Class 9th Physics Unit 1 – Physical Quantities & Measurement

physics 9th notes Chapter No 1

1. Which one is more precise?

 
 
 
 

2. If zero of the vernier scale is on the left side of the zero of the main scale then it is known as ______ zero error:

 
 
 
 

3. The study of the isolated nuclei of an atom is called:

 
 
 
 

4. The radius of wire is 0.022 cm. The number of significant figures in the measurements are:

 
 
 
 

5. The word science is derived from the Latin word

 
 
 
 

6. Meter rule can measure the length accurately up to:

 
 
 
 

7. 1L =?

 
 
 
 

8. 1ps is equal to:

 
 
 
 

9. Distance of moon from the earth is:

 
 
 
 

10. The SI unit of intensity of light is:

 
 
 
 

11. Mass of elephant is:                                                        

 
 
 
 

12. Much of the universe is made up of:

 
 
 
 

13. 2.1203 cm is the length measured by meter rule, the number of significant figures in measurement are:

 
 
 
 

14. If the zero of the circular scale is below the horizontal line then the zero error will be:

 
 
 
 

15. Volume measuring scale has a vertical scale in:

 
 
 
 

16. The least count of vernier calipers is:

 
 
 
 

17. If the zero of the circular scale is below the horizontal line then the zero error is to be:

 
 
 
 

18. The number of significant figures in 0.036 are:                                 

 
 
 
 

19. The terms used internationally for multiples and submultiples of various units are known as:

 
 
 
 

20. For scientific notation internationally accepted practice is that there should be how many digit(s) before the decimal point.

 
 
 
 

21. Mass of typical protein molecule is:                                           

 
 
 
 

22. Vernier Constant is also known as:

 
 
 
 

23. The branch of science which deals with the study of properties of matter, energy and their mutual relationship is called:

 
 
 
 

24. Separation between divisions on the vernier scale of the vernier calipers is:

 
 
 
 

25. 1.35 is rounded off as:

 
 
 
 

26. If zero of the vernier scale is on the right side of the zero of the main scale then it is known as _____ zero error:

 
 
 
 

27. Mass of grain of table salt is:                                                

 
 
 
 

28. One meter is equal to:

 
 
 
 

29. If zero of the vernier scale is on the left side of the zero of the main scale then zero error is to be:

 
 
 
 

30. In screw gauge, the distance moved forward or backward in one complete rotation of the circular scale is known as:

 
 
 
 

31. In any measurement, the accurately known digits and first doubtful digit are known as:

 
 
 
 

32. Mass of uranium atom is:                                                   

 
 
 
 

33. The study of internal structure of earth and its activities like seismography is called:

 
 
 
 

34. 10⁶ Stands for:

 
 
 
 

35. Least count of digital vernier callipers is

 
 
 
 

36. A physical balance is used to measure:

 
 
 
 

37. Total length of the vernier scale is:

 
 
 
 

38. Number of divisions on the vernier scale are:

 
 
 
 

39. The number of significant figures in 1.40 x 10⁵ are

 
 
 
 

40. The international system of units is abbreviated as:

 
 
 
 

41. For scientific notation internationally accepted practice is that there should be digit before the decimal point.

 
 
 
 

42. Length of the smallest division on main scale of the vernier calipers is:

 
 
 
 

43. The zeroes in between the digits are considered:

 
 
 
 

44. If zero of the Vernier scale is on the right side of the zero of the main scale then zero error is to be:

 
 
 
 

45. The least count of Screw Gauge is:

 
 
 
 

46. The least count of digital Vernier Callipers is:                                                                 

 
 
 
 

47. SI unit of electric charge is

 
 
 
 

48. The study of properties of the ionic state of matter is called

 
 
 
 

49. If the zero of the circular scale is above the horizontal line then the zero error will be:

 
 
 
 

50. 1µs is equal to:

 
 
 
 

51. If zero of the Vernier scale is on the right side of the zero of the main scale then it is known as

 
 
 
 

52. If the zero of the circular scale is above the horizontal line then the zero error is to be:

 
 
 
 

53. If zero of the Vernier scale is on the left side of the zero of the main scale then zero error is to be:

 
 
 
 

54. Least count of digital stop watch is:

 
 
 
 

55. The number of significant figures in 1.406 are:

 
 
 
 

56. Total number of divisions on the circular scale of Screw Gauge are:

 
 
 
 

57. Mass of 1.0 litre of water is:

 
 
 
 

58. Distance of the sun from the earth is:

 
 
 
 

59. Pitch of the screw gauge is:

 
 
 
 

60. If zero of the vernier scale is on the right side of the zero of the main scale then zero error is to be:

 
 
 
 

61. Amount of a substance in terms of numbers is measured in:   

 
 
 
 

62. S.I unit of pressure is

 
 
 
 

63. _______can accurately measure up to one tenth of a millimeter.

 
 
 
 

64. One Femto is equal to

 
 
 
 

65. Least count of mechanical stop watch is:

 
 
 
 

Short Questions

Define Physics?
Define prefixes. Interconvert the prefixes and their symbols to indicate multiples and sub-multiples for both bases and derived units?
Define Science?
Define Scientific Notation.
Define Standard Notation.
Define Vernier Constant or Define Least Count of Vernier Callipers.
Describe the construction and working of beam balance?
Describe the construction and working of electronic balance?
Describe the construction and working of lever balance?
Describe the construction and working of physical balance?
Describe the division of science into two main streams?
Describe the Lord Kelvin statement?
Estimate your age in seconds.
Explain with examples the derived units?
Express 1m³ = ________ L.
Find the base quantities involved in each of the following derived quantities: (a) Speed (b) Volume (c) Force (d) Work
How can we measure the volume of small irregular shape objects which floats (a piece of cork) on the water by using a measuring cylinder?
How can you differentiate between the base and derived quantities?
How many divisions are there on Vernier scale of Vernier Callipers?
Identify the base quantity is the following: Speed , Area , Force , Distance
Identify the following as base or derived quantity: Density, force, mass, speed, time, length, temperature and volume.
List the harmful effects of the scientific inventions on nature?
Measure the length of a pencil using you. Paper scale and with a meter ruler. Which one is more accurate and why?
Name any five branches of physics?
Name five prefixes most commonly used.
Pick out the base units in the following: جول, Newton, kilogram, hertz, mole, ampere, meter, Kelvin, coulomb and watt.
The Sun is one hundred and fifty million kilometres away from the Earth. Write this as an ordinary whole number and in scientific notation.
What are Base quantities? Enlist them.
What are Base units? Write their names and symbols.
What are Derived quantities?
What are derived units?
What are Physical quantities?
What are the basic characteristics of physical quantities?
What are the main advantages of system international (SI units)?
What do you know about prefixes?
What do you understand by scientific notation?
What do you understand by the zero error of a measuring instrument?
What do you understand by the zero error of a measuring instrument? Why is the use of zero error necessary in a measuring instrument?
What is a measuring tape? What is the least count of a measuring tape?
What is a stopwatch? What is the least count of a mechanical stopwatch you have used in the laboratories?
What is a zero error? How zero error is corrected?
What is digital Vernier Callipers?
What is meant by uncertainty or error in measurement?
What is meant by vernier constant?
What is the difference between base quantities and derived quantities? Give three examples in each case.
What is the function of balancing screws in a physical balance?
What is the least count of a screw gauge?
What is the least count of the Vernier Calipers?
What is the meter rule? What is the least count of a meter rule used in the laboratories?
What is the range of the Vernier Calipers used in your Physics laboratory?
What role SI units have played in the development of science?
Which one of the two instruments is more precise and why? a) Vernier Calipers b) Screw Gauge
Which type of balance is more precise to measure the mass of an object?
Why do we need to measure extremely small interval of times?
Why do we prefer SI units?
Why do we study physics?
Why do we use zero correction?
Why is the use of zero error necessary in a measuring instrument?
Why no prefix is used with kilogramme?
Write factors effecting accuracy in a measurement.
Write Multiples and Submultiples of Length.
Write names of some safety equipment used in laboratory.
Write some laboratory safety Rules.

Long Questions

 

A chocolate wrapper is 6.7 cm long and 5.4 cm wide. Calculate its area up to a reasonable number of significant figures.        
A screw gauge has 50 divisions on its circular sale. The pitch of the screw gauge is 0.5 mm. What is its least count?       
Briefly explain lever balance and electronic balance?
Define physical quantities. Also describe its types.
Define prefixes. Also give examples.
Define Science.
Due to pressure difference on an object, an upward force acts on the object known as:
Define the branches of Physics.
Describe and explain Significant figures. What are the main points to be kept in mind
Describe the construction and working of screw gauge?
Describe the construction and working of Vernier callipers?
Describe the crucial role of physics in science, technology and society?
Describe the different branches of physics?
Describe the importance of Physics in our daily life.
Differentiate between base and derived units.
Explain with examples that science is based on physical quantities which consist of numerical magnitude and a unit.
Express the following quantities using prefixes. (a) 5000 g    (b) 2000000 W (c) 52×10⁻¹⁰kg  (d) 225×10⁻⁸s
How do the prefixes micro, nano and pico relate to each other?
List the seven units of System International (SI) along with their symbols and physical quantities?
On closing the jaws Of a Vernier Calipers, zero of the Vernier scale is on the right to its main scale such that 4th division of its Vernier scale coincides with one of the main scale division. Find its zero error and zero correction.
Rewrite the following In Standard form. (Scientific notation), (a) 1168 x 10⁻²⁷   (b) 32 x 10⁻⁵ (C) 725 x 10⁻⁵ kg (d) 0.02 x 10⁻⁸   
What are the significant figures in the following measurements? (a) 1.009 m   (b) 0.00450 kg (c) 1.66 x 10⁻²⁷kg   (d) 2001 s
What do you know about Measuring Cylinder? How volume of liquids is measured by using this cylinder?
What is a measuring cylinder? Write the method to use the measuring cylinder?
What is international system of units? Briefly discuss.
What is meant by the significant figures of a measurement? What are the main points to be kept in mind while determining the significant figures of a measurement?
What is Physical Balance? And how it is used?
Which of the following quantities have three figures? (a) 3.0066 m  (b) 0.00309 kg (c) 5.05x 10⁻²⁷kg   (d) 301.0 s
Write a detail note on vernier callipers.
Write a note on the Screw Gauge.
Write a note on the Stop Watch.
Write down the rules to round off the numbers?
Write the following quantities in standard form. (a) 6400 km (b) 38000 km (c) 300000000 ms⁻¹   (d) seconds in a day
Your hair grows at the rate of 1 mm per day. Find their growth rate in nms⁻¹

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