CLASS X SCIENCE DPP 1
CLASS X - SCIENCE
✤ General Instruction
(1) This question paper consists of 39 questions in 3 sections. Section A is Biology;
Section B is Chemistry and Section C is Physics.
(ii) All questions are compulsory. However, an Internal choice is provided in some
questions. A student is expected to attempt only one of these questions.
(iii) Q8, Q9, Q24 and Q32 are Assertion-Reason based questions. The questions
consist of two statements-Assertion (A) and Reason (R). Answer these questions
by selecting the appropriate option given below:
Option A - Both A and R are true, and R is the correct explanation of A.
Option B - Both A and R are true, and R is not the correct explanation of A.
Option C - A is true but R is false.
Option D - A is false but R is true.
SECTION-A (BIOLOGY)
1. During vigorous exercise, the occurrence of cramps in muscles is due
to the conversion of pyruvate to:
(a) Ethanol (b) Glucose
(c) Lactic acid (d) Carbon dioxide
2. Two of the following four figures that illustrate budding are
(a) I and II (b) I and IV
(c) II and IV (d) I and III
3. Match the following with the correct response.
Column A Column B
(i) The master gland (A) Control cell division and cell growth
(ii) Cytokinin (B) Regulates metabolism
(iii) Insulin (C) Reduces blood sugar
(iv) Thyroxine (D) Pituitary gland
(a) (i)-(D), (ii)-(A), (iii) -(C), (iv) - (B)
(b) (i)-(C), (ii)(B), (iii) (D), (iv)-(A)
(c) (1)-(A), (ii) (C), (il) - (B), (iv) - (D)
(d) (1)-(B), (ii) (D), (il)-(A), (iv)-(C)
4. In a reflex arc, the sensory nerve carries messages from receptor cells to the:
(a) Brain (b) Muscles of effector organ
(c) Spinal cord (d) Bones
5. The gene combination of parrental pea plants producing 50% tall and
50% short plants in Ft generation will be:
(a) TtxTt (b) TTx Tt
(c) Ttxtt (d) TT xtt
6. The % of solar energy which is not converted in to food energy by the
green plants in any terrestrial ecosystem is about
(a) 1% (b) 10% (c) 90% (d) 99%
7. Which part of the following is a site of implantation?
(a)D (b) A (c)C (d)S
8. Assertion (A): Amoeba takers in food using finger-like extensions of
the cell surface.
Reason (R): in all unicellular organisms, the food is taken in by the
entire cell.
9. Assertion (A): Genes inherited from the parents decide the sex of a
child.
Reason (R): The X chromosome in a male child is inherited from his
father.
10. (a) Name and differentiate between the two modes of pollination in
flowering plants.
(b) In the given picture, what would be your observation in the covered
and uncovered regions of the selected leaf after performing the
lodine test?
11. Attempt either option A or B
A. Trace the direction of flow of energy in a food chain consisting of grass, deer, tiger. Why is this flow unidirectional?
OR
B. Study the energy flow diagram carefully and answer the
following questions:
(a) How much energy (in units) will pass from goat to tiger?
(b) Which law operates during the transfer of energy from
grass to goat to tiger?
12. State the parts of CNS or hormones which controls the following: -
(a) Vomiting (b) Walking in a straight line
(c) Phototropism (d) Regulation of metabolism in human body
13. Attempt either option A or B
(A) (i) Name the artery that brings oxygenated blood to the kidney.
(ii) Name the cluster the thin-walled blood capillaries present in the
Bowman's () capsule.
(iii) List two major steps involved in the formation of urine and state
in brief their functions.
OR
B. (i) How do harmful chemicals get accumulated progressively at each
trophic level in a food chain?
(ii) How is the movement of leaves of the sensitive plant different from
the movement of a shoot towards light?
14. (a) Explain the post fertilization changes that occur in the ovules and
ovary of a flower.
(b) Given below is a diagram of a germinating seed.
Label the parts that
i. gives rise to future shoots.
ii. gives rise to the future root system.
iii. stores food.
15. Case Study (internal choice in sub-part c)
Read the passage carefully and answer the following questions.
A student performed an experiment to study the inheritance of two
traits - seed shape and seed colour - in pea plants. He crossed round
yellow seeds with wrinkled green seeds. The F₁ generation showed
only round yellow seeds. When these were self- pollinated, the F₂
generation showed four combinations: round yellow, round green,
wrinkled yellow, and wrinkled green seeds.
(a) Which traits are dominant?
(b) What will be the phenotypic ratio in the F₂ generation?
(c) Which law of inheritance is demonstrated in this experiment?
Define that law.
OR
(c) Name and draw the cross to show the above experiment till F1
generation only.
16. Attempt either option A or B.
A. (a) Define the process which takes place if the egg is not fertilized by
sperm.
(b) Mention one function each of the following organs in human
reproductive system
I. Testis II. Oviduct III. Prostate gland IV. Placenta
(c) List two methods of contraception and explain one example from
each category.
OR
B. (a) Sate one important function of the ozone layer at the
atmosphere
(b) How is ozone formed?
(c) It has been observed that the ozone layer is getting depleted.
Name the compound responsible for its depletion.
(d) During respiration in a organism A, one molecule of glucose
produces 2 ATP molecules whereas in respiration of another
organism B Same molecule of glucose produces 35 ATP
molecules
I. Which organism is undergoing aerobic respiration?
II. Which type of organism. A or B cam convert glucose into
alcohol?
III. Name ore organism which behaves like B
IV. Name one organism which berhawes The A
SECTION-B (CHEMISERY)
17. A dilute ferrous sulphate solution was gradually added to the beaker containing acidified permanganate solution. The light purple color of the solution fades and slowly disappears. Which of the following is the correct explanation for the dilution?
(a) KMnO4 is an oxidising agent it oxidise FeSO4
(b) FeSO4 acts as an oxidising agent and oxidies KMnO4
(c) The color disappears due to dilution no reaction is involved
(d) KMnO4 is an unstable compound and decomposes in presence of
FeSO4 to a colourless compound
18. Four statements about the reactions of oxides with dilute
hydrochloric acid and aqueous sodium hydroxide are listed :
I. Aluminium oxide reacts with both dilute HCl and aqueous sodium
Bichloride.
II. Calcium oxide reacts with dilute HCl and aqueoys sodium
Hydroxide
III. Zinc oxide reacts with bas dilute HD and aqueous sodium
bichlroide
IV. Sulphur dioxide does not mact with either dilute HCl or aqueous
NICH
Which statement are correct?
(i) I and II (ii) I and III (iii) II and IV
(iv) III and IV
19. A student acids lead and silver to two different test tubes containing
an equal amount of copper sulphate solution. The student observes
that the colour of the sulphate solution in the test tube with lead
changes. What explains the change in the colour of the solution?
(a) A displacement reaction takes place as lead replaces copper
from the solution.
(b) A combination reaction takes place as lead combines with
sulphate in the solution.
(c) A decomposition reaction takes place as copper dissociates from
sulphate in the solution.
(d) A double displacement reaction takes place as copper
dissociates from sulphate and lead combines with sulphate in
the solution.
20. Which one of the following can be used as an acid-base indicator by a
Visually impaired student?
(a) Litmus (b) Turmeric (c) Vanilla essence. (d) Petunia leaves
21. The pH of the gastric juices released during digestion is
(a) less than 7. (b) more than 7 (c) equal to 7 (d) equal to 0
22. Sodium hydrogen carbonate when added to acetic acid evolves a gas.
Which of the following statements are true about the gas evolved?
(i) It turns lime water milky.
(II) It extinguishes a burning splinter.
(iii) It dissolves in a solution of NaOH.
(iv) It has a pungent odour.
(a) (i) and (ii) (b) (i), (ii) and (iii)
(c) (ii), (iii) and (iv) (d) (i) and (iv)
23. Barium chloride on reacting with ammonium sulphate forms barium
sulphate and ammonium chloride. Which of the following correctly
represents the type of the reaction involved?
(i) Displacement reaction (ii) Precipitation reaction
(iii) Combination reaction (iv) Double displacement reaction
(a) (i) only (b) (ii) only
(c) (iv) only. (d) (ii) and (iv)
24. Assertion (A): In alkanes, alkenes and alkynes, valency of carbon is
always four.
Reason (R): All hydrocarbons except alkanes contain double bonds.
25. The blue-coloured solution of the sulphate salt of a metal W is taken
in a beaker. Metal powders X, Y and Z are added one after the other to
the beaker. The colour changes occurring in the solutions are shown
below:
WSO4(blue solution)→ →→(Metal X) →→→ Colorless solution
Colorless solution→→→→(Metal Y) →→→→ pink solution
pink solution →→→→(Metal Z) →→→→Green solution
State what colour change, if any will occur if metal X is again added to
the green solution in the beaker. Explain why.
A. During extraction of metals, electrolytic refining is used to
obtain pure metals.
(a) Which materials will be used as anode and cathode for
refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after
passing electric current?
(d) Silver on corrosion turns into another coloured substance.
Identify this substance and its colour.
OR
26. A teacher asks her students to identify a metal M. She gives them the
Following clues to help them to identify the metal:
(i) Its oxide reacts with both HCl and NaOH.
(ii) It doesn't react with cold or hot water but reacts with steam.
(iii) It can be extracted by the electrolysis of its ore.
(a) Identify the metal M.
(b) Write the chemical equations for its reactions with HCl and NaOH.
(c) What would happen if metal M is reacted with iron oxide?
(d) What could be the pH range of aqueous solution of the gas X ?
27. On heating blue coloured powder of copper (II) nitrate in a boiling
tube, copper oxide (black), oxygen gas and a brown gas X is formed.
(a) Write a balanced chemical equation of the reaction.
(b) Identify the brown gas X evolved.
(c) Identify the type of reaction.
(d) What could be the pH range of aqueous solution of the gas X?
28. Case Study (internal choice in sub-part b)
Sara's mother owns a bakery where different varieties of cakes are
baked. They also prepare different kinds of breads in their bakery. For
baking cakes and breads, she uses baking powder. However, Sara has
also seen her mother using baking soda in her kitchen sometimes for
cooking certain food items like crispy pakoras. Sara was curious about
the two different things being used for cooking and asked her mother
to explain the difference between the two
Based on the above information, answer the following questions
(a) How is baking soda different from baking powder?
(b) Write the reaction when baking soda gets heated at high
temperature?
OR
(b) Which gas causes rising of cakes while baking? How can it be
tested?
(c) If Sara's mother used baking soda instead of baking powder, how
will it affect the taste of the cake and why?
29. Attempt either option A or B.
A. (i) A compound X is formed by the reaction of a carboxylic acid
C2H4O2 and an alcohol in presence of a few drops of H2SO4.
The alcohol on oxidation with alkaline KMnO4 followed by
acidification gives the same carboxylic acid as used in this
reaction. Give the names and structures of:
(a) carboxylic acid, (b) alcohol and
(c) the compound X.
Also write the reaction.
(II) Name the functional groups present in the following
compounds:
(a) CH3COCH2CH2CH2CH3 (b) CH3CH2CH2CH2CHO
OR
B. The electronic structures of atoms P and Q are shown below:
Based on the information given above, answer the following
questions:
(a) If P and Q combine to form a compound, what type of bond is
formed between them?
(b) Give the chemical formula of the compound formed.
(c) The compound so formed is dissolved in water. What is the
nature of the resultant solution? Justify your answer.
(d) Write the chemical equation for the reaction between 'P' and
ethanol.
(e) Show the bond formation in the electron dot structure of the
elemental form of Q.
SECTION - C (PHYSICS)
30. How will the image formed by a convex lens be affected, if the upper
half of the lens is wrapped with a black paper?
(a) The size of the image will be reduced to half.
(b) The image of the upper half of the object will not be formed.
(c) The brightness of the image will reduce.
(d) The lower half of the inverted image will not be formed.
31. Neha's parents are suffering from a vision defect. Her mother needs a
lens of power +2D for correcting her near vision and her father needs
a lens of +5D for correcting his far sightedness. Which of the
following will be the ratio of the focal lengths of lenses required by
her mother and father to correct these defects?
(a) 2:1 (b) 1:5 (c) 1:2 (d) 5:2
32. Assertion (A): The deflection of a compass needle placed near a
current carrying wire decreases when the magnitude of
an electric current in the wire is increased.
Reason (R): Strength of the magnetic field at a point due to a current
Carrying conductor increases on increasing the current
in the conductor.
33. Aditya sitting at the back bench in a class is not able to see what is
written on the black board. He, however, sees it clearly when sitting
on the front bench at an approximate distance of 1.5 m from the
blackboard.
Draw ray diagrams to show the image formation when he is seated at
back bench: -
(i) without wearing any corrective lens
(ii) wearing a corrective lens of suitable power
34. Attempt either option A or B.
A. (a) In the given figure, a light ray travels from air into the semi-
circular plastic block. Give a reason why the ray does not
refract at the semi-circular boundary of the plastic block.
(b) Complete the ray diagram of the above scenario when the light
ray comes out of the plastic block from the top flat end.
OR
B. (a) How will the focal length of a mirror change when 'u' (object
distance) is changed by moving the object towards or away
from the mirror?
(b) A concave mirror produces a real image 6 cm tall of an object 2
cm tall placed at 10 cm from the mirror. Calculate the position
of the image.
35. 1 (a) We wish to obtain an equal size inverted image of a candle
flame on a screen kept at a distance of 4 m from the candle
flame.
(1) Name the type of lens that should be used.
(II) Find the focal length of the lens.
(III) Draw a labelled diagram to show the image formation in
this case.
(b) The image formed by a lens for all the positions of an object
placed in front of it is always erect and diminished, what is the
nature of the lens?
36. (a) Rakesh wanted to study V-I relationship for a nichrome wire.
Draw the circuit diagram which Rakesh has employed in his
experimental study.
(b) Name and state the law which can be verified by Rakesh's
experimental setup.
(c) Write one property of nichrome wire and state any one
application of nichrome in the design of an electrical appliance
such as electric iron / heater.
37. (a) Name any two phenomena that are observed when white light
passes through a prism.
(b) Draw a labelled diagram to represent the above situation.
(c) A child observed a beautiful spectrum of colours when sunlight
coming through the glass prism is allowed to fall on the wall.
Name the colour of the spectrum which is scattered the (i) most
(ii) least by the fine particles present in air.
38. Case Study (Internal choice in sub-part c)
Jyoti has five identical resistors of 30 each, three ammeters, two
voltmeters, a plug key, connecting wires and a voltage source. She
constructed a circuit as shown below. If the reading of the ammeter
A1 is 2 A, answer the following questions:
(a) What is the relationship between the readings of A1 and A3 ? Give
reason for your answer.
(b) Differentiate between an ammeter and a voltmeter on the basis of
its connection in the circuit diagram.
(c) Determine the reading of the voltmeter V1.
OR
(c) Find the total resistance of the circuit.
39. Attempt either option A or B.
A. (a) Draw a diagram to show the pattern of magnetic field produced
by a current carrying solenoid.
(b) A current carrying wire is placed between north (N) and south
(S) poles of a magnet as shown in the given figure. In which
direction does the wire tend to move?
(c) Study the given experimental set-up carefully and answer the
following questions:
(i) What happens to the rod AB placed in the magnetic field of
a U-shaped magnet then the key K is plugged in the circuit?
(ii) Write any two ways by which direction of force can be
reversed.
(iii) When will the magnitude of the force be highest?
OR
B. (a) State the rule used to find the force acting on a current
carrying conductor placed in a magnetic field.
(b) A uniform magnetic field exists in the plane of the paper
pointing from left to right as shown in the figure. Determine
the direction of force on an electron if it enters at right angle to
the field
(c) In our houses we receive A.C. electric power of 220 V. In
electric iron or electric heater cables having three wires with
insulation of three different colours - red, black and green are
used to draw current from the mains.
(i) What are these wires called? Name them colour wise.
(ii) What is the potential difference between the red wire and
black wire.
(iii) What is the role of the wire with green insulation in case of
accidental leakage of electric current to the metallic body
of an electrical appliance.
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