
Canals that brought about greenery in Rajasthan:

  • Rajiv Gandhi Canal:


    • This canal did not bring about greenery in Rajasthan.


  • Indira Gandhi Canal:


    • This canal played a significant role in bringing greenery to Rajasthan.

    • It is the longest canal in India and has been instrumental in transforming the arid regions of Rajasthan into fertile agricultural lands.

    • The canal provides water for irrigation to numerous districts and has helped in increasing agricultural productivity.


  • Jawaharlal Canal:


    • There is no canal named Jawaharlal Canal in Rajasthan.


  • Mahatma Gandhi Canal:


    • This canal does not exist in Rajasthan.



Therefore, the correct answer is Indira Gandhi Canal (Option B) as it has been responsible for bringing about greenery in Rajasthan.

OAVS TGT Science Mock Test - 2 - Question 29
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Acids change the colour of methyl orange to:
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 29

Methyl orange is a pH indicator frequently used in titration because of its clear and distinct colour variance at different pH values. Methyl orange shows pink colour in acidic medium and yellow colour in basic medium. Because it changes colour at the pH of a mid strength acid, it is usually used in titration for acids. Unlike a universal indicator, methyl orange does not have a full spectrum of colour change, but it has a sharp end point.

OAVS TGT Science Mock Test - 2 - Question 30
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Which of the following is an inexhaustible natural resources ?
Detailed Solution for OAVS TGT Science Mock Test - 2 - Question 30

D is the correct option.Inexhaustible natural resource is a natural resource that will never run out. It will not be depleted and will continue to exist forever , such as water,sunlight, tidal energy, ocean energy and wind energy.

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