1. A. 9
2. A. 22°
3. C 5/18
9. C. Third
10. B. 8 cm
11. D. -1
12. A. 40
13. C. 34
14. D. 3/10
15. 40 cm (D)
16. 48° (B)
17. x = -\frac{2}{3} or x = -2 (D)
18. \{0, 2\} (D)
19. GH₵ 867.95 (B)
20. x = 4 (C)
21. 75^\circ (C)
22. 5 (B)
23. 0.00631 (C)
24. p is false and q is true (A)
25. \frac{1}{2} (A)
26. y = \frac{x}{2} (C)
27. 3 (D)
28. C. 10 cm
29. B. 132.0 cm²
30. B. 1,386 cm
31. A. 16
32. D. Scalene triangle
33. C. 3/20
34. A.
2. A. 22°
3. C 5/18
9. C. Third
10. B. 8 cm
11. D. -1
12. A. 40
13. C. 34
14. D. 3/10
15. 40 cm (D)
16. 48° (B)
17. x = -\frac{2}{3} or x = -2 (D)
18. \{0, 2\} (D)
19. GH₵ 867.95 (B)
20. x = 4 (C)
21. 75^\circ (C)
22. 5 (B)
23. 0.00631 (C)
24. p is false and q is true (A)
25. \frac{1}{2} (A)
26. y = \frac{x}{2} (C)
27. 3 (D)
28. C. 10 cm
29. B. 132.0 cm²
30. B. 1,386 cm
31. A. 16
32. D. Scalene triangle
33. C. 3/20
34. A.
*PHYSICS ALT B PRACTICAL ANSWERS.*
Q.1. (i) To place the meter rule on the knife edge, follow these steps:
1. Position the meter rule on the knife edge with its scale facing upward.
2. Adjust the position of the knife edge until the meter rule balances horizontally.
3. Record the point of balance G.
(ii) To attach the 20 g mass hanger securely at O, follow these steps:
1. Use one of the loops of string to attach the 20 g mass hanger securely at O.
2. Ensure that the position of the hanger remains constant throughout the experiment.
(iii) To attach the mass X securely at a distance AP = 2 cm on the rule, follow these steps:
1. Attach the mass X securely at a distance of 2 cm from the point of balance G on the rule.
2. Ensure that the position of X remains constant throughout the experiment.
(iv) To add a 20 g slotted mass to the hanger and record the total mass of the hanger and the added mass, follow these steps:
1. Add a 20 g slotted mass to the hanger.
2. Record the total mass of the hanger and the added mass as m = 40 g.
(v) To adjust the position of the knife edge until the rule balances horizontally at Q, follow these steps:
1. Adjust the position of the knife edge until the rule balances horizontally at Q.
2. Read and record the distance QG.
(vi) To read and record the distance QG, follow these steps:
1. Read the distance from the point of balance G to the point Q on the rule.
2. Record the distance QG.
(vii) To evaluate de^{-1}, follow these steps:
1. Substitute the value of de^{-1} into the equation.
2. Evaluate the expression to find the value of de^{-1}.
(viii) To repeat the experiment for four other total masses m = 60 g, 80 g, 100 g, and 120 g, follow these steps:
1. Repeat the experiment for each of the given total masses.
2. Read and record the distance QG for each total mass.
3. Evaluate d^{-1} for each total mass.
(ix) To tabulate the results, follow these steps:
1. Create a table with columns for the total mass, distance QG, and d^{-1}.
2. Fill in the values for each total mass.
(x) To plot a graph with m on the vertical axis and d^{-1} on the horizontal axis, follow these steps:
1. Plot the points for each total mass on the graph.
2. Connect the points with a smooth curve.
(xi) To determine the slope of the graph and the intercept on the vertical axis, follow these steps:
1. Calculate the slope of the graph by finding the change in y divided by the change in x.
2. Determine the intercept on the vertical axis by finding the y-intercept of the graph.
(xii) If in the experiment m = 70 g, use the graph to determine the balance length d, follow these steps:
1. Use the graph to find the corresponding value of d^{-1} for m = 70 g.
2. Invert the value of d^{-1} to find the value of d.
(xiii) To calculate Z using the equation z = (100 + 3)/(50), follow these steps:
1. Substitute the values into the equation.
2. Calculate the value of Z.
(xiv) Two precautions taken to ensure accurate results are:
1. Ensuring that the position of the hanger remains constant throughout the experiment.
2. Adjusting the position of the knife edge until the rule balances horizontally at Q.
(b) (i) The conditions necessary for a body to be in equilibrium under parallel forces are:
1. The resultant force acting on the body must be zero.
2. The moments of the forces about any point must be equal and opposite.
(ii) The moment of a force is defined as the product of the force and the distance from the point of rotation.
Q.1. (i) To place the meter rule on the knife edge, follow these steps:
1. Position the meter rule on the knife edge with its scale facing upward.
2. Adjust the position of the knife edge until the meter rule balances horizontally.
3. Record the point of balance G.
(ii) To attach the 20 g mass hanger securely at O, follow these steps:
1. Use one of the loops of string to attach the 20 g mass hanger securely at O.
2. Ensure that the position of the hanger remains constant throughout the experiment.
(iii) To attach the mass X securely at a distance AP = 2 cm on the rule, follow these steps:
1. Attach the mass X securely at a distance of 2 cm from the point of balance G on the rule.
2. Ensure that the position of X remains constant throughout the experiment.
(iv) To add a 20 g slotted mass to the hanger and record the total mass of the hanger and the added mass, follow these steps:
1. Add a 20 g slotted mass to the hanger.
2. Record the total mass of the hanger and the added mass as m = 40 g.
(v) To adjust the position of the knife edge until the rule balances horizontally at Q, follow these steps:
1. Adjust the position of the knife edge until the rule balances horizontally at Q.
2. Read and record the distance QG.
(vi) To read and record the distance QG, follow these steps:
1. Read the distance from the point of balance G to the point Q on the rule.
2. Record the distance QG.
(vii) To evaluate de^{-1}, follow these steps:
1. Substitute the value of de^{-1} into the equation.
2. Evaluate the expression to find the value of de^{-1}.
(viii) To repeat the experiment for four other total masses m = 60 g, 80 g, 100 g, and 120 g, follow these steps:
1. Repeat the experiment for each of the given total masses.
2. Read and record the distance QG for each total mass.
3. Evaluate d^{-1} for each total mass.
(ix) To tabulate the results, follow these steps:
1. Create a table with columns for the total mass, distance QG, and d^{-1}.
2. Fill in the values for each total mass.
(x) To plot a graph with m on the vertical axis and d^{-1} on the horizontal axis, follow these steps:
1. Plot the points for each total mass on the graph.
2. Connect the points with a smooth curve.
(xi) To determine the slope of the graph and the intercept on the vertical axis, follow these steps:
1. Calculate the slope of the graph by finding the change in y divided by the change in x.
2. Determine the intercept on the vertical axis by finding the y-intercept of the graph.
(xii) If in the experiment m = 70 g, use the graph to determine the balance length d, follow these steps:
1. Use the graph to find the corresponding value of d^{-1} for m = 70 g.
2. Invert the value of d^{-1} to find the value of d.
(xiii) To calculate Z using the equation z = (100 + 3)/(50), follow these steps:
1. Substitute the values into the equation.
2. Calculate the value of Z.
(xiv) Two precautions taken to ensure accurate results are:
1. Ensuring that the position of the hanger remains constant throughout the experiment.
2. Adjusting the position of the knife edge until the rule balances horizontally at Q.
(b) (i) The conditions necessary for a body to be in equilibrium under parallel forces are:
1. The resultant force acting on the body must be zero.
2. The moments of the forces about any point must be equal and opposite.
(ii) The moment of a force is defined as the product of the force and the distance from the point of rotation.