Embark on an exhilarating journey to physics excellence with our exclusive “Physics Past Paper for Class 9.” Tailored meticulously for the enriching year of 2019, these notes transcend traditional study materials. Immerse yourself in the wisdom of the past as we decode crucial concepts and dissect exam trends, making this your ultimate guide for a holistic preparation experience.
Short Answer Questions.
Q1. What is meant by Boiling Point?
Ans. Boiling Point:
The boiling point is the temperature at which a substance changes from a liquid to a gas under normal atmospheric pressure. It is the temperature at which the vapor pressure of the liquid equals the atmospheric pressure.
Q2. What is Hooke’s Law?
Ans. Hooke’s Law:
Hooke’s Law states that the force required to extend or compress a spring by some distance is proportional to that distance. Mathematically, F = k x , where F is the force, k is the spring constant, and x is the displacement.
Q3. Write down one application of Thermal Expansion in Daily Life.
Ans. Thermal Expansion Application:
One daily life application is the expansion joints in bridges or sidewalks. These joints allow the concrete to expand or contract with temperature changes, preventing damage.
Or
One application of thermal expansion in daily life is the use of bimetallic strips in thermostats. These strips consist of two different metals with different coefficients of thermal expansion, causing them to bend when exposed to temperature changes. This bending is utilized to control switches in devices like thermostats.
Q4. What is Biomass Energy?
Ans. Biomass Energy:
Biomass energy is derived from organic materials, such as plants and animal waste. It can be used for heating, electricity generation, or as a biofuel. Biomass energy is considered renewable because it relies on the continuous growth of plants.
Q5. What is meant by Natural and Artificial Satellite?
Ans. Natural and Artificial Satellite:
A natural satellite is a celestial body that orbits a planet, e.g., Earth’s moon. An artificial satellite is a human-made object intentionally placed into orbit around a celestial body, like communication or weather satellites.
Q6. Write a note on Stable Equilibrium.
Ans. Stable Equilibrium:
In stable equilibrium, a system returns to its original position when disturbed. For example, a ball at the bottom of a bowl is in stable equilibrium; if displaced slightly, it returns to the bottom.
Q7. What is meant by Elasticity?
Ans. Elasticity:
Elasticity is the property of a material to return to its original shape and size after deformation. It is described by Hooke’s Law for small deformations.
Q8. Define Centripetal Force and Write its Formula.
Ans. Centripetal Force:
Centripetal force is the force that keeps an object moving in a circular path. Its formula is F= mv2/r, where m is mass, v is velocity, and r is the radius of the circle.
Q9. Differentiate between Scalar and Vector.
Ans. Scalar vs. Vector:
Scalars are quantities with only magnitude, like speed. Vectors have both magnitude and direction, like velocity. Scalar quantities combine using simple arithmetic, while vectors use vector addition.
Q10. What is Micrometer and why it is used?
Ans. Micrometer:
A device used for measuring very small distances with high precision. It’s commonly used in laboratories and manufacturing for accurate measurements.
Q11. Define Force.
Ans. Force:
In physics, force is any interaction that causes an object to undergo a certain change, such as accelerating, stopping, or changing direction.
Q12. What is meant by Couple?
Ans. Couple:
In physics, a couple refers to two equal and opposite forces that act on different points of an object, causing it to rotate.
Q13. Define Potential Energy.
Ans. Potential Energy:
The energy an object possesses due to its position or state, like gravitational potential energy.
Q14. What is the Specific Heat Capacity?
Ans. Specific Heat Capacity:
The amount of heat energy required to raise the temperature of a unit mass of a substance by one degree Celsius.
Unveil concise and impactful answers to the paper’s questions, complemented by visually stimulating diagrams that transform learning into an engaging adventure. The magic of physics past papers class 9 awaits; dive in, explore, and witness your understanding soar to new heights. Your roadmap to success is intricately woven within these pages, where the focus is not just on studying but on unlocking the mysteries of physics with zeal and fascination.
