## Measurements, Units, Physics Quantities, Dimensional Formula, Principle of Homogeneity.

Quantifying physical attributes like length, mass, and time is the essence of measurements, which is done using standardized units such as meters for length and kilograms for mass. Physical quantities like velocity or energy are measurable attributes of physical systems. The dimensional formula uses exponent notation to represent how physical quantities are constructed from fundamental dimensions like length, mass, and time. The Principle of Homogeneity ensures that the dimensions of each term in a valid equation are consistent, making sure that the units on both sides of the equation match up. For more information on these concepts and their practical applications, visit Nokryan.com.

1. The Physical sciences deals with:

- Both
- None of these
- Non-living things
**correct** - Living things

2. What type of science is physics?

- Living things
- Experimental science
**correct** - Non-living things
- None of these

3. Base quantities are those which?

- Further divide
- Can be derived
- None of these
- Remain the same
**correct**

4. Physics is an important and basic part of physical sciences which is a:

- Mathematical science
- Statistical science
- Experimental science
**correct** - None of these

5. The diameter of a nucleus is:

- 10¯¹⁶
**correct** - 10¯¹⁵
- 10¯¹²
- None of these

6. The distance from Earth to Sun is?

- 10⁸m
- 10⁹m
- 10¹⁰m
**correct** - 10¹¹m

7. Astrophysics is the branch of physics deals with the

- Physics of earth crust
- Physics of stars and galaxies
**correct** - None of these
- Physics of oceans

8. Aerodynamics is a branch of physics deals with the?

- Thermodynamics
- Hydrodynamics
- Dynamics
- None of these
**correct**

9. High energy physics is the physics of?

- Astrophysics
- Subatomic particles
**correct** - Plasma Physics
- Extra nucleus

10. Types of physical quantities are:

- 1
- 3
- 2
**correct** - None of these

11. Derived quantities are those which can

- Be subdivided
- Not derived
- None of these
- Be derived from other quantities
**correct**

12. Physics deals with the study of:

- Matter and Energy and their relationship
**correct** - Outer atmosphere
- Matter and Energy
- None of these

13. Solid state physics is the branch of physics deals with the

- Atoms and molecules
- b and c
**correct** - Structure
- Properties

14. The biological sciences deal with the?

- Living things
**correct** - None of these
- Non-living things
- Both

15. The diameter of an atom is?

- 10¯¹²m
- 10¯¹⁴m
- 10¯⁷m
- 10¯¹⁰m
**correct**

16. How many main frontiers are of fundamental science?

- 1
- None of these
- 2
- 3
**correct**

17. The relativistic mechanics in which object move?

- Greater than c
- Approach to
**ccorrect** - Equal to c
- Less than c

18. The study of nature has been classified into branches are:

- 2
**correct** - 3
- 4
- None of these

19. Plasma physics is the branch of physics deals with the?

- Atoms and molecules
- Molecules neutrals
- Ions
**correct** - All of these

20. The diameter of the milky way is?

- 10¹⁸m
- 10¹⁵m
- 10¹⁷m
- 10²⁰m
**correct**

**Physics Measurements MCQS Online Preparation Sample Paper 2 Questions with Answer**

1. Period of typical radio waves is

**1 x 10¯⁶ seccorrect**- 1 x 10¯⁸ sec
- 1 x 10¯⁵ sec
- 1 x 10¯⁹ sec

2. The number 0.0023 should be expressed as

- 2.3 x 10¯³
**correct** - None of these
- 0.23 x 10¯⁴
- 0.023 x 10¯²

3. Age of the Earth is

- 1.4 x 10¹⁷ sec
**correct** - 1.4 x 10¹⁹ sec
- 1.4 x 10¹⁵ sec
- 14 x 10¹⁷ sec

4. Steradian is a unit of

- radius
- None of these
- solid angle
**correct** - plane angle

5. The error of any measurement may occur due to?

- Faulty apparatus
- Inappropriate method
- Negligence
- All of these
**correct**

6. Period of audible sound waves is

- 1 x 10¯² sec
- 1 x 10¯¹ sec
- 1 x 10¯³ sec
**correct** - 1 x 10¯⁴ sec

7. The distance to the milk way is

- 10²⁰m
- 10³⁰m
**correct** - 10³¹m
- 10²⁹m

8. Time between the normal heart beats is

- 8 x 10¯² sec
- 8 x 10¯¹ sec
**correct** - None of these
- 8 x 10¯³ sec

9. The uncertainty of any measurement may occur due to?

- All of these
**correct** - Limitation to an instr5ument
- Natural imperfections of a person’s sense
- Natural vibrations of the object

10. Radian is an angle which is?

- Angle
- Plane angle
**correct** - Solid angle
- None of these

11. One year is equal to ___________ Seconds.

- 3.2 x 10⁶ sec
- 3.12 x 10⁷ sec
**correct** - 4.3 x 10¹⁰ sec
- 4.4 x 10⁸ sec

12. Period of visible light waves is

- 2 x 10¯¹¹ sec
- 2 x 10¯¹⁵ sec
**correct** - 2 x 10¯¹⁰ sec
- 2 x 10¯¹⁴ sec

13. The number 134.7 should be written as

- None of these
- 13.47 x 10³
- 1.347 x 10²
**correct** - 13.47 x 10²

14. Age of the Universe is

- 5 x 10¹⁷ sec
**correct** - 5 x 10¹⁹ sec
- 5 x 10¹⁵ sec
- None of these

15. One day is equal to

- 9.3 x 10³ sec
- None of these
- 8.6 x 10⁴ sec
**correct** - 5 x 10⁷ sec

16. Period of vibration of an atom in a solid is?

- 1 x 10¯¹⁹ sec
- 1 x 10¯¹⁶ sec
- 1 x 10¯¹³ sec
**correct** - 1 x 10¯¹⁰ sec

17. The expression of scientific notation is?

- None of these
- One non-zero digit left of decimal
**correct** - Two zeros and one non-zero digits left of the decimal
- One zero digit left of decimal

18. In the measurement 12.7 measures?

- Two accurately known digit
- Two accurately known digit and one doubtful
**correct** - One accurately known digit
- None of these

19. Steradian is the

- Three dimensional angle
**correct** - One dimensional angle
- None of these
- Two dimensional angle

20. Scientific notation which can be expressed in the

- None of these
- Negative powers
- Powers of ten
**correct** - Decimals

**Entry Test 2021 Physics Measurements MCQS Online Preparation Sample Paper 3 Questions with Answer**

1. The time taken by the light to travel from Pluto to Earth is?

- 6 hrs 20 sec
- 5 hrs 20 sec
**correct** - 76 hrs 20 sec
- 4 hrs 20 sec

2. The precision of measurement in Physics depends

- Average values and Error free instrument
- Error free instrument and Least count of instrumentcorrect
- Least count of instrument and Average values

3. In integers such as 8,000 Kg, significant zeros are determined by the instrument when least count is 1 Kg.

- 8.000 x 10³ Kg
**correct** - 8.0000 x 10³ Kg
- 8.00 x 10³ Kg
- 8.0 x 10³ Kg

4. According to equation E = mc² 1 Kg mass is actually the energy equal to

- 8 x 10¹⁵ J
- 8 x 10¹⁸ J
- 9 x 10¹⁷ J
- 9 x 10¹⁶ J
**correct**

5. The mass of Uranium atom is?

- 10¯²⁵ KG
**correct** - 10¯¹⁵ Kg
- 10¯²⁰ Kg
- 10¯¹⁰ Kg

6. For assessment of total uncertainty when percentage uncertainties are?

- Subtracted
- Added
**correct** - Multiplied
- Divided

7. For assessment of total uncertainty when added or subtracted the absolute uncertainties are?

- Multiplied
- Divided
- Subtracted
- Added
**correct**

8. Random error occurs when repeated measurements of the quantity under the same conditions gives?

- None of these
- Different values
**correct** - Equal values
- Increasing Values

9. The time taken by the light to travel from Sun to Earth is?

- 8 min 20 sec
**correct** - 5 min 20 sec
- 4 min 20 sec
- 9 min 20 sec

10. by dimensional analysis, we can find?

- Correctness of formula
- All of these
**correct** - Physical nature
- Derivation of formula

11. The dimension stands for the nature of a physical quantity which is?

- None of these
- Numerical
- Quantity
- Quantitative
**correct**

12. In colour printing, the entire range of colours uses just?

- Five colours
- None of these
- Four colours
**correct** - Three colours

13. Lightly year is measured in?

- Time
- Length
**correct** - Speech
- None of these

14. Systematic error refers to an effect that influences particular quantity for the measurements which are?

- None
- Some
- A and B
- All
**correct**

15. 8.233 m, 2:105m and 1.05 cm are the length, breadth and thickness respectively, find volume of the sheet correct upto appropriate significant digits?

- 7.15 x 10¯² m³
**correct** - 7.85 x10¯² m³
- 8.25 x 10¯³ m³
- None of these

16. The travel time of light from Moon to Earth is?

- 1 min
- 3 min 30 sec
- 1 min 20 sec
**correct** - 2 min 10 sec

17. Total mass when silver coins are added to box as 2.2 Kg, 0.01001 Kg and 0.01002 Kg correct to appropriate precision?

- 2.3 Kg
- 2.43 Kg
- 2.67 Kg
- 2.2 Kg
**correct**

18. In the assessment of total uncertainties when power factor is involved, the percentage uncertainty is?

- Added
- Divided by that power
- None of these
- Multiplied by that power
**correct**

19. We are living in the age of?

- Technology
- Information technology
**correct** - None of these
- Space age

20. Accuracy of a measurement depends on?

- Fractional uncertainty
**correct** - None of these
- Less absolutely
- Percentage uncertainty