Search Previous Year Questions

Given Word:

KLATSCH

Step 1: Change each letter to the immediately following letter in the English alphabet.

Step 2: Arrange the new letters in alphabetical order.

Required:

Fourth from the right = L.

Hence, the correct answer is "Option 3".

The logic followed for the given series is based on the English alphabetical order where each letter in the triplet increases by 6 to form the subsequent term.

Therefore, the next term in the series is NGM.

Hence, the correct answer is "Option 2".

Given:

Let us first decode the given symbols and then draw a family tree.

On checking the expression: M + K ÷ L − P × R

1. M + K - 'M + K' means M is the sister of K.

2. K ÷ L - 'K ÷ L' means K is the father of L.

3. L − P - 'L − P' means L is the brother of P.

4. P × R - 'P × R' means P is the wife of R.

From the family tree, P is the wife of R, K is the father of P, and M is the sister of K. Thus, M is the sister of R's father-in-law.

Therefore, M is R's Wife's father's sister.

Hence, the correct answer is 'Option 2'.

Given:

Let us first decode the given symbols and then draw a family tree.

On checking: A + B # H @ K div T

1. A + B - 'A + B' means 'A is the daughter of B'.

2. B # H - 'B # H' means 'B is the mother of H'.

3. H @ K - 'H @ K' means 'H is the father of K'.

4. K div T - 'K div T' means 'K is the wife of T'.

Therefore, A is the sister of H, who is the father of K, who is the wife of T → A is the Wife's father's sister of T.

Hence, the correct answer is 'Option 4'.

Given Series:

(Left) R Y V O B I E A U K E H G B V T G R C S T (Right)

Required pattern:

Consonant → Vowel → Vowel

Checking the series:

(Left) R Y V O B I I B I E E A U K E H G B V T G R C S T (Right)

Vowels satisfying the condition:

→ I in (B I E)

Therefore, there is 1 such vowel.

Hence, the correct answer is "Option 3".

The correct answer is Electrons.

Key Points

• Sir J.J. Thomson proposed his atomic model in 1904, shortly after his groundbreaking discovery of the electron in 1897 through cathode ray tube experiments.
• In this model, the atom is envisioned as a positively charged sphere in which negatively charged electrons are embedded, similar to plums or raisins in a traditional British Christmas pudding.
• The 'plum' in the analogy specifically represents the electrons, which are the discrete, negatively charged subatomic particles scattered throughout the positive medium.
• The 'pudding' itself represents the diffuse cloud of positive charge that occupies the entire volume of the atom.
• Thomson postulated that the magnitude of the positive charge of the sphere is exactly equal to the total negative charge of the electrons, ensuring that the atom remains electrically neutral.
• This model was a significant step in atomic physics as it was the first to incorporate the existence of subatomic particles within a defined structure.

 Additional Information

• Alpha particles:
• These are positively charged particles consisting of two protons and two neutrons, identical to a helium nucleus.
• They were used by Ernest Rutherford in his famous Gold Foil Experiment in 1911 to disprove Thomson's model.
• Protons:
• While Thomson acknowledged a positive charge, the concept of the proton as a distinct subatomic particle was developed by Rutherford in 1917.
• In modern models, protons are concentrated in the nucleus rather than being spread out as a sphere.
• Neutrons:
• These are electrically neutral subatomic particles located in the nucleus, discovered by James Chadwick in 1932.
• They were not part of the plum pudding model, as their existence was unknown at that time.
• Watermelon Model:
• Thomson's model is also compared to a watermelon, where the red edible part is the positive charge and the seeds represent the electrons.

The correct answer is Cells are tightly packed with minimal intercellular space.

Key Points

• Epithelial tissue is one of the four primary types of animal tissues, serving as a protective covering for the body surface and a lining for internal organs, body cavities, and ducts.
• The primary structural feature that enables its protective function is the tightly packed arrangement of cells, which forms a continuous, unbroken sheet across the surfaces it covers.
• Because the cells are placed so closely together, there is minimal intercellular space and a very small amount of extracellular matrix, which acts as a physical barrier against mechanical injury, chemical exposure, and the entry of pathogens like bacteria or viruses.
• These cells are held together by specialized intercellular junctions, such as tight junctions and adherens junctions, which seal the gaps between adjacent cells to prevent the leakage of fluids and solutes.
• All epithelial tissues rest on a non-cellular, thin fibrous layer known as the basement membrane, which provides structural support and anchors the tissue to the underlying connective tissue.
• The tissue is avascular, meaning it lacks its own blood supply; instead, it relies on diffusion from the blood vessels in the underlying connective tissue for nutrients and waste removal.

 Additional Information

• Analysis of Incorrect Options:
• Connective Tissue Characteristics: Cells that are loosely arranged with an abundant extracellular matrix are characteristic of connective tissues, such as areolar tissue or cartilage, which focus on binding and support rather than forming a tight surface seal.
• Intercellular Junctions: While desmosomes (anchoring junctions) are crucial for resisting mechanical stress in epithelia, cells are not connected exclusively by them; they also require tight junctions for barrier integrity and gap junctions for cellular communication.
• Muscle Tissue Structure: Cells that are long, cylindrical, and multinucleated are specifically skeletal muscle fibers, which are adapted for locomotion and voluntary movement rather than acting as a protective surface layer.
• Classification of Epithelia:
• Simple Epithelium: Composed of a single layer of cells, optimized for absorption and filtration in areas like the kidney tubules and lung alveoli.
• Stratified Epithelium: Consists of two or more layers of cells, providing superior protection in high-wear areas like the skin (epidermis) and lining of the mouth.

The correct answer is Striated appearance.

Key Points

• Skeletal muscles are characterized by a distinct striated appearance when viewed under a microscope, which is caused by the highly organized arrangement of internal contractile proteins.
• This striation is due to repeating units called sarcomeres, which contain thick filaments made of myosin and thin filaments made of actin.
• The regular overlapping of these filaments creates alternating dark A-bands (anisotropic) and light I-bands (isotropic), resulting in the visible transverse stripes.
• Unlike other muscle tissues, skeletal muscle is under voluntary control, meaning its contraction is consciously directed by the somatic nervous system to move the skeletal system.
• Each skeletal muscle cell, or muscle fiber, is a multinucleated syncytium, where multiple nuclei are located at the periphery of the cell just beneath the sarcolemma (plasma membrane).

 Additional Information

• Smooth Muscle:
• Exhibits a non-striated appearance because its myofilaments are not arranged into sarcomeres.
• Cells are spindle-shaped and typically contain a single, central nucleus.
• Functions under involuntary control by the autonomic nervous system and is found in the digestive tract and blood vessels.
• Cardiac Muscle:
• Like skeletal muscle, it is striated, but it is involuntary and found only in the heart wall (myocardium).
• Contains specialized cell junctions called intercalated discs that allow for synchronized contractions.
• Cells are generally branched and possess one or two central nuclei.

The correct answer is It pollutes the water and harms aquatic life..

Key Points

• Non-biodegradable waste consists of materials that cannot be decomposed or broken down by biological agents such as bacteria, fungi, or other microorganisms over any reasonable period of time.
• When these wastes, such as plastics, glass, and synthetic chemicals, are dumped into water bodies, they persist in the environment for decades or even centuries, leading to long-term pollution.
• This accumulation degrades water quality by altering its chemical composition and clarity, which negatively impacts the survival of fish, amphibians, and aquatic plants.
• Aquatic animals often mistake plastic debris for food; ingestion leads to physical injuries, choking, and starvation as their digestive systems become blocked.
• Toxic chemicals from materials like lead, mercury, and pesticides leach into the water, causing reproductive failure and increased mortality rates in aquatic species.

 Additional Information

• Impact on the Food Chain:
• Biomagnification: Toxins from non-biodegradable waste increase in concentration as they move up the food chain, eventually reaching apex predators and humans.
• Bioaccumulation: This refers to the gradual accumulation of substances, such as pesticides or methylmercury, in the tissues of a single organism.
• Physical Consequences:
• Turbidity: Solid waste increases the turbidity of water, which blocks sunlight and prevents submerged aquatic vegetation from performing photosynthesis.
• Microplastics: Larger plastic items eventually break down into microplastics (less than 5mm), which are easily ingested by zooplankton and small fish.

The correct answer is Salt and water.

Key Points

• Metal oxides are generally basic in nature because they react with acids to form salt and water, a process analogous to the reaction between a base and an acid.
• When a metal oxide reacts with an acid, it undergoes a neutralization reaction. This chemical interaction results in the displacement of the oxygen in the oxide by the acid's anion.
• The general chemical equation for this reaction is: Metal Oxide + Acid → Salt + Water.
• During the reaction, the hydrogen ions (H⁺) from the acid combine with the oxide ions (O²⁻) from the metal oxide to specifically produce water (H₂O).
• A common example is the reaction of Magnesium Oxide (MgO) with Sulfuric Acid (H₂SO₄), which produces Magnesium Sulfate (MgSO₄), a salt, and water.
• Another practical example observed in laboratories is the reaction of black Copper(II) Oxide (CuO) with Hydrochloric Acid (HCl), forming a blue-green solution of Copper(II) Chloride (CuCl₂) and water.

 Additional Information

• Amphoteric Oxides:
• Some metal oxides, such as Aluminium Oxide (Al₂O₃) and Zinc Oxide (ZnO), show both acidic and basic behavior. They react with both acids and bases to produce salt and water.
• Reaction with Non-Metal Oxides:
• Non-metal oxides (like CO₂ or SO₂) are typically acidic. When they react with bases (alkalis), they also produce salt and water, reinforcing the principle of neutralization.
• Other Reaction Products:
• Hydrogen Gas: This is typically produced when a reactive metal (like Zinc or Iron) reacts with a dilute acid, rather than a metal oxide.
• Carbon Dioxide: This gas is released when metal carbonates or metal hydrogen carbonates react with acids.
• Oxygen Gas: This is usually a product of the thermal decomposition of certain metal oxides (e.g., Lead dioxide) or the reaction of peroxides, but not standard acid-oxide neutralization.