📘 Chapter 5: Work and Energy – Multiple Choice Questions
Prepared by Muhammad Tayyab, Subject Specialist Physics, Govt Christian High School Daska. Based on PECTAA 2026 syllabus (National Curriculum 2023).
📖 What's Inside: This section covers multiple choice questions from Chapter 5 Work and Energy including Work, Kinetic Energy, Potential Energy, Power, Efficiency, Conservation of Energy, and Renewable Energy Sources. Each question includes an explanation of the correct answer as per the official PECTAA 2026 Physics curriculum. Perfect for Punjab Boards (Lahore, Gujranwala, Multan, etc.) and all BISE boards across Pakistan.
📚 Related Resources – Chapter 5: Work and Energy
📋 Exercise Short Qs
📝 Short Qs
📖 Comprehensive Qs
🔢 Numerical Problems
✅ MCQs
✏️ Constructed Response
Work and Energy covers work, kinetic energy, potential energy, power, and efficiency.
📐 Multiple Choice Questions & Answers (PECTAA 2026)
5.1 Work done is maximum when the angle between the force \(F\) and the displacement \(d\) is:
✅ Correct Answer: (A) \(0^\circ\)
Work done is maximum when force and displacement are in the same direction (\(\cos 0^\circ = 1\)).
Work done is maximum when force and displacement are in the same direction (\(\cos 0^\circ = 1\)).
5.2 A joule can also be written as:
✅ Correct Answer: (D) \(\text{kg m}^2\text{s}^{-2}\)
\(1\text{ J} = 1\text{ N} \times 1\text{ m} = \text{kg m}^2\text{s}^{-2}\).
\(1\text{ J} = 1\text{ N} \times 1\text{ m} = \text{kg m}^2\text{s}^{-2}\).
5.3 The SI unit of power is:
✅ Correct Answer: (C) watt
The SI unit of power is watt (W).
The SI unit of power is watt (W).
5.4 The power of a water pump is \(2\,\text{kW}\). The amount of water it can raise in one minute to a height of \(5\,\text{m}\) is:
✅ Correct Answer: (D) 2400 litres
\(P = \frac{mgh}{t} \Rightarrow m = \frac{Pt}{gh} = \frac{2000 \times 60}{10 \times 5} = 2400\,\text{kg}\) (2400 litres).
\(P = \frac{mgh}{t} \Rightarrow m = \frac{Pt}{gh} = \frac{2000 \times 60}{10 \times 5} = 2400\,\text{kg}\) (2400 litres).
5.5 A bullet of mass \(0.05\,\text{kg}\) has a speed of \(300\,\text{ms}^{-1}\). Its kinetic energy will be:
✅ Correct Answer: (A) 2250 J
\(E_k = \frac{1}{2}mv^2 = \frac{1}{2}(0.05)(300)^2 = 2250\,\text{J}\).
\(E_k = \frac{1}{2}mv^2 = \frac{1}{2}(0.05)(300)^2 = 2250\,\text{J}\).
5.6 If a car doubles its speed, its kinetic energy will be:
✅ Correct Answer: (D) increased to four times
\(E_k \propto v^2\), so doubling speed increases kinetic energy by \(2^2 = 4\) times.
\(E_k \propto v^2\), so doubling speed increases kinetic energy by \(2^2 = 4\) times.
5.7 The energy possessed by a body by virtue of its position is:
✅ Correct Answer: (B) potential energy
Potential energy is the energy possessed by a body by virtue of its position.
Potential energy is the energy possessed by a body by virtue of its position.
5.8 The magnitude of momentum of an object is doubled, the kinetic energy of the object will:
✅ Correct Answer: (B) increase to four times
\(p = mv\), if \(p\) doubles \(\Rightarrow v\) doubles \(\Rightarrow E_k\) increases to four times.
\(p = mv\), if \(p\) doubles \(\Rightarrow v\) doubles \(\Rightarrow E_k\) increases to four times.
5.9 Which of the following is not a renewable energy source?
✅ Correct Answer: (B) Fossil fuels
Fossil fuels are non-renewable; hydroelectric, wind, and solar are renewable.
Fossil fuels are non-renewable; hydroelectric, wind, and solar are renewable.
📐 Key Concepts – Work and Energy (MCQs)
Work: \(W = F \times S\) or \(W = FS\cos\theta\)
Kinetic Energy: \(E_k = \frac{1}{2} mv^2\)
Potential Energy: \(E_p = mgh\)
Power: \(P = \frac{W}{t}\)
Efficiency: \(\eta = \frac{\text{Useful output}}{\text{Total input}} \times 100\)
Momentum: \(p = mv\)
💡 Exam Tip:
For MCQs, read each question carefully and eliminate obviously wrong options. Pay attention to key words like "maximum," "minimum," "not," and "always." Practice formulas thoroughly as many questions involve direct application of equations. These questions follow the PECTAA 2026 pattern and are prepared by Subject Specialist Muhammad Tayyab.
Chapter 1Physical Quantities and Measurements
Chapter 2Kinematics
Chapter 3Dynamics
Chapter 4Turning Effect of Forces
Chapter 5✨ Work and Energy
Chapter 6Mechanical Properties of Matter
Chapter 7Thermal Properties of Matter
Chapter 8Magnetism
Chapter 9Nature of Science
📖 Complete syllabus coverage for Class 9 Physics (PECTAA 2026) – Chapters 1 to 9
Created by Hira Science Academy | Aligned with PECTAA 2026 Syllabus