If the total force acting on a particle is zero, the linear momentum will

• A. Increase
• B. Decrease
• C. Be Constant
• D. Increase then decrease

The amplitude of a particle executing simple harmonic motion in 5cm while its angular frequency is 10 rad s^-1. calculate the magnitude of the maximum acceleration of the particle

• A. 0.25ms^-2
• B. 0.50ms^-2
• C. 2.00ms^-2
• D. 5.00ms^-2

ai. Define the electric potential at a point in an electric field.

ii. An uncharged body, A, was charged electrostatically by a test charge, B, using the method of induction and the method of contact. State two differences between the two methods.

b. An important precaution during an electricity experiment is to open the circuit when no readings are being taken. Givetwo reasons for the stated precaution.

ci. Fig. 11.0 is a circuit diagram in which a coil of inductance, L, and a resistor of resistance, R, are connected to a variable alternating source of frequency, f.

The table shows the square of the impedance, \(Z^2\); corresponding to each value of \(ƒ^2\).

Write down the equation for Z in terms of \(f^2\), \(R^2\), and \(L^2\).

ii. Plot a graph \(Z^2\) against \(f^2\) of and use it to determine the values of:

i. L

ii. R

[\(π^2\) = 10]

The period of a simple pendulum of length 80.0cm was found to have doubled when the length of the pendulum was increased by X. Calculate X.

• A. 26.7cm
• B. 40.0cm
• C. 160.0cm
• D. 240.0cm

The intensity of light falling on the film in a camera depend on the i. brightness of the object. ii. diameter of the aperture stop. iii. speed of the shutter. Which of the statements is/are correct/

• A. i, ii and iii
• B. i and ii only
• C. i and ii only
• D. iii only

The ground is always cold at night because the

• A) atmosphere absorbs the sun's energy at night
• B) earth radiates heat to the atmosphere at night
• C) sun no longer shine at night
• D) atmosphere reflects the sun's energy at night

The kinetic theory of photoelectron liberated from a metallic surface depends on the

• A. intensity of the incident radiation
• B. time duration of the incident radiation
• C. temperature of the incident radiation
• D. frequency of the incident radiation

A spring balance,which is suspended from the roof of a lift, carries a mass of 1kg at its free end. If the lift accelerates upwards at 2.5ms^-2, determine the reading on the spring balance. [g = 10ms^-2]

• A. 24.0N
• B. 12.5N
• C. 7.5N
• D. 4.0N

A paralIel beam of unpolarized light is incident on a plane glass of refractive index 1.60 at an angle to the normal. If the reflected beam is completely polarized, calculate the angle of incidence of the beam.

Natural radioactivity is the random spontaneous disintegration of the nuclei of heavy isotopes of certain elements with the emission of

• A. \(\alpha\), X-rays, and \( \beta\)
• B. \(\alpha\), \(\beta\) and \(\gamma\)-rays
• C. X, \(\alpha\), \(\gamma\)-ray
• D. \(\alpha\), \( \beta\) and X-rays