Science and Technology Class X - 2009 Note: All questions are compulsory Each question carries marks mentioned against them. Time 2.30 Hours Max Marks 60 Section A Q 1 Write the relation between 1 watt, 1 volt and 1 ampere ? 1 Ans 1 Watt = 1 Volt X 1 Amphere Q2 In the electrolytic refining of an impure metal which substance is used to make the anode? 1 Ans Copper Q 3 What type of mirror is used to obtain a real image? 1 Ans Concave mirror. Q4 Write down chemical formula of Baking power and Baking soda? 1 Ans Baking power =NaHCO 3 + NaAl(SO 4 ) 2