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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.

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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.

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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

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RailwayLevel1_1Lakh_VacancyDo trends as X users demand more vacancies

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RRB Vacancy

The Railway Recruitment Board (RRB) has officially released the much-anticipated RRB Group D Notification for 2025, opening a staggering 32,438 vacancies within the Indian Railways. This large-scale recruitment drive offers a golden opportunity for candidates aspiring to secure a government job with substantial benefits.

The online registration process will begin on January 23, 2025, and will remain open until February 22, 2025. Aspiring candidates are encouraged to apply during this window to stand a chance to work with one of India’s largest and most respected organizations.

A prestigious career path

The recruitment is for Level 1 posts under the 7th Central Pay Commission (CPC) Pay Matrix, with an initial salary of Rs. 18,000 per month. Along with the competitive pay, selected candidates will also benefit from job security, travel allowances, and other perks. Indian Railways, known for its extensive and vital role in the nation’s transportation, promises employees an enriching career.

Candidates are advised to prepare thoroughly for the selection process, which will include a structured and transparent procedure, ensuring a fair chance for everyone interested in this prestigious opportunity.

Mixed reactions on X

As the notification went live, it sparked mixed reactions across social media platforms. On X, the hashtag #RailwayLevel1_1Lakh_VacancyDo trended as job seekers expressed both excitement and frustration. While many expressed gratitude for the large number of vacancies, some users took to X to voice concerns over the competitive nature of the recruitment process.

One user tweeted:

In response to the announcement of the 32,438 vacancies for RRB Group D posts, X users expressed their frustration over the limited number of openings, stating:

This sentiment is echoed by many, with users online questioning the adequacy of the number of positions available for the vast number of job seekers across the country.

X users voice concerns over timing of RRB Group D recruitment

Despite the differing opinions, the general sentiment remained positive, with most users acknowledging that the sheer number of vacancies increases the chances for a wider pool of candidates.

Looking ahead

Candidates eager to apply should stay updated with the official notifications and guidelines for the recruitment process. The release of the RRB Group D Notification 2025 marks an important milestone in the Indian Railways’ ongoing efforts to bolster its workforce and contribute to the country’s growth.

The recruitment process is expected to be highly competitive, and with only a month to apply, job seekers are urged to prepare diligently for this career-defining opportunity.

Stay tuned for more updates, and don’t forget to check out the RRB Group D notification screenshot shared in this post for detailed information.

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Education

CAT 2024 results declared: 14 achieve 100 percentile, majority from Maharashtra

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The Indian Institute of Management (IIM) Calcutta has announced the Common Admission Test (CAT) 2024 results, bringing an end to the anticipation of nearly 2.93 lakh aspirants. Candidates can now access their scorecards by logging in with their registration number and password on the official website iimcat.ac.in.

This year, 14 candidates secured the prestigious 100 percentile. Notably, 13 of them come from engineering backgrounds, while only one is a non-engineer. Among the top performers, there is just one woman. Maharashtra emerged as a stronghold for top scorers, with the majority hailing from the state.

The provisional answer key was released on December 3, with candidates given until December 5 to raise objections. However, no changes were made to the provisional keys.

Experts have described CAT 2024 as relatively easier compared to the past two years, leading to expectations of higher cut-offs for admission.

Out of the total 2.93 lakh candidates who appeared for the test:

  • 1.86 lakh were male candidates,
  • 1.07 lakh were female candidates, and
  • 5 candidates identified as transgender.

This diverse group of test-takers reflects the growing interest in management education across all demographics.

Candidates with valid CAT 2024 scores can now register for admission to postgraduate programmes at IIMs and other participating institutes. The final selection process will consider the CAT score, along with other criteria like academic performance, work experience, and performance in rounds such as the Written Ability Test (WAT), Group Discussion (GD), and Personal Interview (PI).

The CAT exam continues to serve as a gateway to the country’s top business schools, paving the way for aspirants to excel in diverse fields of management and entrepreneurship.

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Education

10 schools in Kanpur get bomb blast threat through emails

The district administration has rushed the bomb disposal squad to the schools in order to sanitise the premises. Joint Commissioner of Police Law and Order, Harish Chander said the police’s cyber cell is investigating the matter.

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At least 10 schools in Kanpur received threatening emails on Wednesday which triggered panic in the city. This comes after a number of such emails threatening schools and hospitals with bomb blasts in many cities across India, including Delhi were received. The emails have come through servers which are based in Russia.

According to reports, the emails threatened to blow up the schools. The district administration has rushed the bomb disposal squad to the schools in order to sanitise the premises. Joint Commissioner of Police Law and Order, Harish Chander said the police’s cyber cell is investigating the matter.

Speaking to the media, Chander said the Kanpur Police received information about a bomb threat to various schools. The cyber cell is investigating the matter. All officials have been instructed to monitor CCTV footage thoroughly to establish a link between this threat and previous bomb threats which were received by multiple schools, airports and hospitals.

He also urged parents not to a panic. On Tuesday, 8 schools in Bengaluru received emails threatening bomb blasts. Last week, the city’s popular hospital chain, St Philomena, received a bomb threat email. All these bomb threat emails later turned out to be hoaxes.

 Bhavan Bangalore School, Bengaluru Scottish School, Deeksha High School, Jain Heritage School, Chitrakoota School, Edify Schools, Giridhanva School and Gangothri International Public School were among those that received the threat email from the same domain, Beeble.com.

Delhi’s GTB Hospital, Deep Chand Bandhu Hospital, Hedgewar Hospital and Dada Dev Hospital also received bomb threats via email. The city’s administration scrambled bomb detection team, the bomb disposal squad, fire department and the local police to conduct searches. Over the last one month, Indira Gandhi International Airport, over 20 hospitals and more than 100 schools across Delhi-NCR region have received such threats, but all of them turned out to be hoaxes. On Monday, over 50 schools in Jaipur received similar bomb threat emails.

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