CBSE class X Science latest Sample paper board exam 2020 - Future Study Point

CBSE Class X Science latest Sample paper board exam 2020

Studying sample papers of maths, science or of any other subject will boost your preparation of CBSE board exams,  the test or midterm examinations papers can’t give you enough idea of the kind of questions would be asked in the current board examinations although the teachers or school administration do their best but only certain numbers of the students could get its benefit who are punctual in doing their homework and update their class workbook and follows the school norms and obedient to their parents. Many of the students are exceptionally do better in the examination due to their special preparation plan of 2 or three months.

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CBSE Class X Science latest Sample paper board exam 2020

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Central board of secondary education

Class -X

Science- 095

SAMPLE QUESTION PAPER 2019-20

TIME: 3 Hrs.                                                                                                                   M.M:80

General Instructions:

1. The question paper comprises three sections – A, B, and C. Attempt all the sections.
2. All questions are compulsory.
3. Internal choice is given in each section.
4. All questions in Section A are one-mark questions comprising MCQ, VSA type and assertion-reason type questions. They are to be answered in one word or in one sentence.
5. All questions in Section B are three-mark, short-answer type questions. These are to be answered in about 50 – 60 words each.
6. All questions in Section C are five-mark, long-answer type questions. These are to be answered in about 80 – 90 words each.
7. This question paper consists of a total of 31 questions

Section A

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1) Define catenation.

2)  How does the valency of an element vary across a period?

3)  Answer question numbers 3(a) – 3(d) on the basis of your understanding of the following paragraph and the related studied concepts.

Renewable energy sources such as wind energy are vital for the Indian economy, not only from the point of view of supply but also from the perspective of environmental and social benefits. India is the world’s fifth-largest wind-power producer and the largest windmill facilities in India are installed in Tamil Nadu. Muppandal is a small village of Tamil Nadu and one of the most important sites of wind-farm in the state. It uses wind from the Arabian Sea to produce renewable energy. The suitability of Muppandal as a site for wind farms stems from its geographical location as it has access to the seasonal monsoon winds.

The electrical generators used on wind turbines in sites like Muppandal, produce an output AC of 240 V and a frequency of 50 Hz even when the wind speed is fluctuating. A 2 Central Board of Secondary Education transformer may be required to increase or decrease the voltage so it is compatible with the end usage, distribution or transmission voltage, depending on the type of interconnection.

3(a) State the principle behind electric generator.

3(b) The output frequency of wind turbine is 50 Hz. What is meant by this statement?

3(c) Why do you think Muppandal is at an advantageous position for this project?

3(d) Based on the data represented in the graph below, which of the two cities A or B would be an ideal location for establishing a wind-farm and why?

4)  The presence of a particular group of bacteria in water bodies indicates contamination. Identify the group.

5)  What is meant by it that the frequency of the electric current in your household is 50 hertz.

6)  When a 5-volt battery is connected across an unknown resistor there is a current of 200 mA in the circuit. The value of the resistance of the resistor is.

i)  50 Ω

ii) 25 Ω

iii)40 Ω

iv) 2.5 Ω

7)  The electric power is equivalent to

i) Product of electric energy and time

ii) The product of voltage and electric current

iii) The product of resistance and electric current

iv) The product of charge and time

8) The position of four elements P, Q, R, and S are shown below in the modern periodic table. Which element is most likely to form acidic oxide.

i) P

ii) Q

iii) R

iv) S

OR

9) Elements A, B, C, and D have atomic numbers 12,  16, 28 and 17 respectively. Which of them are reactive non-metals?

i) A

ii) B

iii) C

iv) D

10)  When we enter a dark room coming from outside immediately the things inside the room do not appear clear to our eyes. This is because.

1. i) light travel  slower in a dark
2. ii) pupils take time to adjust

iii)pupils open very quickly in the dark

1. iv) pupils do not open at all in the dark

11) Mention any one point of difference between pepsin and trypsin.

12)In the human being, the respiratory pigment is hemoglobin which has a very high affinity for oxygen. Where does this pigment is present in the body?

13)Which greenhouse gas is produced when coal and petroleum are burnt.

14) Write the equation for the reaction of iron with water.

15) If the focal length of a lens is 50 cm then find its power,
16) What is the use of separation of the right and left side of the heart?

Section B

17) Name the electric device that converts mechanical energy into electrical energy. Draw the labeled diagram and explained the principle involved in this device.

OR

1. i) Explain what is short-circuiting in electric supply.
2. ii) What is the function of the earth wire in the electrical instrument?

iii) What is the usual  current rating of fuse wire in the line to feed

(a) Lights and fan         (b) Appliances of 2kW or more power

18) Explain the way in which glucose is broken down in the absence of oxygen.

OR

List three differences between arteries and veins.

19) How do Mendel’s experiments show that traits may be dominant or recessive?

20) Our government launches campaigns to provide information about AIDS prevention, testing, and treatment by putting posters, conducting radio shows and using other agencies of advertisements.

1. a) To which category of diseases AIDS belong? Name its causative organism.
2. b) Which kind of value is the government trying to develop in the citizens by conducting the above kind of programs?

21) “pH has great importance in our daily life” explain by giving three examples.

OR

A compound that is prepared from gypsum has the property of hardening when mixed with a proper quantity of water. Identify the compound and write its chemical formula. Write the chemical equation for its preparation. Mention anyone use of the compound.

22) (a) The speed of light in air is  m/s and the speed of light in water is . m/s Calculate the refractive index of water.

(b) If the radius of curvature of a lens is 40 cm then find its focal length.

(c) State the mirror formula and its magnificence.

23) Three resistors of 5Ω, 12Ω and 20Ω respectively are connected to a battery of 12V as shown in the circuit given below.

(a) Current through each resistance.

(b) The total current in the circuit.

(c) The total resistance in the circuit.

24) Define dispersion of light. How is the scattering of light different from dispersion? Give one example of a natural phenomenon based on each of these.

25)  An NGO is opposing the construction of a dam on a river flowing through a number of villages and forests for the purpose of generating electricity while the Government was insisting that it would bring a number of benefits for the villagers once the project gets completed. List three problems that arise due to the construction of big dams. Suggest a solution to these problems.

10 TH CLASS CBSE SCIENCE IMPORTANT QUESTIONS & ANSWERS

Section C

26)  (i) “Stomata remain closed in desert plants during day time”. How do they do photosynthesis?

(ii) Why do ventricles have thicker muscular walls than atria?

(iii) What are peristaltic movements? Why are fossils considered important in the study of evolution? Explain two ways

27) Explain why carbon forms compound mainly by covalent bonds. Explain in brief two main reasons for carbon forming a large number of compounds. Why does carbon form strong bonds with most other elements?

OR

(i) Solid calcium oxide was taken in a container and water was added slowly to it.

(a) Write the observation.

(b) Write the chemical formula of the product formed

28) (i) State the law of refraction of light. Explain the term absolute refractive index of a medium and write an expression to relate it with the speed of light in vacuum.

(ii) The absolute refractive index of two medium ‘A’ and ‘B’ are 2.0 and 1.5 respectively. If the speed of light in medium ‘B ‘ m/s. calculate the speed of light in :

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(a) medium A

(b) vacuum

29) (i) Write the functions of the following parts in the human female reproductive system:

(a) Oviduct

(b) Uterus

(c) Ovary

(ii) Describe the structure and function of the placenta.

OR

(i) Define the terms pollination and fertilization.

(ii) Distinguish between self-pollination and cross-pollination.

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30)  State the reason for the following:

(i) Aluminum oxide is called an amphoteric oxide.

(ii) An iron strip dipped in a blue copper sulfate solution turns the blue

solution pale green.

(iii) Hydrogen gas is not evolved when most metals react with nitric acid.

(iv) Calcium does not occur in the free state in nature.

(v) Sodium or potassium metals are kept immersed under kerosene.

31)  (i) Consider a conductor of resistance ‘R’, length ‘L’, thickness’ and resistivity ‘ρ’. Now, this conductor is cut into four equal parts. What will be the new resistivity of each of these parts? Why?

(ii) Find the resistance if all of these parts are connected in:

(a) Parallel

(b) Series

(iii) Out of the combinations of resistors mentioned above in the previous part, for a given voltage which combination will consume more power and why? or will consume more power and why?

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