Units and Dimensions MCQ Multiple Choice Questions Answers | Quiz for Practice

Q: 3. A set of fundamental and derived units is known as

Correct Answer is: system of units

Q: 4. A unitless quantity

Correct Answer is: has no dimensions.

Q: 5. Accidental error can be minimised by

Correct Answer is: selecting instrument with small least count.

Q: 6. Checking the correctness of physical equations using the method of dimensions is based on

Correct Answer is: principle of homogeneity of dimensions.

Q: 7. Constant error can be caused due to

Correct Answer is: faulty construction of instrument.

Q: 8. Dimensional equation CANNOT be used

Correct Answer is: to find out constant of proportionality which may be pure number.

Q: 9. Error due to non-removal of parallax between pointer and its image in case of magnetic compass needle causes

Correct Answer is: personal error

Q: 10. If the pointer of the voltmeter is not exactly at the zero of the scale then the error is called

Correct Answer is: systematic error

Q: 11. In cesium atomic clock ..............is used.

Correct Answer is: cesium-133 atom

Q: 13. Instrumental error can be minimised by

Correct Answer is: using different accurate instrument for the same reading.

Units and Dimensions MCQs are essential for students and exam aspirants to master the fundamental concepts of measurement and physical quantities. Practicing these questions helps in building a strong foundation and excelling in exams and interviews.

About Units and Dimensions MCQ Questions

Units and Dimensions MCQs cover a wide range of topics, including the basic units of measurement, derived units, dimensional analysis, and the principles of significant figures. These questions are designed to test your understanding of how physical quantities are measured and how they relate to one another.

Why Practice Units and Dimensions Objective Questions?

Practicing Units and Dimensions MCQs offers several benefits. It helps students and aspirants to reinforce their knowledge, prepare effectively for school and college exams, and perform well in competitive exams and interviews. Regular practice also enhances problem-solving skills and improves accuracy in calculations.

Who Should Use These MCQs?

Students preparing for school or college exams
Competitive exam aspirants
Candidates preparing for interviews

Units and Dimensions MCQ Questions for Practice

1. ..............is needed for the experimental verification of various theories.

Unit
Symbol
Instrument
Measurement

2. A ..............is the interval from one noon to the next noon.

mean solar day
solar day
lunar day
day

3. A set of fundamental and derived units is known as

supplementary units
system of units
complementary units
metric units

4. A unitless quantity

always has a non-zero dimension.
may have a non-zero dimension.
never has a zero dimension.
has no dimensions.

5. Accidental error can be minimised by

taking only one reading.
taking small magnitude of the quantity.
selecting instrument with greater least count.
selecting instrument with small least count.

6. Checking the correctness of physical equations using the method of dimensions is based on

equality of inertial frame of reference.
the type of system of units.
the method of measurement.
principle of homogeneity of dimensions.

7. Constant error can be caused due to

faulty construction of instrument.
wrong setting of instrument.
lack of concentration of observer.
wrong procedure of handling the instrument

8. Dimensional equation CANNOT be used

to check the correctness of a physical quantity.
to derive the relation between different physical quantities.
to find out constant of proportionality which may be pure number.
to change from one system of units toanother system.

9. Error due to non-removal of parallax between pointer and its image in case of magnetic compass needle causes

instrumental error
persistant error
personal error
random error

10. If the pointer of the voltmeter is not exactly at the zero of the scale then the error is called

instrumental error
systematic error
personal error
random error

11. In cesium atomic clock ..............is used.

cesium-122 atom
cesium-132 atom
cesium-133 atom
cesium-134 atom

12. In which of following system, scientific data can be exchanged between different parts of the world?

M.K.S.
C.G.S.
F.P.S.
S.I

13. Instrumental error can be minimised by

taking large number of readings.
using different accurate instrument for the same reading.
adjusting zero of the instrument.
maintaining the temperature of the surrounding.

14. Light year is a unit for the measurement of

distance
time
temperature
luminous intensity

15. Maxwells equations relate to

law of gravitation
basic laws of electromagnetism
laws of electrostatics
nuclear model of an atom

16. Nano size of gold has ..............colour.

yellow
red
pink
orange

17. Out of the following units, which is NOT a fundamental unit?

newton
second
pound
kg

18. S.I system of unit contains ..............supplementary unit.

7
2
many
4

19. Significant figures depends upon the ..............of the measuring instrument.

length
readings
number
accuracy

20. State the number of significant figures in6.032 J

21. Temperature can be expressed as a derived quantity in terms of

length and mass
mass and time
length, mass and time
none of these

22. The atomic, molecular and nuclear phenomena are the parts of ..............domain.

macroscopic
microscopic
megascopic
electroscopic

23. The difference between the true value and measured value is called

mistake
error
significant figures
fault

24. The magnitude of the difference between mean value and each individual value is called

absolute error
error in reading
most probable error
true error

25. The mass of the body depends only on

temperature.
pressure.
quantity of matter contained in the body.
location of the body from the observer

26. The number of significant figures in 0.0009 is

27. The number of significant figures in 0.0500 is

28. The number of significant figures in 0.400 is

29. The physical quantity having the same unit in all the systems of unit is

length
time
mass
foot

30. The reference standard used for the measurement of a physical quantity is called

standard quantity
dimension
constant
unit