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Q. 1 A) Solve the following questions. 05 i) If g = GM/r2 then where will the value of g be high at Goa Beach or on top of Mount Everest? ii) Identify from the following reactions the reactants that undergo oxidation and reduction? Fe + S FeS iii) Find the odd one out and justify it. Fuse wire, M.C.B., Rubber Gloves, Generator iv) Name the defect shown in the diagram.
v) Molecular formula of Propane is C3H8, write the structural formula of propane.
B) Choose and write the correct option. 05 (i) The halogen which is liquid at room temperature is .................. a) fluorine b) astetine c) bromine d) iodine
(ii) Which of the following process to be carried out to avoid the formation of greenish layer on brass vessels due to corrosion? a) plating b) anodization c) tinning d) alloying
(iii) What type of reaction is shown below?
a) Addition b) Substitution c) Decomposition d) Reduction
(iv) The temperature of ice can be decreased below 00C by mixing ............. in it. a) saw dust b) sand c) salt d) coal (v) The image obtained while finding the focal length of convex lens is .................... a) a real and erect. b) virtual and erect. c) real and inverted. d) virtual and inverted.
Q.2 Solve ANY FIVE from the following questions. 10 i) Observe the following reaction and answer the following questions. CuSO4 (aq) + Fe (s) FeSO4(aq) + Cu (s) a) Identify and write the type of chemical reaction. b) Write the definition of above reaction.
ii) Light travels with a velocity 1.5 x 108 m/s in a medium. On entering second medium its velocity becomes 0.75 x 108 m/s. What is the refractive index of the second medium with respect to the first medium?
iii) Observe the figure and answer the following questions. a) Identify the block shown by box A and write an electronic configuration of any one element of this block. b) Identify the block of element denoted by letter B and write its period number. iv) Write the IUPAC names of following hydrocarbons. a) CH3-CHOH-CH3
b) CH3-CH2-COOH
v) Why does tungsten metal used to make solenoid type coil in an electric bulb? vi) Mahendra and Virat are sitting at a distance of 1 metre from each other. Their masses are 75 kg and 80 kg respectively. What is the gravitational force between them? G = 6.67 x 10-11 Nm2/kg2