Units and Dimensions MCQ Questions and Answers for Practice

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

1. Unit
2. Symbol
3. Instrument
4. Measurement

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

1. mean solar day
2. solar day
3. lunar day
4. day

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

1. supplementary units
2. system of units
3. complementary units
4. metric units

4. A unitless quantity

1. always has a non-zero dimension.
2. may have a non-zero dimension.
3. never has a zero dimension.
4. has no dimensions.

5. Accidental error can be minimised by

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

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

1. equality of inertial frame of reference.
2. the type of system of units.
3. the method of measurement.
4. principle of homogeneity of dimensions.

7. Constant error can be caused due to

1. faulty construction of instrument.
2. wrong setting of instrument.
3. lack of concentration of observer.
4. wrong procedure of handling the instrument

8. Dimensional equation CANNOT be used

1. to check the correctness of a physical quantity.
2. to derive the relation between different physical quantities.
3. to find out constant of proportionality which may be pure number.
4. 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

1. instrumental error
2. persistant error
3. personal error
4. random error

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

1. instrumental error
2. systematic error
3. personal error
4. random error

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

1. cesium-122 atom
2. cesium-132 atom
3. cesium-133 atom
4. cesium-134 atom

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

1. M.K.S.
2. C.G.S.
3. F.P.S.
4. S.I

13. Instrumental error can be minimised by

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

14. Light year is a unit for the measurement of

1. distance
2. time
3. temperature
4. luminous intensity

15. Maxwells equations relate to

1. law of gravitation
2. basic laws of electromagnetism
3. laws of electrostatics
4. nuclear model of an atom