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What is pollination?
Concept: Sexual Reproduction in Plants
What is meant by a power of a lens? Define its SI unit.
Concept: Power of a Lens
Draw the well-labelled diagram of the human excretory system
Concept: Excretion
Write Joule's law of heating.
Concept: Heating Effect of Electric Current
Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants. Write one equation each for decomposition reactions where energy is supplied in the form of heat, light and electricity
Concept: Types of Chemical Reactions > Decomposition Reaction
2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube. When the contents are warmed, a gas evolves which is bubbled through a soap solution before testing. Write the equation of the chemical reaction involved and the test to detect the gas. Name the gas which will be evolved when the same metal reacts with dilute solution of a strong acid.
Concept: Chemical Equations
What is observed when a solution of sodium sulphate is added to a solution of barium chloride taken in a test tube? Write equation for the chemical reaction involved and name the type of reaction in this case.
Concept: Types of Chemical Reactions > Double Displacement Reaction
A student added few pieces of aluminium metal to two test tubes A and B containing aqueous solutions of iron sulphate and copper sulphate. In the second part of her experiment, she added iron metal to another test tubes C and D containing aqueous solutions of aluminium sulphate and copper sulphate.
In which test tube or test tubes will she observe colour change? On the basis of this experiment, state which one is the most reactive metal and why.
Concept: Physical Properties of Metals
Why are most carbon compounds poor conductors of electricity?
Concept: The Covalent Bond
Name the basic filtration unit present in the kidney.
Concept: Excretion
Name one gustatory receptor and one olfactory receptor present in human beings.
Concept: Reflex Action
Name the hormones secreted by the given endocrine glands and specify one function.
Thyroid
Concept: Hormonal Regulation in Animals
Name the hormones secreted by the given endocrine glands and specify one function.
Pituitary
Concept: Hormonal Regulation in Animals
Name the hormones secreted by the given endocrine glands and specify one function.
Pancreas
Concept: Hormonal Regulation in Animals
A student uses a lens of focal length 40 cm and another of –20 cm. Write the nature and power of each lens
Concept: Power of a Lens
A student is unable to see clearly the words written on the black board placed at a distance of approximately 3 m from him. Name the defect of vision the boy is suffering from. State the possible causes of this defect and explain the method of correcting it.
Concept: Defects of Vision and Their Corrections > Myopia
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
Concept: Electrical Power
Show how would you join three resistors, each of resistance 9 Ω so that the equivalent resistance of the combination is
1) 13.5
2) 6 Ω
Concept: Resistance of a System of Resistors >> Resistors in Parallel
List the factors on which the resistance of a conductor in the shape of a wire depends.
Concept: Factors of Resistance
