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1. Define matter 2. What is Latent heat of fusion? 3. Define Evaporation 4. Write the factor affecting evaporation? 5. Why do we were cotton clothes in summer? 6. How water come on the surface of glass containing ice cold water? 7. What is sublimation? 8. Give two example of sublimation 9. Write three characteristics of particle of matter? 10. Why does not temperature change when 0 o c Ice heated up to change it in 0 o c water? 11. Convert 300 K into Celsius 12. Why 100 O C steam cause more severe burn then 100 O C water. 13. Covert 250 O C into Kelvin 14. Suggest a method to liquefy atmospheric gases. 15. Why does our palm feel cold when we put some acetone or petrol or perfume on it? 16. Why are we able to sip hot tea or milk faster from a saucer rather than a cup? 17. Give reason for the following observations. (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfume sitting several meters  away. 18. Why the level of w

                                           Osb India Motion Theory DPP 1. Write three differences between distance and displacement 2. Difference between uniform and non-uniform motion . 3. What do you mean by average speed 4. Explain scalar and vector quantities 5. Define acceleration. 6.   Using graphical method prove s=ut+1/2 at 2 7. Using graphical method prove v 2 -u 2 =2as 8. Can you think of an example when an object does not change its magnitude of velocity but only its direction of motion? 9. When we move stone in a circular orbit and release it then the stone move in straight line. Why? 10. When will say (I) body is in uniform acceleration (ii) body is in non-uniform acceleration 11. Are rest and motion is relative term? Explain why 12. If the displacement of a body is zero, is it necessary that the distance coyered by it is also zero? Why 13. Can the displacement be greater than the distance travelled by an object? Why 14. When do the distance and displacemen

                                                    Osb India Optics DPP Class 10  1. In reflection of light the angle of reflection is a) equal to angle of incidence b) greater than angle of incidence c) less than angle of incident d) Both (a) &(b) 2. When light travel from  air to glass it a) bend away from normal b) bend towards the normal c)does not bend d)none of these 3. Refraction causes due  to a) change in wavelength of light b) change in speed of light c) change in frequency of light d) Both (a) & (c) 4. The correct relationship between refractive index and speed of light is a) u=c/v b) u = v/c c) u=v×c d) u=v+c 5. The speed of light in water is 2.25 ×10^8 m/s then refractive index of water is a) 2.32 b)1.03 c)1.33  d)2.33 6. The refractive indices of kerosene oil, water and turpentine oil are 1.44, 1.33, 1.47 respectively. In which of these material light travel faster? a) Kerosene oil b) Turpentine oil c) water d) Equal in all 7. A coin dipped in water s

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