HRCA Science Grade 7-8 PDF

## HRCA - Science Grade 7-8 ### Page 1 1. Human beings get food from: * Plants * Animals * Both 2. The distance travelled per unit of time is called: * Speed * Gravity * Force * Energy 3. Typhoid and polio spread by faecal oral route. If we want to prev...

## HRCA - Science Grade 7-8 ### Page 1 1. Human beings get food from: * Plants * Animals * Both 2. The distance travelled per unit of time is called: * Speed * Gravity * Force * Energy 3. Typhoid and polio spread by faecal oral route. If we want to prevent such diseases in our area we should: * Control mosquitoes * Control air pollution * Improve hospitals * Improve sanitation and hygiene condition 4. The number of electrons in Aluminum is: * 14 * 13 * 12 5. Transmits message from one part of the body to another: * Vein * Nerve * Cell * Motor neuron 6. There are _ laws of motion. * Two * Three * Four * Five 7. Many axons present side by side and enclosed in a common sheath: * Nerve cell * Nerve * Dendrite * Spinal cord 8. There are _ pairs of nerves in the human body. * 37 * 43 * 31 * 34 9. Neurons transmit messages in the form of electrochemical waves called: * Sensory neurons * Motor neurons * Inter neurons * Nerve impulses 10. Light wave, radio wave, and X-ray are examples of: * Transverse waves * Longitudinal wave * S-seismic waves 11. Which of the following is _not_ a mixture? * Air * Pure water * Sea water * Lemonade 12. The system that moves blood throughout the body is called the _ system. * Respiratory * Circulatory * Photosynthesis 13. Cellular respiration always requires: * Glucose and oxygen * Glucose, oxygen and carbon dioxide * Alcohol, lactic acid, and carbon dioxide 14. How does light travel in air? * In a circle * Along a curved path * Along a straight line * In a dispersed path 15. Vascular bundles are present in every part of the plant. They are made up of : * Xylem only * Phloem only * Xylem and phloem * Xylem, phloem and root hair cells 16. A tube which arises from each kidney and enters the urinary bladder is called: * Convex * Ureter * Concave * Urethra ### Page 2 17. Reading, writing, driving, and speaking are _ actions. * Voluntary * Involuntary * Both 18. Material that traps air like fur, wool, and sawdust are _ heat. * Insulator * Conductors * Reflectors * Convectional devices 19. What is the formula for calculating speed? * Time/Distance * Distance/Time * Distance x Time * Frequency x Time 20. A person affected with anemia looks pale and feels tired. All his body cells are getting: * Less food * Less oxygen * Less water * Less carbon dioxide 21. Who discovered gravity? * Edwin Hubble * Isaac Newton * Thomas Jefferson * Albert Einstein 22. _ can spread from one person to another person. * Membrane * Vaccination * Germs 23. The part of the body which filters nitrogenous waste from blood: * Liver * Kidney * Intestine * Stomach 24. The flat green portion of a leaf is called: * Midrib * Leaves * Blade 25. The removal of nitrogenous waste material from the body is called: * Reflex arc * Voluntary * Involuntary * Excretion 26. If it takes place in the presence of oxygen it is called: * Cellular respiration * Anaerobic 27. The right atrium receives _ blood. * Deoxygenated * Oxygenated 28. In humans, a sperm has 23 chromosomes. An egg cell has: * 23 chromosomes * 46 chromosomes * No chromosomes * 69 chromosomes 29. The brain of an adult human weights between _ grams. * 1300 and 1400 * 1500 and 1600 * 1800 and 1900 * 1900 and 2000 30. The part of the nephron where reabsorption of useful materials occurs from filtrate to blood: * Glomerulus * Renal tubule * Collecting duct * Bowman's capsule 31. Oxygen has 8 protons, 8 neutrons, and _ electrons. * 8 * 9 * 10 32. When you have a toothache, you feel pain because: * There is a cavity in your tooth * Tiny bits of food are left between your teeth * Bacteria digest the food left in teeth and produce an acid. 33. Use of hand sanitiser helps in: * Killing germs from the skin and keeping it safe. * Growing germs. * Keeping skin unsafe. * Keeping skin moisturized. 34. What may be the objectives of genetic modifications of plants? * Production of disease resistant plants * Improvement in nutritional quality of plants * Production of herbicide resistant plants * All of these 35. The center of the atom is called a _ . * Cells * Nucleus * Organisms 36. If a solid is dissolved in a liquid, it is called a solution, what is the liquid called? * Solute * Solvent * Suspension * Sediment 37. The chambers of the heart which receive oxygen rich blood from the lungs: * Right and left atrium * Right and left ventricle * Right atrium and right ventricle * Left atrium and left ventricle 38. The heat transfer that occurs due to a density difference in fluids is: * Radiation * Convection * Conduction * Insulation 39. Plants perform respiration: * Only during daytime * All the time * At night time only 40. The nucleus of an atom contains: * Proton, electron, and neutrons * Electrons and protons * Proton and electron * Protons and neutrons 41. The function of nephron is to: * Store urine * Form urine * Push out urine from urinary bladder * Break stones of kidneys 42. Substances which expands on heating, regain their original shape on cooling without forming any new substances. This change is a _ change. * Physical * Chemical 43. The major organ of the excretory system is: * Intestine * Liver * Kidney * Lungs 44. There are _ pairs of cranial nerves. * 11 * 12 * 13 * 24 45. Each DNA molecules is made of thousands of small units called: * Adenine * Nucleotides * Cytosine * Guanine 46. Which component of blood is liquid? * Plasma * Red blood cell * White blood cell * Platelets 47. The cells which are produced as a result of cell division cells are called: * Cell * Parent cell * Daughter cell 48. The characters which are passed from parents to offspring: * Inheritable characters * Non-inheritable characters * Environmental characters * Natural characters ### Page 3 49. Electromagnetic waves travel with the speed of light in a vacuum _ kilometer per second. * 200,000 * 300,000 * 400,000 * 500,000 50. What is friction? * A substance * A solid * A gas * A force 51. Respiratory system-related diseases mostly spread through: * Water * Food * Blood * Droplets in air 52. The smallest particle of the element is: * Molecule * Atom * Cell * DNA 53. Which of the following is the best conductor? * Wood * Plastic * Water * Metal 54. If the concentration of carbon dioxide increases in the air during daytime, the process of: * Photosynthesis will decrease * Respiration will decrease * Photosynthesis will increase * Respiration will increase 55. The reason for a physical change to be named as: * Change occurs only in physical properties * Transfer of energy takes place * Is a reversible change * All of them 56. There are over _ nephrons in each kidney. * One million * Two million * Three million * Four million 57. Which of the following is not a biotechnology product? * Insulin * Quinine * Beta-endorphin * Interferon 58. The protective layer around plant parts is: * Epidermis * Cortex * Mesophyll * Vascular bundle 59. The best definition of force is: * A push or pull * Stored energy * Energy in motion * Anything that takes up space 60. The organisms whose cells and plasmids are usually used in genetic engineering are: * Bacteria * Fungi * Algae * Algae and fungi 61. Mitosis occurs only in _ cells. * Germs * Somatic * Both * None 62. Every action has a reaction equal in magnitude but: * Opposite in direction * Perpendicular in direction * Parallel in direction * Anti parallel in direction 63. A force that opposes motion between two surfaces is called: * Speed * Acceleration * Weight * Friction 64. Which of the processes below involves a change in state? * Evaporation * Condensation * Sublimation * All of the above ### Page 4 65. The body actions which are performed without involvement of thinking processes are called _ actions. * Voluntary * Involuntary * Effectors * Receptors 66. Arteries branch off into tiny vessels called: * Capillaries * Blood vessels * Arterioles 67. Cellular respiration has _ types. * One * Two * Three * Four 68. The section of DNA which has information for making a specific protein is called: * DNA strand * Gene * Chromosomes * Nucleotide 69. The instrument used by doctors for listening to heartbeats is called: * Stethoscope * Microscope * Periscope * Ophthalmoscope 70. The periodic table has _ horizontal rows. * 10 * 15 71. The atomic number of Sulfur is: * 17 * 16 * 18 72. _ are used as cooling agents in refrigerators. * CFCs * Ozone * Sulphur oxide * Helium 73. Hepatitis A, B, C, and D, Covid-19, and dengue fever are caused by: * Infection * Disease * Viruses 74. The parts of a neuron which receive messages are: * Cell bodies * Dendrites * Axons * Nuclei 75. Photosynthesis will not occur in leaves in the absence of : * Guard cell * Chlorophyll * Vacuole * Space between cell 76. Which of the following is involved in the transport of food in plants? * Xylem * Phloem * Epidermis * Mesophyll 77. Transmissions and integrations of information are possible through: * Epithelial tissue * Connective tissue * Muscle tissue * Nervous tissue 78. A person is swimming in a pool, swimming is an example of: * Friction * Gravity * Action and reaction forces 79. Innate, adaptive, and passive immunity are three main types of immunity. * TRUE * FALSE 80. _ is the part of the cell which controls the activities of the whole cell. * DNA * Nucleus * Chromosomes * Gametes ### Page 5 81. When objects are heated, the distance between molecules: * Increases * Decreases * Remain same * Not effected 82. Which one is not a way to preserve food? * Freezing * Pickling * Curing * Garnishing 83. Characteristic of matter exhibited without a change in its identity is: * Physical property * Chemical property * Thermal property * None of these 84. Cell makes copies of its chromosomes during: * Interphase * Nuclear division of mitosis * Nuclear division of meiosis * Cytokinesis 85. Ozone is a layer of gases in the _ atmosphere of the earth. * Upper * Lower * Middle * Inner 86. Living components of the ecosystem are: * Abiotic * Biotic * Both a and b 87. The word acid means: * Sour * Sweet * Salty * Spicy 88. Glowing of an electric bulb is a _ change. * Physical * Chemical * Both physical and chemical. * None of these 89. Which material will expand on heating? * Solids * Liquids * Gases * All of these 90. The exchange of gases between blood and air takes place at: * Trachea * Bronchi * Bronchioles * Alveoli 91. Speed is equal to distance divided by time. * TRUE * FALSE 92. Hindbrain consists of _ parts. * Four * Three * Five * Two 93. Fungi is a: * Parasite * Autotroph * Insectivore * Saprotroph 94. If you stay under trees at night, you can feel dizziness due to; * High level of oxygen and low level of carbon dioxide. * Low level of oxygen and high level of carbon dioxide. * Poisonous gases released by trees. * Ghost living in trees. 95. Human beings can be categorized as: * Parasite * Heterotrophs * Saprotrophs * Autotrophs 96. The exchange of substances between blood and body cells can take place at the: * Capillaries * Veins * Arteries * Heart * Both a and b ### Page 6 97. The speed of an object with a specific direction is known as: * Velocity * Gravity * Friction * Speed 98. Sensory neurons carry messages towards: * Muscles * Muscles and glands * Sense organs * Brain and spinal cord 99. The main root of the primary root system: * Fibrous root * Taproot * Root nodules 100. _ is an oval structure present beneath midbrain. * Pons * Medulla * Spinal cord * Thalamus 101. Biodiversity means: * Various types of living things found at a particular place. * Same types of living things found at a particular place. 102. Protons carry: * Positive charge * Negative charge * Positive and negative * No electric charge 103. Neutrons carry: * Positive charge * Unit charge * Negative charge * No electric charge 104. When the skin is damaged, bacteria enter our body, which line of defense is crossed these bacteria? * First line of defense * Second line of defense * Third line of defense * Fourth line of defense 105. Parasites obtain their food from: * Insects * Plants * Animals * All of these 106. _ is essential for all living organisms: * Proteins * Fat * Food * None of these 107. _ controls many sensory functions. * Thalamus * Hypothalamus * Cerebellum * Medulla 108. The organisms which prepare their own food are known as: * Saprotrophs * Autotrophs * Heterotrophs * None of these 109. _ are special proteins in blood which can recognise and kill viruses and bacteria. * Immune * Response * Antibodies 110. Which is the best method to prevent rusting? * Painting * Greasing * Galvanization * Precipitation 111. Our heartbeat, blood pressure, vomiting is controlled by: * Cerebrum * Cerebellum * Medulla oblongata * Spinal cord 112. The change of milk into yogurt is: * Physical change * Chemical change * Climate change * Change of color ### Page 7 97. The speed of an object with a specific direction is known as: * Velocity * Gravity * Friction * Speed 98. Sensory neurons carry messages towards: * Muscles * Muscles and glands * Sense organs * Brain and spinal cord 99. The main root of the primary root system: * Fibrous root * Taproot * Root nodules 100. _ is an oval structure present beneath midbrain. * Pons * Medulla * Spinal cord * Thalamus 101. Biodiversity means: * Various types of living things found at a particular place. * Same types of living things found at a particular place. 102. Protons carry: * Positive charge * Negative charge * Positive and negative * No electric charge 103. Neutrons carry: * Positive charge * Unit charge * Negative charge * No electric charge 104. When the skin is damaged, bacteria enter our body, which line of defense is crossed these bacteria? * First line of defense * Second line of defense * Third line of defense * Fourth line of defense 105. Parasites obtain their food from: * Insects * Plants * Animals * All of these 106. _ is essential for all living organisms. * Proteins * Fat * Food * None of these. 107. _ controls many sensory functions. * Thalamus * Hypothalamus * Cerebellum * Medulla 108. The organisms which prepare their own food are known as: * Saprotrophs * Autotrophs * Heterotrophs * None of these 109. _ are special proteins in blood which can recognize and kill viruses and bacteria. * Immune * Response * Antibodies 110. Which is the best method to prevent rusting? * Painting * Greasing * Galvanization * Precipitation 111. Our heartbeat, blood pressure, vomiting is controlled by: * Cerebrum * Cerebellum * Medulla oblongata * Spinal cord 112. The change of milk into yogurt is: * Physical change * Chemical change * Climate change * Change of color