1. Mixture of Humus and rock particles called as ?
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<p>The mixture of humus and rock particles is called <strong>Soil</strong>.</p>
<p>Soil consists of mineral particles (from rocks) and organic matter (such as humus) that together support plant life.</p>
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2. Units of Mass ?
<p>The units of mass are <strong>Both</strong> grams and kilograms.</p>
<p>Grams and kilograms are commonly used units in the metric system to measure mass, with 1 kilogram equal to 1,000 grams.</p>
3. Which of following Crops grows in Red soil ?
<p>The crops that grow in red soil include <strong>All the above</strong>: wheat, rice, millets, and oil seeds. Red soil is known for its ability to support a variety of crops, particularly in regions with a warm climate.</p>
4. Which soil is suitable for growing Wheat and Grams ?
<p>Clayey and loamy soils are both suitable for growing wheat and grams:</p>
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<p><strong>Clayey Soil:</strong> This type of heavy soil retains water well, making it suitable for crops like wheat and grams. Incorporating humus can enhance its fertility.</p>
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<p><strong>Loamy Soil:</strong> Comprising a balanced mix of sand, silt, and clay (approximately 40–40–20%), loamy soil retains water and nutrients effectively while being easier to till than clayey soil.</p>
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<p>Wheat requires warm temperatures, plenty of sunlight, and adequate water for optimal growth. It does not thrive in highly acidic soils or those with poor drainage.</p>
5. Kharif crops are ?
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<p>Kharif crops are:</p>
<p><strong>All the above</strong> (Rice, Jowar, and Maize)</p>
<p>Kharif crops are typically sown with the onset of the monsoon season and harvested in the autumn. These crops thrive in warm, wet conditions, making them suitable for the rainy season in India.</p>
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6. Rabi season starts from ?
<p>The Rabi season in India generally starts from October and lasts until May, with crops being sown in the winter months and harvested in the spring.</p>
7. Kharif season starts from ?
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<p>The Kharif season in India typically starts with the onset of the southwest monsoon in June and lasts until October, when the harvesting of these crops begins.</p>
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8. Which of the following soil is used for making of pots, statues ?
<p><strong>Clayey soil</strong> is used for making pots, statues, and other earthenware due to its fine particles, high plasticity, and ability to retain shape when molded.</p>
9. Percolation rate of water is lesser in ?
<p><strong>Clayey soil </strong>has a low percolation rate because of its fine particles, which tightly pack together, slowing water movement through the soil.</p>
10. Percolation rate of water is higher in ?
<p><strong>Sandy soil</strong> has a higher percolation rate due to its large particles, which allow water to flow through more quickly compared to clayey or loamy soils.</p>
11. Formation of soil by breaking down of __________ ?
<p>Soil formation occurs through the breakdown of rocks into smaller particles by weathering processes, including physical, chemical, and biological actions.</p>
12. Dead material or matter present in soil is called as
<p>Humus is the organic component of soil, formed by the decomposition of leaves, dead plants, and other organic material, which enriches the soil.</p>
13. Hot or Warm Air always
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<p>Warm air rises due to lower density, while cooler air sinks, creating convection currents. This process influences weather patterns, forming clouds and causing wind, crucial for Earth's climate dynamics.</p>
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14. On cooling air, Air
<p>When air cools, its molecules slow down and move closer together, causing the air to contract and become denser.</p>
15. Air exerts ?
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<p>Air has weight, and as it presses down on the Earth's surface, it exerts atmospheric pressure. This pressure varies with altitude, temperature, and humidity.</p>
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16. Thunderstorms develops in ?
<p>Thunderstorms typically form in hot, humid tropical regions where the warm air rises, carrying moisture upward. This moisture condenses at higher altitudes, creating clouds and potentially leading to thunderstorms.</p>
17. During lighting, which of the following is safest place ?
<p>During lightning, the safest place is inside a car or bus.</p>
<p>These vehicles provide a protective metal shell that can redirect lightning strikes around the occupants. Open garages and storage sheds do not offer the same level of protection.</p>
18. Which of the following, tropical rain forest are found ?
<p>Tropical rainforests are found in various countries, including India (particularly in the northeastern region), Malaysia, and Uganda. These regions have the warm, humid conditions that support rich biodiversity typical of tropical rainforests.</p>
19. Tropical rain forests are found in ?
<p>Tropical rainforests are found in both the Western Ghats and Assam in India. The Western Ghats are known for their rich biodiversity and dense forests, while Assam, located in northeastern India, also has significant tropical rainforest areas, particularly in regions like Kaziranga National Park.</p>
20. Lion tailed Macaque is known as
<p>The lion-tailed macaque, also known as the <strong>beard ape</strong>, is distinguished by its light-colored mane. Endemic to the rainforests of the Western Ghats in India, it is endangered due to habitat loss, hunting, and illegal trade, with declining populations primarily found in Kerala's forests.</p>
21. Air moves from which regions ?
<p>Air moves from <strong>High air pressure to Low Pressure</strong>. This movement occurs because air tends to flow from areas of higher pressure to areas of lower pressure, creating wind.</p>
22. On heating air, Air ?
<p>On heating air, air <strong>Expands</strong>. When air is heated, its particles move faster and spread apart, causing the air to expand.</p>
23. Center of cyclones is called as eye of storm is also known as ?
<p>The center of cyclones, known as the "eye of the storm," is also referred to as <strong>Calm area</strong>. The eye is characterized by relatively calm weather and lower pressure compared to the surrounding storm.</p>
24. Breakdown of food in cells with energy release is called as ?
<p>The breakdown of food in cells with energy release is called <strong>Cellular respiration</strong>. This process involves converting glucose and oxygen into energy, carbon dioxide, and water, providing the energy needed for various cellular functions.</p>
25. Cramps in muscles occurs when muscle cell respire ?
<p>Cramps in muscles occur when muscle cells respire <strong>Anaerobic Respiration</strong>. This type of respiration happens when there is insufficient oxygen, leading to the production of lactic acid, which can cause muscle fatigue and cramps.</p>
26. Partial breakdown of Glucose releases ?
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<p>Partial breakdown of glucose releases <strong>Lactic acid</strong>. This occurs during anaerobic respiration when glucose is metabolized without enough oxygen, resulting in the production of lactic acid, especially in muscle cells during intense exercise.</p>
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27. During inhalations, Ribs moves _____ and diaphragm moves ___ ?
<p>During inhalation, ribs move <strong>Up-outwards</strong> and diaphragm moves <strong>down</strong>. This expansion of the rib cage and downward movement of the diaphragm increases the volume of the thoracic cavity, allowing air to be drawn into the lungs.</p>
28. Cockroach breathes through
<p>Cockroaches breathe through <strong>Tracheae</strong>. They have a network of small tubes called tracheae that transport oxygen directly to their tissues.</p>
29. Fish breathes through
<p>Fish breathe through <strong>Gills</strong>. Gills allow fish to extract oxygen from water as it passes over them.</p>
30. Which of the following helps in transportation of oxygen to all cells in the body ?
<p><strong>Hemoglobin</strong> is a protein found in red blood cells that binds to oxygen in the lungs and transports it to tissues throughout the body.</p>
31. Which of following fights against germs in our body ?
<p><strong>WBC (White Blood Cells)</strong> are responsible for fighting against infections and germs in the body, playing a crucial role in the immune system.</p>
32. Arteries carry blood from ?
<p>Arteries are blood vessels that carry oxygen-rich blood away from the heart to all parts of the body, ensuring that organs and tissues receive the oxygen and nutrients they need to function.</p>
33. Human hearts has ____ chambers ?
<p>The human heart has four chambers: the right atrium and ventricle, and the left atrium and ventricle. These chambers work together to pump oxygenated and deoxygenated blood throughout the body.</p>
34. Reptiles and amphibians hearts has ______ Chambers ?
<p>Reptiles and amphibians generally have <strong>3 chambers</strong> in their hearts. Specifically, they typically have two atria and one ventricle, which allows for some mixing of oxygenated and deoxygenated blood.</p>
35. Filtering of blood is done by blood capillaries in ?
<p>Filtering of blood is done by blood capillaries in the <strong>Kidneys</strong>. The kidneys contain tiny structures called nephrons, where the filtration of blood occurs to remove waste products and excess substances, forming urine.</p>
36. Urine contains ?
<p>rine contains <strong>Urea (2.5%)</strong>. Urea is a major component of urine, resulting from the breakdown of proteins in the body. It is one of the primary waste products excreted by the kidneys.</p>
37. In Plants, Transportation of water and nutrients is carried by vascular tissues called as ?
<p>In plants, the transportation of water and nutrients is carried by vascular tissues called <strong>Xylem</strong>.</p>
<p>Xylem is responsible for conducting water and dissolved minerals from the roots to the rest of the plant, while <strong>Phloem</strong> transports sugars and other organic compounds.</p>
38. In Plants, water is lost in form of water vapor during transpiration through ?
<p>In plants, water is lost in the form of water vapor during transpiration primarily through the <strong>Stomata</strong>. Stomata are tiny openings on the surfaces of leaves that allow for gas exchange and the release of water vapor.</p>
39. Water absorbed by roots is pulled up to reach the stem and leaves by ?
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<p>Water absorbed by roots is pulled up to reach the stem and leaves by <strong>Transpiration</strong>. This process involves the evaporation of water from the leaves, creating a negative pressure that helps draw water upward through the plant's xylem.</p>
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40. In humans, Average Heart beats in an adult ?
<p>In humans, the average heart beats in an adult is <strong>70 – 80 times per minute</strong>. This range can vary based on factors such as age, fitness level, and overall health.</p>
41. Circulatory system consists of ?
<p>The circulatory system consists of <strong>both a & b</strong> the heart and blood vessels. The heart pumps blood throughout the body, while blood vessels transport the blood to various tissues and organs.</p>
42. In Plants, Transportation of food to all parts is carried by vascular tissues called ?
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<p>In plants, the transportation of food to all parts is carried by vascular tissues called <strong>Phloem</strong>. Phloem is responsible for the transport of nutrients, especially sugars produced during photosynthesis.</p>
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43. Plants absorbs water and minerals by ?
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<p>Plants absorb water and minerals primarily through their <strong>roots</strong>. The roots take in water and essential nutrients from the soil, which are then transported to other parts of the plant.</p>
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44. Birds, Snakes and Lizards excretes ?
<p>Birds, snakes, and lizards excrete <strong>uric acid</strong>. This form of excretion conserves water, making it advantageous for these animals, especially in arid environments.</p>
45. Aquatic animals excretes ?
<p>Aquatic animals excrete <strong>ammonia</strong>. Ammonia is highly soluble in water and can be easily diluted, making it a suitable waste product for these organisms.</p>
46. Who discovered circulation of blood ?
<p>The circulation of blood was discovered by <strong>William Harvey</strong>. He described the blood circulation in detail in the 17th century, which was a significant advancement in the understanding of human anatomy and physiology.</p>
47. Human hearts, upper chamber and lower chamber called as ?
<p>The upper chambers of the human heart are called <strong>atria</strong>, and the lower chambers are called <strong>ventricles</strong>. So, the correct answer is <strong>Atria and Ventricles</strong>.</p>
48. Mammals, birds and crocodiles hearts has ______ Chambers ?
<p>Mammals, birds, and crocodiles possess a four-chambered heart, consisting of two atria and two ventricles. This structure efficiently separates oxygenated and deoxygenated blood, ensuring optimal circulation and oxygen delivery.</p>
49. Fish hearts has ______ Chambers ?
<p>Fish hearts have <strong>2 chambers</strong>. They consist of one atrium and one ventricle, which work together to pump blood through the gills for oxygenation and then to the rest of the body.</p>
50. Cockroach hearts has ______ Chambers ?
<p>Cockroach hearts have <strong>13 chambers</strong>. The heart is a long, tubular structure divided into these chambers, which help pump hemolymph (the equivalent of blood in insects) throughout the body.</p>
51. Veins has _______ walls ?
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<p>Veins have <strong>thin walls</strong>. Unlike arteries, veins have less muscular and elastic tissue, which allows them to be more flexible and accommodate varying volumes of blood.</p>
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52. In cell, glucose breaks down to which of the following components using oxygen ?
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<p>In cells, glucose breaks down to <strong>both carbon dioxide and water</strong> using oxygen. This process is known as <strong>aerobic respiration</strong>.</p>
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53. Breakdown of glucose using oxygen is called as ?
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<p><strong>Aerobic respiration</strong> is the process in which glucose is broken down with the use of oxygen to produce energy. It generates carbon dioxide and water as byproducts during this metabolic process.</p>
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54. Breakdown of glucose without use of oxygen is called as ?
<p>Anaerobic respiration refers to the process where glucose is broken down without oxygen, typically resulting in the production of energy along with byproducts like lactic acid or ethanol, depending on the organism.</p>
55. Which of the following organism can survives without oxygen ?
<p><strong>Yeast </strong>can survive without oxygen by obtaining energy through anaerobic respiration.</p>
<p>In the absence of oxygen, it undergoes fermentation, converting carbohydrates into carbon dioxide and alcohol.</p>
<p>This process is utilized in industries such as brewing and baking, showcasing yeast's important role in producing food and beverages through anaerobic respiration.</p>
56. Humans inhalation and exhalation ?
<p>During inhalation, humans breathe in oxygen from the environment, which is then transported to the lungs and bloodstream. During exhalation, carbon dioxide, a waste product, is expelled from the body.</p>
57. On Average, adult humans breathing rate ?
<p>The average breathing rate for adult humans is typically around 15 to 18 times per minute. This rate can vary based on factors like age, activity level, and health conditions.</p>
58. Humans inhales air ?
<p>Humans inhale air that contains: <strong>21% Oxygen and 0.04% Carbon dioxide.</strong></p>
<p>The composition of inhaled air is approximately 21% oxygen and around 0.04% carbon dioxide, with nitrogen making up the majority.</p>
59. Types of Blood Vessels?
<p>Blood vessels in the circulatory system primarily include arteries, which carry blood away from the heart, and veins, which carry blood back to the heart. Additionally, there are capillaries, which facilitate the exchange of oxygen, nutrients, and waste between blood and tissues.</p>
60. Arteries carries _______ rich blood ?
<p>Arteries carry oxygen-rich blood away from the heart to the body's tissues, with the exception of the pulmonary arteries, which carry oxygen-poor blood to the lungs.</p>
61. Veins carries _______ rich blood ?
<p>Veins carry carbon dioxide-rich blood back to the heart from the body's tissues, except for the pulmonary veins, which carry oxygen-rich blood from the lungs to the heart.</p>
62. Arteries has _______ walls ?
<p>Arteries have thick, elastic walls to withstand and maintain the high pressure of blood pumped from the heart.</p>
63. Veins carry blood from ?
<p>Veins are blood vessels that transport deoxygenated blood from various body parts back to the heart, ensuring proper circulation and oxygen replenishment through the lungs for overall body function.</p>
64. Blood is in red colour because of ?
<p>Blood is red due to hemoglobin, a protein in red blood cells that binds to oxygen and gives blood its characteristic color.</p>
65. Humans exhales air ?
<p>Humans exhale air composed of approximately 16.4% oxygen and 4.4% carbon dioxide, reflecting the exchange of gases during respiration, where oxygen is used and carbon dioxide is released.</p>
66. Which of following acid accumulation causes cramps in muscle ?
<p><strong>Lactic acid</strong> accumulates in muscles during intense physical activity, resulting in cramps and fatigue. This buildup occurs when the body’s oxygen supply is insufficient for energy production.</p>
67. In muscles, Glucose breakdown into which of the following component in absence of oxygen ?
<p>In the absence of oxygen, glucose undergoes anaerobic respiration in muscles, resulting in its breakdown into lactic acid. This process provides energy during intense physical activity when oxygen is limited.</p>
68. Glucose breakdown into which of the following products in the absence of oxygen ?
<p>In the absence of oxygen, glucose breaks down through fermentation, producing alcohol (ethanol) and carbon dioxide. This process occurs in yeast and some bacteria, enabling energy production without oxygen.</p>
69. Cells in human body can respire anaerobic ?
<p>Human cells can respire anaerobically, especially during intense exercise when oxygen levels drop, converting glucose into lactic acid for temporary energy.</p>
<p>This process is short-lived; prolonged anaerobic respiration leads to lactic acid buildup, causing fatigue and cramps. Once oxygen returns, aerobic respiration resumes for efficient energy production and lactic acid removal.</p>
70. Earthworm breathes through ?
<p>Earthworms breathe through their skin, utilizing diffusion to exchange gases. Their skin must remain moist to facilitate this process, allowing oxygen to enter and carbon dioxide to exit effectively.</p>
71. For Humans, Breathing of pure oxygen for long time is ?
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<p>Breathing pure oxygen for a long time can be unsafe for humans, as it may lead to oxygen toxicity, damaging lung tissue and other organs.</p>
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72. Fluid part of blood is called ?
<p>The fluid part of blood is called plasma, which carries cells, nutrients, hormones, and waste products throughout the body.</p>
73. A pushing or pulling of an object is called?
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<p>A pushing or pulling of an object is called <strong>force</strong>. Force causes an object to move, change its velocity, or shape, and is measured in newtons (N).</p>
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74. Which makes an object move from the rest?
<p><strong>Force</strong> is what causes an object to move from rest. It can initiate motion, stop it, or change its direction. The unit of force is the newton (N) in the International System.</p>
75. Friction is an example of?
<p><strong>Friction</strong> is an example of a <strong>contact force</strong> because it occurs when two surfaces come into contact with each other, resisting the relative motion between them.</p>
76. _____among the following exerts pressure?
<p>Both <strong>liquids</strong> and <strong>gases</strong> exert pressure. In liquids, pressure is exerted in all directions due to the weight of the liquid, while gases exert pressure through their molecules' movement.</p>
77. ____ among the following are fluids?
<p><strong>Gases</strong>, <strong>liquids</strong>, and <strong>oils</strong> are all considered fluids because they can flow and do not have a fixed shape, taking the shape of their container.</p>
78. In human beings voice is produced by the?
<p>In human beings, <strong>voice is produced by the larynx (voice box)</strong>. The larynx contains vocal cords that vibrate as air passes through them, generating sound that forms the voice.</p>
79. The to and fro motion of an object is called?
<p>The to and fro motion of an object is called <strong>oscillatory motion</strong>. It occurs when an object moves repeatedly back and forth around a central point, like a pendulum.</p>
80. ___ among the following are properties of sound?
<p><strong>Amplitude</strong> and <strong>frequency</strong> are both properties of sound. Amplitude determines the loudness of sound, while frequency determines the pitch. Together, they influence how we perceive sound.</p>
81. In which of the following material speed of sound is more?
<p>The speed of sound is faster in <strong>water</strong> compared to gases like hydrogen and air, and even plastic materials. Sound travels faster in liquids and solids than in gases due to closer particle arrangement.</p>
82. Pitch of sound ?
<p>The <strong>pitch of sound</strong> is <strong>independent of amplitude</strong>. Pitch depends on the frequency of the sound wave, not its amplitude. Higher frequency results in a higher pitch.</p>
83. ____ among the following is a layer of earth?
<p>The Earth consists of three main layers: the <strong>Crust</strong> (outermost layer), the <strong>Mantle</strong> (middle layer), and the <strong>Core</strong> (innermost layer). Each layer has distinct characteristics and composition.</p>
84. The device used to test the charge of an object is called?
<p>An <strong>electroscope</strong> is a device used to test the charge of an object. It detects the presence and type of electric charge by observing the movement of metal leaves or a needle.</p>
85. Intensity of sound ?
<p>The intensity of sound is <strong>independent of frequency</strong>. Intensity is determined by the wave's amplitude and energy, not by frequency, which only affects pitch.</p>
<p>Measured in watts per square meter (W/m²), intensity influences volume, while frequency, measured in Hertz (Hz), controls pitch.</p>
<p>Sound intensity also depends on factors like the vibrating body's surface area, the distance to the listener, and the medium's density.</p>
86. The process of depositing a layer on material by means of electricity is called as?
<p>The process of depositing a layer of material on another by means of electricity is called <strong>electroplating</strong>. It is commonly used to coat metals with a thin layer of another metal.</p>
87. _____ among the following is a lighting conductor?
<p>A <strong>copper plate</strong> is used as a lightning conductor due to copper's high electrical conductivity, allowing it to safely direct lightning's electric charge into the ground.</p>
88. ____ among the following is a good conductor of electricity?
<p><strong>Water</strong> (especially when containing impurities) and <strong>iron</strong> are both good conductors of electricity. Water conducts due to dissolved ions, and iron is a metal with free electrons that allow electric flow.</p>
89. The frequency determines _____ of a sound.
<p>The <strong>frequency</strong> of a sound wave determines both its <strong>pitch</strong> and <strong>shrillness</strong>. Higher frequency results in a higher pitch and a shriller sound, while lower frequency results in a lower pitch.</p>
90. Frequency is measured by ?
<p>A <strong>tonometer</strong> is used to measure the frequency of sound. It is commonly used in music and acoustics to determine pitch by measuring vibration frequency.</p>
91. Earth surface is divided into ____?
<p>The Earth's surface is divided into <strong>plates</strong> (tectonic plates) that move over time, and <strong>layers</strong> (crust, mantle, core) with distinct characteristics. Both are essential for understanding Earth's structure and geology.</p>
92. The inner layer of the earth is called?
<p>The <strong>core</strong> is the Earth's innermost layer, located beneath the mantle. It is primarily composed of iron and nickel and consists of a solid inner core and a liquid outer core.</p>
93. The middle most layer of the earth is called as?
<p>The <strong>mantle</strong> is the middle layer of the Earth, located between the crust and the core. It is made up of semi-solid rock and is responsible for the movement of tectonic plates.</p>
94. The upper layer of earth is called?
<p>The <strong>crust</strong> is the uppermost layer of the Earth. It is thin and solid, and it forms the surface on which we live. It is divided into oceanic and continental crust.</p>
95. Electric tower is a ____?
<p>An <strong>electric tower</strong> often functions as a <strong>lightning conductor</strong>. It is designed to direct lightning safely to the ground, protecting electrical infrastructure from damage.</p>
96. The process of transferring of charge from a charged body to the earth is referred as?
<p>The process of transferring charge from a charged body to the earth is referred to as <strong>earthing</strong>. It helps in neutralizing the charge and preventing electrical hazards.</p>
97. LED stands for?
<p><strong>LED</strong> stands for <strong>Light Emitting Diode</strong>, a semiconductor device that emits light when an electric current passes through it.</p>
98. Speed of sound ?
<p>The <strong>speed of sound</strong> is <strong>independent of pressure</strong> at a constant temperature. It primarily depends on the <strong>medium's density</strong> and <strong>temperature</strong>, rather than atmospheric pressure.</p>
99. The sound that are not detected by human beings are called as ___?
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<p>The sounds that are not detected by human beings are called <strong>inaudible sounds</strong>.</p>
<p>These include frequencies that are too high (ultrasonic) or too low (infrasonic) for the human ear to hear.</p>
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100. The loudness of sound of normal breathing is?
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<p>The <strong>loudness of normal breathing</strong> is typically around <strong>10 dB</strong>, which is quite faint. The noise levels you've shared are helpful in understanding the scale of sound intensity and its potential impact on hearing.</p>
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<li><strong>0 dB</strong>: The faintest sound detectable by the human ear.</li>
<li><strong>10 dB</strong>: Normal breathing, very faint.</li>
<li><strong>20 dB</strong>: A soft whisper at 5 feet.</li>
<li><strong>30 dB</strong>: A soft whisper.</li>
<li><strong>50 dB</strong>: Moderate rainfall.</li>
<li><strong>60 dB</strong>: Normal conversation.</li>
<li><strong>80 dB</strong>: Could cause discomfort if prolonged.</li>
<li><strong>110 dB</strong>: Shouting near the ear.</li>
<li><strong>120 dB</strong>: Thunder or very loud sounds, can cause hearing damage.</li>
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<p>Exposure to sounds above <strong>80 dB</strong> for extended periods can lead to hearing loss, which makes the safe listening range crucial.</p>
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101. Frequency is expressed in terms of?
<p><strong>Frequency</strong> is expressed in terms of <strong>Hertz (Hz)</strong>, which is the number of cycles or oscillations per second. One Hertz equals one cycle per second.</p>
102. The number of Oscillations per second is called as?
<p><strong>Frequency</strong> refers to the number of oscillations or cycles that occur per second in a sound wave or any periodic wave. It is measured in Hertz (Hz), representing cycles per second.</p>
103. The eardrum sends ____ to the inner ear?
<p>The eardrum converts sound waves into <strong>vibrations</strong> and sends these vibrations to the inner ear, where they are further processed to be interpreted as sound by the brain.</p>
104. Sound cannot travel through _____?
<p>Sound requires a medium (like air, water, or solids) to travel. It cannot travel through a <strong>vacuum</strong> because there are no particles to carry the sound waves.</p>
105. Sound needs _____ among the following for its propagation?
<p>Sound requires a <strong>medium</strong> (solid, liquid, or gas) to propagate, as it travels through the vibration of particles in the medium. It cannot travel through a vacuum.</p>
106. The strength of the force is usually expressed by its _____?
<p>The strength of a force is typically expressed by its <strong>magnitude</strong>, which represents the size or amount of force applied, often measured in units like newtons (N).</p>
107. Force can bring ___ among the following of an object?
<p>Force can bring a <strong>change in the state</strong> of an object, such as changing its motion (from rest to motion, or altering speed or direction). It can also cause deformation or change in shape.</p>
108. The unit for force ?
<p>The unit for force is the <strong>Newton (N)</strong>, named after Sir Isaac Newton, who formulated the laws of motion. 1 Newton is the force required to accelerate a 1 kg mass by 1 m/s².</p>
109. Unit of frequency ?
<p>The unit of frequency is <strong>Hz (Hertz)</strong>, which is equivalent to <strong>cycle/second</strong>. One Hertz represents one cycle (or oscillation) per second.</p>
110. The force resulting due to the action of muscles is known as ?
<p>The force resulting due to the action of muscles is known as <strong>Muscular force</strong>. It is the force exerted by the contraction of muscles in the human body to move objects or perform actions.</p>
111. Muscular force can be applied only through ?
<p>Muscular force can be applied only through <strong>contact force</strong>.</p>
<p>This is because muscular force requires direct physical contact to exert force on an object, typically through the muscles' contraction.</p>
112. Magnetic force is an example of?
<p>Magnetic force is an example of <strong>non-contact force</strong>. It can act at a distance without the need for physical contact between the objects, such as between magnets or magnetic fields.</p>
113. The force exerted by a charged body on another charged/uncharged body is known as?
<p>The force exerted by a charged body on another charged or uncharged body is known as <strong>electrostatic force</strong>. It is a <strong>non-contact force</strong> that acts at a distance.</p>
114. Every object in the universe exerts a force called?
<p>Every object in the universe exerts a force called <strong>gravitational force</strong>. It is an attractive force that acts between all objects with mass.</p>
115. The force acting on a unit area is called as?
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<p>The force acting on a unit area is called <strong>Pressure</strong>. It is calculated as the force applied divided by the area over which it is distributed.</p>
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116. The pressure exerted by the air is called?
<p>The pressure exerted by the air is called <strong>Atmospheric pressure</strong>. It is the force per unit area exerted on a surface by the weight of the air above it.</p>
117. The substance which reduce the friction are called as?
<p>The substance which reduces friction is called <strong>Lubricants</strong>. Lubricants, such as oil or grease, are used to reduce friction between surfaces in contact, making movement smoother.</p>
118. When a body rolls over the surface of another body, the resistance to the motion is called as?
<p>When a body rolls over the surface of another body, the resistance to the motion is called <strong>Rolling Friction</strong>. It is the frictional force that resists the rolling motion of an object over a surface.</p>
119. The frictional force exerted by fluids are also called as?
<p><strong>Drag</strong> is the force that opposes the motion of an object through a fluid.</p>
<p>It occurs due to friction between the object's surface and the fluid, and pressure differences around the object.</p>
<p>Factors like velocity, fluid density, and the object's shape affect the drag force, which can be quantified by specific formulas.</p>
120. ____ among the following increases friction?
<p><strong>Tyres and brake pads</strong> increase friction to provide better grip and control. Tyres grip the road, and brake pads create friction to slow or stop the vehicle.</p>
121. Water Vapour present in the atmosphere ?
<p><strong>Humidity</strong> refers to the amount of water vapor present in the atmosphere. Moisture is the general term for the presence of water in any form, while air refers to the mixture of gases, including water vapor.</p>
122. Units of Pressure ?
<p>Pressure can be measured in multiple units, including dyne/cm² (in the CGS system) and Pascal (Pa, the SI unit of pressure).</p>
123. During Inhalation, Lungs ?
<p>During inhalation, the diaphragm contracts and moves downward, and the intercostal muscles lift the ribcage, causing the lungs to expand and fill with air.</p>
124. Break down of food without using oxygen is called ?
<p><strong>Anaerobic respiration</strong> is the process of breaking down food (usually glucose) to release energy without using oxygen.</p>
<p>It typically occurs in muscle cells during intense activity or in certain microorganisms.</p>
125. Break down of food using oxygen is called ?
<p><strong>Aerobic respiration</strong> is the process of breaking down food (typically glucose) using oxygen to release energy.</p>
<p>This process occurs in the mitochondria of cells and produces carbon dioxide, water, and energy.</p>