SilverZone iOS Sample Paper Class 11

International Olympiad of Science - iOS’ 22 CLASS 11th SAMPLE QUESTIONS The Actual Question Paper Contains 40 Questions. The Duration of the Test Paper is 50 Minutes. 1. A body is thrown vertically up with a velocity u. It passes 5. The bond angle in PH3 is expected to be a point at a height h above the ground at time t1 while (A) 90° (B) 105° (C) 109° (D) 120° going up and at time t2 while falling down. Then the 6. Photoelectric effect supports quantum nature of light relation between u, t1 and t2 is because 2u 2u (A) there is a minimum frequency of light below which (A) t1 + t2 = (B) t2 – t1 = no photoelectron is emitted. g g (B) the maximum kinetic energy of photoelectrons u u depends on the intensity of the light. (C) t1 + t2 = (D) t2 – t1 = (C) even when the metal surface is faintly illuminated, g g the photoelectrons are emitted 2. The distance x moved by a body of mass 0.5 kg by a (D) Both A and C force varies with time t as: 7. From 6 different novels and 3 different dictionaries, 4 x = 3t2 + 4t + 5 novels and 1 dictionary are to be selected and arranged Where x is expressed in metre and t in second. What is in a row on a shelf so that the dictionary is always in the work done by the force in the first 2 seconds? the middle. The number of such arrangement is (A) 25 J (B) 50 J (A) at least 1000 (C) 75 J (D) 100 J (B) less then 500 (C) at least 500 but less than 750 3. The escape velocity of a body on the earth’s (D) at least 750 but less than 1000 surface is ve. A body is thrown with a speed 3 8. If sum of all the solutions of the equation 8 cosx ve. Assuming that the sun and planets do not  π  π  1 influence the motion of the body, its speed at  cos  6 + x  cos  6 – x  – 2  = 1 in [0, π] is kπ, then k infinity would be (A) zero (B) ve is equal to: 2 13 (C) 2 ve (D) 2 2 ve (A) (B) 3 9 4. Which of the following statements regarding Bohr 8 20 theory of hydrogen atom is not correct? (C) (D) 9 9 (A) The ionization energy of atom is equal to the energy equivalent to Rydberg constant 9. The related families are placed together in the same (B) Speed of electron in the n = 2 orbit is larger than (A) phylum (B) order that in the n = 1 orbit (C) genera (D) class (C) Radius of orbit is directly proportional to square of 10. The phloem formed from vascular cambium is known quantum number n as (D) The distance between successive orbits increases (A) primary phloem (B) protophloem with increase in the value of quantum number n. (C) secondary phloem (D) metaphloem ANSWERS 1. (A) 2. (C) 3. (D) 4. (B) 5. (C) 6. (D) 7. (A) 8. (B) 9. (B) 10. (C) 17