Physics -6
1. What is the measure of the hotness or the coldness of a body ? – Temperature
2. An instrument that is used to measure the temperature of a body is called ……….- Thermometer
3. What is the normal temperature of human body ? – 37 oC or 98.4 oF
4. At what temperature Celsius and Fahrenheit thermometers read same ?-
-40 0C
5. What are the reading points of the Clinical thermometer ? – 96 0F to 110 oF
6. ………. is the state at which all three states of matter coexist ?- Triple Point
7. What is the Triple Point of Water ?- 273.16 K
8. What are the scales of the temperature measurements ? – Celsius, Fahrenheit, Reaumur and Kelvin
9. Matching of the Scales :
= = =
10. The temperature at which Celsius and Reaumur scale read the same is ………..- Zero
11. What is the freezing point of Mercury ?- -39 oC
12. If we want to measure the temperature below – 39 0C , then we should use ?- Alcohol Thermometer
13. What is the Freezing Point of Alcohol ?- -115 0C
14. What is the name of the instrument that measures the temperature of a body through radiation ?- Pyrometer. It measures the temperature below 800 oC
15. ………. is the amount of heat required to raise the temperature of a unit mass of the substance by 1 o C.- Specific Heat. Its unit is J/Kg 0C.
16. What is the specific heat of water ? – 4200 J / Kg
17. The specific heat of water , however ………with rise in temperature from 0 0C to about 4 0C after which it ………. with temperature ?- decreases, increases
18. ……… is the amount of heat required to change the phase of the substance at constant temperature.- Latent Heat of Vaporisation
19. Zeroth Law deals with ………- Thermodynamics
20. The amount of heat given to a system is used in two ways , first to increase the internal energy and second to do the external work. This is ……….- First Law of Thermodynamics
21. ……… outcome of human experience under which heat energy can be converted into mechanical energy. –The Second Law of Thermodynamics
22. Kelvin-Planck’s Statement and Clausius Statement are related to …………- Thermodynamics
23. ………… is the increase in size of the body on heating. –Thermal Expansion
24. What are the three types of the Thermal Expansion :
· Linear Expansion (Expansion in Length)
· Superficial Expansion ( Expansion in Area )
· Cubical Expansion ( Expansion in Volume )
25. The amount of water vapour in air is called ……….- Humidity
26. The ratio of amount of water vapour actually present in a certain volume of air at a given temperature to the amount of water vapour required to saturate it is called …………- Relative Humidity
27. Relative Humidity is measured by ………..- Hydrometer
28. Transfer of heat from one place to other place is called ……………- Transmission of Heat
29. Processes for the Transmission of Heat :
· Conduction
· Convection
· Radiation
30. ____________: In this process heat is transferred without actual movement of the particles of the medium. - Conduction
31. Stefan’s Law deals with ………- Radiation of Energy
32. What are the metals used in the cooking utensils ?- Aluminum, Brass and Steel. They have low specific heat and high conductivity. The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.
33. The specific heat of sand is ……..- Low
34. Human breath is visible in winters due to ………. – Condensation
35. A thick glass tumbler cracks on pouring a hot liquid because of ………- Thermal Expansion of the Inner Surface
36. Earth is the ……….. conductor of heat .- bad
37. …….. is the radiation which makes our eyes able to see the object.- Light
38. What is the speed of light ?- 3 * 108 m/s
39. Light is a kind of ………- Energy
40. Light is a kind of ………- Transverse Wave
41. It takes __________to reach the light on the Earth from the Sun.- 8 mins and 19 secs
42. The light reflected from moon takes _______ to reach Earth. – 1.28 secs
43. Light represents the phenomenon of ……..- Reflection , Refraction, Interference , Diffraction , Scattering and Polarization
44. The return of the light into the same medium after striking a surface is called ………- Reflection
45. What are the two laws of Reflection ?
· The angle of incidence is always equal to angle of reflection .
· The incident rays, normal and reflected ray all lie in the same plane at the point of incidence.
46. Size of image is always equal to size of object in the _____________.- Plane Mirror
47. What are the two types of spherical mirrors :
· Convex Mirror
· Concave Mirror
48. Plane mirrors are used as ……….- Looking Glass
49. ……… is used as shaving mirrors , used by doctors , shades of table lamp , for search lights. – Concave Mirror
50. ………. is used as back view mirrors in vehicles, in street lamps etc .- Convex Mirror