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Test: Structure and Properties of Material -2 - Class 6 MCQ


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20 Questions MCQ Test - Test: Structure and Properties of Material -2

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Test: Structure and Properties of Material -2 - Question 1

Which physical property describes a substance's ability to be drawn into wires or hammered into thin sheets without breaking?

Detailed Solution for Test: Structure and Properties of Material -2 - Question 1
Ductility is the physical property that allows a material to be drawn into wires or hammered into thin sheets without breaking. Materials like gold and copper exhibit high ductility, making them valuable in various industries, including electrical wiring and jewelry making.
Test: Structure and Properties of Material -2 - Question 2

Which physical property is defined as the ability of a material to conduct heat?

Detailed Solution for Test: Structure and Properties of Material -2 - Question 2
Thermal conductivity is the physical property that describes a material's ability to conduct heat. Materials with high thermal conductivity transfer heat efficiently, while those with low thermal conductivity act as insulators. Understanding this property is essential in designing efficient heat exchangers, insulating materials, and electronic devices.
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Test: Structure and Properties of Material -2 - Question 3

Which step is essential in determining the boiling point of a substance?

Detailed Solution for Test: Structure and Properties of Material -2 - Question 3
To determine the boiling point of a substance accurately, it is crucial to heat the material gradually while monitoring the temperature using a thermometer. This process allows for the observation of the point at which the substance transitions from a liquid to a gas state, known as the boiling point.
Test: Structure and Properties of Material -2 - Question 4
Why is it important to record the temperature at regular intervals when determining melting or boiling points?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 4
Recording the temperature at regular intervals is crucial in accurately determining the melting or boiling points of a substance. This practice helps identify the specific temperature at which the material undergoes a phase transition, providing precise and reliable data for scientific analysis and experimentation.
Test: Structure and Properties of Material -2 - Question 5
Why are understanding physical and chemical properties essential for scientists and engineers?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 5
Understanding both physical and chemical properties is essential for scientists and engineers to develop effective medications. By knowing the properties of materials, scientists can create pharmaceuticals that are safe, efficient, and reliable for treating various conditions.
Test: Structure and Properties of Material -2 - Question 6
Why are chemical properties important in material science?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 6
Chemical properties are important in material science to identify unknown materials and understand their possible reactions in different environments. This knowledge helps scientists and engineers in selecting and utilizing materials effectively, ensuring safety, efficiency, and innovation in various applications.
Test: Structure and Properties of Material -2 - Question 7
Why is it important to handle strong acids and alkalis with care?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 7
Strong acids and alkalis can cause harm to human skin and eyes, which is why they require careful handling and proper precautions. It is essential to be aware of the potential dangers they pose and to follow safety guidelines to prevent accidents and injuries in laboratory settings.
Test: Structure and Properties of Material -2 - Question 8
Why are hazard symbols used to label substances like strong acids and alkalis?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 8
Hazard symbols are utilized to communicate specific dangers associated with substances like strong acids and alkalis. These symbols provide information about the potential hazards such as corrosiveness, toxicity, flammability, and environmental or health risks, enabling individuals to recognize and handle these substances safely.
Test: Structure and Properties of Material -2 - Question 9
How does the pH scale classify substances based on their acidity or alkalinity?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 9
The pH scale categorizes substances based on their acidity or alkalinity. Substances with a pH less than 7 are considered acidic, with stronger acids having lower pH numbers. On the other hand, substances with a pH greater than 7 are classified as alkaline, with stronger alkaline substances having higher pH numbers up to 14. A pH of 7 is considered neutral on the pH scale.
Test: Structure and Properties of Material -2 - Question 10
How does the pH value of a substance relate to its acidity or alkalinity?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 10
In the context of pH values, lower values indicate stronger acidity, while higher values indicate alkalinity. Substances with pH values below 7 are acidic, with stronger acids having pH values closer to 0. Conversely, substances with pH values above 7 are alkaline, with stronger alkaline substances having pH values closer to 14. pH serves as a scale to quantify the acidity or alkalinity of substances.
Test: Structure and Properties of Material -2 - Question 11
What term describes substances with a pH less than 7?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 11
Substances with a pH less than 7 are classified as acids. Acids are known for their sour taste, ability to react with metals, and their characteristic of turning blue litmus paper red. An interesting fact is that common household items like lemon juice and vinegar are examples of acidic substances.
Test: Structure and Properties of Material -2 - Question 12
Which hazard symbol is used to warn of the dangers associated with substances or radiation?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 12
The hazard symbol with an exclamation mark is used to warn of the dangers associated with substances or radiation. This symbol indicates that a substance may be harmful or irritating upon contact. It serves as a visual warning to promote caution and safe handling practices when dealing with potentially hazardous materials.
Test: Structure and Properties of Material -2 - Question 13
How many different types of atoms make up the elements found in nature?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 13
There are about 100 different types of atoms that make up the elements found in nature. Each element consists of only one type of atom, and these atoms are the fundamental units of matter.
Test: Structure and Properties of Material -2 - Question 14
How are elements organized in the Periodic Table?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 14
Elements in the Periodic Table are organized in rows (periods) and columns (groups) based on increasing atomic number and similar chemical properties. This arrangement helps in understanding the relationships and trends among the elements.
Test: Structure and Properties of Material -2 - Question 15
Which compound is composed of one carbon atom bonded to two oxygen atoms?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 15
Carbon dioxide (CO₂) is composed of one carbon atom bonded to two oxygen atoms. This compound is a key component in the carbon cycle and plays essential roles in processes such as photosynthesis and respiration. An interesting fact is that carbon dioxide is a greenhouse gas that contributes to global warming when present in excessive amounts in the atmosphere.
Test: Structure and Properties of Material -2 - Question 16
What distinguishes compounds from mixtures in terms of separation?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 16
One key distinction between compounds and mixtures in terms of separation is that mixtures retain their own identity and can be separated by physical means. Unlike compounds, where the elements are chemically bonded in specific proportions, mixtures are a physical blend of components that can be separated using methods such as filtration, evaporation, or distillation. An interesting fact is that the ability to separate mixtures into their individual components is crucial in various industries, including food processing and environmental remediation.Response:
Test: Structure and Properties of Material -2 - Question 17
What property makes diamond, a non-metal, stand out from other non-metals?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 17
Diamond, despite being a non-metal, is exceptional for its hardness. It is one of the hardest naturally occurring materials, making it highly valuable for industrial purposes like cutting, grinding, and drilling.
Test: Structure and Properties of Material -2 - Question 18
Why are metals typically good conductors of both heat and electricity?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 18
Metals are generally good conductors of both heat and electricity due to the arrangement of their particles in layers that can slide easily past each other. This property allows for the efficient transfer of heat and the flow of electrical charge through the material.
Test: Structure and Properties of Material -2 - Question 19
Lead, a metal, is known for which of the following properties?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 19
Lead, a metal, is known for its relatively low melting point compared to other metals. Additionally, it is a poor conductor of electricity but has been historically used for various applications such as piping, batteries, and radiation shielding.
Test: Structure and Properties of Material -2 - Question 20
What property of metals contributes to their malleability?
Detailed Solution for Test: Structure and Properties of Material -2 - Question 20
The malleability of metals is attributed to the layers of particles they possess, which can slide easily past each other. This property allows metals to be shaped without breaking and explains why they are often used in various forms of metalworking processes.
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