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AmanRaj

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  1. Asked: February 11, 2021In: Science

    Explain why a ray of light passing through the centre …

    AmanRaj

    AmanRaj

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    AmanRaj Beginner
    Added an answer on February 11, 2021 at 12:28 pm

    The light falling on the centre of curvature is reflected back along the same path because the incident ray falls on the mirror along the normal to the reflecting surface.

    The light falling on the centre of curvature is reflected back along the same path because the incident ray falls on the mirror along the normal to the reflecting surface.

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  2. Asked: February 11, 2021In: UPSC

    What is the important function of presence of ozone in …

    AmanRaj

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    AmanRaj Beginner
    Added an answer on February 11, 2021 at 12:27 pm

    Ozone is the Earth’s natural process for all life forms. It shields our planet from the UV radiations, as these ultraviolet rays are harmful for all the living things. Therefore, any change in the size of this layer will automatically affect the life of people, plants and animals living on earth. 

    Ozone is the Earth’s natural process for all life forms. It shields our planet from the UV radiations, as these ultraviolet rays are harmful for all the living things. Therefore, any change in the size of this layer will automatically affect the life of people, plants and animals living on earth. 

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  3. Asked: February 11, 2021In: Science

    Dark reaction of photosynthesis does not need light. Do plants …

    AmanRaj

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    AmanRaj Beginner
    Added an answer on February 11, 2021 at 12:26 pm

    Dark reaction does not mean that it occurs in the absence of light i.e., at night. Infact, it is the reaction occurring simultaneously with light reaction. It a chemical process occurring independent of light. This reaction is completely based on enzymes.

    Dark reaction does not mean that it occurs in the absence of light i.e., at night. Infact, it is the reaction occurring simultaneously with light reaction. It a chemical process occurring independent of light. This reaction is completely based on enzymes.

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  4. Asked: February 11, 2021In: SSC

    Why convex mirror is used in rear view mirrors and …

    AmanRaj

    AmanRaj

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    AmanRaj Beginner
    Added an answer on February 11, 2021 at 12:24 pm

    Convex mirror is commonly used in rear view mirrors in vehicles because it gives an erect, virtual, full size diminished image of distant objects with a wider field of view. Thus, convex mirrors enable the driver to view much larger area which is not possible with a concave mirror.

    Convex mirror is commonly used in rear view mirrors in vehicles because it gives an erect, virtual, full size diminished image of distant objects with a wider field of view. Thus, convex mirrors enable the driver to view much larger area which is not possible with a concave mirror.

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  5. Asked: February 11, 2021In: UPSC

    Why magnification is taken negative for real images and positive …

    AmanRaj

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    AmanRaj Beginner
    Added an answer on February 11, 2021 at 12:23 pm

    If image is real, it will be inverted which means height of image will be taken as negative. Also, the height of object is always positive. Now as magnification = Height of image / Height of object. Therefore, in case of real image, Magnification = Height of image (-) / height of object (+)=NegativeRead more

    If image is real, it will be inverted which means height of image will be taken as negative. Also, the height of object is always positive.
    Now as magnification = Height of image / Height of object.

    Therefore, in case of real image,
    Magnification = Height of image (-) / height of object (+)=Negative.
    So, Magnification will be negative.
    Similarly, if image is virtual, it will be erect.

    Therefore, in case of virtual image,
    Magnification = Height of image (+) / height of object (+)= Positive
    So, Magnification will be positive.

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  6. Asked: February 11, 2021In: Science

    Which property of carbon leads to formation of large number …

    AmanRaj

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    AmanRaj Beginner
    Added an answer on February 11, 2021 at 12:22 pm

    The two features of carbon that give rise to a large number of compounds are as follows: (i) Catenation: It is the ability to form bonds with other atoms of carbon. (ii) Tetravalency: With the valency of four, carbon is capable of bonding with four other atoms. (b) Compound Functional group (i) CH3CRead more

    The two features of carbon that give rise to a large number of compounds are as follows:

    (i) Catenation: It is the ability to form bonds with other atoms of carbon.
    (ii) Tetravalency: With the valency of four, carbon is capable of bonding with four other atoms.

    (b)

    Compound Functional group
    (i) CH3CH2CH2OH -OH = (Hydroxyl group)
    (ii) CH3COOH -COOH) (Carboxyl group)

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  7. Asked: February 11, 2021In: Science

    How are we able to see distant and nearby objects …

    AmanRaj

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    AmanRaj Beginner
    Added an answer on February 11, 2021 at 12:20 pm

    We can see distant and near objects clearly because of the property of accommodation of eye. Accommodation is the name given to the ability of the lens of the eye to change its focal length and produce focused images of both distant and near objects on the retina. Ciliary muscle helps in changing cuRead more

    We can see distant and near objects clearly because of the property of accommodation of eye. Accommodation is the name given to the ability of the lens of the eye to change its focal length and produce focused images of both distant and near objects on the retina.

    Ciliary muscle helps in changing curvature of the lens. They are attached to the lens and contract or release to change the lens shape and curvature.

    No image is formed at blind spot because there are no photoreceptors, i.e., cones and rods to detect the light and send it to brain.

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  8. Asked: February 11, 2021In: Science

    Write two precautions to be taken while identifying different parts …

    AmanRaj

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    AmanRaj Beginner
    Added an answer on February 11, 2021 at 12:19 pm

    (i) The slide should be properly focused. (ii) Slide should be observed first under low-power magnification and then under high-power magnification of the compound microscope.

    (i) The slide should be properly focused.

    (ii) Slide should be observed first under low-power magnification and then under high-power magnification of the compound microscope.

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  9. Asked: February 11, 2021In: Science

    Mention the essential material (chemicals) to prepare soap in the …

    AmanRaj

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    AmanRaj Beginner
    Added an answer on February 11, 2021 at 12:18 pm

    Raw Materials Required For preparation of soap in laboratory are : Vegetable oil Sodium Hydroxide Commom salt Test to determine the nature of reaction mixture: When a red litmus paper is dipped in the reaction mixture, the paper changes its colour to blue. Hence, the reaction mixture of the saponifiRead more

    Raw Materials Required For preparation of soap in laboratory are :

    Vegetable oil

    Sodium Hydroxide

    Commom salt

    Test to determine the nature of reaction mixture: When a red litmus paper is dipped in the reaction mixture, the paper changes its colour to blue. Hence, the reaction mixture of the saponification reaction is basic in nature.

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  10. Asked: February 11, 2021In: Science

    Mention the nature of toothpastes. How do they prevent tooth …

    AmanRaj

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    AmanRaj Beginner
    Added an answer on February 11, 2021 at 12:11 pm

    Toothpastes are basic in nature. They neutralize the acid formed in mouth which causes tooth decay.

    Toothpastes are basic in nature. They neutralize the acid formed in mouth which causes tooth decay.

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    AmanRaj added an answer The light falling on the centre of curvature is reflected… February 11, 2021 at 12:28 pm
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