UP Board Exam 2021
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Most of the students are unaware of the topics for which they should study first for the upcoming test. We are providing Sample Question Papers for the candidate’s convenience.
The practice of the sample papers will make the students more confident and will make them ready for the exams. Keep practicing and check here for more details on the UP Board Exam 2021.
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Class 10 Science Sample Paper
UP Board 2020-2021
Time Allowed: 3 Hours
General Instructions: Maximum Marks: 80
SAMPLE QUESTION PAPER 2020-21
a) The question paper is divided into four sections – Section A, Section B, Section C, and Section D.
b) The question paper has 26 questions in all.
c) All questions are compulsory.
d) Marks are indicated against each question.
e) Questions from serial numbers 1 to 7 are multiple-choice type questions. Each question carries one mark.
f) Questions from serial numbers 8 to 18 are very short answer questions.
g) Questions from serial numbers 19 to 25 are short answer questions.
h) Question number 26 is a long answer type question of 5 marks.
(1 X 7=7)
1. Magnesium ribbon is rubbed before burning because it has a coating of
(a) basic magnesium carbonate
(b) basic magnesium oxide
(c) basic magnesium sulphide
(d) basic magnesium chloride
2. A man with blood group A marries a woman having blood group O. What will be the blood group of the child?
(a) O only
(b) A only
(d) Equal chance of acquiring blood group A or blood group O
3. Which one of the following is an artificial ecosystem?
(d) Crop field
4. Main function of the cerebrum is
5. The magnetic field lines always begin from
(a) N-pole and end on S-pole.
(b) S-pole and end on N-pole.
(c) start from the middle and end at N-pole.
(d) start from the middle and end at S-pole.
6.The most important safety method used for protecting home appliances from short-circuiting or Overloading is
(b) use of stabilizers
(c) use of fuse
(d) use of electric meter
7. Magnifying power of a concave lens is
(a) always > 1
(c) always = 1
(d) can have any value
SECTION B (3 X 11=33)
8. Draw the magnetic field lines around a straight current-carrying conductor.
9. State the role of the pancreas in the digestion of food.
10. Why should curd and sour substances not be kept in brass and copper vessels?
11. When a 12-volt battery is connected across an unknown resistor, there is a current of 2.5mA in the circuit. Find the value of the resistance of the resistor.
12. In birds and mammals the left and right side of the heart are separated. Give reasons.
13. The number of carbon compounds is more than those formed by all other elements put together. Justify the statement by giving two reasons.
14.Explain the ways in which glucose is broken down in absence of oxygen.
15. Plastic cups were used to serve tea in trains in the early days- these could be 3 returned to the vendors, cleaned, and reused. Later, Kulhads were used instead
of plastic cups. Now, paper cups are used for serving tea. What are the reasons for the shift from Plastic to Kulhads and then finally to paper cups?
16. In birds and mammals the left and right side of the heart are separated. Give reasons.
17. A.Explain the formation of Calcium Chloride with the help of electron dot structure.
(At numbers: Ca = 20; Cl = 17)
B. Why do ionic compounds not conduct electricity in the solid-state but conduct electricity in a molten and aqueous state?
18. Identify the compound of calcium that is used for plastering of fractured bones. With the help of a chemical equation, show how it is prepared and what special precautions should be taken during the preparation of this compound.
SECTION C (5 X 7 = 35)
19. A compound A (C2H4O2) reacts with Na metal to form a compound ‘B’ and evolves into a gas that burns with a pop sound. Compound ‘A’ on treatment with an alcohol ‘C’ in presence of an acid forms a Sweet smelling compound ‘D’ (C4H8O2). In addition, NaOH to ‘D’ gives back B and C. Identify A, B, C, and D write the reactions involved.
20. Name the phenomenon that governs the following: – 5
i) Green beetles living in green bushes are not eaten by the crows.
ii) Number of blue beetles in green bushes increases, only because the red beetles living there were trampled by a
herd of elephants.
21.Trace the changes that take place in a flower from gamete formation to fruit 5 formation
22. Draw the magnetic field lines around a straight current-carrying conductor
23. When observed under the high power of the microscope, a ‘chain of buds’ is visible in the microscopic view. In which organism can it be observed? Explain the process.
24. Pertaining to the endocrine system, what will you interpret if- 3
i) You observe swollen neck in people living in the hills
ii) Over secretion of Growth Hormone takes place during childhood
iii) Facial hair develops in boys aged 13.
25.What is meant by the power of a lens? You have three lenses L1, L2, and L3 of powers +10D, +5D, and -10D respectively. State the nature and focal length of each lens. Explain which of the three lenses will form a virtual and magnified image of an object placed at 15 cm from the lens. Draw the ray diagram in support of your answer.
SECTION D (1 X 5 = 5)
26.Prove that the lengths of the tangents drawn from an external point to a circle are equal. Using the above theorem, prove that AB+CD = AD+BC, if a quadrilateral ABCD is drawn to circumscribe a circle.