Indian Navy Pilot JEE Main 2023 Mixed — practice questions

Explore 2 free JEE Main 2023 Mixed questions in Indian Navy Pilot Physics. Open each question or exercise to read its content, reference answers and available explanation.

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JEE Main 2023 Mixed questions and exercises with answers

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A block of mass 2 kg slides down a rough incline of 30°. Coefficient of kinetic friction is 0.2. Acceleration of block (g = 10):Read the answer and worked solution →Photon of wavelength 200 nm strikes metal with work function 2 eV. KE of fastest photoelectron (hc = 1240 eV nm):Read the answer and worked solution →

Worked practice questions

A block of mass 2 kg slides down a rough incline of 30°. Coefficient of kinetic friction is 0.2. Acceleration of block (g = 10):

3.27 m/s²
5 m/s²
1.73 m/s²
2 m/s²

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Correct answer: A. 3.27 m/s²

We have a = g(sin θ - μ cos θ). That is a = 10(0.5 - 0.2 × √3/2). That is a = 10(0.5 - 0.173). So a = 3.27 m/s².

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Photon of wavelength 200 nm strikes metal with work function 2 eV. KE of fastest photoelectron (hc = 1240 eV nm):

4.2 eV (= 6.2 - 2)
2 eV
6.2 eV
1240 eV

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Correct answer: A. 4.2 eV (= 6.2 - 2)

E_photon = 1240/200 = 6.2 eV. We have KE_max = E - W. That is KE_max = 6.2 - 2. So KE_max = 4.2 eV.