myclass24
myclass24your class. your pace.
Q&A BANK

every question.
answered.

1,172 answers across CBSE, ICSE, and State boards — Class 1 to 12, every subject.

CBSEICSEState
SUBJECT
CLASS

Filtered results

1,172 TOTAL
ScienceClass 8CBSE

List the seven basic practices of crop production in their correct sequence.

The seven basic practices of crop production in their correct sequence are: 1. Preparation of Soil2. Sowing3. Adding Manure and Fertilizers4. Irrigation5. Protection from Weeds6. Harvesting7. Storage.

ScienceClass 8CBSE

What is the main difference between a 'godown' and a 'silo' for grain storage?

A 'godown' typically refers to a warehouse or a large shed used for storing grains in bags or sacks. They are usually rectangular structures and require manual labor for stacking and unstacking bags. 'Silos', on the other hand, are large, tall, cylindrical structures designed for bulk storage of grains. Grains are stored loose, not in bags, and are typically loaded and unloaded mechanically, making them more efficient for very large quantities and better protected from pests and moisture.

ScienceClass 8CBSE

Explain how a sprinkler system works and for what type of terrain it is most suitable.

A sprinkler system involves perpendicular pipes having rotating nozzles on top. These are joined to the main pipeline at regular intervals. When water is allowed to flow through the main pipe under pressure with the help of a pump, it escapes from the rotating nozzles and gets sprinkled on the crop as if it is raining. This system is most suitable for uneven land where sufficient water is not available, and for sandy soils.

ScienceClass 8CBSE

What is the primary purpose of preparing the soil before sowing seeds?A. To add nutrients to the soil.B. To loosen the soil, allowing for better root penetration.C. To remove all weeds from the field.D. To compact the soil for better water retention.

Ans. BLoosening the soil creates spaces for air and water, essential for healthy root growth. It also helps in mixing nutrients and improving drainage.

ScienceClass 8CBSE

Fill in the blanks to complete the following paragraph. The name of the product formed in the reaction of sulphur and is sulphur dioxide gas. When sulphur dioxide is dissolved in , sulphurous acid is formed. The sulphurous acid turns litmus paper to Generally oxides of are acidic in nature. After completing the paragraph write two questions which you can raise on the basis of this information.

The name of the product formed in the reaction of sulphur and Oxygenis sulphur dioxide gas. When sulphur dioxide is dissolved in water, sulphurous acid is formed. The sulphurous acid turns bluelitmus paper to red. Generally oxides of nonmetalsare acidic in nature. After completing the paragraph write two questions which you can raise on the basis of this information. When Sulphur reacts with oxygen which gas is produced? What happen when sulphur dioxide is dissolved in water ?

ScienceClass 8CBSE

Some of the following statements are incorrect. Find the incorrect statements and correct them. (a) The property of metals by virtue of which they can be drawn into wires is called ductility. (b) Metals are good conductor of electricity but poor conductor of heat. (c) Articles made of metals produce ringing sound when struck hard. (d) Oxides of non-metals and metals are acidic in nature. (e) A less reactive metal replaces a more reactive metal from its salt solution in water.

Statement b) d) and e) are wrong statements b) Metals are good conductors of electricity as well as Oxides of non-metals are acidic in nature and oxides of metals are basic in A more reactive metal replaces a less reactive metal from its salt solution in

ScienceClass 8CBSE

Match the substances in Column A with their applications given in Column B. Column A (Substance) Column B (Application) (a) oxygen (i) for making crackers (b) copper (ii) for disinfecting water (c) sulphur (iii) all living beings inhale during breathing (d) iron (iv) for making electric wires (e) chlorine (v) for making rails

Column A (Substance) Column B (Application) (a) oxygen (iii) all living beings inhale during breathing (b) copper (iv) for making electric wires (c) sulphur (i) for making crackers (d) iron (v) for making rails (e) chlorine (ii) for disinfecting water

ScienceClass 8CBSE

A doctor prescribed a tablet to a patient suffering from iron deficiency. The tablet does not look like iron. Explain

Tablets are made from salts of iron hence it does not look like iron.

ScienceClass 8CBSE

If in Fig. 4.1 iron nail is replaced by a wooden stick, will the bulb glow or not? Justify your answer

If iron nail is replaced by a wooden stick bulb will not glow as wood is a bad conductor of electricity.

ScienceClass 8CBSE

Paheli prepared a blue coloured solution of copper sulphate in beaker A and placed an iron nail in it. Boojho prepared a yellowish green solution of ferrous sulphate in beaker B and placed a copper wire in it. What changes will they observe in the two beakers after an hour?

In beaker A, a reddish brown layer of copper will deposit on the iron nail and the blue coloured solution will become yellowish green. On the other hand, no change is observed in beaker B.

ScienceClass 8CBSE

Paheli bought a statue made of copper. To her surprise it acquired a dull green coating after a couple of months. Explain the reason.

Green coating on copper statue is the mixture of CU(OH)2 and CUCO3 which are formed due to reaction of moisture and copper.

ScienceClass 8CBSE

Which of the following metals can displace the other two metals from their salt solutions?

Zinc

ScienceClass 8CBSE

Which liquid metal is used for making thermometers?

Mercury

ScienceClass 8CBSE

Why are bells made of metals?

Metals show sonorous property hence they are used in making bells.

ScienceClass 8CBSE

Zinc sulphate forms a colourless solution in water. Will you observe any colour on adding copper turning in it?

There will no change as displacement reaction will not take place.

ScienceClass 8CBSE

A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. Name the nonmetal.

Iodine

ScienceClass 8CBSE

Which non-metal is used to disinfect water?

Chlorine

ScienceClass 8CBSE

Name two major non-metals which are present in fertilisers and enhance the growth of plants.

nitrogen (ii) phosphorus

ScienceClass 8CBSE

Which non-metal is essential for our life and all living beings inhale it during breathing?

Oxygen

ScienceClass 8CBSE

Name two soft metals which can be cut with a knife.

sodium (ii) potassium

STILL STUCK?

Get a tutor for just your question.

One-on-one help, verified tutors. Matched within 24 hours.

Get Started →