The dimensions of physical quantity X in the equation Force =XDensity is given by 

(1) M1L4T2

(2) M2L2T1

(3) M2L2T2

(4) M1L2T1

Subtopic:  Dimensions |
 84%
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Two quantities A and B have different dimensions. Which mathematical operation given below is physically meaningful 

(1) A/B

(2) A + B

(3) AB

(4) None

Subtopic:  Dimensions |
 81%
From NCERT
PMT - 1997
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A force F is given by F = at + bt2, where t is time. What are the dimensions of a and b 

(1) MLT3 and ML2T4

(2) MLT3 and MLT4

(3) MLT1 and MLT0

(4) MLT4 and MLT1

Subtopic:  Dimensions |
 81%
From NCERT
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The decimal equivalent of 1/20 upto three significant figures is

(1) 0.0500

(2) 0.05000

(3) 0.0050

(4) 5.0 × 10-2

Subtopic:  Significant Figures |
 67%
From NCERT
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Accuracy of measurement is determined by

(1) Absolute error

(2) Percentage error

(3) Both

(4) None of these

Subtopic:  Significant Figures |
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The number of significant figures in all the given numbers 25.12, 2009, 4.156 and 1.217×104 is 

1. 1

2. 2

3. 3

4. 4

Subtopic:  Significant Figures |
 92%
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Assertion: Out of three measurements l = 0.7 m; l = 0.70 m and l = 0.700 m, the last one is most accurate.

Reason: In every measurement, only the last significant digit is not accurately known.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
Subtopic:  Significant Figures |
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Choose any one of the following four responses :

(1) If both assertion and reason are true and the reason is the correct explanation of the assertion.

(2) If both assertion and reason are true but the reason is not the correct explanation of the assertion.

(3) If the assertion is true but the reason is false.

(4) If the assertion and reason both are false.

Assertion: Avogadro number is the number of atoms in one gram mole.

Reason: Avogadro number is a dimensionless constant.

Subtopic:  Dimensions |
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If radius of the sphere is (5.3 ± 0.1)cm. Then percentage error in its volume will be 

(1) 3+6.01×1005.3

(2) 13×0.01×1005.3

(3) 3×0.15.3×100

(4) 0.15.3×100

Subtopic:  Errors |
 81%
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The pressure on a square plate is measured by measuring the force on the plate and the length of the sides of the plate. If the maximum error in the measurement of force and length are respectively 4% and 2%, The maximum error in the measurement of pressure is 

(1) 1%

(2) 2%

(3) 6%

(4) 8%

Subtopic:  Errors |
 70%
From NCERT
PMT - 1993
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