Q.1. An element A has valency 2. Write the formulae of its hydroxide and nitride. orAn element X has valency 1. Write the chemical formulae of its chloride & oxide.Q.2.J. Chadwick discovered a subatomic particle which has no charge and has mass nearly equal that of a proton. Name the particle and give its location in the atom.Q.3.Which of the following statements are correct for pure substances?(i)Pure substances contain only one kind of particles.(ii)Pure substances have the same composition throughout.(iii)Pure substances can be exemplified by all elements other than copper.(a) i & ii(b) i & iii(c) iii & iv(d) ii & iiiQ.4. Can a constant velocity be maintained in a body moving on a rough surface without doing any work on it?Justify your answer.Q.5.When a branch of a tree is shaken, some of the fruits may fall down. Why?Q.6.The two ends of a spring-balance are pulled each by a force of 10 kg-wt. What will be the reading of the balance?Q.7.Name the physical quantity which remains conserved during collision between two or more isolated bodies.
2Q.8.A truck and a car moving with the same kinetic energy are brought to rest by the application of brakes which provide equal retarding forces. Which body willmovemore distance before coming to rest.orDo action-reaction forces produce the same magnitude of acceleration?Q.9.State and define the SI unit of power.Q.10.What type of plastid is more common ina) flowers and fruitsb)roots of plantsQ.11.Name the type of cell division in which chromosome number is reduced to half. What is the significance of this step?
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add Zimmermann subsidiary d
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