Question Library

A photon of wavelength 6.0 x 10\(^{-7}\) m behaves like a particle of a certain mass. The value of that mass is [h = 6.63 x 10\(^{-34}\) Js, c = 3.0 x 10\(^8\) ms\(^{-1}\)]

The instantaneous value of the induced e.m.f as a function of time is ε = εo sin ωt where εo is the peak value of the e.m.f. The instantaneous value of the e.m.f., one quarter of the period is

Which of the following physical quantities is correctly paired with it's corresponding S.I unit?

A swinging pendulum between the rest position and its maximum displacement possesses

Which of the following observations is not an effect of surface tension?

According to the kinetic theory of gasses, which of the following property of a gas can be affected by the collision of the gas molecule with the walls of the container?

A dry plastic comb used in combing hair was found to attract pieces of paper and dust. The most probable explanation for this phenomenon is that the comb has been given

In a nuclear reactor, chain reactions result from the release of

A bulb marked 240V, 40W is used for 30 minutes. Calculate the heat generated

You have been provided with an accumulator E, a standard resistor Rx, two resistance boxes R\(B_1\) and R\(B_2\), two keys \(K_1\) and \(K_2\) and other necessary apparatus. Measure and record the e.m.f of the accumulator. Connect a circuit as shown above. Set the resistance R, in the resistance box such that R in R\(B_1\) = R in R\(B_2\) = 1\(\Omega\). With \(K_1\) open and \(K_2\) closed, measure and record the potential difference V across the standard resistor Rx. (v) Close K, and K,. Read and record the potential difference \(V_o\) across Rx. Evaluate V\(_{1}^{-1}\) Repeat procedure (v) for four other values of R = 2, 3, 4 and 5\(\Omega\) respectively. In each case, ensure that the value of R in R\(B_1\) is equal to the value of R in R\(B_2\). Evaluate V\(_{1}^{-1}\) in each case. Tabulate your readings. Plot a graph of V\(_{1}^{-1}\) on the vertical axis against R on the horizontal axis starting both axes from the origin (0,0). Determine the slope, s, of the graph and the intercept on the vertical axis. Evaluate y = \(\frac{1}{s}\) State two precautions taken to ensure accurate results (b)i. Explain what is meant by the potential difference between two points in an electric circuit ii. A cell has an e.m.f. of 3 V. When it is connected across a resistor of resistance 4\(\Omega\), a current 0.5A passes through the circuit. Calculate the internal resistance of the cell.

A stone projected horizontally from the top of a tower with a speed of 4 ms\(^{-1}\) lands on the level ground at a horizontal distance 25 m from the foot of the tower. Calculate the height of the tower. g = 10 ms\(^{-2}\)]

At low humidity in an environment, the human skin is usually?

Use the diagram above to answer the question below. Which of the following diagrams represents the magnetic field of two isolated unlike poles

If the capacitance of a capacitor is C = \(\frac{(εA)}{d}\) which of the following parameters is varied when a variable capacitors is used for tuning radio sets?

A drop of petrol makes a finger colder than a drop of water would because?