English हिन्दी
Connect with us

Education

CBSE Class 10th science term 1 board exam: Important 20 assertion reason questions and answers for tomorrow’s exam

Tomorrow is the CBSE Science exam and to make it easier for you all who studies at the last moment, we’ve compiled 20 important assertion reason based questions that can help you top your exam.

Published

on

CBSE Students

Preparing for exams from the beginning of the session is not what students really do and they only study when the tensions of board exams hit them. Then you all know, instead of studying the chapters thoroughly, students look for important questions and answers so that they can prepare themselves with the best.

Not to worry, we are your saviours for tomorrow’s exam. As you all know CBSE is conducting class 10th board exams term 1. The board examination conducted the first exam for class 10th i.e. Social Science yesterday.

Tomorrow is the Science exam and to make it easier for you all who studies at the last moment, we’ve compiled 20 important assertion reason based questions from chapter 1 that can help you top your exam.

Chapter 1 – Chemical Reactions And Equations

In the following questions, a statement of assertion (A) is followed by a statement of the reason (R). Mark the correct choice as:

a) Both A and R are true and R is the correct explanation of A.

(b) Both A and R are true but R is not the correct explanation of A.

(c) A is true but R is false.

(d) A is false but R is true.

  1. Assertion (A): Decomposition of vegetable matter into compost is an example of exothermic reactions.

Reason (R): Exothermic reactions are those reactions in which heat is evolved.

2. Assertion (A): When HCl is added to zinc granules, a chemical reaction occurs.

Reason (R): The evolution of a gas and change in colour indicate that the chemical reaction is taking place.

3. Assertion (A): Calcium carbonate when heated gives calcium oxide and water.

Reason (R): On heating calcium carbonate, a decomposition reaction takes place.

4. Assertion (A): Brown fumes are produced when lead nitrate is heated.

Reason (R): Nitrogen dioxide gas is produced as a by-product due to the decomposition of lead nitrate.

5. Assertion (A): White silver chloride turns grey in sunlight.

Reason (R): Decomposition of silver chloride in presence of sunlight takes place to form silver metal and chlorine gas.

6. Assertion (A): Pungent smelling gas is produced when sulphur burns in the air.

Reason (R): Sulphur trioxide is formed on reaction of sulphur with oxygen.

7. Assertion (A): In a reaction of copper with oxygen, copper serves as a reducing agent.

Reason (R): The substance which gains oxygen in a chemical reaction acts as a reducing agent.

8. Assertion (A): In the electrolysis of water, the volume of hydrogen liberated is twice the volume of oxygen ……formed.

Reason (R): Water (H,0) has hydrogen and oxygen in the ratio of 1:2 by volume.

9. Assertion (A): Corrosion of iron is commonly known as rusting.

Reason (R): Corrosion of iron occurs in presence of water and air.

10. Assertion (A): The balancing of chemical equations is based on the law of conservation of mass.

Reason (R): Total mass of reactants is equal to the total mass of products.

11. Assertion (A): In a balanced chemical equation, the total mass of the reactants is equal to the total mass of the products.

Reason (R): Mass can neither be created nor destroyed during a chemical change.

12. Assertion (A): Iron articles are painted so as to prevent them from rusting.

Reason (R): When the surface of iron is coated with paint, its surface does not come in contact with oxygen and moisture therefore rusting does not take place.

13. Assertion (A): Chemical reaction changes the physical and chemical state of a substance.

Reason (R): When an electric current is passed through water (liquid), it decomposes to produce hydrogen and

oxygen gases.

14. Assertion (A): When calcium carbonate is heated, it decomposes to give calcium oxide and carbon dioxide.

Reason (R): The decomposition reaction takes place on the application of heat, therefore, it is an endothermic reaction.

Read Also: Delhi Nursery Admissions 2022-23 schedule released: Check admission process, important dates and criteria here

15. Assertion (A): Zinc reacts with sulphuric acid to form zinc sulphate and hydrogen gas and it is a displacement reaction.

Reason (R): Zinc reacts with oxygen to form zinc oxide.

16. Assertion (A): Chips manufacturers usually Ilush bags of chips with a gas such as nitrogen to prevent the chips from getting oxidised.

Reason (R): This increases the taste of the chips and helps in their digestion.

17. Assertion (A): Exposure of silver chloride to sunlight for a long duration turns grey due to the formation of silver by decomposition of silver chloride.

Reason (R): In this process, sublimation of silver chloride takes place.

18. Assertion (A): Rusting of iron metal is the most common form of corrosion.

Reason (R): The effect of rusting of iron can be reversed if they are left open in sunlight.

19. Assertion (A): AgBr is used on photographic and X-ray film.

Reason (R): AgBr is photosensitive and changes to Ag and bromine in presence of sunlight and undergoes decomposition reaction.

20. Assertion (A): Magnesium ribbon keeps on burning in an atmosphere of nitrogen.

Reason (R): Magnesium reacts with nitrogen to form magnesium nitride and this reaction is a combination reaction.

Answers

  1. a
  2. b
  3. d
  4. a
  5. a
  6. c
  7. a
  8. c
  9. b
  10. a
  11. a
  12. a
  13. b
  14. b
  15. b
  16. c
  17. c
  18. c
  19. a
  20. a

Continue Reading

Jobs

Amazon to cut 30,000 corporate jobs amid AI-driven restructuring

Amazon will lay off 30,000 corporate employees this week, its biggest cut since 2022, as CEO Andy Jassy drives AI-led efficiency and cost reductions.

Published

on

Amazon

Amazon is preparing to lay off around 30,000 corporate employees this week, marking its biggest job reduction since late 2022, when it eliminated about 27,000 positions. The move is part of CEO Andy Jassy’s ongoing effort to streamline operations and counter overhiring during the pandemic-driven boom.

Largest corporate layoff since 2022

The planned layoffs will affect nearly 10% of Amazon’s corporate workforce — roughly 350,000 employees — though it represents a small portion of the company’s overall 1.55 million-strong staff. The job cuts are expected across multiple departments, including human resources (People Experience and Technology), operations, devices and services, and Amazon Web Services (AWS).

Managers in affected teams were trained on Monday to handle the layoff process before email notifications began rolling out Tuesday morning.

Efficiency push and AI automation

The restructuring comes as Jassy pushes to reduce “bureaucracy” and simplify management layers. Amazon has even introduced an anonymous complaint line to flag inefficiencies, reportedly leading to over 450 process changes.

The company’s increased adoption of artificial intelligence tools has accelerated the shift. Jassy previously said AI automation would eliminate repetitive tasks, potentially reducing headcount. Analysts believe Amazon is realizing significant productivity gains through these technologies, supporting its decision to trim staff.

Pressure on AWS and holiday hiring plans

While AWS remains Amazon’s largest profit driver, its recent growth has lagged behind competitors. AWS reported $30.9 billion in second-quarter sales — up 17.5% — compared to 39% for Microsoft Azure and 32% for Google Cloud. Estimates indicate AWS revenue rose to $32 billion in the third quarter, marking a slight slowdown.

Despite the layoffs, Amazon plans to hire 250,000 seasonal workers ahead of the holiday shopping season, maintaining the same level as the previous two years.

Stock reaction and internal reshuffling

Amazon shares rose 1.2% to $226.97 on Monday, just days ahead of its third-quarter earnings announcement. The company also reorganized a segment of its human resources division focused on diversity initiatives, promoting several employees into new roles.

Continue Reading

Education

CBSE releases tentative datesheets for Class 10, 12 board exams 2026

CBSE has released the tentative schedule for Class 10 and 12 board exams 2026. The exams will run from February 17 to July 15, 2026, for over 45 lakh students across India and 26 countries.

Published

on

CBSE releases tentative datesheets for Class 10, 12 board exams 2026

The Central Board of Secondary Education (CBSE) has announced the tentative datesheets for the Class 10 and Class 12 board examinations for the academic year 2025-26. According to the notification, the exams will be conducted between February 17 and July 15, 2026.

CBSE said that around 45 lakh students are expected to appear in the board examinations, covering 204 subjects across India and 26 countries abroad.

Exams To Be Conducted

The schedule covers multiple categories of examinations, including:

  • Main Examinations for Classes 10 and 12
  • Examinations for Sports Students (Class 12)
  • Second Board Examinations (Class 10)
  • Supplementary Examinations (Class 12)

Along with the written tests, the board will also coordinate practical exams, evaluation, and post-result processes to ensure timely completion and declaration of results.

Evaluation Timeline

CBSE has outlined a structured plan for evaluation. The checking of answer sheets will begin about 10 days after each subject’s exam and is expected to be completed within 12 days.

For example, if the Class 12 Physics exam is held on February 20, 2026, the evaluation process will start on March 3 and conclude by March 15.

Tentative Datesheets

The board clarified that these date sheets are tentative. The final versions will be released after schools submit the final list of candidates appearing for the examinations.

The CBSE has urged schools and students to treat these dates as indicative and to continue their preparations in accordance with the tentative schedule.

Continue Reading

Education

SBI clerk recruitment 2025: Registration begins for 6,589 vacancies, apply now

State Bank of India has initiated the recruitment for 6,589 clerk posts. Online application is now open for eligible candidates with exams scheduled for September and November 2025.

Published

on

SBI clerk recruitment

The State Bank of India (SBI) has officially started the registration process for SBI Clerk Recruitment 2025, inviting applications for 6,589 Junior Associate (Clerk) posts. The online application window opened on August 6, 2025, and interested candidates can apply through the official SBI website.

Of the total vacancies, 5,180 are regular and 1,409 are backlog vacancies. The category-wise breakdown includes 2,255 for General, 788 for SC, 450 for ST, 1,179 for OBC, and 508 for EWS candidates.

Eligibility criteria

Educational Qualification:
Applicants must hold a graduation degree in any discipline from a recognised university. Final-year students are also eligible, provided they complete their degree by December 31, 2025.

Age Limit:
Candidates should be between 20 to 28 years as of April 1, 2025 (born between April 2, 1997 and April 1, 2005). Age relaxation is applicable as per government rules.

Selection process

The recruitment process involves three stages:

  1. Preliminary Examination:
    A 100-mark online test to screen candidates.
  2. Main Examination:
    Comprises 190 questions, carrying 200 marks, with a duration of 2 hours and 40 minutes.
  3. Language Proficiency Test:
    Required for those who haven’t studied the local language in Class 10 or 12.

Importantly, only the marks scored in the Main Exam will determine the final merit list, subject to document verification and the language test.

Exam schedule

  • Preliminary Exam (Tier 1): September 2025
  • Main Exam (Tier 2): November 2025

Application fee

  • General/OBC/EWS: ₹750
  • SC/ST/PwBD/Ex-Servicemen: Exempted from fee

Salary and benefits

Selected candidates will receive a monthly salary ranging from ₹24,050 to ₹64,480 as per the SBI pay scale.

Continue Reading

Trending

© Copyright 2022 APNLIVE.com