Science Trivia For Class 11 And 12
1.
Why does a person sitting in a moving bus suddenly move forward when the bus suddenly stops?
Answer:
Due to inertia
Explanation:
Jacobson's organs, also known as the vomeronasal organs, are two pits located on the palate of a snake. These specialized sensory organs are used to detect pheromones and other chemical signals in the environment. When a snake flicks its tongue, it picks up scent particles and transfers them to Jacobson's organs for analysis. This allows the snake to track prey, find mates, and navigate its surroundings more effectively. The ability to detect chemical cues is crucial for a snake's survival, making Jacobson's organs an essential part of its sensory system.
2.
A person sitting in a moving car has _________energy.
Answer:
Both kinetic and potential energy
Explanation:
A person sitting in a moving car has both kinetic and potential energy. Kinetic energy is the energy of motion, so as the car moves, the person also moves, giving them kinetic energy. Potential energy is the energy stored due to an object's position or state. If the car is at a certain height, such as on a hill, the person has gravitational potential energy due to their position relative to the ground. Therefore, while moving, the person possesses both kinetic energy from the car's motion and potential energy from their position within the gravitational field.
3.
Why does mud fly off a stick when you swing it into another object?
Answer:
Due to inertia
Explanation:
Mud flies off a stick when you swing it into another object due to inertia. Inertia is the property of matter that keeps an object at rest or in uniform motion unless acted upon by an external force. When you swing the stick, both the stick and the mud are moving together. However, when the stick suddenly changes direction or stops upon hitting another object, the mud tends to continue moving in its original direction due to inertia. This causes the mud to fly off the stick. This principle is an example of Newton's First Law of Motion.
4.
Why are transition elements given that name? Choose the most appropriate option.
Answer:
Both A and B
Explanation:
Transition elements are given that name because they exhibit variable valency and often have different colors. Variable valency means that these elements can form ions with different charges, due to the involvement of d-orbitals in bonding. This characteristic leads to a variety of oxidation states. Additionally, many transition elements and their compounds display a range of colors, which is due to the d-d electron transitions when they absorb visible light. These properties are distinct and significant, making the name "transition elements" particularly appropriate for this group in the periodic table.
5.
Why is it challenging to prepare a supersaturated solution?
Answer:
Because it cant be prepared at room temperature
Explanation:
It is challenging to prepare a supersaturated solution because it can't be prepared at room temperature. A supersaturated solution contains more dissolved solute than is normally possible at a given temperature. To achieve this, the solution must first be heated to a higher temperature to dissolve an excess amount of solute, and then carefully cooled down without disturbing it. At room temperature, the solubility of the solute is lower, making it difficult to maintain a supersaturated state. This delicate process makes supersaturation challenging to achieve and maintain.
6.
6. Is electrolysis the same as ionization? If not, why?
Answer:
Electrolysis can't be done without ionization.
Explanation:
Electrolysis and ionization are related but not the same. Electrolysis is a process that uses an electric current to drive a non-spontaneous chemical reaction, causing compounds to split into their ions. Ionization is the process of forming ions, which can occur through various means, including electrolysis. During electrolysis, ionization is essential because it involves the formation of ions that move towards the electrodes to complete the reaction. Therefore, electrolysis relies on ionization to occur, but they are distinct processes.
7.
Why on hitting the ball with the center of the bat more effective short is played?
Answer:
Both A and B
Explanation:
Hitting the ball with the center of the bat, also known as the "sweet spot," is more effective because the center of gravity remains within its base. When the ball is struck at this point, the force is distributed evenly, resulting in minimal vibration and maximum energy transfer. This produces a more powerful and controlled shot. The balance and stability provided by the center of gravity remaining within its base help in generating a more effective and accurate hit. This principle is crucial for achieving the best performance in sports like baseball and cricket.
8.
What are Jacobson's organs?
Answer:
Two pits present on the palate of the snake
Explanation:
Jacobson's organs, also known as the vomeronasal organs, are two pits located on the palate of a snake. These specialized sensory organs are used to detect pheromones and other chemical signals in the environment. When a snake flicks its tongue, it picks up scent particles and transfers them to Jacobson's organs for analysis. This allows the snake to track prey, find mates, and navigate its surroundings more effectively. The ability to detect chemical cues is crucial for a snake's survival, making Jacobson's organs an essential part of its sensory system.
9.
Each rank of classification is called:
Answer:
None of these
Explanation:
Each rank of classification in biological taxonomy is called a "taxon" (plural: taxa). This term refers to a group of one or more populations of an organism or organisms that are seen by taxonomists to form a unit. The ranks include domain, kingdom, phylum, class, order, family, genus, and species. These ranks help organize and categorize organisms based on shared characteristics and evolutionary relationships. Since the correct term "taxon" is not listed among the provided options, the answer is "none of these." Understanding these ranks is fundamental in the study of biological classification and systematics.
10.
Enthalpy of products of exothermic reaction is_________.
Answer:
Lower
Explanation:
In an exothermic reaction, the enthalpy of the products is lower than that of the reactants. This is because exothermic reactions release energy, usually in the form of heat, to the surroundings. The loss of energy results in a decrease in the enthalpy (heat content) of the products compared to the reactants. This energy release is what makes exothermic reactions feel hot, as the system releases heat into its environment. Understanding this concept is crucial in thermodynamics and helps explain why certain reactions occur spontaneously and how energy is conserved in chemical processes.
11.
A cream separator works on the principle of:
Answer:
Centrifugal Force
Explanation:
A cream separator works on the principle of centrifugal force. When the separator spins, the centrifugal force pushes the denser milk outward while the lighter cream collects in the center. This separation occurs because centrifugal force acts on the different densities of the milk and cream, causing them to move to different areas within the spinning container. This process efficiently separates the cream from the milk, allowing for the collection of cream for further processing or consumption. Understanding the role of centrifugal force is key in many applications, including industrial and scientific processes.
12.
What kind of quantity is work?
Answer:
Scalar Quantity
Explanation:
Work is a scalar quantity, which means it only has magnitude and no direction. In physics, work is defined as the product of the force applied to an object and the distance over which that force is applied, in the direction of the force. Since it does not involve direction, it is considered a scalar quantity. Unlike vector quantities, which have both magnitude and direction, scalar quantities like work are described by a single numerical value. This distinction is important in understanding the fundamental concepts of physics and how different physical quantities are measured and analyzed.
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