Sorting Materials Into Groups

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| By Bhavani Mahendran

Bhavani Mahendran

Community Contributor

Quizzes Created: 1 | Total Attempts: 1,335

Questions: 10 | Attempts: 1,343 | Updated: Jan 27, 2023

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Questions and Answers

1.

An iron nail is kept in each of the following liquids. In which case would it lose its shine and appear dull?
- A.
  
  (a) Mustard oil
- B.
  
  (b) Soft drink
- C.
  
  (c) Coconut oil
- D.
  
  (d) Kerosene
Correct Answer
B. (b) Soft drink

Explanation
Soft drinks contain carbonic acid, which can react with the iron in the nail and cause it to lose its shine and appear dull. This reaction is known as corrosion. Mustard oil, coconut oil, and kerosene do not contain any acidic components that can react with the iron, so the nail would not lose its shine in those liquids.

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2.

Soft substances are easy to scratch
- A.
  
  True
- B.
  
  False
Correct Answer
A. True

Explanation
Soft substances are easy to scratch because they have a lower hardness compared to harder substances. When an object with a higher hardness comes into contact with a soft substance, it can easily leave marks or scratches on its surface. The softness of the material allows it to deform or be displaced more easily, making it susceptible to scratching.

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3.

While doing an activity in class, the teacher asked Paheli to handover a transluscent material. Which among the following materials will Paheli pick and give her teacher?
- A.
  
  (a) Glass tumbler
- B.
  
  (b) Mirror
- C.
  
  (c) Muslin cloth
- D.
  
  (d) Aluminium foil
Correct Answer
C. (c) Muslin cloth

Explanation
Muslin cloth is the correct answer because it is a translucent material. Translucent materials allow some light to pass through them, but they scatter the light, making objects on the other side appear blurry or diffuse. Muslin cloth is a thin, loosely woven fabric that allows some light to pass through it, but it is not completely transparent like glass or mirror. Aluminium foil is opaque and does not allow any light to pass through it. Therefore, muslin cloth is the most suitable choice for a translucent material.

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4.

Mirror is a/an_____________kind of substance (Opaque/Transparent)

Correct Answer
Opaque

Explanation
Mirror is considered an opaque substance because it does not allow light to pass through it. Instead, it reflects light, creating a clear and distinct image. Opaque substances do not transmit light and therefore do not allow objects to be seen through them.

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5.

Boojho found a bag containing the following materials (i) Mirror (ii) Paper stained with oil (iii) Magnet (iv) Glass spectacles Help Boojho in finding out the material(s) which is/are opaque.
- A.
  
  (a) (i) only
- B.
  
  (b) (iv) only
- C.
  
  (c) (i) and (iii)
- D.
  
  (d) (ii) and (iv)
Correct Answer
C. (c) (i) and (iii)

Explanation
The materials that are opaque do not allow light to pass through them. In this case, the mirror and the magnet are the opaque materials, as they do not allow light to pass through them. The paper stained with oil and the glass spectacles are not opaque, as they allow some light to pass through them. Therefore, the correct answer is (c) (i) and (iii).

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6.

Which pair of substances among the following would float in a tumbler half filled with water?(one or more correct options are right)
- A.
  
  (a) Cotton thread, thermocol
- B.
  
  (b) Feather, thread
- C.
  
  (c) Pin, oil drops
- D.
  
  (d) Rubber band, coin
Correct Answer(s)
A. (a) Cotton thread, thermocol
B. (b) Feather, thread

Explanation
Cotton thread and thermocol would float in a tumbler half filled with water because both substances have a lower density than water. Feather and thread would also float for the same reason. However, pin and oil drops would sink in water because they have a higher density than water. Similarly, a rubber band and a coin would sink in water because they are denser than water.

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7.

Which of the following statements is not true?
- A.
  
  (a) Materials are grouped for convenience.
- B.
  
  (b) Materials are grouped to study their properties.
- C.
  
  (c) Materials are grouped for fun.
- D.
  
  (d) Materials are grouped according to their uses.
Correct Answer
C. (c) Materials are grouped for fun.

Explanation
The statement that materials are grouped for fun is not true. Materials are typically grouped for convenience, to study their properties, or according to their uses. Grouping materials for fun does not serve any practical purpose or contribute to scientific understanding.

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8.

Which type of the following materials is used for making the front glass (wind screen) of a car?
- A.
  
  (a) Transparent
- B.
  
  (b) Translucent
- C.
  
  (c) Opaque
- D.
  
  (d) All the above
Correct Answer
A. (a) Transparent

Explanation
Transparent materials are used for making the front glass (windscreen) of a car. This is because transparent materials allow light to pass through them without scattering, making it easier for the driver to see through the glass. Translucent materials allow some light to pass through but scatter it, while opaque materials do not allow any light to pass through. Since the front glass of a car needs to provide clear visibility, it is made from transparent materials.

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9.

Which among the following are commonly used for making a safety pin?
- A.
  
  (a) Wood and glass
- B.
  
  (b) Plastic and glass
- C.
  
  (c) Leather and plastic
- D.
  
  Steel and plastic
Correct Answer
D. Steel and plastic

Explanation
Safety pins are commonly made using steel and plastic. Steel is used for the pin itself as it provides strength and durability. Plastic is used for the head of the safety pin, which is the part that is held and manipulated. Plastic is lightweight, inexpensive, and easy to mold into different shapes, making it suitable for the head of the safety pin.

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10.

_____________is a gas that dissolves in water and is important for marine life.

Correct Answer
oxygen

Explanation
Oxygen is a gas that dissolves in water and is important for marine life. Marine organisms rely on dissolved oxygen in water for respiration, just like terrestrial organisms rely on oxygen in the air. It is essential for the survival of aquatic organisms, as it is involved in various biochemical processes, including cellular respiration. Oxygen levels in water can fluctuate due to factors such as temperature, salinity, and photosynthesis. Therefore, maintaining adequate dissolved oxygen levels is crucial for the health and well-being of marine ecosystems.

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Sorting Materials Into Groups

An iron nail is kept in each of the following liquids. In which case would it lose its shine and appear dull?

Soft substances are easy to scratch

While doing an activity in class, the teacher asked Paheli to handover a transluscent material. Which among the following materials will Paheli pick and give her teacher?

Mirror is a/an_____________kind of substance (Opaque/Transparent)

Boojho found a bag containing the following materials (i) Mirror (ii) Paper stained with oil (iii) Magnet (iv) Glass spectacles Help Boojho in finding out the material(s) which is/are opaque.

Which pair of substances among the following would float in a tumbler half filled with water?(one or more correct options are right)

Which of the following statements is not true?

Which type of the following materials is used for making the front glass (wind screen) of a car?

Which among the following are commonly used for making a safety pin?

_____________is a gas that dissolves in water and is important for marine life.