PYQ Vault
EbooksTutor

Day 318: JEE Mains Physics

5 questions. Try each one first, then open its answer.

  1. Question 1

    Motion in a Plane. Asked once: 14 Jun 2022 (same type asked 3 times) See all 3 of this type

    7
    A boy ties a stone of mass 100 g100\text{ }g to the end of a 2 mm long string and whirls it around in a horizontal plane. The string can withstand the maximum tension of 80 N80\text{ }N. If the maximum speed with which the stone can revolve is Kπrev\frac{K}{\pi}rev. / min⁡\min. The value of KK is : (Assume the string is massless and unstretchable)

    Tap an option to check your answer.

  2. Question 2

    Moving Charges and Magnetism. Asked once: 25 Jan 2023 (same type asked 3 times) See all 3 of this type

    102
    For a moving coil galvanometer, the deflection in the coil is 0.05rad0.05rad when a current of 10 mA10\text{ }mA is passed through it. If the torsional constant of suspension wire is 4.0×10−5 N mrad−14.0 \times10^{- 5}\text{ }N\text{ }mrad^{- 1}, the magnetic field is 0.01 T0.01\text{ }T and the number of turns in the coil is 200, the area of each turn (in cm2cm^{2} ) is :

    Tap an option to check your answer.

  3. Question 3

    Work, Energy and Power. Asked once: 2021 Paper 6 (same type asked 3 times) See all 3 of this type

    2
    A large block of wood of mass M=5.99 kgM = 5.99\text{ }kg is hanging from two long massless cords. A bullet of mass m=10 gm = 10\text{ }g is fired into the block and gets embedded in it. The (block + bullet) then swing upwards, their centre of mass rising a vertical distance h=9.8 cmh = 9.8\text{ }cm before the pendulum comes momentarily to rest at the end of its arc. The speed of the bullet just before collision is: (Take g=9.8 ms−2g = 9.8\ ms^{-2})

    Tap an option to check your answer.

  4. Question 4

    Moving Charges and Magnetism. Asked once: 6 Apr 2023 (same type asked 3 times) See all 3 of this type

    24
    Two identical circular wires of radius 20 cm20\text{ }cm and carrying current 2 A\sqrt{2}\text{ }A are placed in perpendicular planes as shown in figure. The net magnetic field at the centre of the circular wire is ___×10−8\_\_\_ \times10^{- 8}T. (Take π=3.14)\pi = 3.14)

  5. Question 5

    Alternating Current. Asked once: 29 Jul 2022 (same type asked 3 times) See all 3 of this type

    120
    A capacitor of capacitance 500μF500\mu F is charged completely using a dc supply of 100 V100\text{ }V. It is now connected to an inductor of inductance 50mH50mH to form an LC circuit. The maximum current in LC circuit will be ____\_\_\_\_ A.