 The preparations for the UP Board exam are getting more serious as the exam dates are coming closer.

For the students who will be appearing this year will be a bit nervous and uncertain about the type of questions that might come for the exam.

Here is the Unsolved Modle Paper for Class 10th Science that will help you score better in the board exam. The practice paper is given here which is very useful for students of the UP Board of Examination, Class 10th.

## Model Paper UP Board -2020 (Science)

Time - 3 hours 15 minutes
Integer: 70
Note - 15 minutes is scheduled for the candidates to read the question paper.

General Instructions :
(i) This paper is divided into three sections 'A', 'B' and 'C'.
(ii) The first question of each section is multiple-choice of which four alternatives are given. Write the correct option in your answer book.
(iii) It is necessary to do all the questions of each section simultaneously. Each section should be started on a new page.
(iv) All questions are compulsory.
(v) The marks assigned to the questions are given in front of them.

### Section - A

Question 1. (a) What is the relation between curvature radius (r) and focus distance (f) is - (1 mark)
(a) r = f
(b) 2r = f
(c) r = 2f
(d) rxf = 1

(B) The reason why the sky appears blue - (1 mark)
(a) Reflection
(b) Refraction
(c) Alphabet deflection
(d) Scattering

(C) The potential voltage on the ends of a resistive wire is 1.5 volts. In this, 15 joules of energy is produced when the current flow for 20 seconds. The current generated in the resistive wire is- (1 mark)
(a) 0.5 ampere
(b) 2 amperes
(c) 5 amperes
(c) 10 amperes

(D) The magnitude of the force on the current-carrying conductor of length perpendicular to the field in uniform magnetic field B is - (1 mark)
(a) B / Ll
(b) I / BL
(c) BIL
(d) BL / I

Question 2. (a) Which color of visible light has maximum and minimum wavelength? (1 + 1 = 2 digits)
(B) The focus distance of a lens is - 2.0D. State its focus distance and nature. (2 marks)
(C) Why do we prefer the convex mirror as the rearview mirror in vehicles? (2 marks)

Question 3. (a) Explain the working of a human eye by making a picture of it. (4 marks)
Or
(i) Explain the laws of refraction of light.
(ii) With the help of ray diagram, describe the position, shape, and nature of the image of the object between the focus and curved centre of the convex lens.

(B) What do you understand by electromagnetic induction? Explain Fleming's right-hand rule for the direction of electrical current generated by electromagnetic induction. (2 + 2 = 4 marks)

Question 4. In an office, 10 LEDs Bulbs of 9 Watt are used for up to 4 hours per day, 5 fans of 60 W for 12 hours per day, a 100 Watt refrigerator for 24 hours per day, and a 1.5 KW air-conditioner for 10 hours per day are used. Find the price of total electrical energy spent in a month in the office at a rate of 4 per unit. (7 marks)
Or
What is the difference between direct current and alternate current? Describe graphically the principles and procedure of the direct current generator. (2 + 5 = 7 marks)

### Section - B

Question 5. (a) Hydrogen ion concentration in a solution is 1x10-6 moles per litre. The pH value of this solution is - (1 mark)
(a) 6
(b) 8
(c) 14
(d) 20

(B) Lithium displays diagonal relationship - (1 mark)
(a) with beryllium
(b) with sodium
(c) with magnesium
(d) with aluminum
The preparations for the UP Board exam are getting more serious as the exam dates are coming closer.

For the students who will be appearing this year will be a bit nervous and uncertain about the type of questions that might come for the exam.

Here are some practice questions for computer science which will help you understand the concept better.
(C) Tin is coated in place of zinc on food containers, because - (1 mark)
(a) Zinc is more expensive than a Tin.
(b) Zinc has a higher melting point than Tin.
(c) Zinc is more reactive than Tin.
(d) Zinc is less reactive than Tin.

Question 6. (a) Write the names of the following compounds in the IUPAC method - (2 marks)
(See the formula of compounds in the question paper from the following link.)

(B) Define oxidation and reduction reactions on the basis of an increase or decrease of oxygen. (2 marks)
(C) Give a modern definition of acids and bases. (2 marks)

Question 5. Describe the electrolytic method of refining metals. (4 marks)
Or
Compare the arrangement of elements in the Modern periodic table and Mendeleev's periodic table.

Question 8. Write the chemical equation of the method of making Acetic acid. Explain its esterification and dehydration reactions with chemical equations. Write two uses of it. (2 + 4 + 1 = 7 marks)
Or
Write a brief comment on the following-
(i) Deformed smell
(ii) neutralization reaction
(iii) hydrogenation or combustion of hydrogen
(iv) soap refining process

### Section - C

Question 9. (a) Which of the following hormone deficiency causes diabetes. (1 mark)
(a) gastrin
(b) Insulin
(c) thyroxine
(d) Parathormone

(B) Name the vitamin which dissolves in water - (1 mark)
(a) Vitamin-A
(b) Vitamin-C
(c) Vitamin-D
(d) Vitamin-K

(C) On which plant did Mendel conduct his experiments? (1 mark)
(a) Wild Pea
(b) Garden Pea
(c) Cabbage
(d) Champa

(D) Who led the Chipko movement? (1 mark)
(a) Sudar Lal Bahuguna
(b) Hemvati Nandan Bahuguna
(c) Medha Patkar
(d) Arundhati Roy

Question 10. (A) Write the complete forms of ATP and NADP. (2 marks)
(B) What is family planning? Mention the methods for the planned family. (1 + 1 = 2 marks)
(C) Explain the difference between homozygous and heterozygous organisms. (2 marks)

Question 11. (a) Explain the principle of natural selection. (4 marks)
Or
Write the names of different parts of the alimentary canal and state the names of the juices produced in them and their functions.

(B) What do you understand by the food chain? Describe the different levels present in a food chain. (1 + 3 = 4 marks)
Or
What is acid rain? How does it occur? Write down its major harmful effects.

Question 12. Describe the reproduction of plants in detail. (7 marks)
Or
Describe the functions of different parts of the human brain by drawing a nominated picture of it.

Prepared by - Manoj Kumar, DC Inter College, Mohana