Question Library

You are provided with a stopwatch, a meter rule, a split cork, retort stand and clamp, a pendulum bob, a piece of thread, and other necessary apparatus. i. Place the retort stand on a laboratory stool. Clamp the split cork. ii. Suspend the pendulum bob from the split cork such that the point of support P of the bob is at height H = 100cm above the floor Q. The bob should not touch the floor and H should be kept constant throughout the experiment. iii. Adjust the length of the thread such that the center A of the bob is at a height y= AQ= 20cm from the floor. iv. Displace the bob such that it oscillates in a horizontal plane. v. Take the time t for 20 complete oscillations. vi. Determine the period T of oscillation and evaluate T vii. Repeat the procedure for four other values of y = 30cm, 40cm, 50cm, and 60cm. In each case, determine T and T. viii. Tabulate the results. ix. Plot a graph of T on the vertical axis and y on the horizontal axis, starting both axes from the origin (0,0). x. Determine the slope, s, of the graph and the intercept c on the vertical axis. xi. If in this experiment SR= c, calculate R. x. State two precautions taken to ensure accurate results. (b) i. The bob of a simple pendulum is displaced a small distance from the equilibrium position and then released to perform simple harmonic motion Identify where its: (\(\propto\)) kinetic energy is maximum (\(\beta\)) acceleration is maximum ii. An object of weight 120N vibrates with a period of 4.0s when hung from a spring. Calculate the force per unit length of the spring. [g= 10ms\(^{-2}\), \(\pi\)=3.142]

You are provided with a converging lens and holder, a screen, a ray box containing an illuminated object pin, and a meter rule.(See illustration above) i. Place the lens in its holder such that it is facing a distant object seen through a well-lit laboratory window. Move the screen to and fro until a sharp image of the distant object is formed on it. Measure the distance, \(f_0\), between the screen and the lens. ii. Clamp the meter rule securely to the table. Place the illuminated object pin at the end R of the meter rule. iii. Place the lens at a position P such that X = RP = 20cm. iv. Move the screen to a position Q to receive a sharp image of the object. Measure the distance Y = PQ. v. Evaluate Z = (X+Y) vi. Repeat the procedure for five other values of x = 25cm. 3Ocm, 35cm, 40cm and 45cm. In each case, record X,Y and evaluate Z. vii. Tabulate the results. viii. Plot a graph with Z on the vertical axis and X on the horizontal axis. Draw a smooth curve through the points. ix. Determine from your graph the minimum value of Z=\(Z_0\) and its corresponding distance x. Evaluate W = ½ (\(\frac{Z_0}{4} + \frac{X_0}{2}\)) xi. State two precautions taken to ensure accurate results. (b) i. Draw a ray diagram to show how a Convex lens forms an image of magnification less than one. ii. Name two pairs of features in the human eye and a lens camera that performs similar functions.

You are provided with a battery of e.m.f. E, a key K, a voltmeter, a standard resistor \(R_0\) = 2\(\Omega\), a resistance box R, and some connecting wires. i. Measure and record the e.m.f. E of the battery. i. Set up a circuit as shown in the diagram above with the key open. iii. Set the resistance on the resistance box to R 22. iv. Close the key, read and record the potential difference V on the voltmeter. v. Evaluate V\(^{-1}\) vi. Repeat the procedures for five other values of R = 5\(\Omega\) 10\(\Omega\),12\(\Omega\),15\(\Omega\) and 20\(\Omega\). In each case, record V and evaluate V\(^{-1}\) vii. Tabulate the results. viii. Plot a graph with R on the vertical axis and V\(^{-1}\) l on the horizontal axis, starting both axes from the origin (0,0). ix. Determine the slope, s, of the graph and the intercept c on the vertical axis. x. Calculate \(\propto\) and \(\beta\) from the equations s = \(R_0\) \(\propto\) and c= - (\(R_0\)+B). xi. State two precautions taken to obtain accurate results.

Which of the following is consistent with Charles' law?

You are provided with a battery of e.m.f. E, a key K, a voltmeter, a standard resistor \(R_0\) = 2\(\Omega\), a resistance box R, and some connecting wires. i. Measure and record the e.m.f. E of the battery. i. Set up a circuit as shown in the diagram above with the key open. iii. Set the resistance on the resistance box to R 22. iv. Close the key, read and record the potential difference V on the voltmeter. v. Evaluate V\(^{-1}\) vi. Repeat the procedures for five other values of R = 5\(\Omega\) 10\(\Omega\),12\(\Omega\),15\(\Omega\) and 20\(\Omega\). In each case, record V and evaluate V\(^{-1}\) vii. Tabulate the results. viii. Plot a graph with R on the vertical axis and V\(^{-1}\) l on the horizontal axis, starting both axes from the origin (0,0). ix. Determine the slope, s, of the graph and the intercept c on the vertical axis. x. Calculate \(\propto\) and \(\beta\) from the equations s = \(R_0\) \(\propto\) and c= - (\(R_0\)+B). xi. State two precautions taken to obtain accurate results.

The efficiency of energy conversion on the energy flow through a hydroelectric power is?

A body of mass m moving around a circle of radius r with a uniform speed v experiences a centripetal force F. The work done by the centripetal force on it is

The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is?

A missile is projected so as to attain its maximum range. Calculate the maximum height attained if the initial velocity of projection is 200 ms\(^{-1}\). [g = 10ms\(^{-2}\)]

(a) Define strain. (b) A rubber band is stretched to twice its original length. Calculate the strain on the rubber band.

A man walks 1km due east and then 1 km due north His displacement?

Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?

The electrochemical equivalent of silver is 0.0012g/C. If 36.0g of silver is to be deposited by electrolysis on a surface by passing a steady current for 5mins, the current must be?

The resistance of a 40W car head lamp, drawing current from a 12V battery is ____.

You are provided with an ammeter, a resistor, key, metre bridge, and other necessary apparatus. i. Connect a circuit as shown in the diagram above. ii. Close the key and use the jockey to make contact with AB at N such that AN = d = 25cm iii. Read and record the ammeter reading. iv. Evaluate 1\(^{-1}\). v. Repeat the procedures for values of d = 35cmm, 50cm, 65cm and 80cm. In each case, record I and determine 1\(^{-1}\) vi. Tabulate your results. vii. Plot a graph with log on the vertical axis and d on the horizontal axis. viii. Determine the slope, s of the graph. ix. State two precautions taken to obtain accurate results. (b)i. Use your graph to determine the value of d = l = 1.5A. ii. State two factors that affect the resistance of a wire.