UP Board Class 10 Science Question Paper 2024 (Code 824 IN) Available : Download Solution PDf With Answer Key

N/A Quick Tip: For a convex lens forming a real image of the same size as the object, the distance between the object and the image is twice the focal length.

N/A Quick Tip: A convex mirror always produces a virtual, erect, and diminished image, making its magnification less than 1.

N/A Quick Tip: The power of a lens is calculated using \( P = \frac{100}{f} \), where \( f \) is in cm. A convex lens has a positive power.

N/A Quick Tip: The deviation of light in a prism depends on its wavelength. Red light, having the longest wavelength, experiences the least deviation.

N/A Quick Tip: Resistance of a wire is directly proportional to length and inversely proportional to the cross-sectional area.

N/A Quick Tip: Electrical power formulas include \( P = VI \), \( P = I^2 R \), and \( P = \frac{V^2}{R} \).

N/A Quick Tip: Magnetic field due to a long straight current-carrying wire follows \( B \propto \frac{1}{r} \).

N/A Quick Tip: \( H^+ \) ions are responsible for the acidic nature of a solution.

N/A Quick Tip: Washing soda (\( Na_2CO_3 \cdot 10H_2O \)) contains 10 water molecules of crystallization.

N/A Quick Tip: Noble gases like Helium (\( He \)) are non-metals and are chemically inert.

N/A Quick Tip: Metals generally form ionic compounds by losing electrons to form cations.

N/A Quick Tip: Plaster of Paris hardens into Gypsum when mixed with water.

N/A Quick Tip: The reaction of ethanol with sodium metal releases hydrogen gas.

N/A Quick Tip: Humans have 2 sex chromosomes (XX in females, XY in males) and 44 autosomes.

N/A Quick Tip: Respiration involves oxygen intake and the breakdown of food to produce energy.

N/A Quick Tip: The forebrain controls higher cognitive functions, including thinking and decision-making.

N/A Quick Tip: Unisexual flowers contain only male or female reproductive parts. Papaya is a unisexual plant.

N/A Quick Tip: The 10% rule states that only 10% of energy is passed on to the next trophic level.

N/A Quick Tip: Photosynthesis produces glucose (\( C_6H_{12}O_6 \)) and oxygen as its primary products.

N/A Quick Tip: Estrogen is an animal hormone, not a plant hormone.

N/A Quick Tip: Convex mirrors provide a wider view, making them ideal for rear-view mirrors in vehicles.

N/A Quick Tip: For a concave mirror, a virtual image is formed when the object is placed between the pole and the focus.

N/A Quick Tip: Myopia is corrected using a concave lens, which helps in diverging light rays before they enter the eye.

N/A Quick Tip: Rayleigh scattering causes blue light to scatter more than other wavelengths, making the sky appear blue.

N/A Quick Tip: Fleming’s Left-Hand Rule helps determine the direction of force on a current-carrying conductor in a magnetic field.

N/A Quick Tip: Heat energy (\( H \)) in a resistor is calculated using \( H = I^2 R t \).

N/A Quick Tip: For resistors in parallel, use \( \frac{1}{R_{eq}} = \frac{1}{R_1} + \frac{1}{R_2} \), and for resistors in series, add them directly.

N/A Quick Tip: Ohm’s Law states that current \( I = \frac{V}{R} \). Knowing total resistance and voltage allows calculating total current.

N/A Quick Tip: Potential difference (\( V \)) is calculated using \( V = IR \), where \( I \) is the current and \( R \) is the resistance between two points.

N/A Quick Tip: The magnetic field around a current-carrying circular loop forms concentric circles, and its direction follows the right-hand thumb rule.

N/A Quick Tip: Electromagnets work only when current flows and are widely used in medical and industrial applications.

N/A Quick Tip: Unlike permanent magnets, electromagnets can be switched on or off and have adjustable strength.

N/A Quick Tip: The electrochemical series ranks elements based on their electrode potential, aiding in reactivity and displacement reactions.

N/A Quick Tip: Ionic bonds form when one atom donates electrons and another accepts them to complete their octets.

N/A Quick Tip: Neutralisation reactions help in maintaining pH balance and are used in antacids and wastewater treatment.

N/A Quick Tip: Reduction is the gain of electrons or a decrease in oxidation state. It occurs simultaneously with oxidation in redox reactions.

N/A Quick Tip: Sodium oxide (\( Na_2O \)) dissolves in water to form sodium hydroxide, a strong base.

N/A Quick Tip: This reaction produces bleaching powder (\( CaOCl_2 \)), used for disinfection.

N/A Quick Tip: Ethanol undergoes dehydration in the presence of concentrated \( H_2SO_4 \) to form ethene.

N/A Quick Tip: Ethanoic acid reacts with sodium bicarbonate to release carbon dioxide gas, which is observed as effervescence.

N/A Quick Tip: This esterification reaction forms ethyl ethanoate, which has a fruity smell.

N/A Quick Tip: Ethane undergoes complete combustion in oxygen, producing carbon dioxide and water vapor.

N/A Quick Tip: pH is a logarithmic scale where a decrease in one unit means a tenfold increase in acidity.

N/A Quick Tip: Unsaturated hydrocarbons undergo addition reactions, making them useful in polymer production and industrial applications.

N/A Quick Tip: In IUPAC nomenclature, the longest carbon chain containing the functional groups is chosen, and priority is given to the triple bond over the hydroxyl group.

N/A Quick Tip: In IUPAC nomenclature, alcohols are named with the suffix -ol, and the position of the hydroxyl (-OH) group is indicated by the lowest possible number.

N/A Quick Tip: Fission is common in unicellular organisms like Amoeba and Paramecium.

N/A Quick Tip: Fragmentation occurs in multicellular organisms like Spirogyra and some fungi.

N/A Quick Tip: Regeneration is common in lower animals like Planaria and Starfish.

N/A Quick Tip: Budding is common in organisms like Hydra and Yeast.

N/A Quick Tip: An ecosystem consists of biotic and abiotic factors interacting for survival and sustainability.

N/A Quick Tip: The ozone layer protects life on Earth from UV rays, but pollutants like CFCs are depleting it.

N/A Quick Tip: The kidneys filter around 50 gallons of blood daily, maintaining homeostasis and detoxifying the body.

N/A Quick Tip: Geotropism helps roots anchor plants in soil and absorb nutrients while guiding shoots towards light.

N/A Quick Tip: Growth hormones are essential for height, muscle development, and metabolism in humans.

N/A Quick Tip: Heterotrophic organisms depend on plants or other animals for energy and survival.