UNITS AND DIMENSIONS

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THIS IS A MCQ BASED TEST OF DURATION 30 MINUTES

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NAME *

SECTION *

1.Which statement is correct *

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a) An instrument cannot be precise without being accurate

b) The measurements can be accurate without being precise.

c) An instrument can be precise without being accurate

d) Accuracy and precision is same

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3.In the measurement of acceleration due to gravity *

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a) System errors are due to large amplitude, air friction and errors in the measurement of length and time

b) random errors are absent

c) random errors are present.

d) Both a and c

4.Least count of an instruments is defined as *

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a) Minimum value which can be accurately measured

b) Maximum value which can be accurately measured

c) Difference between maximum and minimum reading

d) Mean value of reading taken

5.The respective number of significant figures for numbers 23.023,0.0003 and 2.1 x 1000 are a) 4,4,2 b)5,1,2 c)5,1,5 d)5,5,2 *

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6.weight of a body is measure of gravity which statement is not correct for it. *

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a. It is vector

b. It varies from place to place

c. It is an essential property

d. It is affected by the presence of other bodies.

7.The least count of a meter scale is 1mm. Which of the following length is measured by the meter scale? *

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a) 2.1mm

b) 2.8cm

c) 2.801cm

d) 2.83cm

8.Choose correct statement *

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a) systematic error can be removed completely

b) Random errors can be removed completely

c) The cause of random errors are certain

d) Random errors can be removed by taking arithematic mean of all observations.

9 *

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10 *

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11 *

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12 *

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L/L

L x L

13 *

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14 *

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T,T

T,L

L,T

L,L

15 *

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16 *

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0.07

0.007

17. Time is related to acceleration due to gravity,length and mass what will be the power of [ M,L,T] as a,b,c respectively. *

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a=1,b=2,c=1

a=0, b=1/2,c=-1/2

a=1/2,b=0,c=-1/2

a=2,b=1,c=1

18 *

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a=0,b=0,c=0

a=1,b=1,c=0

a=1,b=1,c=1

a=1,b=1/2,c=1/2

19. Physical quantities with same dimensions are *

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force,energy

acceleration ,specific gravity

energy,work

work,power

20.Which is not the limitation of dimensional analysis. *

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Dimensionless constants occurring in a physical formula cannot be determined by dimensional analysis.

Dimensional analysis can be used to derive the exact form of a physical relation if it consists of more than one term

cannot be used to derive relations involving trigonometrical

Dimensionless quantities can not be determined in relation

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