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NDA I 2020 General Knowledge Test - 12
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NDA I 2020 General Knowledge Test - 12
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  • Question 1/10
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    A particle is moving with velocity , where k is a constant. The general equation for its path is

    Solutions

     

  • Question 2/10
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    The upper half of an inclined plane on inclination θ is perfectly smooth while the lower half is rough. A body starting from the rest at the top comes back to rest at the bottom if the coefficient of friction for the lower half is given by

    Solutions

    The acceleration of the body on the upper half

    For the lower half, the body comes back to rest at the bottom; it means the body retards on this section.

    The retardation of the body on the lower half, a2 =

    But the velocity of the body at the starting of this section is equal to the final velocity at the end of the smooth section

     

  • Question 3/10
    1 / -0

    A solid sphere, a hollow sphere, and a ring are released from the top of an inclined plane are released from the top of an inclined plane (frictionless) so that they slide down the plane. Then the maximum acceleration down the plane.

    Solutions

    Since the inclined plane is frictionless, there will be no rolling, and the mass will only slide down. Hence, acceleration is the same for all the given bodies.

     

  • Question 4/10
    1 / -0

    If two soap bubbles of different radii are connected by a tube,

    Solutions

    p=2σ/R

    (Where p is pressure, σ is the coefficient of the surface tension of the soap film and R is the radius of the bubble.)

    R is less for the smaller bubble, p is more . for the larger bubble, R is more so, p will be less. Since air flow from higher pressure to the lower pressure side so, it will flow from the smaller bubble to the bigger bubble.

     

  • Question 5/10
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    A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is

    Solutions

    If the block does not slide, the friction between the block and the wall should be static in nature. This friction force prevent the block from sliding on the wall

     

  • Question 6/10
    1 / -0

    Sacrificial anode protects iron of ships, underground pipelines etc. from rusting, a process known as cathosic protection. Which one of the following metals cannot be used as a sacrificial anode?

    Solutions

    Sacrificial Anodesare highly active metals that are used to prevent a less active material surface from corroding.

     

  • Question 7/10
    1 / -0

    Assertion: Trypsinogen is activated by Enterokinase into active Trypsin which in turn activates other enzymes in the Pancreatic Juice.

    Reason: The pancreatic juice contains inactive enzymes which are activated by intestinal juice.

    Solutions

    * Pancreatic juice consists of various types of inactive protein digestive enzymes such as trypsinogen, chymotrypsinogen, procarboxypeptidase and proelastase.

    * Out of these, trypsinogen is activated into trypsin due to activity of enzyme enterokinase.

    * Trypsin further results in the activation of other inactivated enzymes.

     

  • Question 8/10
    1 / -0

    The compound C7H7NO2 has

    Solutions

    C₇H₇NO₂is composed of a benzene ring with an amino group and a carboxyl group attached to the carbon atoms 1 and 4 respectively. The mass of nitrogen atoms in the molecule is twice the mass of hydrogen atoms.

     

  • Question 9/10
    1 / -0

    A body is moved along a straight line by a machine delivering a constant power. The distance moved by the body in time t is proportional to

    Solutions

     

  • Question 10/10
    1 / -0

    What is the Neutral Value of pH scale -

    Solutions

    The pH scale measures how acidic a substance is. The pH scale ranges from 0 to 14.

    Neutral value of pH scale is equal to 7.

    If the pH is less than 7, then it is Acidic.

    If pH is Greater than 7, then it is Basic.

     

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