CBSE Important Chapter 1 Questions for Class 11 Physics
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Top 50 Units and Measurements Assignment Questions – Class 11 Physics Chapter 1
Today we discuss about Assignment Top 50 Units and Measurements questions in MCQ format, specially designed for Class 11 Physics Chapter 1 Units and Measurements important questions with answers. This guide also provides Units and Measurements Class 11 important questions with answers PDF, along with Units and Measurements Class 11 numericals with solutions PDF download for thorough practice. To boost your exam preparation, we have compiled a Units and Measurements Class 11 question bank PDF and Units and Measurements Class 11 PDF notes that cover every concept in detail. You can also revise with Units and Measurements Class 11 previous year questions and access a complete Units and Measurements Class 11 PDF download for offline study. With these resources, mastering Chapter 1 becomes easier and exam-ready.
NCERT Class 11 Physics Chapter 1 Units and Dimensions Assignment
Q1. Light year is a unit of
a) Time
b) Mass
c) Distance
d) Energy
Q2. The magnitude of any physical quantity
a) Depends on the method of measurement
b) Does not depend on the method of measurement
c) Is more in SI system than in CGS system
d) Directly proportional to the fundamental units of mass, length and time
Q3. One second is defined as
a) 1650763.73 time periods of clock
b) 652189.63 time periods of clock
c) 1650763.73 time periods of clock
d) 9192631770 time periods of cesium clock
Q4. Tesla is a unit for measuring
a) Magnetic moment
b) Magnetic induction
c) Magnetic intensity
d) Magnetic pole strength
Q5. Universal time is based on
a) Rotation of the earth on its axis
b) Earth’s orbital motion around the Sun
c) Vibrations of cesium atom
d) Oscillations of quartz crystal
Q6. Candela is the unit of
a) Electric intensity
b) Luminous intensity
c) Sound intensity
d) None of these
Q7. Which of the following pairs is wrong?
a) Pressure – Barometer
b) Relative density – Pyrometer
c) Temperature – Thermometer
d) Earthquake – Seismograph
Q8. Select the pair whose dimensions are same:
a) Pressure and stress
b) Stress and strain
c) Pressure and force
d) Power and force
Q9. Dimensional formula for angular momentum is
a) ML²T⁻¹
b) MLT⁻²
c) ML²T⁻²
d) MLT
Q10. The dimensional formula for impulse is same as that of
a) Momentum
b) Force
c) Torque
d) Pressure
Q11. Planck’s constant has the dimensions of
a) Energy
b) Linear momentum
c) Work
d) Angular momentum
Q12. Of the following, which one has dimensions different from the other three?
a) Energy per unit volume
b) Force per unit area
c) Product of voltage and charge per unit volume
d) Angular momentum per unit mass
Q13. The fundamental quantities that have same dimensions in torque and angular momentum are
a) Mass, time
b) Time, length
c) Mass, length
d) Time, mole
Q14. Dimensions of luminous flux are
a) ML²T⁻³
b) MLT⁻²
c) L²MT⁻³
d) M⁰L²T⁰
Q15. Which of the following pairs does not have similar dimensions?
a) Stress and pressure
b) Angle and strain
c) Tension and surface tension
d) Planck’s constant and angular momentum
Q16. The unit of surface tension may be expressed as
a) N·m
b) N·m⁻²
c) N·m²
d) N·m⁻¹
Q17. Which of the following does not have Nm⁻² as unit?
a) Pressure
b) Stress
c) Strain
d) Young’s modulus
Q18. Which of the following does not possess same dimensions as the other three?
a) Frequency
b) Velocity gradient
c) Angular speed
d) Potential gradient
Q19. If a vernier callipers has negative zero error, then zero correction is
a) Positive
b) Negative
c) May be positive
d) May be negative
Q20. The lag between linear motion of the screw and circular motion of screw gauge head is called
a) Ratchet error
b) Ratchet correction
c) Backlash error
d) Backlash correction
Q21. If the unit of length and force are increased four times, then the unit of energy is
a) Increased 4 times
b) Increased 8 times
c) Increased 16 times
d) Decreased 16 times
Q22. A small steel ball of radius r falls through a viscous liquid of coefficient η. Its terminal velocity depends on:
a) mg/ηr
b) η/mgr
c) r²g/η
d) mgr/η
Q23. If inductance = L and resistance = R, the dimensions of L/R are
a) T
b) M
c) L
d) Cannot be represented
Q24. If capacitance = C and resistance = R, the dimensions of CR are
a) T
b) M
c) L
d) None of these
Q25. The dimensional formula for modulus of rigidity is
a) ML⁻¹T⁻²
b) ML²T⁻²
c) MLT⁻²
d) M⁰LT
Q26. If velocity, acceleration and force are chosen as fundamental units, then the dimensional formula of angular momentum in terms of v, A, F is
a) AvF⁻¹
b) AFv⁻¹
c) A²Fv
d) AFv²
Q27. A force is given by F = a + bt, where t is time. Dimensions of a and b are:
a) a = MLT⁻² , b = MLT⁻³
b) a = MLT⁻² , b = MLT⁻¹
c) a = ML²T⁻² , b = MT⁻²
d) a = MLT , b = MLT⁻²
Q28. If speed of light = c, acceleration due to gravity = g, and pressure = p are taken as fundamental units, then dimensions of gravitational constant G are
a) p²g⁻²c⁰
b) pgc⁻²
c) g⁻³c
d) pgc
Q29. If time period of a vibrating liquid drop depends on surface tension (S), radius (r), and density (ρ), then T =
a) (ρr³/S)¹/²
b) (ρ/Sr)¹/³
c) (ρr/S)¹/²
d) None
Q30. The dimensions of inter-atomic force constant (k) are
a) MLT⁻²
b) MT⁻²
c) ML²T⁻²
d) M⁰LT⁻²
Q31. One of the combinations from the fundamental physical constants is hc/G. The unit of this expression is
a) kg²
b) m³
c) s⁻¹
d) m
Q32. If the error in the measurement of the radius is 2%, then the error in the determination of the volume of the sphere will be
a) 8%
b) 2%
c) 4%
d) 6%
Q33. If the length and time period of an oscillating pendulum have errors of 1% and 3% respectively, then the error in measurement of the acceleration due to gravity is
a) 4%
b) 5%
c) 6%
d) 7%
Q34. The length of a body is measured as 3.51 m. If the accuracy is 0.01 m, then the percentage error in the measurement is
a) 351%
b) 1%
c) 0.28%
d) 0.035%
Q35. Which of the following has the highest number of significant figures?
a) 0.007 m²
b) 2.64 × 10²⁴ kg
c) 0.0006032
d) 6.3200 J
Q36. If π = 3.14, then the value of π² is
a) 9.8596
b) 9.860
c) 9.86
d) 9.9
Q37. Which of the following pairs of physical quantities have same dimension?
a) Force and power
b) Torque and energy
c) Torque and power
d) Force and torque
Q38. The dimensional formula of Planck's constant h is
a) [ML²T⁻¹]
b) [ML²T⁻³]
c) [MLT⁻¹]
d) [ML³T⁻³]
Q39. The velocity of a particle v at an instant t is given by v = at + bt². The dimensions of b are
a) [L]
b) [LT⁻¹]
c) [LT⁻²]
d) [LT⁻³]
Q40. The dimensional formula for gravitational constant G is
a) [ML³T⁻²]
b) [M⁻¹L³T⁻²]
c) [M⁻¹L⁻³T⁻²]
d) [ML⁻³T²]
Q41. 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
Q42. If the force is proportional to square of velocity, then the dimension of proportionality constant is
a) [MLT⁰]
b) [MLT⁻¹]
c) [ML⁻²T]
d) [ML⁻¹T⁰]
Q43. The dimension of (μ₀ε₀ )⁻¹/² is
a) Length
b) Time
c) Velocity
d) Force
Q44. On the basis of dimensional equation, the maximum number of unknowns that can be found is
a) One
b) Two
c) Three
d) Four
Q45. If v stands for velocity of sound, E is elasticity and d the density, then find x in the equation v = (d/E)ˣ
a) 1
b) ½
c) 2
d) –½
Q46. The multiplication of 10.610 with 0.210 up to the correct number of significant figures is
a) 2.2281
b) 2.228
c) 2.22
d) 2.2
Q47. The measurement of the radius of a circle has an error of 1%. The error in measurement of its area is
a) 1%
b) 2%
c) 3%
d) None of these
Q48. Dimensional formula of latent heat is
a) M⁰L²T⁻²
b) MLT⁻²
c) ML²T⁻²
d) ML²T²
Q49. In case of measurement of ‘g’, if error in measurement of length of pendulum is 2% and error in time period is 1%, then the maximum error in measurement of g is
a) 1%
b) 2%
c) 4%
d) No error
Q50. If the length of the pendulum is increased by 2%, the time period will
a) Increase by 1%
b) Decrease by 1%
c) Increase by 2%
d) Decrease by 2%
CBSE Class 11 Physics Chapter 1 Units and Measurements Assignments Answers
Q1.c Q2.b Q3.d Q4.b Q5.a Q6.b Q7.b Q8.a Q9.a Q10.a
Q11.d Q12.d Q13.c Q14.d Q15.c Q16.d Q17.c Q18.d Q19.a Q20.c
Q21.c Q22.c Q23.a Q24.a Q25.a Q26.d Q27.a Q28.b Q29.a Q30.b
Q31.a Q32.d Q33.d Q34.c Q35.d Q36.c Q37.b Q38.a Q39.d Q40.b
Q41.c Q42.d Q43.c Q44.c Q45.d Q46.c Q47.b Q48.c Q49.d Q50.a
