Which of the following statements is not a characteristic of a plane progressive wave?

• A. Energy travels out through the medium
• B. Neighboring points along the profile possess different amplitudes
• C. Neighboring points along the profile possess the same amplitude
• D. Neighboring particles vibrate with different phase

The correct expression for the potential at a point distance r from a charge q in an electric field is

• A) _q²⁄4πε_or²
• B) _q²/4πε_or
• C) _q/4πε_or²
• D) _q/4πε_or

The energy stored in a capacitor of capacitance 5?F is 40J. Calculate the voltage applied across its terminals? The energy stored in a capacitor of capacitance 5μF is 40J. Calculate the voltage applied across its terminals?

• A. 4000V
• B. 200V
• C. 16V
• D. 6V

A 90cm uniform lever has a load of 30N suspended at 15cm from one of its ends. If the fulcrum is at the center of gravity, the force that must be applied at its other end to keep it in horizontal equilibrium is

• A. 15N
• B. 20N
• C. 30N
• D. 60N

Birds can perch safely on overhead electric power cables without being electrocuted because

• A. birds can withstand high p.d. of the electric power cables
• B. any accumulated charge on the birds is quickly dissipated
• C. the feet of the birds are well insulated
• D. the current is a.c. and has particular direction

Specific heat capacity 36.4 Jkg-1 K^-1 of a body means that when 36.4J of heat energy is supplied to a body of

• A. mass 100kg the temperature rises by 1k
• B. mass 1kg, the temperature by 1000K
• C. mass 1kg, the temperature rises by 1K
• D. mass 100kg, the temperature rises by 1000k

The diagram below illustrates a velocity-time graph. Determine the distance between X and Y.

• A. 80.0m
• B. 160.0m
• C. 40.0m
• D. 10.0m

When an atom undergoes a beta decay, the atomic number of the nucleus

• A. Remains unchanged
• B. Decreases by one
• C. Increases by one
• D. Becomes zero

The uncertainty in determining the duration during which an electron remains in a particular energy level before returning to the ground state is 2.0 x 10\(^{-9}\)s. Calculate the uncertainty in determining its energy at that level. (\(\frac{h}{2 \pi}\) = h = 1.054 x 10\(^{-34}\)Js)

A car starts from rest and moves with a uniform acceleration of 30ms^-2 for 20s. Calculate the distance covered at the end of the motion

• A. 6km
• B. 12km
• C. 18km
• D. 24km