STANDARD Physics Units And Measurement Class 11 Questions

The ratio of one micron to one nanometre is

In a particular system the units of length mass and time are chosen to be 10 cm, 10 g and 0.1 s respectively. The unit of force in this system will be equal to

If the error in measuring the radius of the sphere is 2% and that in measuring its mass is 3%, then the error in measuring the density of material of the sphere is

If Z = A⁴B¹/³ / CD³/² and ΔA, ΔB, ΔC and ΔD are their absolute errors in A, B, C and D respectively. The relative error in Z is:

The temperatures of two bodies measured by a thermometer are t₁ = 20°C ± 0.5°C and t₂ = 50°C ± 0.5°C. The temperature difference and the error in the result is

Percentage errors in the measurement of mass and speed are 2% and 3% respectively. The error in the estimation of kinetic energy obtained by measuring mass and speed will be

A physical quantity X is related to four measurable quantities a, b, c and d as given, X = a²b³c⁵/2d⁻². The percentage error in the measurement of a, b, c and d are 1%, 2%, 2% and 4% respectively. What is the percentage error in quantity X?

Which of the following statements is incorrect regarding significant figures?

A cube has a side of length 1.2 × 10⁻² m. Its volume upto correct significant figures is

The radius of a sphere is 1.41 cm. Its volume to an appropriate number of significant figures is

The mass of a box measured by a grocer's balance is 2.3 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. The total mass of the box is

The numbers 3.845 and 3.835 on rounding off to 3 significant figures will give

The respective number of significant figures for the numbers 6.320, 6.032, 0.0006032 are

The number of significant figures in the numbers 4.8000 × 10⁴ and 48000.50 are respectively

A body travels uniformly a distance of (13.8 ± 0.2) m in a time (4.0 ± 0.3) s. Its velocity with error limits is

Which of the following physical quantities has a unit but no dimensions?

Which of the following physical quantities has both unit & dimensions?

A dimensionless quantity

Which of the following pairs of physical quantities have same dimensions?

If P, Q, R are physical quantities, having different dimensions, which of the following combinations can never be a meaningful quantity?

Which of the following sets have different dimensions?

The dimensional formula of electric potential is

The dimensional formula of physical quantity is [M⁰L⁰T⁻¹]. Then that physical quantity is

Using the principle of homogeneity of dimensions, which of the following is correct?

MATCH THE QUANTITIES HAVING SAME DIMENSIONS IN COLUMN -1 AND COLUMN -2 : COLUMN 1 (A) Stress (B) Strain (C) Modulus of elasticity (D) Torque COLUMN 2 (P) Pressure (Q) Energy density (R) Angle (S) Energy

A new system of units is proposed in which unit of mass is α kg, unit of length is β m and unit of time is γ s. What will be value of 5 J in this new system?

Which of the following units is a unit of power?

The velocity of a particle (v) at an instant t is given by v = at + bt². The dimension of b is

The numbers 2.745 and 2.735 on rounding off to 3 significant figures will give

The length and breadth of a rectangular sheet are 16.2 cm and 10.1 cm, respectively. The area of the sheet in appropriate significant figures and error is

Which of the following pairs of physical quantities does not have same dimensional formula?

Measure of two quantities along with the precision of respective measuring instrument is A = 2.5 m s⁻¹ ± 0.5 m s⁻¹, B = 0.10 s ± 0.01 s. The value of AB will be

If momentum (p), area (A) and time (t) are taken to be fundamental quantities, then energy has dimensional formula