In the absence of gravitational force, the weight of the body is

• A. its mass
• B. zero
• C. its density
• D. its volume

The cost of running five 60 W lamps and four 100 W lamps for 20 hours if electrical energy cost ₦10.00 per kwh is

• A. ₦280.00
• B. ₦160.00
• C. ₦120.00
• D. ₦140.00

An electric device is rated 2000W, 250V. Calculate the maximum current it can take

• A. 9A
• B. 8A
• C. 7A
• D. 6A

The average distance moved by a molecule between collisions is called

• A. molecular distance
• B. intermolecular distance
• C. mean distance
• D. mean free path

In the wave equation y = E_o, sin(299t - \(\pi\)), E_o represents the

• A. amplitude
• B. frequency
• C. period
• D. wavelength

The colours seen on soap bubbles are due to

• A. Diffraction
• B. Refraction
• C. Dispersion
• D. Interference

An electron of mass 9. 1 x 10\(^{-31}\) kg moves with a velocity of 4.2 x 10 ms\(^{-1}\) between the cathode and anode of an x-ray tube. Calculate the wavelength. (Take Planck's constant h = 6.6 x 10\(^{-34}\) J S)

Two bodies P and Q, are in thermal equilibrium, which of the following statements about the bodies is correct?

• A. the temperature of Q is higher than that of P
• B. P and Q have the same heat capacity
• C. P and Q have the same mass
• D. P and Q are at the same temperature

Which of the following instruments can be used to compare the relative magnitude of similar charges on two given bodies?

• A. Electrophorus
• B. Ebonite rod
• C. Proof plane
• D. Gold-leaf electroscope

An object is embedded in a block of ice, 10 cm below the plane surface. if the refractive index of the ice is 1.50, the apparent depth below the surface is

• A) 2.50 cm
• B) 6.67 cm
• C) 7.50 cm
• D) 7.63 cm