M Dash Foundation: C Cube Learning

Category: Thoughts on Science

  • A Question a Day (series) Q2

    1. A ball is thrown with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the instantaneous vertical velocity of the ball when it is 5.1 m above the release point? (g = 9.8 m/s^2) A. 0.2 m/s B. 6.6 m/s C. 10 m/s D. 17 m/s

  • A question a day !! (series) Q1

    1. Which of the following best describes the most widely accepted theory of the solar system’s evolution? A. A small star grew as it consumed comets, eventually becoming large enough to ignite fusion reactions and attract planetary bodies.

  • Physics Class Test, XII {PU/ISc/ICSE/CBSE}

    A. What’s the speed of an electron in a cathode ray tube if the electric field and magnetic field are of unit strength in SI unit? Calculate magnetic force experienced by the electron. 4 marks B. Derive the formula for magnetic field produced by an infinitely long straight conductor. 4 marks

  • Physics Midterm for ISc-II (ICSE) [also good for CBSE/PU-II]

    (c) Fission of U – 235 nucleus releases 200 MeV of energy. Calculate the fission rate (i.e. no. of fissions per second) in order to produce a power of 320 MW. Q 10: (a) What’s the ratio of the shortest wavelength of Balmer series to the shortest wavelength of the Lyman series? (b) What are…

  • Physics class tests, XII/ICSE/CBSE

    3. Why Ka and Kb lines are produced (chose only one appropriate answer) A. electronic transitions B. Atomic collisions C. Radioactive decay D. Nuclear transmutation 4. Exactly why there is quantization of physical variables such as momentum, angular momentum, energy, orbital distance and speed? A. wave-particle duality B. Interference of waves C. Particle acceleration to…