CBSE Class 9 Science Value Based Questions Set B

Chapter – 3 ATOMS AND MOLECULES

Question. An old man and a scientist were talking about a deserted house. The old man was sure that it was haunted by ghosts, but the scientist discarded the view saying no one had ever seen a ghost. The old man was annoyed and challenged the scientist about existence of atoms, sub-atomic particles which also could not be seen. 

· Name the three sub-atomic particles and their discoverers.

· Whose viewpoint do you support and why?

Question. An activity was conducted in a classroom where students held placards with symbols and valency of the elements separately. Each student held two placards, one with the symbol in the right hand and other with the valency in the left hand.

· Which placards will be required for formation of sodium chloride ( both symbol as well as valency).

· Which qualities are required in the student to perform such a group activity?

Question. Two class IX students, Kaveri and Nalin, were asked to take 5.3 g of sodium carbonate and 6g of ethanoic acid to make 2.2g of carbon dioxide, 0.9g of water and 8.2 g of sodium ethanoate. Kaveri followed the instructions but Nalin took the chemicals without measuring their amounts.

· Whose activity do you think will be in agreement with the law of ``Conservation of mass''?

· State the law of ``Conservation of mass''.

· Whose method do you like and why?

Question. Raghu and Vansh were performing an activity related to conservation of mass in chemistry lab of their school. They mixed a solution of barium chloride and sodium sulphate. Raghu suggested that as they already knew the amount of both compounds taken by them, they need not to measure the amount of final solution. On the contrary, Vansh insisted to measure the amount of final solution, which had barium sulphate and sodium chloride. Atomic mass of ions: Ba 2+ = 137 units, Cl - = 35.5 units, Na + = 23 units, S2 - = 32units, O2 - = 16 units.

· Determine the molecular mass of

   a) Barium chloride

   b) Barium sulphate

   c) Sodium sulphate

   d) Sodium chloride

· Comment on Vansh's Insistence to complete the activity.

· Determine the molecular mass of

a) Barium chloride

b) Barium sulphate

c) Sodium sulphate

d) Sodium chloride

· Comment on Vansh's Insistence to complete the activity.

Chapter – 4 STRUCTURE OF ATOM

Question. Beenu was quite confused when she was taught mole concept in the class. Same evening she went to the market with her mother to buy fruits. Her mother bought one dozen apples, one dozen oranges and one dozen (one dozen=12 piece.) banana , fruits-seller gave the fruit according to their mass in kg. on observing their respective masses, beenu understood the mole concept instantly.

· Can you explain what made Beenu understand mole-concept?

· What is Avogadro's constant.

Question. Ayush is not keeping happy and is unable to focus on studies. His friend Udghosh observed the same and inquired Ayush. Udghosh was told by Ayush that his younger brother is not keeping good health. His neck has swollen. The fact that Ayush's family was not including iodized salt in their diet came to light. Udghosh immediately suggested certain measures and insisted that Ayush's brother must see the doctor without any delay.

· What values are displayed by Udghosh?

· What can be possibly the disease from which Ayush's brother is suffering?

· Name the element whose isotope is used in the treatment for the disease.

Chapter – 7 DIVERSITY IN LIVING ORGANISMS

Question. During a field-trip some students visited an agricultural farm and saw a few birds eating earthworms. They enjoyed the scene and then they also started picking and killing the earthworms for pleasure. The farmer strongly objected and asked them to leave the field.

· What could be the reason behind such a behavior of the farmer?

· What values do you find missing in the student's behavior?

· Which phylum do earthworm belong to?

· Write two identifying features of earthworm.

Question. Anshul is having a beautiful pet dog 'Ginger'. One day, he observed a small insect between his toes. He removed it carefully from the toe and observed it curiously as chapter titled 'Diversity In Living Organisms' was being taught in the school.

· Identify the phylum to which the insect belong to.

· Enlist any two characteristic features of this phylum.

· Comment on Anshul's behavior.

Question. Rahul and his mother were walking in the garden. Rahul saw mushrooms Growing on decaying leaves. He tried to uproot them. He was stopped by his mother.

· Identify the kingdom to which the organism belongs to.

· Write the mode of nutrition exhibited by the mushrooms.

· Why did Rahul's mother stopped him?

Question. Ayush was playing cricket in the ground with his friends. One of his friend who was standing near the boundary felt something climbing upon his feet. Subsequently he started crying in pain. Ayush being class nine student identified the climbing creature as leech and helped removing the leech.

· Name the phylum to which leech belongs.

· Write two identifying features of the phylum.

· Enlist two values shown by Ayush.

Question. A group of children were playing on a heap of sand. One of them collected some shelled creatures from the sand. Being taught lesson on diversity in School, one of them identified them as snail. 

· Name the phylum to which snail belongs.

· Write two characteristic features of the phylum.

· What positive attitude towards learning is shown by the students?

Question. Radhey was suffering from respiratory disorder since long time. His daughter Sarita took him to a doctor. After studying his case, the doctor came to know that Radhey was residing near a very busy road.

· What could be the possible reason for Radhey's respiratory disorder?

· Which major pollutants are present in exhaust of vehicles?

· Write the preventive measures that should be taken.

Question. In a school assembly, the students were asked to wear full sleeves shirts,full pants and socks pulled till knees, use mosquitoes repellants cream during day time.

· Name the disease, about which preventive instruction are given in the assembly.

· Name the vector of this disease.

· Give two preventive environmental measures.

· Which two values were given in assembly related to society?

Chapter – 10 GRAVITATION

Question. While passing nearby a pond, some students saw a drowning man screaming for help. They alerted another passerby, who immediately threw an inflated rubber tube in the pond. The man was saved.

· Why the passerby did use inflated rubber tube to save the drowning man?

· Write the principle involved here.

· Which qualities shown by the students and the passerby do you identify that helped in saving the drowning man?

Question. You received an e-mail from a friend living in a coastal town. He shared an experience with you that recently, while swimming on the coastline of the sea in common swimming attire, he thought of going deeper inside the sea. He was asked to abstain from delving deeper into the sea by the rescue personnel. Respond to the following questions using the information provided above

· Why the rescue personnel asked your friend not to swim deeper inside the sea?

· What values were exhibited by the rescue personnel?

Question. Nitya is visiting her relatives in Bhopal. One day her aunt expressed unhappiness with the milk supplied by the milkman. She complained of adulterated milk. Nitya asked her to buy an instrument to check the purity of milk. Next day, the supplied milk was tested and found water being mixed in the milk. Nitya's aunt informed all her neighbors about the instrument.

· What values are shown by Nitya, her aunt and the milkman respectively?

· Identify the instrument and the principle on which it is based?

Question. During the summer vacations, Gaurav visited his native village. He observed that for washing clothes, villagers used the water from the well. Out of curiosity he drew water from the well and observed that the bucket of water appeared to be heavier as it came out of the water.

· Name the principle used in the above passage.

· Why bucket appears to be heavier in air?

· Which values are reflected in Gaurav's behavior.

Chapter – 11 WORK AND ENERGY

Question. An educational tour to Mumbai was organized. While visiting the seashore, Vyom, one of the students observed that direction of wind changed during the day time and night. He asked his science teacher who accompanied them, the possible reasons for his observations.

· What possible reasons, teacher gave to the student.

· Name two other factors which influence winds.

· Comment on the values shown by the student.

Question. Due to heavy rains and speedy winds a tree broke and fell on the road. Two persons from local shops came and begin to remove that broken part of the tree, but in vain as the log was too heavy. A passerby came to their help with a few solid heavy sticks. Consequently, the heavy log was put aside and the commutation on the road began as usual.

· Comment upon the value(s) displayed by the passerby?

· Name the energy stored when the heavy log of the tree was lifted to some height?

Question. Mr. Shah's family was worried about heavy electricity bills to be paid. Their neighbour Mr. Sen suggested some easy and effective steps to reduce the same. Next month's bill came as a relief to Mr. Shah, as the consumption of electricity had reduced by 50 units and so had the bill.

· What is the unit of ``Power''.

· What is it a measure of energy or power?

· Write any three steps that you think Mr. Sen might have suggested to Mr. Shah.

Question. Amit and Nitin were observing a building having two different staircase. One slanting and other vertically spiral. Amit was of the opinion that a person using slanting staircase will be doing more work against gravity but Nitin thought otherwise. They started quarrelling. Asif, their friend, explained and gave entirely different view and pacified them.

· What according to you was the explanation given by Asif?

· What appreciable values do you see in the Asif?

Question. Four tubelights of 60 watt each, three fans of 60 watt each and a geyser of 500 watt operates for eight hours everyday in a household. The electricity bill made Mr. Abhinav worried. He discovered the usage of geyser, unnecessary longer. He conveyed to the family members that energy guzzling appliances and gadgets ought to be wisely used according to the need.

(hint:- 1watt = 0.001 kilowatt = 1 unit)

· Calculate the total electrical units of energy consumed if the month is September.

· Comment upon the values demonstrated by Mr. Abhinav.

· Convert 1 kilowatt hour into joules.

Question. Aditya and his friends were playing with a catapult (gulel) in his garden. Several mangoes were dislodged and fell with the help of catapult. One of his friend was aiming the catapult on a bird. Aditya prevented him from doing so.

· Name the energy possessed by the stretched string of the catapult.

· What will happen if the stone is thrown without stretching the string of a catapult?

· Why Aditya did prevent his friend from aiming at the bird?

Which quality is highlighted in Aditya's behavior?

Question. Raghu lives in a village and his school is 8 km away from his home. His father suggests buying a motor cycle to go to school. Raghu opposes the idea and opt for a bicycle instead.

. Write the energy transformation taking place while Raghu rides his bicycle.

· If Raghu paddles the bicycle with a speed of 8 Km/hr and he wants to Reach 10 minutes before the school commences. What should be the duration before which he must leave his house?

· Justify the stand taken by Raghu in your own words.

Chapter 12 SOUND

Question. In a hot summer afternoon a man was shouting through a megaphone. He was 'zip-repairer'. As Arshi was preparing for her examination, she got disturbed. She inquired her father about the instrument being used by the 'zip-repairer'. The father told her that it was a megaphone also known as 'loud hailer'.

· State the principle on which the megaphone works.

· Why did Arshi get disturbed?

· Why megaphones should not be used in residential area?

Question. Kunal and Abhimanyu were waiting to go across a railway crossing. Kunal jumped over the barrier and curiously put his ear on the railway track. Abhimanyu opposed Kunal and pulled him away from the railway track.

· Why did Kunal put his ear on the railway track?

· Can sound travel faster through, (i). Copper (ii). Water.

· Why did Abhimanyu pulled Kunal away from the railway track?

Question. Revantashish had a pain in his ear as he pricked it with a pin. The doctor advised we should take proper care of our ears and protect them from damage.

· Why we must not prick with hard and pointed things inside our ears?

· What is the function of ear?

Question. Reena's grandmother took her mother to a doctor as she was four months pregnant for ultra-sonography. But she showed her interest in determining whether the child is a boy or a girl. The doctor was annoyed and refused to disclose the gender of the child.

· What is ultra-sonography?

· On what principle does it work?

· Why do you think the doctor refused to determine the gender of the child?

· Why is ultrasonography important?

Question. Harsha was watching a program based on ships on television. She saw a device attached to a ship through which the men on the ship located the enemy submarines and sent the message to the headquarters.

· Name the device fitted in the ship.

· Write the full form of the device.

· On which principle does the device work?

· Write other uses of the device.

Chapter – 13 WHY DO WE FALL ILL

Question. Two HIV- infected siblings Anu and Nikhil were expelled from their school. Only after the intervention of a NGO, they were readmitted.

· Which disease are the two children suffering from?

· Write any three modes of transmission of this disease.

· What is your viewpoint about both the steps taken by the school as well as the

Question. Akshita came to school one day with running nose, reddish and watery eyes and coughed often. She met Sanchita in the morning assembly who adviced her to sit on a separate desk in the classroom till she recovers

· Name the disease from which Akshita is suffering from?

· Name the causal organism.

· Enlist any two preventive measures.

· What is your view point on the sanchita'a advice?

Question. Shreyas's gardener was coughing continuously since last few days and was running low grade fever. He was taking home made remedial treatment. One day Shreyas's physician visited their home. Shreyas got his gardener checked. The gardener was advised to get his chest X-rayed and sputum tested in the neighboring Infectious Disease Hospital.

· Name the disease he might be suffering from?

· Name the causative organism?

· Give two preventive measures of the disease.

· Which two values were shown by Shreyas?

Question. Rahul and Anil are two close friends who spent much of their time together. Rahul observed that Anil is behaving differently since last week. He gets tired and sits on the bench after playing for 5 -10 minutes. Rahul inquired Anil if he was not feeling well. Anil just looked at Rahul with his pale eyes and complained of nausea and vomiting. Rahul advised him to visit the doctor.

· Symptoms of which disease are reflected in Anil's situation.

· Which causative organism is responsible for it?

· Which values are reflected in Rahul?

Question. Megha, a class IX student was asked to submit a project report on mosquito transmited diseases in school. She visited a nearby hospital where her aunt was staffed as a nurse. Her aunt took her to a patient suffering from malaria. Megha talked to the patient and asked him about symptoms.

· Name the causative organism and the vector of the disease.

· Name the two other symptoms which may have been told by the patient.

· Identify two important values as shown by Megha.

Question. Kushal's family is happy as he became a proud father to a baby girl. Upon a routine visit to the hospital, the doctor advised him not to skip the vaccination schedule. While discussing the same at home, one of the family members suggested that vaccination is not necessary for girl child. Kushal opposed this suggestion.

· What is vaccination?

· Name any two common vaccines and their associated disease.

· Critically comment upon Kushal's viewpoint.

Question. Kriti and Kaustubh are discussing on vaccination. Kaustubh during the discussion,submitted his fear that the inoculated vaccination can be dangerous because it contains dead germs. Kriti explained and removed his fears.

· What could be Kriti's explanation?

· What values do you think Kriti possess?

Question. Rahul, an engineering student, is from an affluent family and is physically active. But to support his lavish lifestyle, he starts stealing mobile phones and laptops of his classmates. He was caught and counselled by his teachers to stop such a behavior.

· Do you think Rahul is healthy or disease-free? Substantiate your answer.

· Define health.

Question. Manu's younger sister is two years old. His father was supposed to take her to 'Pulse Polio' center on a Sunday. But he was not interested as he was watching a live telecast of the final match played between the cricket teams of India and Pakistan. Manu insisted on their visit to the 'Pulse Polio' center.

· What is Pulse-Polio?

· Which is the causative organism of polio?

· Why do you think it was necessary to take Manu's sister to the center?

Question. Although Archana had been suffering from cold and cough, yet she decided to appear for her unit test. Anita seated next to her was not affected but Pooja seating behind contracted the infection.

· What prevented Anita catching cold and cough in spite of her exposure to the infection.

· Which type of disease, she was suffering from.

· Name two preventive measures against above type of disease.

· Express your opinion, whether Archana was right in her decision of coming to school.

Question. Parineeti was down with an attack of bronchitis. The atmosphere was full of smoke and noise as diwali was nearing when her parents explained to the ill effects of burning crackers to neighbourhood kids. They agreed not to burn crackers anymore.

· It is observed that when a cracker is burnt its light reaches us first and then we hear its sound. Why?

· Write any three ill-effects that Parineeti' parents might have explained to kids.

· Do you support kid's decision of not burning crackers, which qualities do you identify in those kids.

Chapter – 14 NATURAL RESOURCES

Question. Water covers 75% of the earth's surface. It is also found underground. Still, in every summer, most of the places have to face a shortage of water.

· Critically comment.

Question. Ram Avatar is a farmer residing on the outskirts of Delhi. Upon a visit to a fertilizer shop, the salesmen inquired of Ram Avatar of the crop he anticipated to cultivate in the coming season. During the conversation, the crop concerned was conveyed. The salesman suggested that urea and other nitrogenous fertilizer be used. Shreshth, quietly but keenly listening the conversation intervened and told Ram Avatar that for the concerned crop nitrogenous fertilizers shall not be required. Respond to the following questions using the information provided above:

· What values are shown by Shreshth?

· What can be the concerned crop possibly?

· What can be the reason for Shreshth's suggestion?

Question. A priest of temple collected dried garlands, holy old books and some statues. He asked his son to throw in the river. But instead of throwing, he buried them in the soil. · In the situation above, who wins your support: the priest or the son? Justify your answer by giving two reasons.

· What are the values reflected in the behavior of son?

Question. Mr Rajinder has this unique habit of planting saplings wherever he can in his neighborhood area to stop soil erosion. Due to his constant efforts, once barren and unused land of village Rampur has got changed into green plantation.

· What is soil erosion?

· What are agents that cause soil erosion?

· What are the methods of reducing and preventing soil erosion?

· Which characteristics do you find in Mr Rajinder that can be emulated?

Question. A gardener was seen burning dry leaves in the garden daily by a bunch of school kids. The kids went to him and advised not to burn those leaves and told about this practice's ill effects.

· What ill-effects were the kids talking of?

· What do you suggest the gardener to do with the leaves instead of burning?

· Write any two values shown by the kids.

Question. The Resident Welfare Association of an area refused the proposal of installation of a mobile tower in their complex.

· Co-relate the refusal with the environment and extinction of house sparrow.

· Comment upon the values shown by RWA.

Question. Nistha and parents had to postpone their trip to Indonesia because of cancellation of all flights to the country last November. She found out the reason to be persistent 'SMOG' in the country.

· What is smog?

· How does it affect human beings?

· What could be your/Nistha's contribution as an individual towards controlling such a situation.

Question. A news item, telling about mysterious disease affecting people of nearby village, inspired Karan to find out the cause behind it. On investigation, he discovered that the only source of water for the village is a small river on whose banks three paper factories are situated. Karan along with villagers made efforts and got those factories closed.

· Addition of which undesirable substance might have caused the disease?

· What is water pollution?

· Do you identify with the cause Karan fought for?

Question. The menace of air pollution has proliferated the harmful effects on environment. Ferozpur majra is a village through which an arterial national highway passes through with an incessant traffic. Kapil observed that his father's worry over the years has increased whenever the first rain of the season pours down, as he had observed that the first rain affects the animals and plants adversely. Kapil understood the reason and explained the phenomenon to his father.

· Name the phenomenon which kapil explained to his father.

· What is the reason behind the occurrence of this phenomenon.

· Name any two harmful gases which cause this phenomenon.

· Give any two suggestions to reduce the ill-effects of this phenomenon.

Question. Raghu switched from traditional to modern farming practices in which he used large amounts of fertilizers and pesticides to gain an increase in profit.

· What are the adverse effects of modern farming?

· What is soil pollution?

· What do you think will be effect on the soil in long run?

. What alternative method could be more beneficial for farming?

ANSWER

Please refer to the link below for CBSE Class 9 Science VBQs