EASY
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If NA,NB and NC are the number of significant figures in A=0.001204 m, B=43120000 m,  and C=1.200 m respectively then

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Important Questions on Units and Measurements

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The final result of the sum of the numbers 523.32,1.21524 and 107.3 rounded to correct significant figures is
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The diameter and height of a cylinder are measured by a meter scale to be 12.6±0.1cm and 34.2±0.1cm, respectively. What will be the value of its volume in appropriate significant figures?
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The area of a rectangular field (in m2) of length 55.3 m and breadth 25 m after rounding off the value for correct significant digits is:
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In an experiment, the mass of an object is measured by applying a known force on it, and then measuring its acceleration. If in the experiment, the measured values of applied force and the measured acceleration are F=10.0±0.2 N and a=1.00±0.01 m s-2, respectively, the mass of the object is
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For the four sets of three measured physical quantities as given below. Which of the following options is correct?
i A1=24.36,B1=0.0724,C1=256.2
ii A2=24.44,B2=16.082,C2=240.2
iii A3=25.2,B3=19.2812,C3=236.183
iv A4=25,B4=236.191,C4=19.5
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If one takes into account the finite mass of the proton, the correction to the binding energy of the hydrogen atom is approximately (mass of proton =1.60×10-27kg, mass of an  electron =9.10×10-31kg )
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The number of significant figures in 0.07800 is
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A cylindrical wire has a mass (0.3±0.003) g, radius (0.5±0.005) mm and length (6±0.06) cm. The maximum percentage error in the measurement of its density is
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Taking into account of the significant figures, what is the value of 9.99 m0.0099 m?
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The length and diameter of a cylinder are measured to be 10.1031 cm and 2.0935 cm respectively. The volume of the cylinder to an appropriate significant figures is
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The length and width of a rectangular room are measured to be 3.95±0.05 m and 3.05±0.05 m , respectively, the area of the floor is
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In an experiment on a simple pendulum to determine the acceleration due to gravity, the student measures the length of the thread as 63.2 cm and diameter of the pendulum bob as 2.256 cm. The student should take the length of the pendulum to be
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A physical quantity P is described by the relation P=a12 b2 c3d-4. If the relative errors in the measurement of a, bc and d respectively, are 2%, 1%, 3% and 5%. Then the relative error in P will be:

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The percentage errors in quantities P, Q, R and S are 0.5%, 1%, 3% and 1.5% respectively in the measurement of a physical quantity A= P 3 Q 2 R S . The maximum percentage error in the value of A will be:
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In a simple pendulum experiment for determination of acceleration due to gravity (g), time taken for 20 oscillations is measures by using a watch of 1 second least count. The mean value of time taken comes out to be 30 s. The length of the pendulum is measured by using a meter scale of least count 1 mm and the value obtained is 55.0 cm. The percentage error in the determination of g is close to
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If the error in the measurement of radius of a sphere is 1%, the error in the measurement of volume will be
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The resistance R=VI where, V=(100±5)V and I=(10±0.2)A. The percentage error in R is:
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The distance of a circle is 2.486 m. Its area with due regard to signifiant figures is (Given π=3.142)
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The area of a square is 5.29 cm2. The area of 7 such squares taking into account the significant figures is:
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In the following passage there are blanks, each of which has been numbered. There are questions given below the passage and for each question, four words are suggested, one of which fits the blank appropriately. Find out the appropriate word in each case.

Whenever I go into a bank, I feel scared. Everybody and everything that I see there (1) ____ me. As for the manager the sight (2) ____ him simply terrifies me and (3) ____ me want to runaway (4) _____ I can. As soon as I (5) ____ the door of the bank I lose my head (6) ____ when I try to do any (7) ____ there, I behave like an idiot. I cannot explain (8) ____ for this but that is how it (9) ____ has been that is how it is (10) ____.

Select the most appropriate option for blank No. 10.