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JEE Main 2020 Question Paper & Answers

The official JEE Main 2020 question paper, with the official answer key. Attempt as a real timed exam (with negative marking) or switch to practice mode for instant per-question answers and explanations.

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Official PYQ

JEE Main 2020 - September 4 Shift 1

180 Mins 300 Marks
75Questions
300Max Marks

Sample questions from JEE Main 2020 - September 4 Shift 1

1Starting from the origin at time t=0t=0, with initial velocity 5j^5\hat j ms−1^{-1}, a particle moves in the x-y plane with a constant acceleration of (10i^+4j^)(10\hat i+4\hat j) ms−2^{-2}. At time tt, its coordinates are (20 m,yt m)(20\text{ m}, y_t\text{ m}). The values of tt and yty_t are, respectively:
  • A) 5 s and 25 m
  • B) 2 s and 18 m
  • C) 2 s and 24 m
  • D) 4 s and 52 m
Answer: B
2A small bar magnet placed with its axis at 30° with an external field of 0.06 T experiences a torque of 0.018 Nm. The minimum work required to rotate it from its stable to unstable equilibrium position is:
  • A) 7.2×10−37.2\times10^{-3} J
  • B) 6.4×10−36.4\times10^{-3} J
  • C) 9.2×10−39.2\times10^{-3} J
  • D) 11.7×10−311.7\times10^{-3} J
Answer: C
3Choose the correct option relating wavelengths of different parts of the electromagnetic wave spectrum:
  • A) λradio>λmicrowave>λvisible>λX−ray\lambda_{radio}>\lambda_{microwave}>\lambda_{visible}>\lambda_{X-ray}
  • B) λX−ray>λgamma>λradio>λmicrowave\lambda_{X-ray}>\lambda_{gamma}>\lambda_{radio}>\lambda_{microwave}
  • C) λvisible<λmicrowave<λradio\lambda_{visible}<\lambda_{microwave}<\lambda_{radio}
  • D) λradio<λmicrowave<λX−ray\lambda_{radio}<\lambda_{microwave}<\lambda_{X-ray}
Answer: A
4On the x-axis and at a distance x from the origin, the gravitational field due to a mass distribution is given by Ax(x2+a2)3/2\dfrac{Ax}{(x^2+a^2)^{3/2}} in the x-direction. The magnitude of the gravitational potential on the x-axis at distance x, taking its value to be zero at infinity, is:
  • A) Ax2+a2\dfrac{A}{\sqrt{x^2+a^2}}
  • B) A(x2+a2)A(x^2+a^2)
  • C) A(x2+a2)3/2\dfrac{A}{(x^2+a^2)^{3/2}}
  • D) A(x2+a2)3/2A(x^2+a^2)^{3/2}
Answer: A
5A small bar magnet is moved through a coil at constant speed from one end to the other. Which series of galvanometer deflections (entry, fully inside, exit) will be observed?
  • A) Deflection one way, then zero, then deflection the other way
  • B) Deflection one way throughout, increasing then decreasing
  • C) Zero throughout
  • D) Deflection the same way at entry and exit, zero in between
Answer: A

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