PYQ Vault
EbooksTutor

Day 121: JEE Mains Physics

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

  1. Question 1

    Electrostatics. This type asked 2 times: 5 Apr 2024, 23 Jan 2025. This one: 23 Jan 2025 See all 2 of this type

    21
    A positive ion AA and a negative ion BB has charges 6.67×10−19C6.67 \times10^{- 19}C and 9.6×10−10C9.6 \times10^{- 10}C, and masses 19.2×10−27 kg19.2 \times10^{- 27}\text{ }kg and 9×10−27 kg9 \times10^{- 27}\text{ }kg respectively. At an instant, the ions are separated by a certain distance r. At that instant the ratio of the magnitudes of electrostatic force to gravitational force is P×1044P \times10^{44}, where the value of P is  ______\ \_\_\_\_\_\_ . (Take 14πε0=9×109Nm2C−2\frac{1}{4\pi\varepsilon_{0}}= 9 \times10^{9}Nm^{2}C^{- 2} and universal gravitational constant as 6.67×10−11Nm2 kg−26.67 \times10^{- 11}Nm^{2}{\text{ }kg}^{- 2} )

  2. Question 2

    Nuclei. This type asked 2 times: 13 Apr 2023, 23 Jan 2025. This one: 23 Jan 2025 See all 2 of this type

    89
    Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : The binding energy per nucleon is found to be practically independent of the atomic number A , for nuclei with mass numbers between 30 and 170. Reason (R): Nuclear force is long range. In the light of the above statements, choose the correct answer from the options given below :

    Tap an option to check your answer.

  3. Question 3

    System of Particles and Rotational Motion. This type asked 2 times: 2021 Paper 2, 23 Jan 2025. This one: 23 Jan 2025 See all 2 of this type

    20
    Consider a circular disc of radius 20 cm with centre located at the origin. A circular hole of a radius 5 cm is cut from this disc in such a way that the edge of the hole touches the edge of the disc. The distance of centre of mass of residual or remaining disc from the origin will be-

    Tap an option to check your answer.

  4. Question 4

    Thermal Properties of Matter. This type asked 2 times: 27 Jun 2022, 23 Jan 2025. This one: 23 Jan 2025 See all 2 of this type

    12
    A gun fires a lead bullet of temperature 300 K into a wooden block. The bullet having melting temperature of 600 K penetrates into the block and melts down. If the total heat required for the process is 625 J , then the mass of the bullet is _____\_\_\_\_\_ grams. (Latent heat of fusion of lead =2.5×104JKg−1= 2.5 \times10^{4}JKg^{- 1} and specific heat capacity of lead =125JKg−1 K−1= 125JKg^{- 1}{\text{ }K}^{- 1} )

    Tap an option to check your answer.

  5. Question 5

    Work, Energy and Power. This type asked 2 times: 14 Jun 2022, 23 Jan 2025. This one: 23 Jan 2025 See all 2 of this type

    24
    A force f=x2yi^+y2j^f =x^{2}y\widehat{i}+y^{2}\widehat{j} acts on a particle in a plane x+y=10x + y = 10. The work done by this force during a displacement from (0,0)(0,0) to (4 m,2 m)(4\text{ }m,2\text{ }m) is ______\_\_\_\_\_\_ Joule (round off to the nearest integer)