Question

Short answer questions (Any 5) : 2×5=10

1. What do you mean by refraction?

2. What do you mean by dispersion of light?

3. Write any two rules for making ray diagrams for spherical mirror?

4. How do you measure work done?

5. Define power. What is its SI unit?

6. What are the two factors that affect the moment of force and how?

7. Define law of conservation of energy.l​

Answer 1

Answer:

1. What do you mean by refraction?

ANS: A change of direction that light undergoes when it enters a medium with a different density from the one through which it has been traveling — for example, when, after moving through the air, it passes through a prism.

2. What do you mean by dispersion of light?

ANS: The process of splitting up a white beam into constituent colors as it passes through a refracting medium is known as the dispersion of light.

3. Write any two rules for making ray diagrams for the spherical mirror?

ANS: The line through the focus passed parallel to the principal axis. The Ray passing the center of curvature good unaffected. Here the angle of incidence and angle of reflection is 0°. The Ray hitting the pole of the mirror makes the same angle i.e angle of incidence is equal to reflection.

4. How do you measure work done?

ANS: Work done is measured in joules (J)

5. Define power. What is its SI unit?

ANS: In physics, power is the amount of energy transferred or converted per unit of time. In the International System of Units, the unit of power is the watt, equal to one joule per second. In older works, power is sometimes called activity. Power is a scalar quantity.

6. What are the two factors that affect the moment of force and how?

ANS: Factors on which moment of force depends  

(i) The magnitude if the force applied  

(ii) The distance is a line of action of the force from the axis of rotation.

7. Define law of conservation of energy

ANS: The law of conservation of energy states that the total energy of an isolated system remains constant; it is said to be conserved over time. ... For instance, chemical energy is converted to kinetic energy when a stick of dynamite explodes.

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