Home
Class 11
PHYSICS
Assertion : A change in the temperature ...

Assertion : A change in the temperature of a body cause change in dimentions.
Reason : The dimentions of a body decrease due to the increase in its temperature.

A

If both assertion and reason are true and reason is the correct explanation of assertion.

B

If both assertion and reason are true and reason is not the correct explanation of assertion.

C

If assertion is true and reason is false.

D

If both assertion and reason are false.

Text Solution

AI Generated Solution

The correct Answer is:
To solve the assertion-reason question, we need to evaluate both the assertion and the reason provided: ### Step 1: Analyze the Assertion The assertion states: "A change in the temperature of a body causes a change in dimensions." - **Explanation**: When the temperature of a body changes, the kinetic energy of its molecules changes as well. An increase in temperature causes the molecules to move more vigorously, which leads to an increase in the distance between them. This results in the expansion of the body. Conversely, if the temperature decreases, the molecules lose energy, come closer together, and the body contracts. Therefore, the assertion is **true**. ### Step 2: Analyze the Reason The reason states: "The dimensions of a body decrease due to the increase in its temperature." - **Explanation**: This statement is incorrect. When the temperature of a body increases, the dimensions of the body actually increase due to thermal expansion. The molecules move farther apart, leading to an increase in size. Thus, the reason is **false**. ### Step 3: Conclusion Based on the analysis: - The assertion is true. - The reason is false. ### Final Answer The correct evaluation is that the assertion is true, but the reason is false. Therefore, the correct option is that the assertion is true, and the reason is false. ---
To solve the assertion-reason question, we need to evaluate both the assertion and the reason provided: ### Step 1: Analyze the Assertion The assertion states: "A change in the temperature of a body causes a change in dimensions." - **Explanation**: When the temperature of a body changes, the kinetic energy of its molecules changes as well. An increase in temperature causes the molecules to move more vigorously, which leads to an increase in the distance between them. This results in the expansion of the body. Conversely, if the temperature decreases, the molecules lose energy, come closer together, and the body contracts. Therefore, the assertion is **true**. ### Step 2: Analyze the Reason ...
Promotional Banner

Topper's Solved these Questions

  • THERMAL PROPERTIES OF MATTER

    NCERT FINGERTIPS ENGLISH|Exercise Specific Heat Capacity|5 Videos

  • THERMAL PROPERTIES OF MATTER

    NCERT FINGERTIPS ENGLISH|Exercise Calorimetry|4 Videos

  • THERMAL PROPERTIES OF MATTER

    NCERT FINGERTIPS ENGLISH|Exercise Exampler Problems|8 Videos

  • SYSTEM OF PARTICLES AND ROTATIONAL MOTIONS

    NCERT FINGERTIPS ENGLISH|Exercise NCERT Exemplar|8 Videos

  • THERMODYNAMICS

    NCERT FINGERTIPS ENGLISH|Exercise Assertion And Reason|15 Videos

Similar Questions

Explore conceptually related problems

When the temperature of a body increases

Solids can change into liquids on increasing the temperature.

Assertion: The viscosity of water is less than blood. Reason : The viscosity of liquids decreases with increases in temperature.

Assertion: The value of ionic product of water (K_w) increases on increasing the temperature. Reason: The ionisation of water increases with an increase in temperature.

Assertion (A): Ionic conductivities increase with increase of temperature and pressure. Reason (R): Viscosity of water decreases with increasew of temperature and increases with the increases of pressure.

Assertion : When temperature of a conductor is increased, its resistance increases. Reason : Free electrons collide more frequently.

Assertion (A): May endothermic reactions that are not spontaneous at room temperature become spontaneous at high temperature. Reason (R ) : Entropy of the system increases with increase in temperature.

Assertion : Rate of reaction increases with increase in temperature. Reason : Number of effective collisions increases with increase in temperature.

These question consists of two statements each printed as Assertion and Reason. While answering these question you are required to choose any one of the following five responses. Assertion: If temperature of a body is increased, more number of photons of small wavelengths are radiated. Reason: By increasing the temperature, total energy radiation will increase.