1 Marks Questions:-
1) A Mendelian experiment consisted of breeding pea plantsbeing violet flowers with pea plants bearing white plants. What will be the result in F1 progeny?
2) Write the energy conservation that takes place in a hydropower plant.
3) A compound ‘X’ on heating excess of conc. sulphuric acid at 443 K gives an unsaturated compound ‘Y’. ‘X’ also reacts with sodium metal to evolve a colourless gas ‘Z’. Identify ‘X’, ‘Y’, & ‘Z’. Write the equation of the chemical reaction of formation of ‘Y’ and also write the role of sulphuric acid in the reaction.
4) (i) Name one gustatory receptor and olfactory receptor present in human beings.
(ii) Write a and b in the given flowchart of neuron through which information traveles as an electrical impulses.
DENDRITES —–>A —–> B —–> END POINT OF NEURON
5) If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished, what type of mirror is it? Draw a labelled ray diagram to support your answer.
6) 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 energy.
7) 2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a testbtube. 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 evolves when the same metal reacts with dilute solution of a strong acid.
8) The pH of a salt used to make tasty and crispy pakoras is 14. Identify the salt and wriy a chemical equation for its formation. List it’s two uses.
9) (a) Why are most carbon compounds poor conductors of electricity?
(b) Write the name and structure of a saturated compound in which the carbon atoms are arranged in a ring. Give the number of single bond present in this compound.
10) Name the hormones secreted by the following endocrine glands and specify one function for each:-
(a) Thyroid (b) Pituitary (c) Pancreas
11) Write one main difference between asexual and sexual mode of reproduction. Which species likely to have comparatively better chances of survival – the one who reproducing asexually or the one reproducing sexually? Give reason to justify your answer.
12) Show how would you join three resistors, each of resistance 9 ohms so that the equivalent resistance of combination is
i) 13.5 ohms, ii) 6 ohms ?
13)(i) Write Joule’s law of heating.
(ii) Two lamps, one rated 100 W; 220 V and the other 60 W; 220 V, are connected in parallel to electric mains supply. Find the current drawn by two bulbs from the line, if the supply voltage is 220 V.
14) (i) List the factors on which the resistance a conductor in the shape of a wire depends.
(ii) Why are metals good conductor of electricity whereas glass is a bad conductor of electricity? Give reason.
(iii) Why are alloys commonly used in electrical heating devices? Give reason.
15) Students in a school listened to the news read in the morning assembly that the mountain of garbage in Delhi, suddenly exploded and various vehicles got buried under it. Several people were also injured and there was a traffic jam all around. In the brain storming session the teacher also discussed this issue and asked the students to find out a solution to the problem of garbage. Finally they arrived at two main points- one is self management of the garbage we produce and the second is to generate less garbage at individual level.
(i) Suggest two measures to manage garbage we produce.
(ii) As an individual, what can we do to generate the least garbage? Give two points.
(iii) List two values the teacher instilled in his students in this episode.
16) What is a dam? Why do we seek to build large dams? While building large dams, which three main problems should particularly be addressed to maintain peace among local people? Mention them.
Apex Class 
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