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  1. Asked: September 29, 2022In: Physics

    If magnetic force does not work on charged particles, how can it have any effect on particle motion?

    Anish LEVEL 1
    Added an answer on September 29, 2022 at 8:37 pm

    When a charged particle moves on uniform magnetic field (B), it experience a force F as F= Bqv sinΘ, where q is charge particle, v be its velocity and Θ be is angle between B and v. This force is acting toward the motion of the circle or motion is circular. The direction of force F and distance coveRead more

    When a charged particle moves on uniform magnetic field (B), it experience a force F as F= Bqv sinΘ, where q is charge particle, v be its velocity and Θ be is angle between B and v. This force is acting toward the motion of the circle or motion is circular. The direction of force F and distance covered s are always perpendicular to each other such that, work done W = FS cos90 = 0. so, the magnetic force does no work done but moves the particle in circular motion.

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  2. Asked: April 13, 2022

    An earthworm is hermaphrodite but self fertilization does not takes place ,why?

    knowithere LEVEL 21
    Added an answer on April 13, 2022 at 6:07 pm

    an earthworm is hermophodite but there is no self fertilization because of proandus ( male gamete and female gamete ).

    an earthworm is hermophodite but there is no self fertilization because of proandus ( male gamete and female gamete ).

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  3. Asked: November 2, 2021In: Biology MCQs

    Animals are classified into hierarchical groups, in which one of the following, the target number of species is found?

    knowithere LEVEL 21
    Added an answer on February 5, 2022 at 6:57 pm

    Option A is the correct answer

    Option A is the correct answer

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  4. Asked: November 2, 2021In: Biology MCQs

    Hierarchy of categories of Carolus Linnaeus had categories except

    Heman LEVEL 16
    Added an answer on November 19, 2021 at 7:34 pm

    Option D is the correct answer !!! Linnaeus proposed that there were three broad groups, called kingdoms. These kingdoms were animals, plants, and minerals. He divided each of these kingdoms into classes. Classes were divided into orders. These were further divided into genera (genus is singular) anRead more

    Option D is the correct answer !!!
    Linnaeus proposed that there were three broad groups, called kingdoms. These kingdoms were animals, plants, and minerals. He divided each of these kingdoms into classes. Classes were divided into orders. These were further divided into genera (genus is singular) and then species.

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  5. Asked: November 2, 2021In: Biology MCQs

    The descending arrangement of categories is known as

    Heman LEVEL 16
    Added an answer on November 19, 2021 at 7:32 pm

    Option C is the correct answer !!! Hierarcy is the process of arranging taxonomic categories in descending order where species is lowest and kingdom is at top.

    Option C is the correct answer !!!
    Hierarcy is the process of arranging taxonomic categories in descending order where species is lowest and kingdom is at top.

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  6. Asked: November 2, 2021In: Biology MCQs

    What of the following is true about the species which have became extinct?

    Heman LEVEL 16
    Added an answer on November 19, 2021 at 7:27 pm

    Option A is the correct answer !!!

    Option A is the correct answer !!!

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  7. Asked: November 2, 2021In: Biology MCQs

    A homonym is 

    Heman LEVEL 16
    Added an answer on November 19, 2021 at 7:26 pm

    Option C is the correct answer !!! identical name of two different taxa is Homonym.

    Option C is the correct answer !!!
    identical name of two different taxa is Homonym.

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  8. Asked: November 2, 2021In: Biology MCQs

    Identify from the following the only category that has a real existence.

    Heman LEVEL 16
    Added an answer on November 19, 2021 at 7:23 pm

    Option D is the correct answer !!! A species is defined as the largest group of organisms sharing similar characteristics, capable of interbreeding and produce fertile offspring.

    Option D is the correct answer !!!
    A species is defined as the largest group of organisms sharing similar characteristics, capable of interbreeding and produce fertile offspring.

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  9. Asked: November 2, 2021In: Biology MCQs

    Which is different in different groups?

    Heman LEVEL 16
    Added an answer on November 19, 2021 at 7:21 pm

    Option B is the correct answer !!! A taxon is the category of a group of organisms that forms a unit. Different groups have different taxon.

    Option B is the correct answer !!!

    A taxon is the category of a group of organisms that forms a unit. Different groups have different taxon.

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  10. Asked: November 2, 2021In: Biology MCQs

    Select the incorrect statements:(a) Lower the taxon, more are the characteristics shared by members.(b) Order is an assemblage of genera which have a few similar characters.(c) Cat and dog belong to same family of felidae.(d) Binomial nomenclature was introduced by Carolus Linnaeus.

    Heman LEVEL 16
    Added an answer on November 19, 2021 at 7:19 pm

    Option A is the correct answer !!!

    Option A is the correct answer !!!

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