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

Convex lenses with small focal lengths provide high magnification, making them ideal for reading and magnifying objects.

Atmospheric refraction causes the apparent position of stars to shift, leading to the twinkling effect observed from Earth.

Convex mirrors always form virtual, diminished, and erect images, making them ideal for rear-view mirrors.

Shorter wavelengths (e.g., blue, violet) deviate more than longer wavelengths (e.g., red, orange) in a prism.

Quick Tip: Ohm measures resistance, Watt measures power, Ampere measures current, and Volt measures potential difference.

In a series circuit, total resistance is the sum of individual resistances. In parallel circuits, the reciprocal of total resistance is the sum of reciprocals of individual resistances.

Quick Tip: For a negatively charged particle moving in a magnetic field, apply Fleming’s Left-Hand Rule and reverse the direction obtained.

N/A Quick Tip: Aldehydes always contain the -CHO functional group and are named with the suffix "-al."

N/A Quick Tip: A solution with pH 7 is neutral, below 7 is acidic, and above 7 is basic.

Ketones have a C=O group within the carbon chain and are named with the suffix "-one."

Highly reactive metals like potassium, sodium, and calcium react with cold water to produce hydrogen gas.

Calcination is used for carbonate ores, whereas roasting is used for sulfide ores.

In a displacement reaction, a more reactive metal displaces a less reactive metal from its compound.

Photosynthesis requires CO\(_2\), water, sunlight, and chlorophyll to produce glucose and oxygen.

Cytokinins stimulate cell division, shoot growth, and delay aging in plants.

Anthers produce pollen grains, which contain male gametes for fertilization in plants.

Planaria can regenerate an entire body from just a small fragment due to neoblast cells.

A synapse allows neurons to communicate using electrical and chemical signals.

Producers like green plants, algae, and phytoplankton form the base of the food chain.

Mendel's pea plant experiments led to the discovery of dominant and recessive traits, forming the foundation of modern genetics.

N/A Quick Tip: Scattering of light explains various natural occurrences such as the reddish appearance of the sun during sunrise and sunset.

Myopia is corrected using a concave lens, while hypermetropia is corrected using a convex lens.

Convex mirrors are used for wider visibility, while convex lenses are used to focus and magnify images.

Concave lenses are commonly used in spectacles to correct myopia (nearsightedness).

Always connect an ammeter in series and a voltmeter in parallel to measure current and voltage, respectively.

Kilowatt-hour (kWh) is the unit of electrical energy used in electricity bills. 1 kWh = 1 unit of electricity.

Magnetic field lines always originate from the north pole and end at the south pole in closed loops.

A solenoid acts as a bar magnet when current flows through it. The magnetic field inside is strong and uniform.

Use Fleming's Left-Hand Rule for motors and Right-Hand Rule for generators.

The force on a conductor in a magnetic field is given by F = BIL sinθ, where θ is the angle between current and field.

The live wire carries current, the neutral wire completes the circuit, and the earth wire prevents electric shocks.

The suffix -yne in Ethyne indicates the presence of a triple bond in the hydrocarbon.

Combustion reactions are widely used in engines, cooking, and electricity generation.

Metals higher in the reactivity series displace metals lower in the series from their solutions.

pH plays a crucial role in chemical reactions, agriculture, and biological processes.

Bleaching powder is a strong oxidizing agent and is widely used in sanitation and textile industries.

Micelles are essential in soap and detergent action, allowing oils to be washed away with water.

Corrosion prevention methods include painting, oiling, galvanization, and using alloys like stainless steel.

Carbon's versatility is the reason for the vast diversity of organic compounds, essential for life and industry.

Vegetative propagation is widely used in agriculture for cloning plants with desirable traits, ensuring high yield and disease resistance.

Chlorophyll absorbs sunlight and drives the photosynthesis process.

The human heart beats about 72 times per minute in a healthy adult.

The ozone layer acts as Earth's protective shield. Avoiding CFCs and using eco-friendly alternatives like hydrofluorocarbons (HFCs) can help in ozone restoration.

The father’s sperm determines the sex of the child, as it carries both X and Y chromosomes, while the mother always contributes an X chromosome.

Mendel's experiments on pea plants demonstrated predictable patterns of inheritance, forming the basis of classical genetics.

Hormones act as messengers, coordinating various body functions. Balanced hormonal levels are essential for maintaining health and preventing disorders.