General Knowledge Mock Test - 9 - CDS MCQ

An example of a chemical change is (c) Burning of wood. Chemical changes involve the formation or breaking of chemical bonds, resulting in the creation of new substances with different properties. Burning wood involves a combustion reaction that releases energy and transforms the wood into ash, gases, and smoke.

Iron, located in the d-block of the periodic table, is roughly at the center.

Antacid:

• Antacids are medicines that counteract (neutralize) the acid in your stomach to relieve indigestion and heartburn.
• Antacids may help if you have: 
  • Indigestion
  • Heartburn or acid reflux – also known as gastro-oesophageal reflux disease (GORD)
  • Stomach ulcer
  • Gastritis (inflammation of the stomach lining) 

The shielding effect remains constant across a period in the periodic table. This is because electrons are being added to the same energy level. Even though the number of electrons increases, they are roughly the same distance from the nucleus and do not shield each other effectively from the increasing nuclear charge. Therefore, the shielding effect remains constant.

In 1932, James Chadwick, an English physicist, discovered the neutron. He conducted a series of experiments involving the bombardment of beryllium with alpha particles, which led to the discovery of a neutral particle with a mass similar to that of a proton. This discovery provided crucial evidence for the existence of a neutral subatomic particle, the neutron, and contributed significantly to our understanding of atomic structure and nuclear reactions.

An oxidizing agent is the substance that is reduced in a redox reaction.

Aluminum is commonly used in the aerospace and automotive industries due to its lightweight nature and high strength-to-weight ratio. It helps reduce the overall weight of the structures while maintaining durability.

The value of the Universal Gravitational Constant (G) in CGS (Centimeter-Gram-Second) units is approximately 6.67 * 10^(-8) cm³ g^(-1) s^(-2).

So, the correct option from the provided choices is C) 6.67 * 10^(-8) cgs unit.

Atmospheric pressure decreases with increasing altitude. This is because the weight of the air above decreases as altitude increases.

Sound or Audible waves are sensitive to human ear and are generated by the vibrating bodies like tuning fork, vocal cords etc. Infrasonic waves are produced by sources of bigger size such as earth quakes, volcanic eruptions, ocean waves etc. Human ear cannot detect Ultrasonic waves. But dog, cat, bat etc can detect these waves. Bat not only detect but also produce ultrasonic waves.

Photosynthesis is the term used to describe the process by which green plants use sunlight to synthesize food from carbon dioxide and water. In this process, plants convert light energy into chemical energy in the form of glucose, releasing oxygen as a byproduct. This process is vital for the production of food and the release of oxygen into the atmosphere.

Sunlight is the primary source of energy for most ecosystems. Sunlight provides the energy needed for photosynthesis in plants, which forms the basis of the food chain or food web. Producers, such as plants and algae, convert sunlight into chemical energy, and this energy is then transferred to consumers through their consumption of plants or other animals.

The study of the blood circulatory system is called Angiology The medical term “angiology” refers to the study of illnesses affecting the lymphatic and circulatory systems, namely arteries, veins, and lymphatic vessels.

Albert Einstein developed the theory of relativity. His groundbreaking work on special relativity (1905) and general relativity (1915) revolutionized our understanding of space, time, and gravity. Einstein's theory of relativity introduced the famous equation E=mc², which relates mass and energy.

The instrument used to measure the humidity in the air is (d) hygrometer. A hygrometer is specifically designed to measure the moisture content or relative humidity in the atmosphere. It is commonly used in meteorology, indoor climate control, and various scientific and industrial applications.

Gay-Lussac's law states that the pressure of a gas is directly proportional to its absolute temperature at constant volume.

The general formula CnH2n+2 represents alkanes. Alkanes are saturated hydrocarbons with single covalent bonds between carbon atoms.

CO₂ is a non-polar molecule primarily because the dipole moment is zero.
In a molecule, a dipole moment is formed when there is a difference in electronegativity between the atoms. This causes a charge imbalance and creates a dipole (two poles, one positive and one negative). In CO₂, the molecule is linear with the oxygen atoms on either side of the carbon atom. While oxygen is more electronegative than carbon, causing each C-O bond to be polar, the linear shape of the molecule ensures that the individual bond dipoles cancel each other out.
Because the molecule is symmetrical, the dipoles on either side of the carbon atom are equal in magnitude but opposite in direction. As a result, the net dipole moment of the entire molecule is zero, making it non-polar.
So, while the linear geometry (option A) and Sp hybridization (option C) contribute to the overall characteristics of CO₂, the best explanation for its non-polarity is the zero dipole moment (option B).

 Coral reef is an example of a natural ecosystem. Natural ecosystems are those that occur without significant human intervention and have developed over long periods of time. Coral reefs are diverse marine ecosystems that provide habitats for numerous species and are characterized by the presence of corals, fish, and other marine organisms.

Stable population sizes are a characteristic of a sustainable ecosystem. A sustainable ecosystem is one that can persist over time without degrading its natural resources or compromising the well-being of its inhabitants. It is characterized by balanced population sizes, efficient resource use, and the maintenance of biodiversity. High pollution levels, overexploitation of resources, and loss of biodiversity are not consistent with a sustainable ecosystem.

Haemoglobin consists of iron in its cells, and it turns red when it combines with oxygen. Oxygen binds to the iron component of haemoglobin, forming a complex known as oxyhemoglobin. This complex gives oxygenated blood its bright red color. When oxygen is released from haemoglobin, such as in tissues where oxygen is needed, the color of the blood becomes darker, appearing more bluish-red.

Viruses lack enzymes necessary for the generation of energy. This statement is correct. Viruses are obligate intracellular parasites and do not possess the cellular machinery required for generating energy on their own. They rely on host cells to replicate and produce new viral particles.

Viruses can be cultured in any synthetic medium. This statement is incorrect. Viruses require living host cells to replicate and cannot be cultured in synthetic media alone. They can only replicate within suitable host cells.

Viruses are transmitted from one organism to another by biological vectors only. This statement is incorrect. While some viruses are transmitted through biological vectors (e.g., mosquitoes transmitting the dengue virus), not all virus transmissions rely on vectors. Viruses can also spread through direct contact, respiratory droplets, contaminated surfaces, and other means.

So, the correct answer is a) 1 only.

The Right to Freedom of Religion (Article 25-28) allows individuals to manage and administer their religious affairs, including the right to establish and maintain religious institutions.

The 74th Amendment Act was enacted in 1992 to empower and decentralize the Municipalities in India.