Assertion and Reason: Sorting Materials into Groups | Class 6: Additional Practice PDF Download

The questions below consists of an assertion and a Reason. Use the key to choose the appropriate answer.

Q1: Assertion: Materials which can be compressed or scratched easily are called soft.
Reason: The material which can difficult to compress are called hard.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (b)
While both the assertion and reason are factually correct, they do not form a cause-and-effect relationship. Soft materials can indeed be compressed or scratched easily, and hard materials are difficult to compress. However, the reason does not provide a proper explanation for why soft materials are called soft. Softness is typically associated with the ease of deformation, and this property is not solely dependent on compressibility.

Q2: Assertion: some materials are soluble in water whereas some others are in soluble
Reason: different types of materials have different properties.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a)
The assertion is correct in stating that some materials are soluble in water, while others are insoluble. The reason is also correct because the solubility of materials in water, and many other properties, is indeed determined by the nature and composition of the materials. Different types of materials have different chemical and physical properties that dictate their behavior in various conditions, including solubility in water.

Q3: Assertion: The materials through which objects can be seen but not clearly are known as materials translucent.
Reason: the oily patch on paper are the translucent.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a)
Both the assertion and the reason are correct. Translucent materials allow light to pass through but scatter it, making objects visible but not necessarily clear. The example given in the reason, an oily patch on paper, is indeed translucent. It allows some light to pass through but diffuses it, so you can see the underlying paper but not with great clarity. The reason effectively explains why such materials are called translucent.

Q4: Assertion: Objects can be sorted based on their color, shape, size, and weight.
Reason: Sorting is a method of arranging items into groups or sets on the basis of their properties.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a)
Sorting is a basic scientific skill that involves classifying objects based on their properties. These properties can include color, shape, size, weight, and many others.

Q5: Assertion: We can use a magnet to separate iron filings from a mixture of sand and iron filings.
Reason: Iron is a magnetic material.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a)
Iron is a magnetic material, and a magnet attracts it. Therefore, we can separate iron filings from a mixture of sand and iron filings using a magnet.

Q6: Assertion: Opaque materials do not allow light to pass through them.
Reason: These materials absorb all the light that falls on them.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a)
Opaque materials do not allow light to pass through them because they absorb all the light that falls on them, not allowing any light to pass through to the other side.

Q7: Assertion: We can separate a mixture of salt and water by evaporation.
Reason: Salt is soluble in water.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a)
Salt is soluble in water, meaning it dissolves in water to form a solution. When we evaporate the water, the salt which was dissolved in the water gets left behind. Hence, we can separate a mixture of salt and water by evaporation.

Q8: Assertion: Some objects float in water while others sink.
Reason: The ability of an object to float or sink in water depends on its density.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.
Ans: (a)
Objects that are less dense than water float, while those that are more dense sink. This is why some objects float in water while others sink.