A mixture consisting of two liquids that do not mix and settle into layers when they left undisturbed is called ……………….
A) solution
B) suspension
C) emulsion
D) none of these
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4. The value of \( \left(\frac{1}{2}\right)^{-2}+\left(\frac{1}{3}\right)^{-2}+\left(\frac{1}{4}\right)^{-2} \) is (a) \( \frac{61}{144} \) (b) \( \frac{144}{61} \) (c) 29 (d) none of these
Correct answer is:- (c) 29 Explanation:- 1/2-2 + 1/3-2 + 1/4-2 = 22 + 32 + 42 (x-1 = 1/x) = 4 + 9 + 16 = 29
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Consider a particle of mass \( m \) having linear momentum \( P \) at position \( r \) relative to the origin \( O \). Which of the following equations correctly relates \( r , P , L \) ? a) \( \left[\left(\frac{d L}{d t}\right)+r x\left(\frac{d P}{d t}\right)\right]=0 \) b) \( \left[\left(\frac{d L}{d t}\right)-r x\left(\frac{d P}{d t}\right)\right]=0 \) c) \( \left[\left(\frac{d L}{d t}\right) \times\left(\frac{d r}{d t}\right) \times P\right]=0 \) d) \( \left[\left(\frac{d L}{d t}\right)-\left(\frac{d r}{d t}\right) \times P\right]=0 \)
Correct answer is (b) We know that \(\tau\) = r × F ∵ \(\tau\) \(= \frac{dL}{dt},\) \(F = \frac{dP}{dt}\) \(\left(\frac{dL}{dt}\right) = r \times \left(\frac{dP}{dt}\right)\) \(\left(\frac{dL}{dt}\right) - r \times \left(\frac{dP}{dt}\right) = 0\)
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When mixture of liquids are spun rapidly …………. component stay at the top. This is the principle of ……………..
B) lighter, churning
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When the components of the mixture formed are uniformly distributed through out it there it is called …………….. mixture.
A) homogeneous
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When the components of the mixture formed are not distributed uniformly throughout it, then the mixture is called ……………. mixture.
B) heterogeneous
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‘A’ is a mixture. No particles are settled down when it left undisturbed for sometime. Light beam is visible through it. Guess the ‘A’.
Correct option is B) Colloid
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The effective density of a mixture of two liquids of densities ρ1 and ρ2 when they are taken with same masses …………
B) \(\cfrac{p_1p_2}{p_1+p_2}\)
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The effective density of a mixture of two liquids of densities ρ1 and ρ2 , when they are taken with same volumes is …………
A) \(\cfrac{1}2\) (ρ1 + ρ2)
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Liquids can flow easily from one place to another. So they are called …………
Correct option is C) fluids
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A,B and C can do a work in 20,45 and 120 days respectively.They started the work. A left 10 days before and B left 5 days before the completion of wor
Correct Answer - 20
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