QuestionJune 22, 2025

Part 1-True/False (20% ) Write "True" if the Statement is correct or "False" if it is incorrect on the separate answer sheet 1. A machine can change one form of energy in to another form of energy 2. A lever multiply force and energy at the same time. 3. When the load is greater than the effort, it is said to be force multiplier. 4. Actual mechanical advantage is formed if there is no waste of energy because of friction. 5. If the mechanical advantage is greater than one the machine is a force mu 6. Spring is a type of simple machine. 7. Fishing pole is an example of third class lever. 8. Inclined plane is used to multiply speed. 9. A machine produces an output force of (1)/(2) times the input force The machine is said to be force multiplier. 10. The velocity ratio of single fixed pulley is 2. Part II:- Multiple choices (56% ) Choose the correct answer from the given alternatives and write the letter of your choice on the separate answer sheet. 11. A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the processes of A. radiation C. convection B. absorption D. conduction 12. What is the quantity of heat energy required to heat a 10kg block of copper from 300 K 340 K? ( use specific heat capacity of copper=420J/kgK A. 168 KJ C. 168 J B. 125 KJ D. 125J 13. Calculate the increase in length of a 40 cm brass rod that is heated from 30^circ C to 50^circ C (linear expansion of Brass is 1.9times 10^-5K^-1 A. 0.51 cm B.1.9 cm C. 0.015 cm D. 15.20 cm

Part 1-True/False (20% ) Write "True" if the Statement is correct or "False" if it is incorrect on the separate answer sheet 1. A machine can change one form of energy in to another form of energy 2. A lever multiply force and energy at the same time. 3. When the load is greater than the effort, it is said to be force multiplier. 4. Actual mechanical advantage is formed if there is no waste of energy because of friction. 5. If the mechanical advantage is greater than one the machine is a force mu 6. Spring is a type of simple machine. 7. Fishing pole is an example of third class lever. 8. Inclined plane is used to multiply speed. 9. A machine produces an output force of (1)/(2) times the input force The machine is said to be force multiplier. 10. The velocity ratio of single fixed pulley is 2. Part II:- Multiple choices (56% ) Choose the correct answer from the given alternatives and write the letter of your choice on the separate answer sheet. 11. A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the processes of A. radiation C. convection B. absorption D. conduction 12. What is the quantity of heat energy required to heat a 10kg block of copper from 300 K 340 K? ( use specific heat capacity of copper=420J/kgK A. 168 KJ C. 168 J B. 125 KJ D. 125J 13. Calculate the increase in length of a 40 cm brass rod that is heated from 30^circ C to 50^circ C (linear expansion of Brass is 1.9times 10^-5K^-1 A. 0.51 cm B.1.9 cm C. 0.015 cm D. 15.20 cm
Part 1-True/False (20% ) Write "True" if the Statement is correct or "False" if it is incorrect on the separate answer sheet 1. A machine can change one form of energy in to another form of energy 2. A lever multiply force and energy at the same time. 3. When the load is greater than the effort, it is said to be force multiplier. 4. Actual mechanical advantage is formed if there is no waste of energy because of friction. 5. If the mechanical advantage is greater than one the machine is a force mu 6. Spring is a type of simple machine. 7. Fishing pole is an example of third class lever. 8. Inclined plane is used to multiply speed. 9. A machine produces an output force of (1)/(2) times the input force The machine is said to be force multiplier. 10. The velocity ratio of single fixed pulley is 2. Part II:- Multiple choices (56% ) Choose the correct answer from the given alternatives and write the letter of your choice on the separate answer sheet. 11. A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the processes of A. radiation C. convection B. absorption D. conduction 12. What is the quantity of heat energy required to heat a 10kg block of copper from 300 K 340 K? ( use specific heat capacity of copper=420J/kgK A. 168 KJ C. 168 J B. 125 KJ D. 125J 13. Calculate the increase in length of a 40 cm brass rod that is heated from 30^circ C to 50^circ C (linear expansion of Brass is 1.9times 10^-5K^-1 A. 0.51 cm B.1.9 cm C. 0.015 cm D. 15.20 cm

Solution
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Answer

True, False, True, False, True, False, True, False, False, False ### D, A, C Explanation 1. Evaluate True/False Statements 1. True - Machines can convert energy forms. 2. False - A lever multiplies force, not energy. 3. True - Greater load than effort indicates a force multiplier. 4. False - Actual mechanical advantage accounts for friction losses. 5. True - Mechanical advantage > 1 means force multiplier. 6. False - A spring is not a simple machine. 7. True - Fishing pole is a third-class lever. 8. False - Inclined planes multiply force, not speed. 9. False - Output force less than input means not a force multiplier. 10. False - Velocity ratio of a single fixed pulley is 1. 2. Solve Multiple Choice Questions Question 11: Heat Transfer Method # D. Conduction - Heat transfers through the spoon by conduction. Question 12: Calculate Heat Energy # Use formula Q = mc\Delta T: # Q = 10 \times 420 \times (340 - 300) = 168000 \text{ J} = 168 \text{ kJ}. # A. 168 KJ Question 13: Calculate Linear Expansion # Use formula \Delta L = L_0 \alpha \Delta T: # \Delta L = 40 \times 1.9 \times 10^{-5} \times (50 - 30) = 0.0152 \text{ cm}. # C. 0.015 cm

Explanation

1. Evaluate True/False Statements<br /> 1. True - Machines can convert energy forms.<br /> 2. False - A lever multiplies force, not energy.<br /> 3. True - Greater load than effort indicates a force multiplier.<br /> 4. False - Actual mechanical advantage accounts for friction losses.<br /> 5. True - Mechanical advantage > 1 means force multiplier.<br /> 6. False - A spring is not a simple machine.<br /> 7. True - Fishing pole is a third-class lever.<br /> 8. False - Inclined planes multiply force, not speed.<br /> 9. False - Output force less than input means not a force multiplier.<br /> 10. False - Velocity ratio of a single fixed pulley is 1.<br /><br />2. Solve Multiple Choice Questions<br /><br /> Question 11: Heat Transfer Method<br /> # D. Conduction - Heat transfers through the spoon by conduction.<br /><br /> Question 12: Calculate Heat Energy<br /> # Use formula $Q = mc\Delta T$:<br /> # $Q = 10 \times 420 \times (340 - 300) = 168000 \text{ J} = 168 \text{ kJ}$.<br /> # A. 168 KJ<br /><br /> Question 13: Calculate Linear Expansion<br /> # Use formula $\Delta L = L_0 \alpha \Delta T$:<br /> # $\Delta L = 40 \times 1.9 \times 10^{-5} \times (50 - 30) = 0.0152 \text{ cm}$.<br /> # C. 0.015 cm
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