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NEET Test 99

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NEET Test 99
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Weekly Quiz Competition
  • Question 1
    4 / -1

    A resonance air column of length 40 cm resonates with a tuning fork of frequency 450 Hz. Ignoring end corrections, the velocity of sound in air will be:

    Solution

    We know that the minimum length of the air column tube corresponds to the fundamental mode of vibrations. Hence, by ignoring end corrections-

    Length of column = 40 cm

    =0.4 m

    Frequency of tuning fork =450 m 

    Using the formula, n= v/4I

    V= 450 ×4 × 0.4

    =720 m/s

    Hence,the correct option is (D).

     

  • Question 2
    4 / -1

    Opening or blooming of the flower is known as:

    Solution

    Anthesis refers to the process of opening of the floral buds. It involves dehiscence of the anthers, attracting the pollinators, stigma receptivity, style elongation etc. Also, anthesis can be a sequential process in the inflorescence. The flower during anthesis becomes functional.

    Hence, the correct option is (A).

     

  • Question 3
    4 / -1

    The first law of motion is also known as the law of

    Solution

    Newton's first law of motion is also known as the law of inertia. Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion.

    Hence, the correct option is (A).

     

  • Question 4
    4 / -1

    A ray of light passes through four transparent media with refractive indices μ1,μ2,μ3, and μ4 as shown in the figure below. The surfaces of all media are parallel. If the emergent ray CD is parallel to the incident ray AB, we must have:

    Solution

     

  • Question 5
    4 / -1

    Which of the following options is false regarding metamerism in animals?

    Solution

    The segmentation of the pharyngeal endoderm has also been key to the evolution of pharyngeal metamerism. It is likely that endodermal segmentation is a deuterostome characteristic and that this basic pattern was sequentially modified and over time the more complex pharyngeal metamere of vertebrates emerged.

    Hence, the correct option is (C).

     

  • Question 6
    4 / -1

    In the evolution of man, several changes occurred in the ancestral characters. Which one of the following changes is irrelevant in this context?

    Solution

    Arboreal mode of lifestyle: who spend the majority of their lives in trees. They eat, sleep and play in the tree canopy.

    Over the years we have started linig in the houses made by man. we don't lead arboreal lifestyle any more.

    Hence, the correct option is (C).

     

  • Question 7
    4 / -1

    People have problems walking straight and driving when they have too many alcoholic drinks. In this condition, which part of their brain is affected?

    Solution

    The cerebellum (which is Latin for “little brain”) is a major structure of the hindbrain that is located near the brainstem. This part of the brain is responsible for coordinating voluntary movements.

    Coordination of voluntary movements: Most movements are composed of a number of different muscle groups acting together in a temporally coordinated fashion. One major function of the cerebellum is to coordinate the timing and force of these different muscle groups to produce fluid limb or body movements. Therefore, people drinking alcohol heavily have problems walking straight and driving.

    Hence, the correct option is (B).

     

  • Question 8
    4 / -1

    A proton, a deuteron, and an α -particle is projected perpendicular to the direction of a uniform magnetic field with the same kinetic energies. The ratio of the radii of the circular paths described by them is -

    Solution

    According to the question, the magnetic field is uniform and the kinetic energy for each particle is the same.

    We know that,

     

  • Question 9
    4 / -1

    Two circular coils 1 and 2 are made from the same wire, but the radius of the 1st coil is twice that of the 2nd coil. What is the ratio of potential differences applied across them, so that the magnetic field at their centres is the same?

    Solution

    Magnetic field due to the first coil and the second coil is same at the centre.

    Then magnetic field B at centre is,

     

  • Question 10
    4 / -1

    Which of the following algae contains mannitol as reserve food material?

    Solution

    Ectocarpus contains mannitol as reserve food material.

    Ectocarpus is a brown alga belongs to the class Phaeophyceae. Members of this class have mannitol and laminarin as stored food material. Ulothrix and Volvox belong to Chlorophyceae (green algae). Members of this class have starch as reserve food material. Gracilaria is a member of red algae (Rhodophyceae). This class is characterised by having floridean starch as stored food material.

    Hence, the correct option is (B).

     

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