(ii) All questions are compulsory.
(iii) There is no choice in any of the questions.
(iv) All questions of Section−A and all questions of Section−B are to be attempted separately.
(v) Question numbers 1 to 3 in Section−A are one mark questions. These are to be answered in one word or one sentence.
(vi) Question numbers 4 to 6 Section−A are two marks questions. These are to be answered in about 30 words each.
(vii) Question numbers 7 to 18 in Section−A are three marks questions. There are to be answered in about 50 words each.
(viii) Question numbers 19 to 24 in Section−A are five marks questions. These are to be answered in about 70 words each.
(ix) Question numbers 25 to 33 in Section−B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you
(x) Question numbers 34 to 36 in Section B are two marks questions based on practical skills. These are to be answered in brief.
- Q1VIEW SOLUTION
- Q2VIEW SOLUTION
- Q3VIEW SOLUTION
- Q4VIEW SOLUTION
- Q5VIEW SOLUTION
- Q6VIEW SOLUTION
Write the name and structural formula of the compound formed when ethanol is heated at 443 K temperature with excess of conc. H2SO4. What is the role of conc. H2SO4 in this reaction? Also give the chemical equation for the reaction.VIEW SOLUTION
- Q8VIEW SOLUTION
Four elements P, Q, R and S belong to the third period of the Modern Periodic Table and have respectively 1, 3, 5 and 7 electrons in their outermost shells. Write the electronic configurations of Q and R and determine their valences. Write the molecular formula of the compound formed when P and S combine.VIEW SOLUTION
In the following table, the positions of six elements A, B, C, D, E and F are given as they are in the Modern Periodic Table :VIEW SOLUTION
On the basis of the above table, answer the following questions :
(i) Name the element which forms only covalent compounds.
(ii) Name the element which is a metal with valency three.
(iii) Name the element which is a non-metal with valency three.
(iv) Out of B and C, whose atomic radius is bigger and why ?
(v) Write the common name for the family to which the elements D and F belong.
- Q11VIEW SOLUTION
- Q12VIEW SOLUTION
- Q13VIEW SOLUTION
- Q14VIEW SOLUTION
- Q15VIEW SOLUTION
A student wants to project the image of a candle flame on a screen 80 cm in front of a mirror by keeping the candle flame at a distance of 20 cm from its pole.(i) Which type of mirror should the student use?
(ii) Find the magnification of the image produced.(iii) Find the distance between the object and its image.
(iv) Draw a ray diagram to show the image formation in this case and mark the distance between the object and its image.VIEW SOLUTION
- Q17VIEW SOLUTION
- Q18VIEW SOLUTION
- Q19VIEW SOLUTION
(a) Identify A, B, C and D in the given diagram and write their names.VIEW SOLUTION
(b) What is pollination ? Explain its significance.
(c) Explain the process of fertilisation in flowers. Name the parts of the flower that develop after fertilisation into
What is meant by the power of a lens ? What is its S.I. unit ? Name the type of lens whose power is positive.VIEW SOLUTION
The image of an object formed by a lens is real, inverted and of the same size as the object. If the image is at a distance of 40 cm from the lens, what is the nature and power of the lens ? Draw ray diagram to justify your answer.
A student has focused the image of a candle flame on a white screen using a concave mirror. The situation is as given below :
Length of the flame = 1.5 cmFocal length of the mirror = 12 cm
Distance of flame from the mirror = 18 cm
If the flame is perpendicular to the principal axis of the mirror, then calculate the following :
(a) Distance of the image from the mirror
(b) Length of the image
If the distance between the mirror and the flame is reduced to 10 cm, then what would be observed on the screen? Draw ray diagram to justify your answer for this situation.
State the function of each of the following parts of the human eye:
Millions of people of the developing countries are suffering from corneal blindness. This disease can be cured by replacing the defective cornea with the cornea of a donated eye. Your school has organised a campaign in the school and its neighbourhood in order to create awareness about this fact and motivate people to donate their eyes after death. How can you along with your classmates contribute in this noble cause? State the objectives of organising such campaigns in schools.VIEW SOLUTION
Elements forming ionic compounds attain noble gas electronic configuration by either gaining or losing electrons from their valence shells. Explain giving reason why carbon cannot attain such a configuration in this manner to form its compounds. Name the type of bonds formed in ionic compounds and in the compounds formed by carbon. Also explain the reason why carbon compounds are generally poor conductors of electricity.VIEW SOLUTION
A student obtained on a screen the sharp image of a candle flame placed at the farther end of laboratory table using a concave mirror. For getting better value of focal length of the mirror, the teacher suggested to him to focus the sun. What should the student do?VIEW SOLUTION
(A) Should move the mirror away from the screen.
(B) Should move the mirror towards the screen.
(C) Should move the mirror and screen both towards the sun.
(D) Should move only the screen towards the sun.
While determining the focal length of a convex lens, you try to focus the image of a distant object formed by the lens on the screen. The image formed on the screen, as compared to the object, should beVIEW SOLUTION
(A) erect and highly diminished
(B) erect and enlarged
(C) inverted and enlarged
(D) inverted and highly diminished
- Q27VIEW SOLUTION
- Q28VIEW SOLUTION
A student takes 4 mL of distilled water in each of four test tubes I, II, III and IV, and then dissolves an equal amount of four different salts namely NaCl in I, CaCl2 in II, MgCl2 in III and KCl in IV. He then adds 8 drops of the given soap solution to each test tube and shakes the contents of the test tube 10 times. In which test tubes will enough lather (foam) be formed ?VIEW SOLUTION
(A) I and II
(B) II and III
(C) I and IV
(D) III and IV
A student puts a drop of acetic acid first on a blue litmus paper and then on a red litmus paper. He would observe thatVIEW SOLUTION
(A) the red litmus paper turns colourless and there is no change in the blue litmus paper.
(B) the red litmus paper turns blue and the blue litmus paper turns red.
(C) there is no change in the red litmus paper and the blue litmus paper turns red.
(D) there is no change in the blue litmus paper and the red litmus paper turns blue.
While studying saponification reactions, the following comments were noted down by the students :VIEW SOLUTION
(I) Soap is a salt of fatty acids.
(II) The reaction mixture is basic in nature.
(III) In this reaction heat is absorbed.
(IV) This reaction is not a neutralisation reaction.
Which of these are the correct comments ?
(A) I and III only
(B) I, II and III
(C) II, III and IV
(D) I and II only
In a class, students were asked to observe the models/slides/pictures of the skeletons of forelimbs and wings of different organisms. After the observations the students made the following groups of homologous structures. Select the correct group :VIEW SOLUTION
(A) Wings of a bird and a butterfly
(B) Wings of a pigeon and a bat
(C) Wings of a butterfly and a bat
(D) Forelimbs of a cow, a duck and a lizard
A student is asked to study the different parts of an embryo of pea seeds. Given below are the essential steps for the experiment :VIEW SOLUTION
(I) Soak the pea seeds in plain water and keep them overnight.
(II) Cut open the soaked seed and observe its different parts.
(III) Take some pea seeds in a petri dish.
(IV) Drain the excess water. Cover the seeds with a wet cotton cloth and leave them as it is for a day.
The correct sequence of these steps is
(A) III, I, IV, II
(B) III, IV, I, II
(C) III, I, II, IV
(D) III, II, I, IV
A student places a 8.0 cm tall object perpendicular to the principal axis of a convex lens of focal length 20 cm. The distance of the object from the lens is 30 cm. He obtains a sharp image of the object on a screen placed on the other side of the lens. What will be the nature (inverted, erect, magnified, diminished) of the image he obtains on a screen? Draw ray diagram to justify your answer.VIEW SOLUTION
A student is studying the properties of acetic acid. List two physical properties of acetic acid he observes. What happens when he adds a pinch of sodium hydrogen carbonate to this acid? Write any two observations.VIEW SOLUTION
- Q36VIEW SOLUTION
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