DPP

DPP – 9S81 FIRST LAW OF MOTION, INERTIA & SECOND LAW OF MOTION 1. State the law of Inertia, Explain the type of Inertia. 2. A constant force acts on an object of mass 5 kg for a duration of 2 s. It increases the object’s velocity from 3 m s–1 to 7 m s-1. Find […]

DPP – 9S72 MOTION     1. Starting from a stationary position, Rahul paddles his bicycle to attain a velocity of 6 m s–1 in 30 s. Then he applies brakes such that the velocity of the bicycle comes down to 4 m s-1 in the next 5 s. Calculate the acceleration of the bicycle in both

DPP – 10S92 REFRACTION & REFRACTIVE INDEX   Q1. A object is placed at a distance of 60 cm from a concave lens of focal length 30 cm (i) Find the distance of the image from the lens. (ii) List four characteristics of the image ( nature, position, size, erect/inverted ) formed (iii) Draw ray

DPP – 11B21 BIOLOGICAL CLASSIFICATION       Q1. Define experimental taxonomy?   Q2. What are red tides? Why are they caused & why are they harmful?   Q3. Viruses and viroids differ in structure and disease they cause. How?   Q4. Give one example of fungus as a source of antibiotics?   Q5. Explain

DPP – 9S21 IS MATTER AROUND US PURE?   Q1. Difference between pure and impure, element and compound, compound and mixture?   Q2. Which of the following materials fall into the category of “pure substance”?   (a) Ice (b) Milk (c) Iron (d) Hydrochloric acid (e) Calcium oxide (f) Mercury (g) Brick (e) Wood (f)

DPP – 11C26 De Broglie & Heisenberg Uncertainty Principle     Q1. Calculate the mass of photon with λ = 3.6 Å. (Ans : m = 6.1 × 10-29 𝐾𝑔 )   Q2. Calculate wavelength if kinetic energy is 3.0 × 10-25𝐽. ( Ans : 𝜆 = 8967 × 10-9 𝑚 )   Q3. Two particle A &

DPP – 11C25 Bohr’s Model   Q1. Calculate energy of electron in 2nd orbit of He+ also calculate the radius. (Ans: 𝐸2  = –2.18 × 10−18 J/atom, 𝑟2 = 105.8 pm)   Q2. Calculate the energy required to remove an electron from 2nd orbit to 4m orbit also calculate the wavelength associated with it. (Ans: △E =

  DPP – 11C24 Hydrogen Spectrum     Q1. Calculate the wavelength of light emitted in Hydrogen atom if electron undergoes transition from 2nd to 4th orbit. (Ans: 486 × 10−7 cm)   Q2. What transition in the Hydrogen Spectrum would have the same wavelength as the Balmer Series in the 𝐻𝑒+ is the electron comes form

DPP – 11C22 Planks Quantum Theory & Electromagnetic Wave Theory     Q1. 100 watt monochromatic light λ = 400 nm. Calculate number of photons emitted per second by bulb. (Ans: 2012 × 1017 per second)   Q2. If time period is 2 × 10–10 sec. Calculate λ, Frequency, wave number.  (Ans: ν = 5 × 109

DPP – 11C23 PHOTOELECTRIC EFFECT     Q1. If Threshold frequency is 7 × 10 14 𝑠𝑒𝑐 -1. Calculate the kinetic energy if frequency of the radiation is 1 × 1015 𝑠𝑒𝑐-1 . (Ans – 19.8 × 10−20 J )   Q2. Electrons are emitted with zero velocity from a metal surface when it is exposed to radiation of λ