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Physics Test 76

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Physics Test 76
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Weekly Quiz Competition
  • Question 1
    4 / -1

    The capacitance of the capacitors of plate area A1 and A2 (A1 < A2) at a distance 'd' is :

    Solution

    Overlapping area is considered in the equation of parallel plate capacitor.

     

  • Question 2
    4 / -1

    The charge on 1µF capacitor and the total charge flown through battery is respectively :

    Solution

    q4µF ⇒ 24 µC
    q6µF ⇒ 6 × 4 ⇒ 24 µC
    q1µF ⇒ 4 × 1 ⇒ 4 µC
    q5µF ⇒ 4 × 5 ⇒ 20 µC
    q3µF ⇒ 3 × 10 ⇒ 30 µC
    ∴ qF ⇒ 30 + 24 ⇒ 54 µC

     

  • Question 3
    4 / -1

    Two identical capacitors 1 and 2 are connected in series to a battery as shown in figure. Capacitor 2 contains dielectric of constant K. Q1 and Q2 are charges stored on both capacitors. Now the dielectric slab is removed and the corresponding charges are Q1' and Q2'. Then :

    Solution

     

  • Question 4
    4 / -1

    A capacitor stores 60µC charge when connected across a battery. When the gap between the plates is filled with a dielectric, a charge of 120µC flows through the battery. The dielectric constant of the material inserted is :

    Solution

    qinitial ⇒ Cinitial V          ....(1)
    qfinal ⇒ Cfinal V             ....(2)

     

  • Question 5
    4 / -1

    Which of the following statements is correct for the given circuit:

    Solution

    Redistribution of charge in ckt will occur only when circuit is complete. Hence voltage will remain unchanged unless all the three switches are closed.

     

  • Question 6
    4 / -1

    Block is attached at one end of string and other end is pulling with constant speed then :

    Solution

     

  • Question 7
    4 / -1

    A system consists of three masses m1, m2 and m3 connected by a string passing over a pulley P. The mass m1 hangs freely m2 and m3 are on a rough horizontal table (the coefficient of friction = µ). The pulley is frictionless and is of negligible mass. The downward acceleration of mass m1 is :

     

    Solution

     

  • Question 8
    4 / -1

    All surfaces are smooth then aA and aB :

    Solution

     

  • Question 9
    4 / -1

    Two blocks are in contact on a frictionless table. One has mass 'm' and the other '2m'. Same force F is applied from left and right on m and 2m. In the two cases respectively, the ratio of contact force between the blocks in the two cases will be

    Solution

     

  • Question 10
    4 / -1

    Every surface is smooth, system is released from rest then :

    Solution

     

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