What is the relation between mass and weight? The mass of an object is 3.4 kg. Find its weight.
Q2. Distinguish between the density and the relative density of a substance.
Q3. What is circular motion? How it is different from rotatory motion?
Q4. What is one oscillation of a simple pendulum? How does the time period of a simple pendulum depend on its length, the amplitude of its oscillations and the mass of the bob?
Q5. What is the law of conservation of energy? Why does a simple pendulum not keep swinging forever under ordinary circumstances?
Q6. What is potential energy? In what ways can a body acquire potential energy?
Q7. Give 3 advantages of using electrical energy?
Q8. Define reflection and its two laws.
Q9. What is meant by lateral inversion? Write laterally inverted image of STAR.
Q10. (i) Differentiate between real and virtual image.
(ii) What does the hatching in a drawing of a mirror represent ?
Q11. Distinguish between regular and diffused reflection. Also draw the diagram showing regular and diffused reflection.
Q12. Give the transformation of energy in the following examples:
a) moving fan b)bursting crackers c) torch cells
Q13. Give four characteristics of an image formed by a plane mirror.
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Don't ask exam question
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mass of an object defines as the total constitute particles in it.... whereas weight of an body is the force(gravitational) through which earth attract an object towards it....
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