# 8th physics (ENGLISH MEDIUM NEW)

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Welcome to your 8th physics (ENGLISH MEDIUM NEW)

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1. The magnitude of a physical quantity consists of ……………..

2. Among the following, which is not an metric system?

3. …………. is a physical quantity that expresses the degree of hotness or coldness of a substance.

4. Assertion : The SI unit of temperature is kelvin. Reason : Thermometers are calibrated with some standard scales like Celsius, fahrenheit and kelvin.

5. The SI unit of mass is ……………..

6. SI unit stands for

7. Luminous intensity is the intensity of

8. If we apply a force against the direction of motion of a body, then the body will –

9. Unit of pressure is –

10. The value of the atmospheric pressure at sea level is –

11. Which of the following liquids has more viscosity?

12. The SI unit of pressure is ……………..

13. The wear and tear in the machine part is due to …………….

14. The total force exerted by a body normal to the surface is called …………….

15. The atmospheric pressure on the surface of the earth is about ………………

16. Assertion : Friction always opposes the motion. Reason : Whenever one surface moves or tries to move over another surface, the force of friction starts acting on the surfaces.

17. The centre of a sphere of which the reflecting surface of a spherical mirror is a part is called –

18. The spherical mirror used as a rear view mirror in the vehicle is –

19. The imaginary line passing through the centre of curvature and pole of a spherical mirror is called –

20. Focal length is equal to half of the –

21. If the focal length of a spherical mirror is 10 cm, what is the value of its radius of curvature?

22. If the image and object distance is same, then the object is placed at –

23. The refractive index of water is –

24. In the head lights of motor vehicles, ……………… mirrors are used as reflectors.

25. Incident angle of a ray of light is 30°. The angle between the incidend ray and the reflected ray is …………….

26. The velocity of light in vacuum is 3 x 108 ms-1 and in glass is 2 x 108 ms-1. The refractive index of glass is .

27. In dispersion, the colour of light that will bend more is ……………..

28. Heat is a form of ………….

29. If you apply some heat energy to a substance, which of the following can take place in it?

30. If you apply equal amount of heat to a solid, liquid and gas individually, which of the following will have more expansion?

31. calorie equals ……………….

32. Which of the following is not a scale of temperature?

33. In solid substances, heat is transferred by –

34. Process of change of state from gaseous state to liquid state is called …………….

35. When an ebonite rod is rubbed with fur, the charge acquired by the fur is –

36. Which of the following a simple circuit must have?

37. Fuse is –

38. Electric charge can be transferred from a charged object to another through ……………….

39. The value of charge of an electron is equal to ……………….

40. The material which does not allow electric current is called ………………..

41. An electrolyte ……………….

42. Most common industrial application of chemical effects of electric current is ………………..

43. Sound waves travel very fast in …………..

44. Which of the following are the characteristics of vibrations? (i) Frequency (ii) Time period (iii) Pitch (iv) Loudness

45. Find the odd one out.

46. The range of audible frequency for the human ear is …………..

47. If the amplitude and frequency of a sound wave are increased, which of the following is true?

48. Assertion: When lightning strikes, the sound is heard a little after the flash is seen. Reason: The velocity of light is greater than that of the sound.

49. One of the following is an example for a permanent magnet.

50. …………….. instruments produce a specific sound when they are struck, scrapped or clashed