Measurements

11.

In any measurement the significant figures are

A.	all accurately known and all doubtful digits	B.	only accurately known digits
C.	only doubtful digits	D.	all accurately known digits and the first doubuful digit

12.

A digit zero in a measurement

A.	may be significant may not significant	B.	always significant
C.	always insignificantsig	D.	significant only if left to a significant figure

13.

Number of significant figures in 0.0173 are

A.	three	B.	four
C.	five	D.	two

14.

Smaller the least count of the instrument more is the measurement

A.	accurate	B.	precise
C.	accurate and precise	D.	none of these

15.

The dimension of force is

A.	MLT-1	B.	MLT-2
C.	ML-1T	D.	ML-1T-2

16.

ML-1 T-2 is the dimension of

A.	force	B.	pressure
C.	momentum	D.	energy

17.

Dimensional analysis is helpful for

A.	deriving a possible formula	B.	checking the homogeneity of a physical equation
C.	verification of laws	D.	only a and b are correct

18.

Which equation is not dimensionally correct?

A.	E=mc2	B.	Vf=Vi+at
C.	S=Vt2	D.	S=1/2at2

19.

SI unit of coefficient of viscosity is

A.	Kg.m.S-1	B.	Kg m-1.S-1
C.	Kg.m.S	D.	Kg-1.m-1.S-1

20.

Three students measured length of a needle with meter rod and recorded as : (i) 0.2145m (ii) 0.21m (iii) 0.214m Which one is correct record?

A.	only (i)	B.	only (ii)
C.	only (iii)	D.	both (i) and (ii)

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