physics MCQS
Below are 10 Multiple Choice Questions (MCQs) with answers and brief explanations, specifically from Chapter 1: Measurements of the FBISE (Federal Board of Intermediate and Secondary Education) 11th-class Physics syllabus for the 2025 exam. These MCQs are crafted to align with the FBISE syllabus, focusing on key concepts such as units, dimensions, significant figures, and errors, as outlined in the official curriculum and reflected in past papers and resources like www.taleemcity.com and www.ilmistarsacademy.com. They are designed to match the style and difficulty level of FBISE exams.
Chapter 1: Measurements - Key Topics
- SI units (base and derived)
- Dimensions and dimensional analysis
- Significant figures
- Errors (systematic and random)
- **Precision and accuracy
- Scientific notation
10 MCQs with Answers and Explanations
- Question: The SI base unit of amount of substance is:
- A) Kilogram
- B) Mole
- C) Ampere
- D) Candela
- Answer: B) Mole
- Explanation: The mole is the SI base unit for the amount of substance, measuring the number of particles (e.g., atoms, molecules) in a sample.
- Question: The dimensions of force are:
- A) [M L T⁻¹]
- B) [M L T⁻²]
- C) [M L² T⁻²]
- D) [M L T⁻³]
- Answer: B) [M L T⁻²]
- Explanation: Force = mass × acceleration = [M] × [L T⁻²] = [M L T⁻²]. This is a common dimensional analysis question.
- Question: How many significant figures are in the number 0.008070?
- A) 3
- B) 4
- C) 5
- D) 6
- Answer: B) 4
- Explanation: In 0.008070, the significant figures are 8, 0, 7, and 0 (leading zeros are not significant, but the trailing zero after 7 is).
- Question: The error in a measurement is classified as systematic if it:
- A) Occurs randomly
- B) Is due to instrument calibration
- C) Varies in magnitude
- D) Cancels out over multiple measurements
- Answer: B) Is due to instrument calibration
- Explanation: Systematic errors arise from consistent issues like faulty calibration, unlike random errors which vary unpredictably.
- Question: The derived unit of pressure in SI is:
- A) Newton
- B) Joule
- C) Pascal
- D) Watt
- Answer: C) Pascal
- Explanation: Pressure = force/area, measured in pascal (Pa = N/m²). This tests knowledge of derived units.
- Question: Which of the following quantities has the same dimensions as work?
- A) Power
- B) Momentum
- C) Energy
- D) Torque
- Answer: C) Energy
- Explanation: Work and energy both have dimensions [M L² T⁻²] (work = force × distance = [M L T⁻²][L]). Torque also has the same dimensions, but energy is the more direct match in context.
- Question: A length is measured as 5.20 cm. The number of significant figures is:
- A) 2
- B) 3
- C) 4
- D) 5
- Answer: B) 3
- Explanation: In 5.20, the significant figures are 5, 2, and 0 (the trailing zero is significant in a decimal).
- Question: The percentage error in a measurement of 10 cm with an absolute error of 0.2 cm is:
- A) 0.2%
- B) 2%
- C) 5%
- D) 10%
- Answer: B) 2%
- Explanation: Percentage error = (absolute error/measured value) × 100 = (0.2/10) × 100 = 2%.
- Question: Which of the following is a supplementary unit in the SI system?
- A) Meter
- B) Radian
- C) Kilogram
- D) Second
- Answer: B) Radian
- Explanation: Radian (for plane angle) and steradian (for solid angle) are supplementary units in SI, distinct from base and derived units.
- Question: The dimensional formula for the coefficient of viscosity is:
- A) [M L⁻¹ T⁻¹]
- B) [M L T⁻²]
- C) [M L⁻¹ T⁻²]
- D) [M L² T⁻¹]
- Answer: A) [M L⁻¹ T⁻¹]
- Explanation: Viscosity (η) is given by F = ηA(dv/dx). Dimensions: [M L T⁻²] = η [L²][L T⁻¹]/[L] → η = [M L⁻¹ T⁻¹].
Key Notes
- Syllabus Alignment: These MCQs cover core topics from Chapter 1 (Measurements) of the FBISE 11th-class Physics syllabus, including units, dimensions, significant figures, and errors, which are frequently tested in exams.
- Question Variety: The questions include conceptual, numerical, and application-based MCQs to reflect FBISE’s exam pattern.
- Explanations: Brief explanations clarify the reasoning, aiding quick understanding and revision.
Recommended Resources for Additional MCQs
For more MCQs on Chapter 1 (Measurements):
- FBISE Official Website (www.fbise.edu.pk):
- Access past papers (2016–2024) under “Examinations” > “Past Papers.” Chapter 1 MCQs often appear in the objective section.
- Taleem City (www.taleemcity.com):
- Offers solved MCQs for Chapter 1 in PDF format, tailored for FBISE syllabus.
- Ilmi Stars Academy (www.ilmistarsacademy.com):
- Provides chapter-specific MCQs with answers and video explanations.
- Download Class Notes (www.downloadclassnotes.com):
- Contains solved MCQs for Measurements in downloadable PDFs.
- Pak Learning Spot (www.paklearningspot.com):
- Features free MCQs for FBISE board exams, including Chapter 1.
How to Access:
- Visit these websites, navigate to the 11th-class Physics section, and select “Chapter 1 MCQs” or “Measurements.”
- Past papers are available on the FBISE website in PDF format, free of charge.
Tips for MCQ Preparation
- Focused Practice: Solve 10–15 MCQs daily for Chapter 1 to master concepts like significant figures and dimensional analysis.
- Time Yourself: Aim for ~1 minute per MCQ to build exam speed.
- Review Errors: Use answer keys to understand mistakes and revisit concepts like error calculation.
- Combine with Theory: Pair MCQ practice with textbook reading (FBISE Physics textbook, available on www.taleem360.com) for deeper understanding.
Additional Support
These 10 MCQs are tailored to help you prepare for the 2025 FBISE exam. If you need:
- More MCQs for Chapter 1 (Measurements).
- MCQs for other chapters or specific topics (e.g., dimensions, errors).
- Assistance downloading resources or solving numericals. please let me know, and I’ll provide further tailored support. Good luck with your Physics exam preparation!
=========
Below are 10 Multiple Choice Questions (MCQs) with answers and brief explanations, specifically from Chapter 2: Vectors and Equilibrium of the FBISE (Federal Board of Intermediate and Secondary Education) 11th-class Physics syllabus for the 2025 exam. These MCQs are designed to align with the FBISE syllabus, focusing on key concepts such as vector addition, resolution, equilibrium conditions, and torque, as outlined in the official curriculum and reflected in past papers and resources like www.taleemcity.com and www.ilmistarsacademy.com. They are crafted to match the style and difficulty level of FBISE exams.
Chapter 2: Vectors and Equilibrium - Key Topics
- Vectors: Scalar vs. vector quantities, addition (graphical and analytical), resolution of vectors.
- Equilibrium: First and second conditions of equilibrium (net force = 0, net torque = 0).
- Torque: Calculation and applications.
- Vector components: Rectangular components, dot and cross products (basic concepts).
10 MCQs with Answers and Explanations
- Question: Which of the following is a vector quantity?
- A) Mass
- B) Temperature
- C) Displacement
- D) Energy
- Answer: C) Displacement
- Explanation: Displacement has both magnitude and direction, making it a vector quantity, unlike mass, temperature, and energy, which are scalars.
- Question: Two vectors of equal magnitude 5 N act at an angle of 90°. The magnitude of their resultant is:
- A) 5 N
- B) 7.07 N
- C) 10 N
- D) 25 N
- Answer: B) 7.07 N
- Explanation: For vectors A = B = 5 N at 90°, resultant R = √(A² + B² + 2AB cosθ) = √(5² + 5² + 0) = √50 ≈ 7.07 N.
- Question: The rectangular components of a vector are 3i and 4j. The magnitude of the vector is:
- A) 5
- B) 7
- C) 12
- D) 25
- Answer: A) 5
- Explanation: Magnitude = √(x² + y²) = √(3² + 4²) = √(9 + 16) = √25 = 5.
- Question: A body is in equilibrium if:
- A) Net force is zero but net torque is non-zero
- B) Net torque is zero but net force is non-zero
- C) Both net force and net torque are zero
- D) Net force and net torque are both non-zero
- Answer: C) Both net force and net torque are zero
- Explanation: For complete equilibrium (translational and rotational), both the first condition (ΣF = 0) and second condition (Στ = 0) must be satisfied.
- Question: The torque produced by a force is maximum when the angle between the force and lever arm is:
- A) 0°
- B) 45°
- C) 90°
- D) 180°
- Answer: C) 90°
- Explanation: Torque τ = F × r × sinθ. It is maximum when sinθ = 1, i.e., θ = 90°.
- Question: If two vectors are perpendicular, their dot product is:
- A) Zero
- B) One
- C) Equal to their magnitudes
- D) Negative
- Answer: A) Zero
- Explanation: The dot product A·B = AB cosθ. For perpendicular vectors (θ = 90°), cos90° = 0, so A·B = 0.
- Question: A force of 10 N is applied at an angle of 30° to the horizontal. Its horizontal component is:
- A) 5 N
- B) 8.66 N
- C) 10 N
- D) 12 N
- Answer: B) 8.66 N
- Explanation: Horizontal component = F cosθ = 10 × cos30° = 10 × (√3/2) ≈ 8.66 N.
- Question: The resultant of two equal forces of magnitude F acting at an angle of 60° is:
- A) F
- B) √2 F
- C) √3 F
- D) 2F
- Answer: C) √3 F
- Explanation: Resultant R = √(F² + F² + 2FF cos60°) = √(2F² + F²) = √(3F²) = √3 F.
- Question: A body is in translational equilibrium if:
- A) Its velocity is constant
- B) The sum of forces acting on it is zero
- C) The sum of torques is zero
- D) Its acceleration is constant
- Answer: B) The sum of forces acting on it is zero
- Explanation: Translational equilibrium requires ΣF = 0 (first condition of equilibrium), ensuring no net acceleration.
- Question: The angle between two vectors A and B is 180°. Their resultant has a magnitude of:
- A) A + B
- B) A - B
- C) √(A² + B²)
- D) AB
- Answer: B) A - B
- Explanation: For θ = 180°, resultant R = √(A² + B² + 2AB cos180°) = √(A² + B² - 2AB) = |A - B| (magnitude).
Key Notes
- Syllabus Alignment: These MCQs cover core topics from Chapter 2 (Vectors and Equilibrium) of the FBISE 11th-class Physics syllabus, including vector addition, resolution, equilibrium, and torque, which are high-weightage topics in exams.
- Question Variety: The questions include conceptual, numerical, and application-based MCQs to reflect FBISE’s exam pattern, with emphasis on vector calculations and equilibrium conditions.
- Explanations: Brief explanations clarify the reasoning, aiding quick understanding and revision.
Recommended Resources for Additional MCQs
For more MCQs on Chapter 2 (Vectors and Equilibrium):
- FBISE Official Website (www.fbise.edu.pk):
- Access past papers (2016–2024) under “Examinations” > “Past Papers.” Chapter 2 MCQs are common in the objective section.
- Taleem City (www.taleemcity.com):
- Offers solved MCQs for Chapter 2 in PDF format, tailored for FBISE syllabus.
- Ilmi Stars Academy (www.ilmistarsacademy.com):
- Provides chapter-specific MCQs with answers and video explanations.
- Download Class Notes (www.downloadclassnotes.com):
- Contains solved MCQs for Vectors and Equilibrium in downloadable PDFs.
- Pak Learning Spot (www.paklearningspot.com):
- Features free MCQs for FBISE board exams, including Chapter 2.
How to Access:
- Visit these websites, navigate to the 11th-class Physics section, and select “Chapter 2 MCQs” or “Vectors and Equilibrium.”
- Past papers are available on the FBISE website in PDF format, free of charge.
Tips for MCQ Preparation
- Focused Practice: Solve 10–15 MCQs daily for Chapter 2 to master concepts like vector resolution and torque calculations.
- Time Yourself: Aim for ~1 minute per MCQ to build exam speed.
- Review Errors: Use answer keys to understand mistakes and revisit concepts like equilibrium conditions.
- Combine with Numericals: Pair MCQ practice with numerical problems (e.g., resultant force, torque) from the FBISE textbook (available on www.taleem360.com).
Additional Support
These 10 MCQs are tailored to support your preparation for the 2025 FBISE exam. If you need:
- More MCQs for Chapter 2 (Vectors and Equilibrium).
- MCQs for other chapters or specific topics (e.g., torque, vector addition).
- Assistance downloading resources or solving numericals. please let me know, and I’ll provide further tailored support. Good luck with your Physics exam preparation!
- =====================================================================
Below are 10 Multiple Choice Questions (MCQs) with answers and brief explanations, specifically from Chapter 3: Motion and Force of the FBISE (Federal Board of Intermediate and Secondary Education) 11th-class Physics syllabus for the 2025 exam. These MCQs are designed to align with the FBISE syllabus, focusing on key concepts such as Newton’s laws, projectile motion, momentum, and impulse, as outlined in the official curriculum and reflected in past papers and resources like www.taleemcity.com and www.ilmistarsacademy.com. They are crafted to match the style and difficulty level of FBISE exams.
Chapter 3: Motion and Force - Key Topics
- Kinematics: Equations of motion, uniformly accelerated motion.
- Newton’s Laws of Motion: First, second, and third laws.
- Momentum and Impulse: Conservation of momentum.
- Projectile Motion: Range, time of flight, maximum height.
- Friction and Tension: Forces in real-world scenarios.
10 MCQs with Answers and Explanations
- Question: According to Newton’s first law of motion, a body remains at rest or in uniform motion unless acted upon by:
- A) Gravity
- B) A net external force
- C) Friction
- D) Momentum
- Answer: B) A net external force
- Explanation: Newton’s first law (law of inertia) states that a body’s state of rest or uniform motion persists unless a net external force acts on it.
- Question: A car accelerates from 10 m/s to 20 m/s in 5 seconds. Its acceleration is:
- A) 1 m/s²
- B) 2 m/s²
- C) 4 m/s²
- D) 5 m/s²
- Answer: B) 2 m/s²
- Explanation: Acceleration a = (v - u)/t = (20 - 10)/5 = 10/5 = 2 m/s².
- Question: The momentum of a 5 kg object moving at 4 m/s is:
- A) 10 kg·m/s
- B) 20 kg·m/s
- C) 25 kg·m/s
- D) 40 kg·m/s
- Answer: B) 20 kg·m/s
- Explanation: Momentum p = mv = 5 × 4 = 20 kg·m/s.
- Question: In projectile motion, the horizontal component of velocity at the highest point is:
- A) Zero
- B) Equal to initial velocity
- C) Equal to vertical velocity
- D) Constant
- Answer: D) Constant
- Explanation: In projectile motion, the horizontal velocity remains constant throughout the motion, as no horizontal acceleration acts (ignoring air resistance).
- Question: A force of 50 N acts on a 10 kg mass. The acceleration produced is:
- A) 2 m/s²
- B) 5 m/s²
- C) 10 m/s²
- D) 50 m/s²
- Answer: B) 5 m/s²
- Explanation: Newton’s second law: a = F/m = 50/10 = 5 m/s².
- Question: The impulse of a force is equal to:
- A) Force × time
- B) Force × distance
- C) Mass × acceleration
- D) Mass × velocity
- Answer: A) Force × time
- Explanation: Impulse = F × t, which equals the change in momentum (Δp).
- Question: A projectile is launched at 45°. The angle at which it achieves maximum range is:
- A) 30°
- B) 45°
- C) 60°
- D) 90°
- Answer: B) 45°
- Explanation: The range of a projectile is maximum when launched at 45°, as R = (u² sin2θ)/g is maximized when sin2θ = 1 (θ = 45°).
- Question: Newton’s third law of motion states that:
- A) Force is proportional to acceleration
- B) Every action has an equal and opposite reaction
- C) A body at rest remains at rest
- D) Momentum is conserved
- Answer: B) Every action has an equal and opposite reaction
- Explanation: Newton’s third law describes action-reaction pairs, where forces are equal in magnitude and opposite in direction.
- Question: A 2 kg object moving at 6 m/s collides with a stationary 3 kg object and stops. The velocity of the 3 kg object after collision is:
- A) 2 m/s
- B) 4 m/s
- C) 6 m/s
- D) 8 m/s
- Answer: B) 4 m/s
- Explanation: Using conservation of momentum: m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂. So, 2 × 6 + 3 × 0 = 2 × 0 + 3 × v₂ → 12 = 3v₂ → v₂ = 4 m/s.
- Question: The time of flight of a projectile depends on:
- A) Horizontal velocity
- B) Vertical component of velocity
- C) Mass of the projectile
- D) Air resistance
- Answer: B) Vertical component of velocity
- Explanation: Time of flight T = (2u sinθ)/g depends on the vertical component of velocity (u sinθ), not horizontal velocity or mass.
Key Notes
- Syllabus Alignment: These MCQs cover core topics from Chapter 3 (Motion and Force) of the FBISE 11th-class Physics syllabus, including Newton’s laws, projectile motion, momentum, and impulse, which are high-weightage topics in exams.
- Question Variety: The questions include conceptual, numerical, and application-based MCQs to reflect FBISE’s exam pattern, with emphasis on kinematics and dynamics.
- Explanations: Brief explanations clarify the reasoning, aiding quick understanding and revision.
Recommended Resources for Additional MCQs
For more MCQs on Chapter 3 (Motion and Force):
- FBISE Official Website (www.fbise.edu.pk):
- Access past papers (2016–2024) under “Examinations” > “Past Papers.” Chapter 3 MCQs are common in the objective section.
- Taleem City (www.taleemcity.com):
- Offers solved MCQs for Chapter 3 in PDF format, tailored for FBISE syllabus.
- Ilmi Stars Academy (www.ilmistarsacademy.com):
- Provides chapter-specific MCQs with answers and video explanations.
- Download Class Notes (www.downloadclassnotes.com):
- Contains solved MCQs for Motion and Force in downloadable PDFs.
- Pak Learning Spot (www.paklearningspot.com):
- Features free MCQs for FBISE board exams, including Chapter 3.
How to Access:
- Visit these websites, navigate to the 11th-class Physics section, and select “Chapter 3 MCQs” or “Motion and Force.”
- Past papers are available on the FBISE website in PDF format, free of charge.
Tips for MCQ Preparation
- Focused Practice: Solve 10–15 MCQs daily for Chapter 3 to master concepts like projectile motion and momentum conservation.
- Time Yourself: Aim for ~1 minute per MCQ to build exam speed.
- Review Errors: Use answer keys to understand mistakes and revisit concepts like Newton’s laws.
- Combine with Numericals: Pair MCQ practice with numerical problems (e.g., projectile range, impulse) from the FBISE textbook (available on www.taleem360.com).
Additional Support
These 10 MCQs are tailored to support your preparation for the 2025 FBISE exam. If you need:
- More MCQs for Chapter 3 (Motion and Force).
- MCQs for other chapters or specific topics (e.g., projectile motion, Newton’s laws).
- Assistance downloading resources or solving numericals. please let me know, and I’ll provide further tailored support. Good luck with your Physics exam preparation!
=================================================================
Comments
Post a Comment