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CBSE Class 10th Science Mix Test - 11

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CBSE Class 10th Science Mix Test - 11
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  • Question 1
    1 / -0

    When ester is treated with an alkali, the reaction gives ethanol and sodium ethanoate. This reaction is called

    Solution

    When ester is treated with an alkali, the reaction gives ethanol and sodium ethanoate. This reaction is called saponification reaction because this reaction forms the basis of preparation of soap. This can be given by following equation:

    \(CH_3COOC_2H_5+NaOH\) \(\longrightarrow CH_3COONa+\) \(C_2H_5OH\)

  • Question 2
    1 / -0

    \(2KBr+BaI_2\longrightarrow\) \(2KI+BaBr_2\)

    This reaction is a type of :

    Solution

    \(2KBr+BaI_2\longrightarrow\) \(2KI+BaBr_2\)

    In this reaction, both the reactants exchanges ions for two new products, hence it is a double displacement reaction. 

  • Question 3
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    Assertion(A): Genes control characteristics or traits.

    Reason(R): A section of DNA that provides information for one protein is called the gene for that protein, and proteins control the characteristics.

  • Question 4
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    Assertion(A): Acquired trait cannot be passed to progeny, while inherited traits can be.

    Reason(R): Acquired trait do not bring changes in the DNA of germ cell instead bring in somatic cells, while genes of inherited traits are present in DNA of germ cell.

  • Question 5
    1 / -0

    Assertion(A): Copper oxide in a beaker is added with dilute HCl when copper (II) chloride is formed.

    Reason(R): The colour of solution becomes brown and the copper oxide dissolves.

    Solution

    The colour of solution formed is blue green and copper chloride is formed.

    \(2HCl+CuO\longrightarrow\) \(CuCl_2+H_2O\)

  • Question 6
    1 / -0

    Baking soda is prepared by the which of the following process ?

    Solution

    Baking soda is the common name of sodium bicarbonate \((NaHCO_3)\).

    Solvay process: is used for the production of \((NaHCO_3)\)

  • Question 7
    1 / -0

    The increase in the contaminated substances caused by the intoxicating environment is called :

    Solution

    Biomagnification or biological magnification is defined as the rise or increase in the contaminated substances caused by the intoxicating environment. The contaminants might be heavy metals such as mercury, arsenic and pesticides such as polychlorinated biphenyls and DDT.

    These substances are taken up by the organisms through the food they consume. When the organisms in the higher food chain feed on the organisms in the lower food chain containing these toxins, these toxins get accumulated in the higher organisms. The levels of biological magnification is different at different levels of the ecosystem. It increases with each successive trophic level.    

  • Question 8
    1 / -0

    All bases do not dissolve in water. An alkali is a base that dissolves in water. They are soapy to touch, bitter and corrosive. Tasting or touching them may cause harm to us

    \(Acid+base\longrightarrow......+Water\)

  • Question 9
    1 / -0

    All bases do not dissolve in water. An alkali is a base that dissolves in water. They are soapy to touch, bitter and corrosive. Tasting or touching them may cause harm to us

    Bases generate ........ ions in water

  • Question 10
    1 / -0

    All bases do not dissolve in water. An alkali is a base that dissolves in water. They are soapy to touch, bitter and corrosive. Tasting or touching them may cause harm to us

    A number representing hydronium ion concentration indicating the acidic or basic nature of solution as:

  • Question 11
    1 / -0

    All bases do not dissolve in water. An alkali is a base that dissolves in water. They are soapy to touch, bitter and corrosive. Tasting or touching them may cause harm to us

    Decrease in \(H^+\) ion concentration indicates

  • Question 12
    1 / -0

    All bases do not dissolve in water. An alkali is a base that dissolves in water. They are soapy to touch, bitter and corrosive. Tasting or touching them may cause harm to us

    Blood is:

    Solution

    Blood is normally slightly basic, with a normal PH range of about 7.35 to 7.45.

  • Question 13
    1 / -0

    Sexual reproduction gives rise to more viable ........ then asexual reproduction.

    Solution

    Sexual reproduction gives rise to more viable variation then asexual reproduction. Because in sexual reproduction, genetic material from both the patents mixed (recombination of parent chromosomes) by fertilization. Hence, offsprings get both the information and produce mixed characters which are not exactly the same as that of parents. While in asexual reproduction, the single parent is involved and thus there is no recombination of chromosomes. Hence, offsprings that produced are the exact copy of their parent.

  • Question 14
    1 / -0

    Urine originates in ........ .

    Solution

    In all humans, urine originates in the kidney and is discharged through the urethra. Water, urea, salts and pigments form the urine in our body.

  • Question 15
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    The metals like Na and Mg are towards the left-hand side of the periodic table while nonmetals like sulphur and chlorine are found on the right-hand side. In the middle, we have silicon, which is classified as a semi-metal or metalloid.

    Elements in the middle of periodic table, is classified as metalloid because:

  • Question 16
    1 / -0

    The metals like Na and Mg are towards the left-hand side of the periodic table while nonmetals like sulphur and chlorine are found on the right-hand side. In the middle, we have silicon, which is classified as a semi-metal or metalloid.

    Metals on the left-hand side are reactive because

  • Question 17
    1 / -0

    The metals like Na and Mg are towards the left-hand side of the periodic table while nonmetals like sulphur and chlorine are found on the right-hand side. In the middle, we have silicon, which is classified as a semi-metal or metalloid.

    Metallic character .....  across a period as one goes from left to right

  • Question 18
    1 / -0

    The metals like Na and Mg are towards the left-hand side of the periodic table while nonmetals like sulphur and chlorine are found on the right-hand side. In the middle, we have silicon, which is classified as a semi-metal or metalloid. 

    Oxides of metals are ...... and that of non- metals are ...... in general.

  • Question 19
    1 / -0

    The metals like Na and Mg are towards the left-hand side of the periodic table while nonmetals like sulphur and chlorine are found on the right-hand side. In the middle, we have silicon, which is classified as a semi-metal or metalloid. 

    Non- metals are electronegative because:

  • Question 20
    1 / -0

    Ozone layer is found in......  

    Solution

    The ozone layer is the common term for the high concentration of ozone that is found in the stratosphere around 15-30 Km above the earth's surface .It covers the entire planet and protect life on earth by absorbing harmful ultraviolet - B (UV-B) radiation from the sun.

  • Question 21
    1 / -0

    Electromagnetic induction is the production of an electromotive force across a conductor when it is exposed to a varying........

    Solution

    Electromagnetic induction is the production of an electromotive force across a conductor when it is exposed to a varying magnetic field.

  • Question 22
    1 / -0

    At the meter-board in the house, live wires and neutral wires pass into an electricity meter through a main fuse. Through the main switch, they are connected to the live wires in the house. These wires supply electricity to separate circuits within the house. Earth wire is used as a safety measure. Those appliances that have a metallic body, is connected to the earth wire

    In our country, the potential difference between live and neutral wires is: -

  • Question 23
    1 / -0

    At the meter-board in the house, live wires and neutral wires pass into an electricity meter through a main fuse. Through the main switch, they are connected to the live wires in the house. These wires supply electricity to separate circuits within the house. Earth wire is used as a safety measure. Those appliances that have a metallic body, is connected to the earth wire

    The insulation cover of live wire is of which colour?

  • Question 24
    1 / -0

    At the meter-board in the house, live wires and neutral wires pass into an electricity meter through a main fuse. Through the main switch, they are connected to the live wires in the house. These wires supply electricity to separate circuits within the house. Earth wire is used as a safety measure. Those appliances that have a metallic body, is connected to the earth wire

    The insulation cover of neutral wire is of which colour?

  • Question 25
    1 / -0

    At the meter-board in the house, live wires and neutral wires pass into an electricity meter through a main fuse. Through the main switch, they are connected to the live wires in the house. These wires supply electricity to separate circuits within the house. Earth wire is used as a safety measure. Those appliances that have a metallic body, is connected to the earth wire.

    The insulation cover of earth wire is of which colour?

  • Question 26
    1 / -0

    At the meter-board in the house, live wires and neutral wires pass into an electricity meter through a main fuse. Through the main switch, they are connected to the live wires in the house. These wires supply electricity to separate circuits within the house. Earth wire is used as a safety measure. Those appliances that have a metallic body, is connected to the earth wire.

    Why is the metallic body of an appliance connected to the earth wire?

  • Question 27
    1 / -0

    A device which works on the principle of the magnetic effect of current is :

    Solution

    Principle of an electric motor:

    It works on the principle of the magnetic effect of current. A current carrying coil rotates in a magnetic field. An electric motor is a rotating device that converts electrical energy to mechanical energy. 

  • Question 28
    1 / -0

    The series arrangement is not used for domestic circuits because :

    Solution

    The series arrangement is not used for domestic circuits because of the following reasons:

    \(\bullet\) When appliances are connected in series, the damage of one of the appliances can disconnect the whole circuit. It will be practically difficult to detect the defect and overloading will be an inevitable factor.

    \(\bullet\) Moreover, as the voltage is split according to the value of resistors in a series connection, the input voltage to a household will have to be too high. This high voltage supplied to any home can cause heavy damage. Hence, connecting appliances with high resistances in series is practically a dangerous application.

    \(\bullet\) Effective resistance increases, which may cause a fire.

    \(\bullet\) In series circuits, all electrical switches will have a common switch due to which they cannot be turned on/off separately.

  • Question 29
    1 / -0

    During the process of nutrition, the first step is the break-down of glucose into a pyruvate in the cytoplasm. Further, the pyruvate may be converted into ethanol and \(CO_2\) (anaerobic respiration). Breakdown of pyruvate into 3- molecules of \(CO_2\) using oxygen (aerobic respiration) releases a lot greater energy than in the anaerobic process. When there is a lack of oxygen, pyruvate is converted into lactic acid. ATP, after the energy released during cellular respiration, is synthesised and it drives the endothermic reactions taking place in the cell.

    ATP molecule is made from

  • Question 30
    1 / -0

    During the process of nutrition, the first step is the break-down of glucose into a pyruvate in the cytoplasm. Further, the pyruvate may be converted into ethanol and \(CO_2\) (anaerobic respiration). Breakdown of pyruvate into 3- molecules of \(CO_2\) using oxygen (aerobic respiration) releases a lot greater energy than in the anaerobic process. When there is a lack of oxygen, pyruvate is converted into lactic acid. ATP, after the energy released during cellular respiration, is synthesised and it drives the endothermic reactions taking place in the cell.

    Energy equivalent to ......... is released when an ATP molecule is broken

  • Question 31
    1 / -0

    During the process of nutrition, the first step is the break-down of glucose into a pyruvate in the cytoplasm. Further, the pyruvate may be converted into ethanol and \(CO_2\) (anaerobic respiration). Breakdown of pyruvate into 3- molecules of \(CO_2\) using oxygen (aerobic respiration) releases a lot greater energy than in the anaerobic process. When there is a lack of oxygen, pyruvate is converted into lactic acid. ATP, after the energy released during cellular respiration, is synthesised and it drives the endothermic reactions taking place in the cell.

    How many carbons are there in a pyruvate molecule?

  • Question 32
    1 / -0

    During the process of nutrition, the first step is the break-down of glucose into a pyruvate in the cytoplasm. Further, the pyruvate may be converted into ethanol and \(CO_2\) (anaerobic respiration). Breakdown of pyruvate into 3- molecules of \(CO_2\) using oxygen (aerobic respiration) releases a lot greater energy than in the anaerobic process. When there is a lack of oxygen, pyruvate is converted into lactic acid. ATP, after the energy released during cellular respiration, is synthesised and it drives the endothermic reactions taking place in the cell.

    An example of a micro-organism where pyruvate is converted into \(C_2H_5OH\) and \(CO_2\) during fermentation is:

  • Question 33
    1 / -0

    During the process of nutrition, the first step is the break-down of glucose into a pyruvate in the cytoplasm. Further, the pyruvate may be converted into ethanol and \(CO_2\) (anaerobic respiration). Breakdown of pyruvate into 3- molecules of \(CO_2\) using oxygen (aerobic respiration) releases a lot greater energy than in the anaerobic process. When there is a lack of oxygen, pyruvate is converted into lactic acid. ATP, after the energy released during cellular respiration, is synthesised and it drives the endothermic reactions taking place in the cell.

    Breakdown of pyruvate into \(CO_2\) using oxygen takes place in:

  • Question 34
    1 / -0

    Various roles played by decomposers in the ecosystem are :

    Solution

    Various roles played by decomposers in the ecosystem are:

    i. They decompose biodegradable substances into useful substances. Decomposers feed on dead things.

    ii. They release nutrients into soil by decomposing dead and decaying matter, thus making the soil fertile.

    iii. They maintain the nutrient pool by returning back the nutrients in the pool.

  • Question 35
    1 / -0

    Various pigments found in plants are :

    Solution

    Xanthophyll (originally phylloxanthin) is the yellow pigment found in the leaves of most plants. Carotenes can be found in many dark green and yellow leafy vegetables and appear as fat soluble pigments, while β-carotene can be found in yellow, orange and red colored fruits and vegetables. Chlorophyll is green, and is responsible for the green color of foliage and leaves. More importantly, by enabling plants to produce oxygen during photosynthesis, it is critical to sustaining our life on earth. Chlorophyll has structural features similar to heme. Bilirubin, which produces a yellow color, has recently been found in plants.

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