Oswaal Science Sample Paper 1 Class 10 CBSE Science Sample Paper Solutions Board Exam 2025 скачать в хорошем качестве

Oswaal Science Sample Paper 1 Class 10 CBSE Science Sample Paper Solutions Board Exam 2025

In this video you will learn how to solve questions of Oswaal Sample Paper 1 Class 10 Science Session 2025-26 Detailed Solutions CBSE BOARD EXAM 2026 #samplepaper Science Sample Paper -1 ‎Follow the Prakash Tutorial channel on WhatsApp: https://whatsapp.com/channel/0029Va9I... Telegram channel: 📢📢 https://t.me/Prakashtutorial 📢📢 Amrita electrolysed distilled water using the set-up shown in figure 1. She was expecting two gases The following activity is set-up in the science lab by the teacher. He clamped an aluminium wire on a stand and fixed a pin to the free end of the wire using wax. Then he heated the wire with a burner from the end where the wire is clamped. Students observed the pin fall off. A. If the teacher replaces aluminium wire by silver wire, will the students' observation change? Justify your answer. B. Will the aluminium wire melt? Give reason for your answer. An element 'X' is stored in kerosene, and cannot be extracted from its ore using a reducing agent. 'X' forms an ionic compound on reaction with chlorine. (i) Can we store 'X' in water? Give reason to support your answer. (ii) Identify element 'X'. Name the process used and write the equation for extraction of 'X' from its ore. A hydrocarbon with the formula 𝑪_𝒙 𝑯_𝒚 undergoes complete combustion as shown in the following equation: 𝟐𝑪_𝒙 𝑯_𝒚+𝟗𝑶_𝟐→𝟔𝑪𝑶_𝟐+𝑯_𝟐 𝑶 (a) What are the values of 'x' and 'y'? (b) Give the chemical (IUPAC) name of the hydrocarbon. (c) Draw its electron dot structure. (d) Name the alcohol which on heating with conc. 𝑯_𝟐 〖𝑺𝑶〗_𝟒 will produce the above hydrocarbon 𝑪_𝒙 𝑯_𝒚 . (e) Write a balanced chemical equation for the reaction of 𝑪_𝒙 𝑯_𝒚with hydrogen gas in presence of Nickel. 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. Is the resultant solution acidic or basic in nature? Justify your answer. (d) Write the chemical equation for the reaction between 'Q' and ethanol. (e) What will be the formula of the compound formed when 'P' undergoes bonding with carbon? 33. The above image shows the formation of an image with an optical instrument. A. Identify the optical instrument (shown schematically as a rectangle) in the image. B. What type of image is formed in this case? C. Based on the measurements given in the image, calculate the focal length of the instrument. 34. Find out the following in the electric circuit given in the figure- (i) Effective resistance of two 8 ohm resistors in the combination. (ii) Current flowing through the 4-ohm resistor 34. B. Study the circuit and find out- (i) Current in 12 ohm resistor (ii) Difference in the readings of ammeter A1 and A2 if any 35. The above image shows a corrective measure for a particular defect of vision. (i) Identify the defect of vision and state what kind of lens is used to correct this deficiency. (ii) Draw and label a ray diagram that shows the defect of vision in the above case before correction. A student needs to make a 0.12 Ω resistor. She has some copper wire of 0.80 mm diameter. Resistivity of copper is 𝟏.𝟖×〖𝟏𝟎〗^(−𝟖) 𝛀𝒎 (i) Determine the cross-sectional area of the wire. (ii) Calculate the length of wire required for the 0.12 Ω resistor. 37. Magnetic field lines are shown in the given diagram. A student makes a statement that the magnetic field at X is stronger than at Y. (i) Explain with reason if the student's claim is correct. (ii) Also redraw the diagram and mark the direction of magnetic field lines. 38. The above image is that of a Digital Single Lense Reflector (DSLR) Camera which are used to take high resolution photographs by professional photographers. The second image of the above two is a schematic diagram of how an image is formed on the sensor of the camera. Based on your understanding of the lenses, answer the following questions. A. What type of lens is used in the DSLR camera shown in the image? B. What type of image is formed on the sensor? Attempt either subpart C or D. 39. A. The arrangement of resistors shown in the above figure is connected to a battery.; The power dissipation in the 100 Ω resistor is 81 W. Calculate (i) the current in the circuit (ii) the reading in the voltmeter V2 (iii) the reading in the voltmeter V1 39. B. An electric heater consists of three similar heating elements A, B and C, connected as shown in the figure above. Each heating element is rated as 1.2 kW, 240 V and has constant resistance. S1, S2 and S3 are respective switches. The circuit is connected to a 240 V supply. (i) Calculate the resistance of one heating element. (ii) Calculate the current in each resistor when only S1 and S3 are closed. (iii) Calculate the power dissipated across A when S1, S2 and S3 are closed.