Class 8 Science

CBSE Chapter 1 Crop Management Short Answer Questions

Question 1. Classify the following crops into Kharif and Rabi crops and write in the tabular column given below. Maize, paddy, mustard, pea, gram, wheat, groundnut

Answer: From the above given crop list, the Kharif and Rabi Crops can be grouped as

Question 2. The levelling of a ploughed field is beneficial. Give reasons to support your
Answer: The levelling of a ploughed field is beneficial for the following reasons

1. It helps in the uniform distribution of water in the fields during irrigation.
2. It also prevents loss of moisture from the ploughed soil.
3. It ensures ever germination and uniform growth of crops.

Question 3. Beera wants to practice crop rotation in his field. Suggest a Rabi crop and a Kharif crop that will replenish his field with nitrogen. Which crop replenishes nitrogen and why?
Answer: Rabi crops are pea and grain, while Kharif crops are soybean. These are grown in different seasons and therefore can very well be rotated alternately. Pea and soybean are leguminous plants that harbour bacteria, i.e., Rhizobium, in their root nodules.

These bacteria convert atmospheric nitrogen into a usable form for plants. These nitrogen-fixing plants can replenish nitrogen in the field, and hence, Beera can easily practice crop rotation.

Question 4. Leguminous plants do not require nitrogenous fertilisers. Why Is It so?
Answer: The planting of a leguminous crop in a field has the same effect as adding nitrogenous fertiliser in the field. They can fix atmospheric nitrogen themselves by using nitrogen-fixing bacteria in their root nodules. Therefore, nitrogenous fertilisers are not required for growing leguminous plants.

Question 5. State two advantages of using chemical fertilisers over manure. What would happen if fertilisers are used in excess?
Answer: Advantages of using chemical fertilisers over manure

Fertilisers are nutrient-specific and provide specific nutrients to the oil in the desired quantity.

These being readily soluble in water can he absorbed easily by the crop plants.

If it is used in excess, it causes tremendous changes in the chemical nature of the soil and makes it less fertile.

Question 6. Arrange the following boxes in proper order to make a flow chart of sugarcane crop production.

Answer: Flow chart for the crop production of sugarcane

Question 8. Explaining how to go to the continuous plantation of crops in the field.
Answer: Soil supplies mineral nutrients to the crop. These mineral nutrients are essential for the growth of plants. If crops are grown continuously in the same field for a long period, lie soil becomes poorer in nutrients. Titus, the soil gets deficient in nutrients, and the field becomes infertile.

CBSE Chapter 1 Crop Management Very Short Answer Questions

Question 1. Explaining the meaning of crop.
Answer: The same kind of plants grown and cultivated on a large scale in one place are called a crop.

Question 2. During which months do farmers grow mustard in India?
Answer: Farmers grow mustard from October to March. Mustard is a table crop that is sown at the beginning of winter (October-November), as it needs low temperatures, and harvested at the end of winter (April-May)

Read And Learn More CBSE Class 8 Science Very Short Questions And Answers

Question 3. Terms minted to agricultural practices are given below. Rom range them in the correct sequence. Harvesting, sowing, manuring, tilling, and ploughing, Irrigation, weeding
Answer: The correct sequence in the series of agricultural practices is Tilling and ploughing > sowing > planting> irrigation> weeding > harvesting.

Question 4. If you are given a dry piece of land for cultivation, what will you do before sowing the seeds?
Answer: Before sowing on a dry piece of land, it can be prepared to prepare the soil for cultivation, such as soil preparation, irrigation, leveling, and seedbed preparation.

Question 5. Which activity of the farmer can promote the growth of earthworms and microbes in the field?
Answer: Ploughing of the soil during soil preparation creates aeration and loosens the soil, which promotes the growth of earthworms and microbes and releases nutrients In the soil.

Question 6. Pick out the odd one from the following words given in the box and give a reason for it. Plough, Seed drill, Hoe, Chain pump, Sickle
Answer: The Seed drill is an odd pair in the above-given set of tools. It is a modern agricultural tool used to sow seeds at uniform distances and to properly cover them with soil.

Question 7. What are organic foods?
Answer: The crops (foods) that are cultivated using organic substances like manures are known as organic food. These products are grown and processed without the use of synthetic chemicals, including fertilisers, pesticides, weedicides, etc…

Question 8. Is the time and frequency of irrigation the same for rice and cotton?
Answer: No, the time and frequency of Irrigation Are not the same for rice and cotton. Klee requires more frequent mulching and continuous flooding, while cotton requires less frequent deep watering. The specific Irrigation practices may vary depending on the climate, soil, and the mid-growth stage of the crops

CBSE Class 8 Science Chapter 1 Crop Management Activity Ideas

Activity 1

Aim: To separate good and healthy seeds of wheat from the damaged ones.

Materials Required: Seeds of wheat, a beaker, and water. Procedure

1. Take a beaker and fill half of it with water.
2. Now, put some seeds of wheat in it and stir it well.
3. Let it rest for some time.

Observation After some time, we observe that most of the seeds will settle down, while some seeds will float on the top.

Conclusion: From this activity, we can conclude that the seeds that settle down at the bottom of the beaker are heavy and healthy. The seeds that float on the top of the water are spoiled. These seeds may be damaged due to disease or eaten by pests, causing them to turn hollow and lightweight, allowing them to float on water

CBSE Class 8 Science Chapter 1 Crop Management Practical Activities

Activity 2

Aim: To show the effect of manure and fertiliser on the growth of a plant (using germinated gram seedlings).

Materials Required: Pots, soil, cow dung manure, urea (chemical fertiliser), water, and germinated gram seedlings. Procedure

1. Take three pots and mark them A, I, and C.
2. In pot A, add some soil mixed with cow dung manure
3. In pot 13, add soil mixed with urea (chemical fertiliser).
4. In pot C, put some soil only.
5. Pour an equal amount of water into each pot and plant the seedlings of gram (already germinated).
6. Keep the pots in sunlight and water them daily, for 7-10 days

Observation: After 7-10 days, the growth of seedlings was observed. Plant in pot 13 shows maximum growth, followed by plant in pot A. Plant in pot C shows the least growth among the three.

Conclusion: From this activity, we can conclude that in the soil mixed with fertilisers, plants exhibit maximum growth. The fertilisers are more soluble in water and readily absorbed by plants as compared to manure. It also shows that manure and fertilisers are required for better growth of plants.

CBSE Chapter 1 Crop Management Fill In The Blanks

Question 1. The same kind of plants grown and cultivated on a large scale at a place is called
Answer: Crop

Question 2. The first stop before growing crops is the soil.
Answer:  Preparation

Question 3. Damaged seeds would
Answer: Float

Question 4. For growing a crop, sufficient sunlight, water, and water from the soil are essential.
Answer: Water, Nutrients

Question 5. Growing different crops alternately on the same land is called _________.
Answer: Crop rotation

Question 6. The main part of the plough is a long log of wood which is called a ___________.
Answer: Plough

Question 7. Tho crops grown in the rainy season are called
Answer: Kltarif crops

Question 8. Cotton cannot be grown in the……..season
Answer: Winter

Question 9. Poa belongs to the crops…..
Answer: Rabi

Question 10. Ploughing helps the roots to………deep in the soil.
Answer: Penetrate

Question 11……….It is a process to loosen the soil
Answer: Tilling

Chapter 1 Crop Management True/False

Question 1. Using good-quality seed is the only criterion to get a high yield.
Answer: False, apart from good quality seeds, using appropriate agricultural practices is also important for getting a higher yield

Question 2. All crop plants are sown as seeds in the field.
Answer: False, some crop plants need transplantation

Question 3. Growing different crops in different seasons in the same field will deplete the soil.
Answer: False, it enriches the soil

Question 4. Cells of root nodules of leguminous plants fix nitrogen.
Answer: False, Rhizobium (bacteria) present in the cells of root nodules of leguminous plants fix nitrogen

Question 5. Freshly harvested grains must be dried before storing
Answer: True

Question 8. Fertilisers are organic substances obtained from the decomposition of plant and animal wastes.
Answer: False

Question 9. Stubs burning in the fields cause air pollution.
Answer: True

Chapter 1 Crop Management Match The Columns

Question 1. Match the items in Column A with those in Column B.

Answer: (a)-(5), (b)-(4), (c)-(2), (d)-(3)

Question 2. Match Column 1 with Column 2.

Answer: 1. A-2.IM.C-l.D-3

Question 3. Match Column 1 with Column 2

Answer: 2. A-3, B-1.C-2.D-4

Question 4. Match Column 1 with Column 2.

Answer: A-2, B-5, C-l, D-3, E-4

Chapter 1 Crop Management Questions

Question 1. Boojho wants to know what tools like Khurpl, Shovol, and plough
Answer: We use tools like khurpl, s’ckle, shovel, plough, ete, in agricultural activities.

Question 2 Boojho wants to know, since we all need food, how li enn we provide food to a large number of people in our country?
Answer: Large-scale production of food is essential to meet the needs of a sizable population, ll requires regular production, proper management, and distribution of food

Question 3. One day, Pahell saw her mother put some gram seeds in a vessel and pour some water on them. After a few minutes, some seeds started to float on top. She wondered why some seeds floated on water.
Answer: Damaged seeds become hollow and thus lighter. Therefore, they float on top of water.

Question 4. Boojho saw a nursery near his school. He found that little plants were kept in small bags. He wants to know why.
Answer: Seeds of a few plants, such as paddy, are first grown in a nursery. When they grow into seedlings, they are transplanted to the field manually. Some forest plants and flowering plants are also grown in the nursery.

Question 5. Boojho went to a farm and saw a healthy crop growing there. Whereas in the neighbouring farm, the plants were weak. He asked Paheli why some plants grow better than others.
Answer: The plants with proper manuring and care grow better than others.

Question 6. Boojho asked the farmer if other plants were growing along with wheat. He wanted to know if they had been purposely grown.
Answer: No, these plants are not purposely grown. In a crop field, many other undesirable plants may grow naturally along with the crop. These undesirable plants are called weeds

Question 7. Boojho wants to know whether weedicides have any effect on the portion bundling through the weedicide sprayer?
Answer: Ym, spraying of weedicides may diet of furnicrit.

Question 8. One day, Pahell saw my mother putting some noom lonvos in nn Iron drum containing water. She wondered why.
Answer: Dried neem leaves are used for storing food grains at home. They protect the wheel from insects, pests, and fungal growth.

Chapter 1 Crop Management CBSE Board Crop Production

The following questions consist of two statements. Assertion and Reason (R). Answer the following questions by selecting the appropriate option given below

Crop Production and Management Important Questions

1. Both A and R are true, and R is the correct explanation of A
2. Both A and R are true, but R is not the correct explanation of A
3. A is true, but R is false
4. A is false, but R is true

1. Assertion: Paddy is a Rabi crop.
Reason (R) It requires a lot of water and is grown in the rainy season.

Answer: A is false, but R is true. A can be corrected as Paddy is a Kharif crop. It is sown in the rainy season as it requires a lot of water to grow

2. Assertion: Farmers add manure to the fields to replenish the soil with nutrients.
Reason (R) Continuous cultivation of crops makes the soil poor in nutrients.

Answer: Both A and R are true, and R is the correct explanation of A

3. Assertion: In a drip irrigation system, water is not wasted at all.
Reason (R) In a drip irrigation system, water escapes from rotating nozzles and gets sprinkled on the crop as if it is raining.

Answer: A is true, but R is false. R can be corrected as in a drip irrigation system, where water falls drop by drop directly near the roots. It is a boon in regions where the availability of water is poor

4. Assertion: Weeds should not be removed from fields.
Reason (R) They compete with the crop plants for water, nutrients, space, and light

Answer: A is false, but R is true. Can he correct Weeds, should he be removed from the fields because they compete with the crop plants for water, nuirleni. space and light. Thus, they affect the growth of the rice crop.

The following questions consist of two statements:

Assertion and Reason (R). Answer these questions by selecting the appropriate option given below.

1. Both A and R are true, and R is the correct explanation of A
2. Both A and R are true, but R is not the correct explanation of A
3. A is true, but R is false
4. A is false, but R is true

Question 1.

Assertion: Water plays an important role in crop production.
Reason (R) It protects the crop from both frost and hot air currents.

Answer: Both A and R are true, and R is the correct explanation of A

Question 2.

Assertion: Harvested grains should be protected from moisture.
Reason (R): Moisture prevents the growth of moulds.

Answer: A is true, but R is false

Common ailments like cold, influenza (flu), and most coughs are caused by viruses. Serious diseases like polio and chickenpox are also caused by viruses

CBSE Class 8 Science Chapter 2 Microorganisms: Friend And Foe Multiple Choice Questions

Question 1. The two microorganisms that live in symbiotic association in lichens are

1. Fungus And Protozoan
2. Algae And Bacteria
3. Bacteria And Protozoan
4. Algae And Fungi

Answer: 4. Algae And Fungi

Question 2. The gas released during the preparation of bread is

1. Oxygen
2. Nitrogen
3. Carbon Dioxide
4. Sulphur Dioxide

Answer: 2. Nitrogen

Question 3. Alcohol is produced with the help of 

1. Sodium Chloride
2. Yeast
3. Nitrogen
4. Carbon Dioxide

Answer: 2. Yeast

Question 4. Scientist who discovered fermentation?

1. Alexander Fleming
2. Louis Pasteur
3. Johann Mendel
4. Charles Darwin

Answer: 2. Louis Pasteur

Question 5. Pathogenic microorganisms present in host cells are killed by medicines called

1. Pain killer
2. Antibodies
3. Antibiotics
4. Vaccines

Answer: 3. Antibiotics

Question 6. Which of the elements is mixed with the feed of livestock and poultry to check microbial Infection In animals?

1. Vaccine
2. Antibiotic
3. Yeast
4. Alcohol

Answer: 2. Yeast

Question 7. Antibiotics are not effective against

1. Cold And Flu
2. Tuberculosis
3. Cholera
4. Typhoid

Answer: 1. Cold And Flu

Question 8. Edward Jenner discovered the vaccine for

1. Smallpox
2. Chicken Pox
3. Tuberculosis
4. Diphtheria

Answer: 1. Smallpox

Question 9. Polio drops given to children are a

1. Bacteria
2. Algae
3. Vaccine
4. Medicine

Answer: 3. Vaccine

Question 10. A female Anopheles mosquito carries the parasite of

1. Dengue
2. Cholera
3. Malaria
4. Tuberculosis

Answer: 2. Cholera

Question 11. Dengue fever is transmitted by

1. Female Aedes Mosquito
2. Housefly
3. Female Anopheles Mosquito
4. Sandfly

Answer: 1. Female Aedes Mosquito

Question 12. The disease caused by a protozoan and spread by an insect is

1. Dengue
2. Malaria
3. Polio
4. Measles

Answer: 2. Malaria

Question 13. An example of a bacterial disease occurring in animals is

1. Foot And Mouth Disease
2. Bird Flu
3. Anthrax
4. Swine Flu

Answer: 3. Anthrax

Question 14. Anthrax is caused by

1. Bacillus anthracis
2. Salmonella
3. Clostridium
4. Aspergillus

Answer: 1. Bacillus anthracis

CBSE Class 8 Microorganisms Friend And Foe MCQ With Answers

Question 15. Citrus canker is a common disease of

1. Human
2. Plant
3. Animal
4. Fungi

Answer: 2. Plant

Question 16. Payal dug two pits, A and Bin her garden. In pit A, she put a polythene bag packet with some agricultural waste. In pit B, she dumped the same kind of waste, but without packingit in a polythene bag. She then covered both the pits with soil. What did she observe after a month?

1. Waste in pit A degraded faster than that in pit B
2. Waste in pit B degraded faster than that in pit A
3. Waste in both pits degraded almost equally
4. Waste in both pits did not degrade at all

Answer: 2. Waste in pit B degraded faster than that in pit A

CBSE Class 8 Science Chapter 2 Microorganisms: Friend And Foe Long Answer Questions

Question 1. A trash can contains the following materials. Plastic straw, Aluminium foil, Tissue paper, Glass bottles, Chicken bones.

1. Select the materials from the list that can be decomposed by microbes.

Answer: Tissue paper, Chicken bones.

2. Rohit is suffering from a stomach ache and is passing watery stools. What should Rohit do to prevent the spread of infection to other family members?

1. He should eat properly cooked food
2. He should wear a mask all the time
3. He should maintain a distance from other family members
4. He should wash his hands with soap after using the bathroom

Answer: 4. He should wash his hands with soap after using the bathroom.

Microorganisms: Friend And Foe Class 8 LAQS with Answers

Question 2. Suman wants to see how quickly carrots lose colour. Loss of colour shows rotting of the carrot. She observes carrot slices on a plate under three different conditions, as shown below

She notes how long the carrot slices on each plate take to change colour

1. What can Suman conclude from her activity?
2. Carrots, when kept under the Sun, do not rot easily.
3. Carrots at room temperature lose colour more quickly.
4. Carrots can be best preserved in hot and moist conditions.
5. Carrots take more time to lose colour under cold conditions.

Answer:

1. Carrots take more time to lose colour under cold conditions.
2. Use the results of the activity to finish the graph below. The first bar is drawn for you. Put a label in the space provided for the axis on the left.

Answer:

Question 3. The picture shows the nitrogen cycle

1. How do plants take up nitrogen?
Answer: Plants take up nitrogen from the nitrogenous compounds in the soil.

2. Plants and animals are continuously using nitrogen. Will there be a depletion of nitrogen in the environment due to this continuous use? Explain your answer.
Answer: No, nitrogen in the environment will not get depleted because it is recycled and reused in the environment.

Question 3. Give the causative microorganism, mode of transmission, and one preventive measure of human diseases like Polio, Cholera, and Hepatitis B.
Answer: 

CBSE Class 8 Science Chapter 2 Short Answer Questions

Question 1. Why should we avoid standing close to a tuberculosis patient while he or she is coughing?
Answer: Tuberculosis is an airborne disease that easily spreads when the infected person coughs, as coughing spreads germs in the air. This bacterium can be inhaled by a healthy person nearby and cause infection. This is why we should avoid standing close to a TB patient.

Question 2. Classify the following into friendly and harmful microorganisms.
Yeast, malarial parasite, Lactobacillus, bread mould, Rhizobium, Bacillus anthracis.
Answer: 

Question 3. While returning from school, Boojho ate chaat from a street hawker. When he reached home, he fell ill and complained of a stomachache. What could be the reason?
Answer: The reason could be that the chaat was contaminated by pathogenic microorganisms. It can be due to unhygienic conditions near the shop, or the utensil used for serving could have been contaminated.

The unhygienic environment of the shop attracts flies and promotes the growth of infections. Most street hawkers sell food items in an open area, which gets contaminated with dust and flies carrying germs. This unhygienic condition can lead to the spoilage of food, which, when consumed, can lead to serious illness.

Question 4. What will happen to ‘poorls’ and ‘unused kneaded flour’ if they are left in the open for a day or two?
Answer: The ‘unused kneaded flour’, if left in warm conditions, gets infected by microbes which cause fermentation and spoil the flour. The pooris, on the other hand, would remain in relatively good condition because these were deep-fried in heated oil that kills microbes.

Explain how Lactobacillus is useful In Making Curd, Class 8 CBSE

Question 5. Sachin opened two packets of Milo drink. He left one in the refrigerator and another on the table. Three days later, he got a bad smell from the packet left on the table. The packet of Milo drink in the refrigerator did not have a bad smell. Why? Explain.
Answer: The packet, which was put in the refrigerator, did not have a bad smell because there was a cold temperature, and bacteria could not grow there. The Milo drink left outside the refrigerator smelled bad because it came in contact with air and bacteria. The higher temperature outside the refrigerator proved favourable for the growth of microorganisms.

CBSE Class 8 Science Chapter 2 Microorganisms: Friend And Foe Very Short Answer Questions

Question 1. Write the name of the device by which we can study microorganisms successfully.
Answer: A Microscope is the device that has made the study of microorganisms successful.

Question 2. Ashish left an orange in his bag and forgot about it. After a week, when he looked in his bag, he found something growing on his orange.

Read And Learn More CBSE Class 8 Science Very Short Questions And Answers

Question 3. What was growing on Ashish’s orange?
Answer: Mould

Question 4. Can these organisms be seen with a magnifying glass?
Answer: Yes, Fungi can be seen with a magnifying glass.

Question 5. Identify a protozoan from the list of microorganisms given: Rhizopus, Rhizobium, Penicillium, and Amoeba.
Answer: Amoeba is a protozoan in the list given.

Question 6. Name the group of microorganisms that can photosynthesise.
Answer: Algae are a group of microorganisms that can photosynthesise.

Question 7. Mention the kind of organisms that are classified under algae. Give examples.
Answer: Simple plant-like organisms that contain chlorophyll are classified under algae. Example: Spirogyra, Chlamydomonas.

Question 8. Mention a characteristic of viruses.
Answer: Viruses are cellular, tiny, microscopic organisms that can reproduce only inside the cells of host organisms.

Question 9. Write the names of two groups of microorganisms that live in colonies.
Answer: The groups of microorganisms that live in colonies are bacteria and fungi.

CBSE Class 8 Science Chapter 2 Microorganisms, Friend And Foe Activity Ideas Activity 1

Aim: To show the presence of microorganisms in soil and pond water.

Materials Required: Soil, water, two beakers, pond water, microscope, dropper, and slide.

Procedure

1. Collect some moist soil from the field in a beaker A and add water to it.
2. Take another beaker, B, and pour some pond water into it.
3. After the soil particles have settled down, put a drop of water from the beaker A with the help ofdropper on a slide and observe under a microscope.
4. Similarly, take a few drops of water from beaker B with the help ofdropper, spread them on a glass slide and observe through a microscope.

Observation: We will observe tiny organisms moving around in both slides.

Conclusion: From this activity, we can conclude that soil and pond water contain many microorganisms.

CBSE Class 8 Science Chapter 2 Microorganisms Activity For Better Understanding Activity 2

Aim: To show the effect of yeast on dough.

Materials Required: 1/2 kg Flour (atta or maida), sugar, warm water, yeast powder, and a lid.

Procedure:

1. Take 1/2 kg flour (atta or maida), add some sugar, and mix with warm water.
2. Add a small amount of yeast powder and knead to make a soft dough.
3. Cover the dough and keep it aside for two hours.

Observation: We will observe that the dough has risen and its volume has increased

Conclusion: From this activity, we can conclude that yeast reproduces rapidly and produces carbon dioxide during respiration. Bubbles of the gas fill the dough and increase its volume.

Class 8 Science Chapter 2 Microorganisms: Friend And Foe Activity 3

Aim: To carry out the fermentation of sugar.

Materials Required: Beaker, water, sugar, yeast powder, lid, and spoon.

Procedure

1. Take a 500 mL beaker filled upto 3/4 with water.
2. Dissolve 2-3 teaspoons of sugar in it.
3. Add half a spoonful of yeast powder to the sugar solution.
4. Keep it covered with a lid in a warm place for 4-5 hours.
5. Smell the solution.

Observation: We will observe a pungent smell

Conclusion: From this activity, we can conclude that sugar has been converted into alcohol by yeast. This process of conversion of sugar into alcohol is known as fermentation.

CBSE Class 8 Science Chapter 2 Microorganisms Activity With Materials List Activity 4

Aim: To show that microorganisms decompose plant waste.

Materials Required: Pot A and B, soil, plant waste, polythene bag, empty glass bottles, and broken plastic toys.

Procedure:

1. Take two pots and fill each pot half with soil, and mark them A and B.
2. Put plant waste in pot A
3. Put polythene bags, empty glass bottles, and broken plastic toys in pot B.
4. Put both pots aside. Observe them after 3-4 weeks.

Observation: We will observe that the contents of pot A would be converted into manure by the action of the microbes present in the soil. However, there would be no change in the contents of pot B, as microorganisms could not act on the materials present in it

Conclusion: From this activity, we can conclude that microorganisms decompose plant waste and convert it into manure, but they do not act on inorganic substances like polythene bags, plastic toys, etc.

CBSE Class 8 Science Chapter 12 Some Natural Phenomena Multiple Choice Questions

Question 1. We see lightning first than sound because

1. Sound travels farther than light
2. Light travels faster than sound
3. Light travels In vacuum but sound dose not
4. None of the above

Answer: 2. Light travels faster than sound

Question 2. The magnitude or Intensity of an earthquake can be measured by

1. Electroscope
2. Richlor scale
3. Both 1 and 2
4. None of those

Answer: 2. Richlor scale

Question 3. The continuous motion of the plates inside Earth’s crust causes

1. Cyclone
2. Rain
3. Earthquake
4. Thunderstorm

Answer: 3. Earthquake

Question 4. The innermost layer of Earth is called

1. Crust
2. Mantle
3. Core
4. None of these

Answer: 3. Core

Question 5. Lightning occurs due to

1. Rain
2. Wind
3. Electric discharge
4. None of these

Answer: 3. Electric discharge

Question 6. Sparks can be seen on the electric poles, due to which the wire becomes

1. Loose
2. Tight
3. Wrinkle
4. None Of These

Answer: 1. Loose

Question 7. The like charges

1. Repel Each Other
2. Attract Each Other
3. No Interaction Takes Place
4. All Of The Above

Answer: 1. Repel Each Other

Question 8. The charge acquired by the glass rod when it is rubbed with a silk is

1. Positive
2. Negative
3. Both 1 and 2
4. None of these

Answer: 1. Positive

Question 9. Two charged objects are brought close to each other. Choose the most appropriate statement from the following options.

1. They may attract.
2. They may repel.
3. They may attract or repel depending on the type of charges they carry.
4. There will be no effect.

Answer: 3. They may attract or repel depending on the type of charges they carry.

Question 10. Which of the following can be charged with static electricity?

1. Alloy
2. Metal
3. Insulator
4. Semiconductor

Answer: 3. Insulator

Question 11. Electric current is to be passed from one body to another. For this purpose, the two bodies must be joined by

1. Cotton Thread
2. Plastic String
3. Copper Wire
4. Rubber Band

Answer: 3. Copper Wire

Question 12. Consider the list of terms given below

1. Tsunami
2. Landdslide
3. Flood
4. Lightning

Question 13. Earthquakes can cause

1. 1, 2, and 3
2. 2 and 5
3. 2, 3, and 4
4. 3 and 4

Answer: 1 1, 2, and 3