Units And Dimensions(11th And 12th > Physics ) Questions and Answers
Explanation:-
Answer: Option D. -> 8%:
D
P=FA=Fl2, So maximum error in pressure (P)
( ΔPP×100)max=ΔFF×100+2Δl1×100
=4%+2×2%=8%
Explanation:-
Answer: Option C. -> 7%:
C
Percentage error in g=(% error in l) + 2(% error in T)=1%+2(3%)=7%
Explanation:-
Answer: Option B. -> 2 ×102 cm3:
B
Volume V = l × b × t
= 12 × 6 × 2.45 = 176.4 cm3
V = 176.4 ×102 cm3
Since, the minimum number of significant figure is one in breadth, hence volume will also contain only one significant figure. Hence, V = 2 ×102 cm3.
Explanation:-
Answer: Option C. -> a = LT−2, b = L, c = T:
C
From the principle of dimensional homogeneity [v] = [αt]⇒[α]=[LT−2]. similarly [b] = [L] and [c] = [T]
Explanation:-
Answer: Option C. -> Dimensionally correct only:
C
Given equation is dimensionally correct because both sides are dimensionless but numerically wrong because the correct equation is tan θ=v2rg.
Explanation:-
Answer: Option A. -> V=πPγ48ηl:
A
Formula for viscosity η=πPγ48Vl⇒ V = πPγ48ηl