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NEET Test 189
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NEET Test 189
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  • Question 1/10
    4 / -1

    The kinetic energy of a body increases from 50 J to 150 J in 10 s. Then the power of the body is:

    Solutions

    Given,

    KE= 50J

    KE= 150J

    t = 10s

    As we know,

    The work-energy theorem states that the net work done by the forces on an object is equal to the change in its kinetic energy.

    W = ΔKE

    Where W = work done and ΔKE = change in kinetic energy

    By the work-energy theorem,

    W = ΔKE

    ∴ W = KE2 − KE1

    ⇒ W = 150 − 50

    ⇒ W = 100J

    So, the power of the body (P) = W/t

    Where = work and t = time

    ∴ P = 100/10

    ⇒ P = 10W

     

  • Question 2/10
    4 / -1

    When 3Li7 nuclei are bombarded by protons, and the resultant nuclei are 4Be8, the emitted particles will be:

    Solutions

     

  • Question 3/10
    4 / -1

    National Botanical Research Institute is situated in

    Solutions

    The National Botanical Research Institute (NBRI) is a research institute of CSIR in Lucknow. It is engaged in the field of taxonomy and modern biology.

     

  • Question 4/10
    4 / -1

    A particle of mass M at rest decays into two masses m1 and m2 with non-zero velocities. The ratio  of de Broglie wavelengths of particles is

    Solutions

    According to de Broglie's hypothesis, the momentum of the particle is inversely proportional to the wavelength of the particle. Use the law of conservation of momentum to relate the momentum of both particles using de Broglie's hypothesis.

     

  • Question 5/10
    4 / -1

    The exchange of segments of non-sister chromatids between chromosomes of a homologous pair is termed as:

    Solutions

    The exchange of segments of non-sister chromatids between chromosomes of a homologous pair is termed as crossing over.

    Translocation is the process of exchange of segments of two non-homologous pairs of chromosomes.

    Chromosomal aberration is the alteration in the chromosome number or structural changes within the chromosome.

    Transformation is the process of transfer of DNA from one bacterial cell to another.

     

  • Question 6/10
    4 / -1

    Solutions

     

  • Question 7/10
    4 / -1

    The coefficient of friction between the tyres of a car and the road is 0.25. The maximum speed with which the car can be driven around a curve of radius 40m without skidding is (assume g = 10ms−2)

    Solutions

     

  • Question 8/10
    4 / -1

    The enzyme required for removing RNA primer during DNA replication is:

    Solutions

    DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule. The DNA replication process uses DNA polymerase III to catalyze the joining of deoxyribonucleoside 5′-triphosphates (dNTPs) at a growing chain of DNA. DNA is read by DNA polymerase in the 3′ to 5′ direction, meaning the new strand is synthesized in the 5' to 3' direction.

     

  • Question 9/10
    4 / -1

    The ____ relays impulses from the CNS to skeletal muscles.

    Solutions

    The nervous system is divided into central and peripheral nervous systems. The PNS is divided into two divisions called somatic neural system and autonomic neural system. The somatic neural system relays impulses from the CNS to skeletal muscles while the autonomic neural system transmits impulses from the CNS to the involuntary organs and smooth muscles of the body.

     

  • Question 10/10
    4 / -1

    What is self-pollination?

    Solutions

    Self-pollination means fertilization by pollens of the same flower. When the pollens from the anther fall on the stigma of the same flower, the style carries the pollen to the ovaries. This is known as self-pollination.

    Self-pollination occurs when the pollen from the anther is deposited on the stigma of the same flower, or another flower on the same plant. Self-pollination occurs in flowers where the stamen and carpel mature at the same time, and are positioned so that the pollen can land on the flower's stigma.

     

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