State any three properties of matter which are common to all substances.

If a load of 1 kg stretches a cord by 1.2cm, what is the force constant of the cord? {g=10ms^-2}

• A. 866Nm-1
• B. 833Nm-1
• C. 769Nm-1
• D. 667Nm-1

n a reverse biased junction diode, current flows in by

• A. positive holes alone
• B. majority carriers
• C. electron alone
• D. minority carriers

The wavelength of signals from a radio transmitter is 1500mm and the frequency is 200kHz. What is the wavelength for a transmitter operating at 100kHz?

• A. 7500m
• B. 300m
• C. 75m
• D. 15m

From the diagram below, the inductive reactance and the resistance R are respectively

• A) 50Ω and 45Ω
• B) 25Ω and 51Ω
• C) 20Ω and 50Ω
• D) 10Ω and 50Ω

In a large telecommunications auditorium, perforated absorbent materials are used to line the ceiling so as to

• A) Increase the reverberation of sound in the hall
• B) increase the amount of echo in the hall
• C) reduce the hight of the ceiling from the floor
• D) reduce the reverberation of sound in the hall

A man will exert the greatest pressure when he?

• A. lies flat on his back
• B. lies on his belly
• C. stands on both feet
• D. stands on the toes of one foot

A moving body accelerates when it?

• A. changes its direction at constant speed
• B. mauntains a constant linear speed
• C. covers equal distances in equal times in a straight line
• D. none of the above

If the force and the velocity on a system are each reduced simultaneously by half, the power of the system is

• A. doubled
• B. reduced to a quarter
• C. reduced by half
• D. constant

Electric motor primarily converts?

• A. electrical energy to chemical energy.
• B. kinetic energy to potential energy
• C. electrical energy to mechanical energy
• D. electrical energy to heat energy.