Assertion and Reason: Light Shadows and Reflections | 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: there are three types of objects which frequently allowed the passing of light.
Reason: transparent objects do not allow pass through 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: (c) 
In this question, both the assertion and the reason are incorrect statements. The assertion states that there are three types of objects that frequently allow the passing of light, but it does not specify what those types are. Additionally, the reason given is incorrect. Transparent objects are the ones that allow light to pass through them, so the reason should be that "transparent objects allow pass through them." The assertion is incorrect because it lacks clarity, and the reason is incorrect as well. The correct answer is option C.

Q2: Assertion: Never ever look directly at the sun that could be extremely harmful for eyes.
Reason: Pin hole camera can be used to brightly little objects.
(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) 
Ans: In this question, the assertion is a correct statement. Looking directly at the sun can indeed be extremely harmful to the eyes due to the intense light and UV radiation emitted by the sun. However, the reason provided is incorrect. A pinhole camera is used to create an inverted image of a bright object by allowing light to pass through a small hole and project an image on a surface. It is not used to "brightly lit" objects; rather, it is used to project an image. The reason is not a correct explanation for the assertion. Therefore, the assertion is correct, but the reason is incorrect, leading to option B as the correct answer.

Q3: Assertion: When light falls on the mirror it get reflected.
Reason: When light falls on transparent object reflection of light happed.
(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)
In this question, the assertion is a correct statement. When light falls on a mirror, it undergoes reflection, which is a fundamental property of mirrors. However, the reason given is incorrect. Reflection of light primarily occurs when light falls on a reflective surface, such as a mirror. Transparent objects, on the other hand, allow light to pass through without significant reflection. Therefore, the assertion is correct, but the reason is incorrect. The correct answer is option A.

Q4: Assertion: A shadow is formed when an opaque object comes in the path of light.
Reason: Light travels in a straight line and when it hits an opaque object, it cannot pass through it, leading to the creation of shadows.
(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)
It is true that shadows are formed when an opaque object blocks the path of light. The reason is also true because light travels in straight lines and when an opaque object blocks its path, the light is unable to pass through it, causing a shadow to form.

Q5: Assertion: Reflection of light is the bouncing back of light when it strikes a shiny surface.
Reason: Reflection happens because light is a wave.
(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)
The process of light bouncing back when it strikes a shiny surface is indeed known as reflection. However, the reason given doesn't explain this assertion accurately. While it is true that light behaves as a wave, the reflection of light primarily occurs due to the fact that light rays change their path or bounce back when they hit a reflective or shiny surface.

Q6: Assertion: Mirrors are used to see our image because they reflect light.
Reason: Mirrors are opaque objects.
(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: (c)
Mirrors reflect light and therefore they are used to see our image. However, the reason given is false because mirrors are not opaque objects. In fact, they are smooth and shiny surfaces that reflect light.

Q7: Assertion: Transparent objects allow light to pass through them completely.
Reason: Transparent objects are colorless.
(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)
The assertion is true as transparent objects do allow light to pass through them completely. However, the reason given is not the correct explanation. Transparent objects are not always colorless. They can have color, yet still be transparent because they do not scatter or absorb light, but rather let it pass through them.

Q8: Assertion: We see objects when light from them enters our eyes.
Reason: Light helps us perceive shape, color, and depth of the objects.
(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)
We see objects when light from them enters our eyes, which is then processed by our brain to form an image. Light does indeed allow us to perceive the shape, color, and depth of objects, thus making it possible for us to see and understand the world around us.