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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.

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

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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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Education

CUET-UG: National Testing Agency postpones exam in Delhi

Professor Mamidala Jagadesh Kumar spoke about the examination and said, due to unavoidable reasons, the 4 papers scheduled on 15 May in the Centres of Delhi have been rescheduled to 29 May 2024

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The National Testing Agency on Tuesday said the Common University Entrance Test (CUET)-UG 2024 scheduled for May 15 stands postponed for centres across Delhi due to unavoidable reasons. The exam in Delhi is going to be held on May 29.

Professor Mamidala Jagadesh Kumar spoke about the examination and said, due to unavoidable reasons, the 4 papers scheduled on 15 May in the Centres of Delhi have been rescheduled to 29 May 2024. He further added that the National Testing Agency has taken this decision in the best interest of the students. The revised admit cards will be issued. Exams have been cancelled in 258 centres in Delhi.

The announcement was made a few hours before the examination was scheduled to begin in 380 exam centers across India, including 26 outside India. The students and parents were disappointed as the cancellation of the examination was made at the last minute.

According to a public notice issued by the National Testing Agency, it is being informed to all the concerned candidates and stakeholders that due to unavoidable reasons, the test papers (Biology – 304, Chemistry -306, General Test – 501, English – 101) which had been scheduled on 15 May 2024 stand postponed for the candidates appearing in centres across Delhi only.

The notice further said that the examination scheduled for May 15 will be held in all other cities across the country, including in Gurugram, Ghaziabad, Noida, Faridabad and abroad. The National Testing Agency claimed that the reason behind this postponement is manpower issues caused due to the ongoing Lok Sabha elections. CUET UG is held at a large scale and NTA had selected many exam centres and invigilators are deployed for this process. However, they were facing issues in getting appropriate amount of invigilators in Delhi exam centres for the May 15 exam due to the ongoing Lok Sabha elections.

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Education

Agra school principal beats up teacher for coming late to school, video goes viral

The incident has reportedly taken place at a primary school in Seegana village of Agra. A complaint has been lodged at the Sikandra police station regarding the incident.

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A video of a school principal beating up a teacher that led to a fight between them is circulating on social media platforms across the internet. The incident took place at a primary school in Agra , when a video of the incident went viral. The incident has reportedly taken place at a primary school in Seegana village of Agra.

In the beginning of the video the principal can be seen reprimanding the teacher, Gunja Chaudhary, for arriving late to school, which led to a heated argument between them. Reacting to the incident, the primary school teacher claimed that the principal, too, had been arriving late for the past 4 days. This led to a verbal exchange between the two of them.

As tensions increased, the confrontation turned to physical which can be clearly seen in the video. Both the principal and the teacher were engaged in a heated argument and even resorted to the use of derogatory language and physical violence. Other staff members who were present at the scene tried to separate the two and stop the brawl but it seemed all efforts were in vain.

The physical fight ended with the primary school teacher tearing the principal’s clothes and she retaliated by pulling hair of the school teacher. This incident has resulted in injuries to the school teacher’s eye as well. The incident has led to widespread discussion and concern within different members of the education department. Many X users expressed shock and dismay at the behaviour exhibited both by the school teacher and the principal. According to reports a complaint has been lodged at the Sikandra police station regarding the incident.

The video of the incident has gone viral with 211400 views, 649 retweets and 1600 likes which are only increasing. Large number of X users commented on the viral video where one X user Arkabrata Das said he was glad that the teacher who got beaten was not male, otherwise the reason for beating would have changed.

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