Sunday, November 17, 2024

MCQ Physics Chapter–2: Units and Measurements, HS 1st Year

 1. Which of the following systems of units is internationally accepted for measurement?

a) CGS
b) FPS
c) MKS
d) SI

Answer: d) SI

2. What is the SI unit of luminous intensity?

a) Candela (cd)
b) Kelvin (K)
c) Mole (mol)
d) Ampere (A)

Answer: a) Candela (cd)

3. How is the unit of time, 'second', defined in the SI system?

a) By the frequency of light emitted by a cesium-133 atom
b) By the transition frequency of cesium-133 atom
c) As 1/86400th of a day
d) As the period of a pendulum

Answer: b) By the transition frequency of cesium-133 atom

4. Which of the following are the base quantities in the SI system?

a) Length, mass, time, and velocity
b) Length, mass, time, electric current, thermodynamic temperature, amount of substance, luminous intensity
c) Velocity, force, pressure, and density
d) Energy, power, and acceleration

Answer: b) Length, mass, time, electric current, thermodynamic temperature, amount of substance, luminous intensity

5. Significant figures are defined as:

a) Only the non-zero digits in a number
b) All reliable digits plus the first uncertain digit in a measurement
c) All the zeros in a measurement
d) Only the digits after the decimal point

Answer: b) All reliable digits plus the first uncertain digit in a measurement

6. The dimensional formula of force is:

a) [M L T⁻²]
b) [M L² T⁻³]
c) [M L T⁻¹]
d) [M L⁰ T⁰]

Answer: a) [M L T⁻²]

7. Which of the following equations is dimensionally consistent?

a) x = v + 1/2 at²
b) x = v × t
c) x = x₀ + v₀t + 1/2 at²
d) x = v² + 2ax

Answer: c) x = x₀ + v₀t + 1/2 at²

8. The SI unit of energy is derived as:

a) kg m s⁻²
b) kg m² s⁻²
c) m² kg s⁻³
d) kg m³ s⁻²

Answer: b) kg m² s⁻²

9. A length of 0.003450 m expressed in significant figures is:

a) 3 significant figures
b) 4 significant figures
c) 5 significant figures
d) 6 significant figures

Answer: b) 4 significant figures

10. What is the purpose of dimensional analysis?

a) To convert units
b) To check the consistency of physical equations
c) To find the precise measurement of quantities
d) To calculate uncertainties in measurements

Answer: b) To check the consistency of physical equations

11. What is the primary advantage of using SI units?

a) They are derived from the MKS system.
b) They are widely used in science and technology for consistency.
c) They use arbitrary numerical values for base quantities.
d) They are based on imperial units.

Answer: b) They are widely used in science and technology for consistency.

12. Which of the following is NOT a fundamental SI unit?

a) Newton
b) Kelvin
c) Candela
d) Mole

Answer: a) Newton

13. How many base units are there in the SI system?

a) 5
b) 6
c) 7
d) 8

Answer: c) 7

14. Which of these statements about significant figures is correct?

a) Trailing zeros in a number without a decimal point are always significant.
b) Leading zeros in a decimal number are not significant.
c) The number 0.070 has three significant figures.
d) Changing units alters the number of significant figures.

Answer: b) Leading zeros in a decimal number are not significant.

15. Which prefix represents 10−910^{-9}?

a) Milli
b) Micro
c) Nano
d) Pico

Answer: c) Nano

16. Dimensional formula for energy is:

a) [M1L1T−2][M^1L^1T^{-2}]
b) [M1L2T−2][M^1L^2T^{-2}]
c) [M1L1T−1][M^1L^1T^{-1}]
d) [M0L2T−2][M^0L^2T^{-2}]

Answer: b) [M1L2T−2][M^1L^2T^{-2}]

17. Which among the following is a derived quantity?

a) Time
b) Mass
c) Electric current
d) Velocity

Answer: d) Velocity

18. The principle of dimensional consistency means:

a) Both sides of a physical equation must have the same dimensions.
b) An equation is correct if its dimensions are consistent.
c) Only dimensionless quantities can appear in equations.
d) Physical constants must have dimensions.

Answer: a) Both sides of a physical equation must have the same dimensions.

19. A cube has a side length of 5.00 cm. What is its volume in m³, expressed with the correct significant figures?

a) 1.25×10−3 m31.25 \times 10^{-3} \, \text{m}^3
b) 1.250×10−4 m31.250 \times 10^{-4} \, \text{m}^3
c) 1.25×10−4 m31.25 \times 10^{-4} \, \text{m}^3
d) 1.250×10−3 m31.250 \times 10^{-3} \, \text{m}^3

Answer: c) 1.25×10−4 m31.25 \times 10^{-4} \, \text{m}^3

20. Which of the following equations cannot be verified using dimensional analysis?

a) v=u+atv = u + at
b) F=maF = ma
c) x=v0t+12at2x = v_0t + \frac{1}{2}at^2
d) s=ut2+12ats = ut^2 + \frac{1}{2}at

Answer: d) s=ut2+12ats = ut^2 + \frac{1}{2}at
(Dimensional analysis only checks consistency but cannot validate correctness if terms are dimensionally consistent but the equation itself is incorrect.)

21. The dimensional formula of pressure is:

a) [ML−1T−2][M L^{-1} T^{-2}]
b) [MLT−2][M L T^{-2}]
c) [M1L−2T−2][M^1 L^{-2} T^{-2}]
d) [M1L−1T0][M^1 L^{-1} T^{0}]

Answer: c) [M1L−2T−2][M^1 L^{-2} T^{-2}]

22. Which of the following measurements has the highest precision?

a) 1.000 ± 0.005
b) 1.00 ± 0.02
c) 1.000 ± 0.05
d) 1.0000 ± 0.01

Answer: a) 1.000 ± 0.005

23. The dimensional formula for the universal gravitational constant GG is:

a) [M−1L3T−2][M^{-1} L^3 T^{-2}]
b) [M−2L3T−1][M^{-2} L^3 T^{-1}]
c) [M1L−1T2][M^1 L^{-1} T^2]
d) [M1L2T−1][M^1 L^2 T^{-1}]

Answer: a) [M−1L3T−2][M^{-1} L^3 T^{-2}]

24. What is the ratio of the molar volume to atomic volume of a mole of hydrogen?

a) 10310^3
b) 10610^6
c) 10910^9
d) 101210^{12}

Answer: c) 10910^9
(Molar volume = 22.4 L22.4 \, \text{L}; Atomic volume = volume of 6.022×10236.022 \times 10^{23} hydrogen atoms; ratio is large due to the small size of atoms.)

25. What is the value of 10010^0?

a) 0
b) 1
c) 10
d) Undefined

Answer: b) 1

26. Which of these is the unit of force in the SI system?

a) Dyne
b) Joule
c) Newton
d) Pascal

Answer: c) Newton

27. If the velocity of a body is expressed as 18 km/h, what is its value in m/s?

a) 5 m/s
b) 10 m/s
c) 15 m/s
d) 18 m/s

Answer: a) 5 m/s
(Conversion: 18 km/h=18×10003600=5 m/s18 \, \text{km/h} = \frac{18 \times 1000}{3600} = 5 \, \text{m/s})

28. Which prefix represents 10−1210^{-12}?

a) Pico
b) Nano
c) Femto
d) Atto

Answer: a) Pico

29. Dimensional formula of work is the same as that of:

a) Force
b) Energy
c) Power
d) Pressure

Answer: b) Energy
(Dimensional formula: [M1L2T−2][M^1L^2T^{-2}])

30. What is the SI unit of pressure?

a) Pascal
b) Atmosphere
c) Torr
d) Bar

Answer: a) Pascal
(1 Pascal = 1 N/m21 \, \text{N/m}^2)

31. Which of the following has the smallest value of mass?

a) 1 milligram
b) 1 microgram
c) 1 nanogram
d) 1 kilogram

Answer: c) 1 nanogram
(Conversion: 1 ng=10−9 g1 \, \text{ng} = 10^{-9} \, \text{g})

32. The derived unit of power in the SI system is:

a) Joule
b) Watt
c) Newton
d) Ampere

Answer: b) Watt
(1 Watt = 1 J/s1 \, \text{J/s})

33. Which among the following is a scalar quantity?

a) Velocity
b) Force
c) Work
d) Acceleration

Answer: c) Work

34. Which of the following quantities is dimensionless?

a) Strain
b) Stress
c) Force
d) Acceleration

Answer: a) Strain
(Strain = Change in length / Original length, no units or dimensions)

35. In a measurement of 2.530 cm2.530 \, \text{cm}, the number of significant figures is:

a) 2
b) 3
c) 4
d) 5

Answer: c) 4

36. Which among the following equations is dimensionally incorrect?

a) F=maF = ma
b) v=u+atv = u + at
c) s=ut+12at2s = ut + \frac{1}{2} at^2
d) P=mv2P = \frac{m}{v^2}

Answer: d) P=mv2P = \frac{m}{v^2}
(Dimensions of PP should match [ML−1T−2][M L^{-1} T^{-2}] but do not in this case.)

37. The ratio of speed of light in vacuum to its speed in a medium is called:

a) Refractive index
b) Relative velocity
c) Phase velocity
d) Wave number

Answer: a) Refractive index

38. Which of the following describes a unit of length?

a) Angstrom
b) Kelvin
c) Mole
d) Candela

Answer: a) Angstrom
(1 Angstrom = 10−10 m10^{-10} \, \text{m})

39. If the speed of light in a vacuum is 3×108 m/s3 \times 10^8 \, \text{m/s}, what is the approximate distance traveled by light in 1 minute?

a) 18×109 m18 \times 10^9 \, \text{m}
b) 3×106 m3 \times 10^6 \, \text{m}
c) 1.8×1010 m1.8 \times 10^{10} \, \text{m}
d) 1.8×109 m1.8 \times 10^9 \, \text{m}

Answer: c) 1.8×1010 m1.8 \times 10^{10} \, \text{m}
(Calculation: 3×108 m/s×60 s=1.8×1010 m3 \times 10^8 \, \text{m/s} \times 60 \, \text{s} = 1.8 \times 10^{10} \, \text{m})

40. The product of mass and velocity is known as:

a) Force
b) Momentum
c) Energy
d) Power

Answer: b) Momentum
(Dimensional formula: [M1L1T−1][M^1L^1T^{-1}])


MCQ Physics for Class 11 with Answers: Boost Your Preparation

Looking for MCQ Physics for Class 11 with answers? You’ve come to the right place! Mastering multiple-choice questions is essential for acing your exams and strengthening your understanding of physics concepts. Here, we provide a comprehensive collection of MCQs from various chapters in Class 11 Physics, designed to help students practice effectively and excel in their studies.

Why Are MCQs Important in Physics?

  • Quick Revision: MCQs cover key topics concisely, making them perfect for last-minute prep.
  • Concept Clarity: Attempting MCQs ensures you understand fundamental concepts.
  • Exam Readiness: Most competitive exams like NEET, JEE, and others include Physics MCQs.

Class 11 Physics MCQ Topics Covered

We’ve curated MCQs from the following critical chapters in the Class 11 Physics syllabus:

  1. Physical World and Measurement

    • Example:
      Q: Which of the following is a fundamental unit in physics?
      a) Newton
      b) Kilogram
      c) Joule
      d) Watt
      Answer: b) Kilogram

  2. Kinematics

    • Example:
      Q: A particle moves in a straight line with uniform acceleration. If its initial velocity is 5 m/s, acceleration is 2 m/s², and time is 3 seconds, what is the final velocity?
      a) 5 m/s
      b) 11 m/s
      c) 10 m/s
      d) 20 m/s
      Answer: d) 20 m/s

  3. Laws of Motion

    • Example:
      Q: Newton’s first law is also known as:
      a) Law of Acceleration
      b) Law of Inertia
      c) Law of Gravitation
      d) None of these
      Answer: b) Law of Inertia

  4. Work, Energy, and Power

    • Example:
      Q: The work done by a force is zero when the angle between force and displacement is:
      a) 0°
      b) 45°
      c) 90°
      d) 180°
      Answer: c) 90°

  5. Gravitation

    • Example:
      Q: The value of acceleration due to gravity on the surface of Earth is approximately:
      a) 8.9 m/s²
      b) 9.8 m/s²
      c) 10.8 m/s²
      d) 11.8 m/s²
      Answer: b) 9.8 m/s²

Benefits of Practicing Class 11 Physics MCQs

  1. Understand Concepts Better: Solve real-life application-based problems.
  2. Time Management: Learn to solve questions faster under exam conditions.
  3. Boost Confidence: Build the confidence to face competitive exams.

Pro Tips for Solving Physics MCQs

  • Read the Question Carefully: Avoid making assumptions before fully reading.
  • Practice Regularly: Consistency is key to mastering Physics MCQs.
  • Understand Formulas: Memorize and apply the formulas correctly.
  • Eliminate Wrong Options: Narrow down choices using logic.

Start solving these MCQs for Class 11 Physics and get ready to achieve excellent results in your exams! Bookmark this page for regular updates on practice questions and their solutions.

FAQs

  1. Are these MCQs suitable for NEET or JEE aspirants?
    Yes, they are tailored to align with the syllabus of major competitive exams.
  2. Where can I download PDF versions?
    Stay tuned! A downloadable PDF link will be available soon.

Happy Learning! 🚀

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