NSTSE Sample Paper Solutions Class 11 PCB

UNIFIED COUNCIL A n I S O 9 0 0 1 : 2008 C e r t i f i e d O r g a n i s a t i o n Test Assess Achieve NATIONAL LEVEL SCIENCE TALENT SEARCH EXAMINATION Solutions for Class : 11_PCB BIOLOGY CHEMISTRY 1. (B) Lepidoptera (scale wings) is an insect 11. (D) The favourable conditions are : order comprising butterflies and moths. (i) Low temperature, (ii) Catalyst 2. (B) Only the eusporangiate sporangia (iii) High pressure develop multicellular jacket whose inner most layer develops into tapetum. 12. (D) All the given mixtures form buffer Tapetum provides nutrition to developing solutions. In case of (II) sodium acetate spore mother cells and spores (nutritive reacts with HCl to form CH3COOH and in function) and finally abort. NaCl. 3. (D) Phagocytosis is triggered by the 13. (A) Exhaust system in limekilns drive away presence of certain particles on the cell CO 2 formed so that the equilibrium surface. shifts towards forward reaction. 4. (C) The biomacromolecules are formed from 14. (B) HCl, a strong acid, decreases the smaller molecules by a dehydration sulphide ion concentration by common ion effect. Secondly, dil. HCl is used to synthesis reaction. keep the sulphide on concentration at a 5. (D) Brown fat has a multilocular minimum level. Thus, products of their appearance. It is brown due to many respective sulphides precipitate out. mitochondria present. Brown fat is 15. (C) In option (A) No violation of any rule specially involved in heat production. In option (B) Violation of Aufbau principle The electron transport system is uncoupled from oxidative In option (C) Violation of both Aufbau phosphorylation, which results in the principle & Hund’s rule. production of heat instead of ATP. In option (D) V iolation of Aufbau principle. PHYSICS CRITICAL THINKING 6. (C) It falls with terminal velocity. (i.e., acquires a constant velocity) 16. (B) 7. (C) The pressure inside the soap bubble is 17. (A) more than that outside it. 18. (D) 8. (C) The total momentum of the ball and the earth is conserved. 19. (A) 9. (B) The inclination of the string is tan-1 (a/ 20. (D) g) opposite to the direction of motion. 10. (A) Viscous force is temperature dependent and velocity dependent. website : www.unifiedcouncil.com 1