OAVS TGT Science Mock Test - 4 - OTET MCQ

Graphite has a hexagonal sheet structure in which every carbon atom is bonded to 3 other carbon atoms and the adjacent layers are arranged together by weak van der waal forces of attraction. 
The gap between the adjacent layers makes it soft and slippery.

The excretory system in humans includes kidneys, ureters, bladder, and urethra.

Sodium aluminate and hydrogen gas are formed when sodium hydroxide reacts with aluminium metal.
2NaOH + 2Al + 2H₂O ⇨ 2NaAlO₂ + 2H₂

Metals have 1-3 electrons in their outermost orbit. They are present on the extreme left of the periodic table. They tend to donate electrons and obtain the stable electronic configuration of the nearest noble gas. The valency on metals also ranges from 1-3 .

Phenolphthalein is often used as an indicator in acid–base titrations. For this application, it turns colourless in acidic solutions and magenta in basic solutions.

The majority of carbon dioxide is transported as part of the bicarbonate system. Carbon dioxide diffuses into red blood cells. Inside, carbonic Anhydrase converts carbon dioxide into carbonic acid, which is subsequently hydrolyzed into bicarbonate. 

Mentions sugar (sucrose), salt (sodium chloride), and diamond as examples of materials with crystalline structures. Diamond has a well-defined internal arrangement of atoms, making it a crystal. Graphite, on the other hand, is not mentioned in the examples provided.

Inactivity series silver is placed below the copper. hence copper is more reactive than silver. The more reactive element can displace the less reactive element from its solution.

Germanium was discovered later.

Limbs are the voluntary muscles because we can completely control them.

Osmotic pressure in artificial kidneys creates a pressure gradient for diffusion of waste products.

Suspension: When the particle size is greater than 1000 nm, then the solution is considered as a suspension.

22 carat gold is a homogeneous mixture in which gold is mixed with small amount of copper or silver.

After mitosis two identical cells are created with the same original number of chromosomes as the parent cell.
If the cell has 5 pairs of chromosomes, i.e., 10 chromosomes, then the two daughter cells produced will also have 10 chromosomes. This is because mitosis is an equational division. Hence, the chromosome number remains constant.

ZnO(s) + CO(s) → Zn(s) + CO₂(g)

• Since oxygen has combined with carbon, carbon is the one that is oxidized and ZnO is the oxidizing agent. Similarly carbon has taken the oxygen of ZnO, carbon is the reducing agent and ZnO is the one that has been reduced.
• Reducing agent-C
• Oxidizing agent-ZnO
• Oxidized-CO
• Reduced- ZnO

So Option C is correct

 Used as a cleansing agent in industries and households. It finds its application in paper, textile, soap, and detergent industries.

Vacuole and lysosome are covered by a single membrane.

Trend of atomic size is :- 
In period it decreases due to large Electronegativity . In group it increases due to low  Electronegativity. According to this order, option ( b) is correct. 

Nephrons are the basic filtration units in the kidneys.

The least compressible state of matter is solid form. 

Solids have much more connected bonds or forces between their own atoms. Since their atoms are more tightly packed together, closer to one another, and are stronger bonds than liquids and gases, then they require more energy (more compression) to change the structure of their atoms. 

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

Proteins serve as respiratory substrates when carbohydrates and fats are not readily available for energy production. In such circumstances, proteins are utilized as an alternative source of energy through the process of respiration. This highlights the flexibility of the human body in utilizing different macronutrients based on availability and metabolic needs.

Plants communicate information between cells via hormonal secretions.

Lead battery contains lead and sulphuric acid as its components. The acid contaminates river water lowering the pH from 7 to 3.5 - 4.5.