:Basic Science Jss 2

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Quizzes Created: 6 | Total Attempts: 15,629
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Science Quizzes & Trivia

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Questions and Answers
  • 1. 

    1. Which of the following is NOT a process of heat transfer?

    • A.

      Option 1(a)insulation

    • B.

      B)radiation

    • C.

      C)conduction

    • D.

      )convection

    • E.

      Option 5

    Correct Answer
    A. Option 1(a)insulation
    Explanation
    Insulation is not a process of heat transfer. Insulation is a method used to prevent or reduce the transfer of heat between objects or areas. It involves using materials with low thermal conductivity to create a barrier that restricts the flow of heat. In contrast, radiation, conduction, and convection are all processes of heat transfer. Radiation is the transfer of heat through electromagnetic waves, conduction is the transfer of heat through direct contact between objects, and convection is the transfer of heat through the movement of fluids.

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  • 2. 

    2. The product of mass of an object and acceleration of free fall on it and distance moved is ........

    • A.

      (a)kinetic energy

    • B.

      Option 2 b)mechanical energy

    • C.

      Potential energy

    • D.

      (d)sound energy

    • E.

      Option 5

    Correct Answer
    C. Potential energy
    Explanation
    The product of mass, acceleration of free fall, and distance moved is known as potential energy. Potential energy is the energy possessed by an object due to its position or state. In this case, the given formula represents the potential energy of an object.

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  • 3. 

    3. Crude oil is a mixture of .............

    • A.

      A)stone

    • B.

      B)gravel

    • C.

      C)sand

    • D.

      D)hydrocarbons

    • E.

      Option 5

    Correct Answer
    D. D)hydrocarbons
    Explanation
    Crude oil is a fossil fuel that is formed from the remains of ancient plants and animals. It is composed mainly of hydrocarbons, which are organic compounds made up of hydrogen and carbon atoms. These hydrocarbons can vary in size and structure, resulting in different types of crude oil with varying properties. Therefore, the correct answer is d) hydrocarbons.

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  • 4. 

    4. ........ is not an excretory organ.

    • A.

      (a)kidney

    • B.

      (b)lung

    • C.

      C)anus

    • D.

      D)skin

    Correct Answer
    C. C)anus
    Explanation
    The anus is not considered an excretory organ because its primary function is to eliminate solid waste from the body, rather than excreting metabolic waste products. The kidneys, lungs, and skin are all involved in excretion processes. The kidneys filter waste products from the blood and produce urine, the lungs remove carbon dioxide through respiration, and the skin helps eliminate toxins through sweat. However, the anus is responsible for the elimination of feces, which is not considered a metabolic waste product.

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  • 5. 

    5. The blood vessels that carry blood to and away from the heart respectively are;

    • A.

      (a)veins and arteries

    • B.

      B)veins and capillaries

    • C.

      (c)arteries and capillaries

    • D.

      D)arteries and veins

    Correct Answer
    A. (a)veins and arteries
    Explanation
    Veins are blood vessels that carry blood away from the body's organs and tissues back to the heart. Arteries, on the other hand, carry oxygenated blood away from the heart to the body's organs and tissues. Therefore, veins and arteries are the blood vessels that carry blood to and away from the heart respectively.

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  • 6. 

    6. The brain of a man is divided into ........

    • A.

      (a)four

    • B.

      B)three

    • C.

      (c)five

    • D.

      D)two

    Correct Answer
    B. B)three
    Explanation
    The brain of a man is divided into three main parts: the cerebrum, the cerebellum, and the brainstem. The cerebrum is responsible for higher cognitive functions such as thinking, reasoning, and memory. The cerebellum is involved in coordination and balance. The brainstem controls basic functions such as breathing, heart rate, and digestion.

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  • 7. 

    7. Animals that live on land are ..........

    • A.

      Option 1 (a)Aquatic organisms

    • B.

      B)arboreal organisms

    • C.

      (c)terrestrial organisms

    • D.

      D)marsh organisms

    Correct Answer
    C. (c)terrestrial organisms
    Explanation
    The correct answer is (c) terrestrial organisms. Terrestrial organisms are animals that live on land, as opposed to aquatic organisms that live in water or arboreal organisms that live in trees. Marsh organisms specifically refer to animals that live in marshes, so they are not a suitable answer for this question.

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  • 8. 

    8. Which of the following is NOT a method of drug use?

    • A.

      (a)smoking

    • B.

      (b)injecting

    • C.

      C)tattooing

    • D.

      D)cutting

    • E.

      Option 5

    Correct Answer
    D. D)cutting
    Explanation
    The correct answer is d) cutting. Cutting is not a method of drug use. Smoking, injecting, and tattooing are all methods that can be used to introduce drugs into the body, but cutting is not typically used for this purpose.

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  • 9. 

    9. Examples of non-degradable materials are the following EXCEPT ..........

    • A.

      A)polythene bags

    • B.

      B)broken bottles

    • C.

      (c)dead animals

    • D.

      (d)rusty iron plates

    Correct Answer
    C. (c)dead animals
    Explanation
    Non-degradable materials are those that cannot be broken down or decomposed by natural processes. Polythene bags, broken bottles, and rusty iron plates are all examples of non-degradable materials because they do not break down easily and can persist in the environment for a long time. However, dead animals are biodegradable, meaning they can be broken down by bacteria, fungi, and other organisms. Therefore, dead animals are not an example of a non-degradable material.

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  • 10. 

    10. Which of the following is NOT a water pollution?

    • A.

      A)refuse

    • B.

      B)sewage

    • C.

      (c)oil spillage

    • D.

      (d)oxygen

    • E.

      Option 5

    Correct Answer
    D. (d)oxygen
    Explanation
    Oxygen is not a form of water pollution. Water pollution refers to the contamination of water bodies, such as rivers, lakes, and oceans, by harmful substances or pollutants. Refuse, sewage, and oil spillage are all examples of water pollution as they introduce pollutants into the water, causing harm to the aquatic ecosystem and potentially to human health. Oxygen, on the other hand, is a vital component of water and necessary for the survival of aquatic organisms.

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  • 11. 

    11. Which of the following is NOT a state of matter?

    • A.

      Solid

    • B.

      (b)liquid

    • C.

      C)gas

    • D.

      (d)space

    • E.

      Option 5

    Correct Answer
    D. (d)space
    Explanation
    Space is not considered a state of matter because it is not made up of particles like solids, liquids, and gases. Space is essentially a vacuum, devoid of any matter or particles. While it is true that there are celestial objects and phenomena in space, the space itself is not a state of matter.

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  • 12. 

    12. The secretion from the liver is called .......

    • A.

      (a)bile

    • B.

      (b)gallbladder

    • C.

      (c)gastric juice

    • D.

      (d)pancreatic juice

    Correct Answer
    A. (a)bile
    Explanation
    The secretion from the liver is called bile. Bile is a yellowish-green fluid that is produced by the liver and stored in the gallbladder. It plays a crucial role in the digestion and absorption of fats. Bile is released into the small intestine during digestion to help break down fats into smaller molecules, making them easier to absorb. It also helps in the elimination of waste products from the body, particularly bilirubin, a waste product of red blood cell breakdown.

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  • 13. 

    13. The organ which produces the female sex-cell in a mammal is the .......

    • A.

      (a)bladder

    • B.

      B)testis

    • C.

      C)ovary

    • D.

      (d)vagina

    Correct Answer
    C. C)ovary
    Explanation
    The organ which produces the female sex-cell in a mammal is the ovary. The ovary is a part of the female reproductive system and is responsible for producing and releasing eggs, or ova, during the process of ovulation. The ovaries also produce hormones such as estrogen and progesterone, which play a crucial role in regulating the menstrual cycle and supporting pregnancy.

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  • 14. 

    14. A coronavirus victim can be isolated for ....... days

    • A.

      (a)10

    • B.

      (b) 14

    • C.

       (c)12

    • D.

      (d)18

    Correct Answer
    B. (b) 14
    Explanation
    A coronavirus victim can be isolated for 14 days because this is the recommended period of time for quarantine as per the guidelines provided by health organizations such as the World Health Organization (WHO) and the Centers for Disease Control and Prevention (CDC). During this time, individuals who have been infected with the virus are expected to stay away from others to prevent the spread of the virus. This isolation period allows for the virus to run its course and for symptoms to subside, reducing the risk of transmission to others.

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  • 15. 

    15. The process by which living organisms produce their kind is called ..........

    • A.

      (a)digestion

    • B.

      (b)menstruation

    • C.

      C)production

    • D.

      (d)reproduction

    • E.

      Option 5

    • F.

      Option 6

    • G.

      Option 7

    • H.

      Option 8

    Correct Answer
    D. (d)reproduction
    Explanation
    The process by which living organisms produce their kind is called reproduction. This involves the production of offspring, either sexually or asexually, to ensure the continuation of the species. Digestion is the process of breaking down food for energy, menstruation is a specific reproductive process in female mammals, and production is a broad term that can refer to various activities but not specifically the production of offspring.

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  • 16. 

    16. ........ is the force of gravity acting on an object

    • A.

      (a)acceleration

    • B.

      (b)weight

    • C.

      (c)mass

    • D.

      (d)gravity

    Correct Answer
    B. (b)weight
    Explanation
    Weight is the force of gravity acting on an object. It is the measure of the gravitational force exerted on an object's mass. The weight of an object can vary depending on the strength of the gravitational field it is in. Weight is commonly measured in units of force, such as pounds or newtons.

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  • 17. 

    17. When solids change into liquid at appropriate temperature the process is called ...........

    • A.

      (a)evaporation

    • B.

      (b)melting

    • C.

      (c)boiling

    • D.

      (d)diffusion

    Correct Answer
    B. (b)melting
    Explanation
    When solids change into liquids at an appropriate temperature, the process is called melting. This occurs when the solid's particles gain enough energy to overcome the forces holding them together in a rigid structure, causing them to break free and move more freely as a liquid. Evaporation refers to the process of a liquid turning into a gas, boiling specifically refers to the rapid formation of bubbles within a liquid due to its vaporization, and diffusion refers to the movement of particles from an area of high concentration to an area of low concentration.

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  • 18. 

    18. HIV/AIDS can be transmitted through .......

    • A.

      (a)unsafe sex

    • B.

      (b)handshake

    • C.

      (c)insect bite

    • D.

      (d)sharing bed

    Correct Answer
    A. (a)unsafe sex
    Explanation
    HIV/AIDS can be transmitted through unsafe sex, which includes engaging in sexual activities without using protection such as condoms. This is because the virus can be present in the bodily fluids of an infected person, such as blood, semen, vaginal fluids, and breast milk. Therefore, engaging in unprotected sexual intercourse with an infected person can lead to the transmission of the virus.

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  • 19. 

    19. Which of the following instruments is used for measuring the temperature?

    • A.

      (a)barometer

    • B.

      (b)hydrometer

    • C.

      (c)thermometer

    • D.

      (d)hygrometer

    Correct Answer
    C. (c)thermometer
    Explanation
    A thermometer is an instrument used for measuring temperature. It consists of a narrow, sealed glass tube filled with a liquid, usually mercury or alcohol, which expands or contracts with changes in temperature. The temperature is indicated by the height of the liquid column inside the tube. A barometer is used to measure atmospheric pressure, a hydrometer is used to measure the density or specific gravity of a liquid, and a hygrometer is used to measure humidity in the air. Therefore, the correct instrument for measuring temperature is a thermometer.

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  • 20. 

    20. Drugs can be obtained from the following EXCEPT .........

    • A.

      (a)medicinal leaves

    • B.

      (b)plant barks

    • C.

      (c) food materials

    • D.

      (d)roots and shrubs.

    Correct Answer
    C. (c) food materials
    Explanation
    Drugs can be obtained from various sources such as medicinal leaves, plant barks, roots and shrubs. However, food materials do not typically contain substances that can be used as drugs. Therefore, the correct answer is (c) food materials.

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  • 21. 

    21.In clinical thermometer , the mercury can be replaced by ......

    • A.

      (a) water

    • B.

      (b)acid

    • C.

      C) an alcohol

    • D.

      D) a glucose

    Correct Answer
    C. C) an alcohol
    Explanation
    In a clinical thermometer, the mercury can be replaced by an alcohol. This is because alcohol has a lower boiling point compared to mercury, making it suitable for measuring body temperature accurately. Additionally, alcohol is less toxic and safer to use in medical instruments.

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  • 22. 

    22. ......... is the quantity of matter in a body

    • A.

      (a) mass

    • B.

      (a) mass

    • C.

      (c) volume

    • D.

      (d) space

    Correct Answer
    A. (a) mass
    Explanation
    Mass is the quantity of matter in a body. It is a measure of the amount of material an object contains. Mass is a fundamental property of matter and is independent of its location or the forces acting upon it. It is commonly measured in kilograms or grams.

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  • 23. 

    23. All are examples of habitat EXCEPT ..........

    • A.

      (a) Aquatic

    • B.

      (b) arboreal

    • C.

      (c)terrestrial

    • D.

      (d) ecology

    Correct Answer
    D. (d) ecology
    Explanation
    Ecology refers to the scientific study of the relationships between living organisms and their environments, rather than being a specific type of habitat. The other options (aquatic, arboreal, terrestrial) represent different types of habitats: aquatic refers to water habitats, arboreal refers to habitats in trees, and terrestrial refers to habitats on land.

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  • 24. 

    24. The instrument used in measuring the atmospheric pressure is ......

    • A.

      (a) barometer

    • B.

       (b) hydrometer

    • C.

      (c) thermometer

    • D.

      (d) potentiometer

    Correct Answer
    A. (a) barometer
    Explanation
    A barometer is the instrument used to measure atmospheric pressure. It works by measuring the height of a column of mercury or aneroid barometer, which changes with changes in atmospheric pressure. A hydrometer is used to measure the density or specific gravity of a liquid, a thermometer is used to measure temperature, and a potentiometer is used to measure electrical potential difference. None of these instruments are specifically designed to measure atmospheric pressure, making (a) barometer the correct answer.

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  • 25. 

    25. A dry cell stores ....... energy

    • A.

      (a) solar

    • B.

      (b) chemical

    • C.

      (c) nuclear

    • D.

      (d) sound

    Correct Answer
    B. (b) chemical
    Explanation
    A dry cell stores chemical energy. This type of battery uses a chemical reaction to generate electricity. The chemicals inside the cell react with each other to produce a flow of electrons, which can be used to power devices. This is different from other types of batteries, such as solar cells, which convert sunlight into electricity, or nuclear cells, which use nuclear reactions to generate power. Sound energy is not stored in a dry cell.

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  • 26. 

    26. The pelvic girdle is a set of bones located at the .......

    • A.

      (a) head

    • B.

      Option 2 (b) hip

    • C.

      (c) neck

    • D.

      (d) wrist

    Correct Answer
    B. Option 2 (b) hip
    Explanation
    The pelvic girdle is a set of bones located at the hip. The hip bones, also known as the innominate bones or coxal bones, make up the pelvic girdle and are connected to the sacrum at the back and to each other at the front. The pelvic girdle provides support and stability to the upper body and helps transfer weight from the spine to the lower limbs. It also protects the pelvic organs such as the bladder, reproductive organs, and part of the digestive system.

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  • 27. 

    27. The acid that is present in milk is ...... acid

    • A.

      (a) amino

    • B.

      (b) citric

    • C.

      (c) lactic

    • D.

      (d) sulphuric

    Correct Answer
    C. (c) lactic
    Explanation
    Milk contains lactic acid. This acid is produced by bacteria that ferment lactose, a sugar found in milk. Lactic acid gives milk its slightly sour taste and helps in the preservation of milk by preventing the growth of harmful bacteria. Therefore, the correct answer is (c) lactic acid.

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  • 28. 

    28. The world body which prevents and controls major diseases is ......

    • A.

      (a) W.H.O

    • B.

      (b) UNICEF

    • C.

      (c) UNESCO

    • D.

      (d) NMA

    Correct Answer
    A. (a) W.H.O
    Explanation
    The World Health Organization (W.H.O) is the world body that is responsible for preventing and controlling major diseases. It is an international organization that works to promote and improve global health, coordinate responses to health emergencies, and provide leadership on issues related to public health. W.H.O plays a crucial role in monitoring and responding to disease outbreaks, developing and implementing health policies, and providing technical assistance and support to countries in need. UNICEF, UNESCO, and NMA are not specifically focused on disease prevention and control, making W.H.O the correct answer.

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  • 29. 

    29.The chemical reaction between hydrogen gas and oxygen gas produces ........

    • A.

      (a) solid

    • B.

      ( b) gas

    • C.

      (c) water

    • D.

      (d) solvent

    Correct Answer
    C. (c) water
    Explanation
    The chemical reaction between hydrogen gas and oxygen gas produces water. This is because hydrogen and oxygen react to form water molecules through a process called combustion. In this reaction, hydrogen and oxygen atoms combine to form water molecules, which are in the liquid state. Therefore, the correct answer is (c) water.

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  • 30. 

    30. Which of these is an old method of preservation ?

    • A.

      (a) bottling

    • B.

      (b) canning

    • C.

      (c) refrigeration

    • D.

      (d) smoking

    • E.

      Option 5

    Correct Answer
    D. (d) smoking
    Explanation
    Smoking is an old method of preservation where food is exposed to smoke from burning wood or other materials. The smoke acts as a natural preservative by drying out the food and inhibiting the growth of bacteria and other microorganisms. This method has been used for centuries to preserve meats, fish, and other perishable foods. Bottling, canning, and refrigeration are relatively newer methods of preservation compared to smoking.

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  • 31. 

    31. .......... is the lightest known element ?

    • A.

      (a) hydrogen

    • B.

      (b) oxygen

    • C.

      (c) chlorine

    • D.

      (d) carbon

    Correct Answer
    A. (a) hydrogen
    Explanation
    Hydrogen is the lightest known element because it has the lowest atomic mass of all the elements. It has an atomic mass of 1, which is the lowest possible value. Oxygen, chlorine, and carbon all have higher atomic masses than hydrogen, making them heavier elements. Therefore, the correct answer is (a) hydrogen.

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  • 32. 

    32. The enzyme contained in saliva is called ......

    • A.

      (a) amylase

    • B.

      (b) ptyalin

    • C.

      (c) Pepsin

    • D.

      (d) Malta

    Correct Answer
    B. (b) ptyalin
    Explanation
    The enzyme contained in saliva is called ptyalin. Ptyalin is also known as salivary amylase and it helps in the breakdown of starches into simpler sugars. Pepsin is an enzyme found in the stomach that helps in the digestion of proteins. Malta is not an enzyme and does not have any relation to saliva or digestion.

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  • 33. 

    33. When a force moves through a distance , the result is ........

    • A.

      (a) work

    • B.

      (b) energy

    • C.

      (c) powe

    • D.

      (d) pressure

    Correct Answer
    A. (a) work
    Explanation
    When a force moves through a distance, the result is work. Work is defined as the product of the force applied on an object and the distance through which the force is applied. It is a measure of the energy transferred to or from an object by means of a force acting on it. Therefore, work is the correct answer in this context.

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  • 34. 

    34. In ROYGBIV, the letter I stand for .... colour.

    • A.

      (a) indices

    • B.

      (b) index

    • C.

      (c) indigo

    • D.

      (d) iodine

    Correct Answer
    C. (c) indigo
    Explanation
    In the acronym ROYGBIV, each letter represents a color in the visible light spectrum. R stands for red, O stands for orange, Y stands for yellow, G stands for green, B stands for blue, I stands for indigo, and V stands for violet. Therefore, the letter I in ROYGBIV stands for the color indigo.

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  • 35. 

    35. The primary source of energy to man is ......

    • A.

      (a) moon

    • B.

      (b) mercury

    • C.

      (c) star

    • D.

      (d) sun

    • E.

      Option 5

    • F.

      Option 6

    Correct Answer
    D. (d) sun
    Explanation
    The sun is the primary source of energy for humans. It provides heat and light, which are essential for various life processes on Earth. The energy from the sun is captured by plants through photosynthesis, and then transferred to animals and humans through the food chain. Additionally, solar energy is also harnessed through solar panels to generate electricity for various purposes.

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  • 36. 

    36. A break in the bone of man is ......

    • A.

      (a) fracture

    • B.

      (b) structure

    • C.

      (c) sore

    • D.

      (d) burn

    Correct Answer
    A. (a) fracture
    Explanation
    A break in the bone of a man is referred to as a fracture.

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  • 37. 

    37. Deficiency of protein causes ..... in man.

    • A.

      (a) scurvy

    • B.

      (b) beriberi

    • C.

      (c) kwaishokor

    • D.

      (d) headache

    Correct Answer
    C. (c) kwaishokor
    Explanation
    Deficiency of protein causes kwashiorkor in man. Kwashiorkor is a form of severe protein malnutrition that primarily affects children. It is characterized by symptoms such as swelling, fatigue, loss of muscle mass, and a distended abdomen. This condition occurs when there is a lack of protein in the diet, leading to a deficiency in essential amino acids necessary for growth and development. Scurvy is caused by a deficiency of vitamin C, beriberi is caused by a deficiency of thiamine, and headache can have various causes unrelated to protein deficiency.

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  • 38. 

      38. A large area of land that is thickly covered with trees is known as ......

    • A.

      (a)habitat

    • B.

      (b) forest

    • C.

      (c) shrub

    • D.

      (d) shel

    Correct Answer
    B. (b) forest
    Explanation
    A large area of land that is thickly covered with trees is known as a forest. Forests are characterized by their dense tree cover and are home to a wide variety of plant and animal species. They play a crucial role in maintaining the ecological balance, providing habitats for wildlife, and contributing to the overall health of the planet.

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  • 39. 

    39.The boiling of water is ....... change.

    • A.

      (a) biological

    • B.

      (b)magnetic

    • C.

      (c) physical

    • D.

      (d) chemical

    Correct Answer
    C. (c) physical
    Explanation
    The boiling of water is a physical change because it involves a change in the state of matter from liquid to gas, without any alteration in the chemical composition of water.

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  • 40. 

    40. The connective tissue between two joints is called ........

    • A.

      (a) bone

    • B.

      (b) cartilage

    • C.

      (c) ligament

    • D.

      (d) tendon

    Correct Answer
    C. (c) ligament
    Explanation
    The connective tissue between two joints is called a ligament. Ligaments are tough, fibrous bands that connect bones to other bones, providing stability and support to the joints. They help to prevent excessive movement and maintain the proper alignment of the bones within the joint. Ligaments are made up of collagen fibers and are highly elastic, allowing them to stretch and recoil to accommodate joint movement. Unlike tendons, which connect muscles to bones, ligaments do not have the ability to contract or generate force.

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  • 41. 

    41. Sense organs include the following EXCEPT .......

    • A.

      (a) eye

    • B.

      (b) hair

    • C.

      (c) nose

    • D.

      D) skin

    Correct Answer
    B. (b) hair
    Explanation
    Sense organs are organs that receive and process sensory information from the environment. The eye is responsible for vision, the nose is responsible for smell, and the skin is responsible for touch. Hair, on the other hand, is not considered a sense organ as it does not have the ability to receive and process sensory information. Therefore, the correct answer is (b) hair.

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  • 42. 

    42. Which of the following is NOT a water -borne disease ?

    • A.

      (a) measles

    • B.

      (b) dysentery

    • C.

      (c) cholera

    • D.

      (d) typhoid

    Correct Answer
    A. (a) measles
    Explanation
    Measles is not a water-borne disease because it is primarily transmitted through respiratory droplets from infected individuals. It is caused by a virus and is highly contagious, but it is not spread through contaminated water sources like dysentery, cholera, and typhoid.

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  • 43. 

    43. The cell that helps to fight germs in the body is called ........

    • A.

      (a) red blood cell

    • B.

      (b) white blood cell

    • C.

      (c) bone cell

    • D.

      (d) water cell

    Correct Answer
    B. (b) white blood cell
    Explanation
    White blood cells, also known as leukocytes, are responsible for fighting off germs and infections in the body. They are a crucial part of the immune system and help to defend against bacteria, viruses, and other harmful pathogens. Red blood cells are responsible for carrying oxygen, bone cells are responsible for maintaining the structure of the bones, and there is no such thing as a "water cell". Therefore, the correct answer is (b) white blood cell.

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  • 44. 

    44. All these food substances contain protein EXCEPT .....

    • A.

      (a) egg

    • B.

      (b) beans

    • C.

      C) fish

    • D.

      (d) rice

    Correct Answer
    D. (d) rice
    Explanation
    Rice is a carbohydrate-rich food and does not contain a significant amount of protein compared to the other options listed. Eggs, beans, and fish are all excellent sources of protein.

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  • 45. 

    45. These diseases can be immunized EXCEPT ......

    • A.

      (a) tuberculosis

    • B.

      (b) polio

    • C.

      (c) headache

    • D.

      (d) measles

    Correct Answer
    C. (c) headache
    Explanation
    Headache is not a disease that can be immunized. It is a symptom of various underlying causes such as stress, tension, migraine, or sinus problems. Immunization is the process of providing immunity against specific diseases through vaccines. Tuberculosis, polio, and measles are all diseases that can be prevented through immunization.

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  • 46. 

    46. The structural and functional unit of life is ......

    • A.

      (a) cell

    • B.

      (b) organ

    • C.

      (c) tissue

    • D.

      (d) system

    Correct Answer
    A. (a) cell
    Explanation
    The structural and functional unit of life is the cell. Cells are the basic building blocks of all living organisms and are responsible for carrying out all the necessary functions for life. They are capable of reproducing, obtaining nutrients, eliminating waste, and carrying out various metabolic activities. Cells can exist as single-celled organisms or as part of a larger organism, working together to maintain homeostasis and ensure the survival of the organism.

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  • 47. 

    47. ...... joint is the type of joint that moves in all directions .

    • A.

      (a) pivot

    • B.

      (b) ball and socket

    • C.

      (c) hinge

    • D.

      (d) slight

    Correct Answer
    B. (b) ball and socket
    Explanation
    A ball and socket joint is a type of joint that allows movement in all directions. It consists of a rounded end of one bone (ball) that fits into a cup-like socket of another bone. This joint provides a wide range of motion and allows for movements such as rotation, flexion, extension, abduction, and adduction. Examples of ball and socket joints in the human body include the shoulder and hip joints.

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  • 48. 

    48. All these are examples of mammals EXCEPT ......

    • A.

       (a) go at

    • B.

      (b) man

    • C.

      (c) whale

    • D.

      (d) fish

    • E.

      Option 5

    Correct Answer
    D. (d) fish
    Explanation
    Fish are not mammals. Mammals are warm-blooded vertebrates that have hair or fur, produce milk to feed their young, and give birth to live young. Fish, on the other hand, are cold-blooded vertebrates that typically have scales and lay eggs. Therefore, fish do not belong to the category of mammals.

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  • 49. 

    49. Steel is an alloy of iron and ......

    • A.

      (a) zinc

    • B.

      (b) carbon

    • C.

      (c) gold

    • D.

      (d) lead

    Correct Answer
    B. (b) carbon
    Explanation
    Steel is an alloy of iron and carbon. Carbon is added to iron in varying amounts to create steel with different properties. The carbon content in steel can range from 0.2% to 2.1% by weight. The addition of carbon improves the hardness, strength, and overall durability of the steel. Therefore, option (b) carbon is the correct answer.

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  • 50. 

    50. All these are examples of separating techniques EXCEPT

    • A.

      (a) filtration

    • B.

      (b) decantation

    • C.

      (c) distillation

    • D.

      (d) titration

    • E.

      Option 5

    • F.

      Option 6

    Correct Answer
    D. (d) titration
    Explanation
    Filtration, decantation, and distillation are all examples of separating techniques used to separate mixtures based on their physical properties such as size, density, or boiling point. Filtration is used to separate solid particles from a liquid or gas by passing it through a porous material. Decantation is the process of separating a liquid from a solid by carefully pouring off the liquid without disturbing the solid. Distillation is a technique used to separate mixtures based on differences in boiling points. Titration, on the other hand, is a technique used to determine the concentration of a substance in a solution by adding a solution of known concentration until the reaction is complete. It is not a technique used for separating mixtures.

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  • Current Version
  • May 26, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 25, 2020
    Quiz Created by
    Educationdistric
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