One special advantage of alcohol over mercury as a thermometric liquid is its?

• A. low density
• B. low freezing point
• C. high specific
• D. low boiling point

Melting ice cools an orange drink far better than the same mass of ice-cold water because

• A. melting ice is lower temperature than ice-cold water
• B. water has a higher specific heat than ice
• C. ice floats and cools the air above the drink
• D. ice absorbs latent heat during melting

The capacitance of a parallel plate capacitor is 20 μf in air and 60 μf in the presence of a dielectric. What is the dielectric constant?

• A) 0.3
• B) 6.0
• C) 3.0
• D) 2.0

Water does not drop through an open umbrella of silk materials unless the inside of the umbrella is touched. This is due to

• A. capilarity
• B. osmotic pressure
• C. viscosity
• D. surface tension

A force acts on a body for 0.5s changing its momentum from 16.0kg ms^-1 to 21.0kgms^-1, calculate the magnitude of the force

• A. 42.0N
• B. 37.0N
• C. 32.0N
• D. 10.0N

If the mechanical advantage of a machine is 4. What is its ratio for LOAD to EFFORT?

• A. 4:01
• B. 1:04
• C. 5:01
• D. 2:01

Heat is radiated by hot objects in the form

• A) x-rays
• B) light energy
• C) infrared rays
• D) solar energy

A cell of e.m.f 1.5V and internal resistance 2.552 is connected in series with an ammeter resistance 0.50 and a load of resistance 7.00. Calculate the current in the circuit

• A. 0.15A
• B. 0.20A
• C. 2.1OA
• D. 3.00A

An atom in an excited state is one whose

• A. electrons are in the conduction band.
• B. potential energy is minimum.
• C. potential energy is maximum.
• D. electrons have moved to a higher energy level.

A radio wave has a wavelength of 150m. If the velocity of radio waves is free spaces is 3 x 10\(^8\) ms\(^{-1}\), calculate the frequency of the radio wave

• A. 4.50 x 10¹⁰Hz
• B. 5.0 x 10⁹Hz
• C. 4.5 x 10⁹Hz
• D. 2.0 x 10⁶Hz