Assertion : Number of significant figures in 0.005 is one and that in 0.500 is three.
Reason : This is because zeros are not significant.
Assertion (A): | Out of three measurements \(l=0.7\) m; \(l=0.70\) m and \(l=0.700\) m, the last one is most accurate. |
Reason (R): | In every measurement, only the last significant digit is not accurately known. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
Assertion: Mass, length and time are fundamental physical quantities.
Reason: They are independent of each other.
Assertion : Density is a derived physical quantity.
Reason : Density cannot be derived from the fundamental physical quantities.
Assertion: Nowadays a standard metre is defined in terms of the wavelength of light.
Reason: Light has no relation with length.
Assertion: Surface tension and surface energy have the same dimensions.
Reason: Because both have the same S.I. unit
Assertion : In is dimensionless.
Reason : Because dimension of
Assertion : Radian is the unit of plane angle.
Reason : One radian is the angle subtended at the centre of a circle by an arc equal in length to the radius of the circle.
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 reason is not the correct explanation of the assertion.
(3) If assertion is true but reason is false.
(4) If the assertion and reason both are false
Assertion : A.U. is much bigger than Å.
Reason : A.U. stands for astronomical unit and Å stands from Angstrom.
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: When we change the unit of measurement of a quantity, its numerical value changes.
Reason: Smaller the unit of measurement smaller is its numerical value.