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CBSE 10th Exam 2019: To check your readiness, follow this sample document for science. 10th CBSE Exam 2019: The Jury Examinations for Clbad 10 will take place in February 2019. Students from all over India are preparing for their examination of the Council for Clbad 10 of the Central Council of Canada. secondary education (CBSE). Here is an opportunity to check your readiness for the tables.
Discover this sample of scientific paper for the CBSE Clbad 10 Exam. Take the time to log in correctly. This sample of paper is ready to be filled in three hours and represents a maximum score of 80.
CBSE Clbad 10 2019: See this sample of document in English
General Instructions
(i) Discussion Paper has five sections. – A, B, C, D and E. You must try all sections.
(ii) All questions are mandatory
(iii) Questions 1 and 2 in Section A are one-point questions. You must answer in one word or one sentence
(iv) Questions 3 to 5 in Section B are two-point marks. The answer to these questions should be about 30 words
v) Questions 6 to 15 in Section C are three-point questions. The answer to these questions should be about 50 words each.
(vi) Questions 16 to 21 in Section D are 5-point questions. Answers should be given in about 70 words.
vii) Questions 22 to 27 in Section E are based on practical skills. Each question is a two-point question. You must answer in a nutshell
SECTION A
Q.1 Indicate the role of decomposers in the ecosystem. [1]
Q.2 Mention two ancient water recovery techniques practiced in Rajasthan. [1]
SECTION B
Q.3 Give two distinguishing features between acquired and inherited traits. [2]
Q.4 A substance Z, which is an oxide of a group 2 element, is used extensively in the cement industry. This element is also present in the bones. When treated with water, it forms a solution that turns blue of red sunflower. Identify Z and also write the chemical reactions involved. [2]
Q.5 Draw diagrams showing the defects of the eyes with a lens (i) -1.5D and a lens (ii) +2.5 D. [2]
SECTION C
Q.6 at. Name the organ that is the complete digestion site. [1+2] b. Write the names and function of the enzymes present in the pancreatic juice.
Q.7 Compound X is available as pellets or flakes in the laboratory. Based on the reactions given below. [1+1+1]
Write the chemical names and formulas of A, B and C.
Q.8 Mention three advantages of a solar cell?
Q.9 Suggest different chemical processes used to obtain a metal from its oxides against metals in the middle of the reactivity series, at the bottom of the reactivity series and at the metals up the reactivity series. Support your answer with an example each. [3]
Q.10 a. Name the reproductive parts of a flower. [1+2] b. The testicles are located outside the abdominal cavity in the scrotum. Why
Q.11 In the electrolysis of water: [3]
a) Name the gas collected at the anode and the cathode
b) Why the volume of gas collected Is one electrode double the other
c) What would happen if H 2 SO 4 was not added to the water?
Q.12 Rahul and Shashi were crossing Connaught Place in New Delhi. Their care was moving at a very slow pace. There was such traffic in the alley that their car was barely moving. Rahul told Shashi, "If vehicle manufacturing continues to increase, it will become difficult to live in cities. We must take steps to solve the problem. [3] a. How can we solve this type of intense traffic problem?
b. What are fossil fuels?
c. What are the values indicated by Rahul?
Q.13 Differentiate the arrangement of the elements in Mendeleev's periodic table and the modern periodic table. [3]
Q.14 "pH is of great importance in our daily life". Explain by giving three examples. [3] OR
A compound prepared from gypsum has the property of curing when it is mixed with an appropriate amount of water. Identify the compound and write its chemical formula. Write the chemical equation for its preparation. Mention any use of the compound.
Q.15 A 1 ampere current flows in a series circuit containing an electric lamp and a 5 ohm conductor when connected to a 10 V battery. Calculate the resistance of the electric lamp. Now, if a 10 ohm resistor is connected in parallel with this series combination, what change (if any) in the current flowing in a 5 ohm conductor and what potential difference will occur through the lamp? [1+1+1]
Q.16. a. I. Draw a neat diagram of the human brain. [2+2+1] ii. Label medulla and cerebellum. Write their functions.
b. "Overproduction and underproduction of growth hormones cause bodily disorders." Explain.
SECTION D
Q.17 You received a model of balls and sticks of six carbon atoms and fourteen hydrogen atoms, as well as a number enough sticks. How many ways one can join models of six carbon atoms and fourteen atoms of hydrogen to form different molecules of C6H14. [5]
Q.18 i. A 10 mm long pin is placed vertically in front of a concave mirror. A 5 mm long image of the punch pin is formed 30 cm in front of the mirror. Find the focal length of this mirror. [1+1+1+1+1]
ii. The figure below shows a ray of light as it moves from medium A to middle B. Find the refractive index of medium B with respect to medium A:
iii. The sun's rays converge at a point 15 cm in front of a concave mirror. Where should an object be placed so that the size of its image equals the size of the object? 30 cm
iv. The refractive index of the diamond with respect to the glbad is 1.6 and the absolute refractive index of the glbad is 1.5. Discover the absolute refractive index of diamond.
It is observed that the size of the image of an object with the help of a mirror having a focal length of 20 cm is reduced to 1/3 of its size. How far has the object been placed from the mirror?
Q.19 i. Look for the following information in the electrical circuit shown in the figure below: [3+1+1] a. potential difference on a 4 ohm resistor
b. power dissipated in a 4 ohm resistor
c. the difference of reading of the ammeter.
ii. What will be the energy used by the battery if it has to emit 6.28 x 10 18 electrons with a potential difference of 20 V on the terminal?
iii. What is the minimum resistance that can be obtained with five resistors of 1/5 ohm each?
Q.20 a. Look at the chart and answer the questions. [1+2+2]
i. Identify the given labels.
ii. Give the functions of C and D
b. Using the ray diagram, name all the parts in sequence, through which atmospheric air
reaches the last part of our lungs.
Q.21 i. How to convert an AC generator into a DC generator? [1+3+1] ii. A magnetic compbad needle is placed in the plane of the paper near point A, as shown in Figure
below. In which plane should a right-handed driver conduct driver be placed so that he pbades
through A and the compbad deviation does not change? Under what conditions is the maximum deviation
and why?
iii. AB is a live conductor in the plane of the paper, as shown in the figure below. What are the directions of the magnetic fields that it produces at points P and Q? With r1> r2, where will the strength of the magnetic field be greater?
SECTION E
Q.22 Jiya observed the temporary erection of the skin of the leaves. She watched the open stomata.
Draw a net diagram of the same thing. [2]
Q.23 What do you observe when you drop a few drops of acetic acid in a test tube containing:
a) phenolphthalein c) distilled water [19659057] b) Universal Indicator d) Sodium hydrogencarbonate
Q.24 Observe the diagram and identify X and Y. Give the function of X. [2]
]
Q.25 Riya performs two sets of experiments to study the length of formed foam, as follows:
as follows:
Series I: it takes 10 ml of distilled water in test tube "A" and add 5 -6 drops of liquid soap and vigorously shake the test tube.
Set II: it takes 10 ml of distilled water in a test tube "A" and adds 5-6 drops of liquid soap with half a spoonful of CaSO4 in
Write your observation and the reason [19659008] Q .26 A student performs an experiment and traces the graph VI of three samples of nichrome wire
of resistances respectively R1, R2 and R3. [Refer the figure below] Which of the following
is true and why?
(a) R1 = R2 = R3 b) R1> R2> R3 c) R3> R2> R1 (d) R2> R3> R1 [2] [19659009]
Q.27 In which of the following conditions can a concave mirror to form an image larger than
the real object? Using a diagram, confirm your answer.
a. When the object is maintained at a distance equal to its radius of curvature
b. When an object is held at a distance less than its focal length
c. When an object is placed between the focus and the center of curvature
d. When an object is held at a distance greater than its radius of curvature
– The document is prepared by TGT Science, VidyaGyan School, Bulandshahr
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