Class 11 Physics Chapter 2 Units and Measurements MCQ Questions with Answer

Units and Measurements Class 11 MCQ is one of the best strategies to prepare for the CBSE Class 11 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more MCQ on Units and Measurement Class 11, which will help them all through their board test.

Units and Measurements Class 11 MCQ Questions with Answer

Class 11 Physics MCQ with answers are given here to Chapter 2 Units and Measurements. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 11 Physics syllabus. By Solving these Class 11 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 11 Annual exam.

Learn Class 11 Units and Measurements MCQs with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 11 Physics Units and Measurements MCQ with answers given below

Question 1. The dimensional formula of angular velocity is
(a) [MLT–1]
(b) [M0L0T]
(c) [ML0T–2]
(d) [M0L0T–1]

D

Question 2. The unit of thermal conductivity is
(a) W m–1 K–1
(b) J m K–1
(c) J m–1 K–1
(d) W m K–1

A

Question 3. [MLT–1] + [MLT–1] = ………….   B
(a) [M°L°T°]
(b) [MLT–1]
(c) 2[MLT–1]
(d) None of these

B

Question 4. The dimensions of pressure is equal to
(a) force per unit volume
(b) energy per unit volume
(c) force
(d) energy

B

Question 5. A screw gauge has least count of 0.01 mm and there are 50 divisions in its circular scale. The pitch of the screw gauge is
(a) 0.01 mm
(b) 0.25 mm
(c) 0.5 mm
(d) 1.0 mm

C

Question 6. In an experiment, the percentage of error occurred in the measurement of physical quantities A, B, C and D are 1%, 2%, 3% and 4% respectively. Then the maximum percentage of error in the measurement X, where X = A2B1/2 /C1/3D3 will be
(a) 10%
(b) (3/13)%
(c) 16%
(d) –10%

C

Question 7. The damping force on an oscillator is directly proportional to the velocity. The units of the constant of proportionality are
(a) kg m s–1
(b) kg m s–2
(c) kg s–1
(d) kg s

C

Question 8. The unit of permittivity of free space, e0, is
(a) coulomb/newton-metre
(b) newton-metre2/coulomb2
(c) coulomb2/newton-metre2
(d) coulomb2/(newton-metre)2

C

Question 9. In an experiment, four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated as follows
P a3b2 /cd . % error in P is
(a) 7%
(b) 4%
(c) 14%
(d) 10%

C

Question 10. A student measures the distance traversed in free fall of a body, initially at rest, in a given time. He uses this data to estimate g, the acceleration due to gravity. If the maximum percentage errors in measurement of the distance and the time are e1 and e2 respectively, the percentage error in the estimation of g is
(a) e2 – e1
(b) e1 + 2e2
(c) e1 + e2
(d) e1 – 2e2

B

Question 11. The main scale of a vernier callipers has n divisions/cm. n divisions of the vernier scale coincide with (n – 1) divisions of main scale. The least count of the vernier callipers is
(a) 1 /(n+1)(n-1)cm
(b) 1/n cm
(c) 1/ncm
(d) 1 /n(n + 1) cm

C

Question 12. A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm.
The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of
–0.004 cm, the correct diameter of the ball is
(a) 0.521 cm
(b) 0.525 cm
(c) 0.053 cm
(d) 0.529 cm

D

Question 13. Percentage errors in the measurement of mass and speed are 2% and 3% respectively. The error in the estimate of kinetic energy obtained by measuring mass and speed will be
(a) 8%
(b) 2%
(c) 12%
(d) 10%.

A

Question 14. A certain body weighs 22.42 g and has a measured volume of 4.7cc. The possible error in the measurement of mass and volume are 0.01 g and 0.1 cc. Then maximum error in the density will be
(a) 22%
(b) 2%
(c) 0.2%
(d) 0.02%.

B

Question 15. If the error in the measurement of radius of a sphere is 2%, then the error in the determination of volume of the sphere will be
(a) 8%
(b) 2%
(c) 4%
(d) 6%

D

Question 16. The density of a cube is measured by measuring its mass and length of its sides. If the maximum error in the measurement of mass and lengths are 3% and 2% respectively, the maximum error in the measurement of density would be
(a) 12%
(b) 14%
(c) 7%
(d) 9%.

D

Question 17. The pair of quantities having same dimensions is
(a) Impulse and Surface Tension
(b) Angular momentum and Work
(c) Work and Torque
(d) Young’s modulus and Energy

C

Question 18. The dimensions of (m0e0)–1/2 are
(a) [L1/2T–1/2]
(b) [L–1T]
(c) [LT–1]
(d) [L1/2T1/2]

C

Question 19. Taking into account of the significant figures, what is the value of 9.99 m – 0.0099 m?
(a) 9.9801 m
(b) 9.98 m
(c) 9.980 m
(d) 9.9 m

B

Question 20. Dimensions of stress are
(a) [MLT–2]
(b) [ML2T–2]
(c) [ML0T–2]
(d) [ML–1 T–2]

D

Question 21. Which two of the following five physical parameters have the same dimensions ?
1. energy density
2. refractive index
3. dielectric constant
4. Young’s modulus 5. magnetic field
(a) 1 and 4
(b) 1 and 5
(c) 2 and 4
(d) 3 and 5

A

Question 22. The dimension of 1/2 εE2 ,where e0 is permittivity of free space and E is electric field, is
(a) ML2T–2
(b) ML–1T–2
(c) ML2T–1
(d) MLT–1

B

Question 23. If the dimensions of a physical quantity are given by MaLbTc, then the physical quantity will be
(a) velocity if a = 1, b = 0, c = – 1
(b) acceleration if a = 1, b = 1, c = – 2
(c) force if a = 0, b = – 1, c = – 2
(d) pressure if a = 1, b = –1, c = –2

D

Question 24. The dimensions of universal gravitational constant are
(a) [M–1L3T–2]
(b) [ML2T–1]
(c) [M–2L3T–2]
(d) [M–2L2T–1]

A

Question 25. The dimensions of Planck’s constant equals to that of
(a) energy
(b) momentum
(c) angular momentum
(d) power.

C

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Question 26. Dimensions of resistance in an electrical circuit, in terms of dimension of mass M, of length L, of time T and of current I, would be
(a) [ML2T–2]
(b) [ML2T–1I–1]
(c) [ML2T–3I–2]
(d) [ML2T–3I–1]

B

Question 27. The ratio of the dimensions of Planck’s constant and that of moment of inertia is the dimensions of
(a) time
(b) frequency
(c) angular momentum
(d) velocity.

B

Question 28. Which of the following dimensions will be the same as that of time?
(a) L /R
(b) C /L
(c) LC
(d) R /L

A

Question 29. Which pair do not have equal dimensions ?
(a) Energy and torque
(b) Force and impulse
(c) Angular momentum and Planck’s constant
(d) Elastic modulus and pressure.

B

Question 30. The dimensions of impulse are equal to that of
(a) pressure
(b) linear momentum
(c) force
(d) angular momentum

B

Question 31. Of the following quantities, which one has dimensions different from the remaining three ?
(a) Energy per unit volume
(b) Force per unit area
(c) Product of voltage and charge per unit volume
(d) Angular momentum.

D

Question 32. The dimensional formula of magnetic flux is
(a) [M0L–2T–2A–2]
(b) ML0T–2A–2]
(c) [ML2T–2A–1]
(d) [ML2T–1A3]

C

Question 33. The dimensions of RC is
(a) square of time
(b) square of inverse time
(c) time
(d) inverse time.

C

Question 34. Which of the following has the dimensions of pressure?
(a) [MLT–2]
(b) [ML–1T–2]
(c) [ML–2T–2]
(d) [M–1L–1]

B

Question 35. Dimensional formula of self inductance is
(a) [MLT–2A–2]
(b) [ML2T–1A–2]
(c) [ML2T–2A–2]
(d) [ML2T–2A–1]

C

Question 36. The dimensional formula of permeability of free space m0 is
(a) [MLT–2A–2]
(b) [M0L1T]
(c) [M0L2T–1A2]
(d) none of these.

A

Question 37. According to Newton, the viscous force acting between liquid layers of area A and velocity gradient Δv/ΔZ is given by F = -ηA Δv /ΔZ where h is constant called coefficient of viscosity. The dimensional formula of h is
(a) [ML–2T–2]
(b) [M0L0T0]
(c) [ML2T–2]
(d) [ML–1T–1].

D

Question 38. Planck’s constant (h), speed of light in vacuum (c) and Newton’s gravitational constant (G) are three fundamental constants. Which of the following combinations of these has the dimension of length ?
(a) √hG /c3/2
(b) √hG /c5/2
(c) √hc/G
(d) √Gc/h3/2

A

Question 39. If dimensions of critical velocity vc of a liquid flowing through a tube are expressed as [hxryrz] where h, r and r are the coefficient of viscosity of liquid, density of liquid and radius of the tube respectively, then the values of x, y and z are given by
(a) –1, –1, –1
(b) 1, 1, 1
(c) 1, –1, –1
(d) –1, –1, 1

C

Question 40. The dimensional formula of torque is
(a) [ML2T–2]
(b) [MLT–2]
(c) [ML–1T–2]
(d) [ML–2T–2].

A

Question 41. If C and R denote capacitance and resistance, the dimensional formula of CR is
(a) [M0L0T1]
(b) [M0L0T0]
(c) [M0L0T–1]
(d) not expressible in terms of MLT.

A

Question 42. The dimensional formula of angular momentum is
(a) [ML2T–2]
(b) [ML–2T–1]
(c) [MLT–1]
(d) [ML2T–1].

D

Question 43. The velocity v of a particle at time t is given by v=at + b/t+c where a, b and c are constants. The dimensions of a, b and c are
(a) [L], [LT] and [LT–2]
(b) [LT–2], [L] and [T]
(c) [L2], [T] and [LT–2]
(d) [LT–2], [LT] and [L].

B

Question 44. An equation is given here (p + a/v2) = b.Θ/V where P = Pressure, V = Volume and q = Absolute temperature. If a and b are constants, the dimensions of a will be
(a) [ML–5T–1]
(b) [ML5T1]
(c) [ML5T–2]
(d) [M–1L5T2].

C

Question 45. If force (F), velocity (V) and time (T) are taken as fundamental units, then the dimensions of mass are
(a) [FVT–1]
(b) [FVT–2]
(c) [FV–1T–1]
(d) [FV–1T]

D

Question 46. The density of a material in CGS system of units is 4 g cm–3. In a system of units in which unit of length is 10 cm and unit of mass is 100 g, the value of density of material will be
(a) 0.04
(b) 0.4
(c) 40
(d) 400

C

Question 47. The time dependence of a physical quantity p is given by p = p0 exp (–at2), where a is a constant and t is the time. The constant a
(a) is dimensionless
(b) has dimensions [T–2]
(c) has dimensions [T2]
(d) has dimensions of p

B

Question 48. Which of the following is a dimensional constant?
(a) Relative density
(b) Gravitational constant
(c) Refractive index
(d) Poisson’s ratio

B

Question 49. Turpentine oil is flowing through a tube of length l and radius r. The pressure difference between the two ends of the tube is P. The viscosity of oil is given by η= P(r2 – x2) / 4vl where v is the velocity of oil at a distance x from the axis of the tube. The dimensions of h are
(a) [M0L0T0]
(b) [MLT–1]
(c) [ML2T–2]
(d) [ML–1T–1]

D

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