An electric current of 2 amperes flows in a heating coil of resistance 50 ohms for 3 minutes 20 seconds. Determine the heat produced

• A. 0.5kJ
• B. 8.0kJ
• C. 20.0kJ
• D. 40.0kJ

A transformer has 400 turns of wire in the primary coil and 40 turns in the secondary col. If the input voltage is 150 volts. Calculate the magnitude of the output voltage

• A. 150V
• B. 55V
• C. 36V
• D. 15V

Heat is supplied uniformly at the rate of 100W to 1.0 x 10^-2kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5^oC, then the specific heat capacity of the liquid is

• A. 2.0 x 10\(^2\)Jkg\(^-1\)K\(^-1\)
• B. 2.0 x 10\(^2\)Jkg\(^-1\)
• C. 4.0 x 10\(^4\)Jkg\(^-1\)K\(^-1\)
• D. 4.0 x 10\(^4\)Jkg\(^-1\)

In a uniform electric field, the magnitude of the force on a charge of 0.2 C is 4N. Calculate the electric field intensity

• A. 20 N C^-1
• B. 8 N C^-1
• C. 5 N C^-1
• D. 2 N C^-1

A thin converging lens has a power of 4.0 diopters determined its focal length.

• A. 2.50m
• B. 0.03m
• C. 5.00m
• D. 0.25m

To convert an alternating current dynamo into a direct current dynamo, the

• A. number of turns in the coil is increased
• B. strength of the field magnet is increased
• C. slip rings are replaced with a split ring commutator
• D. coil is wound on a soft iron armature

A force of 40 N is applied at the free end of a wire fixed at one end to produce an extension of 0.24 mm. If the original length and diameter of the wire art., 3 m and 2.0 mm respectively, calculate the: (a) stress on the wire; (b) strain in the wire.

Three 3ω resistance are connected in parallel what is the equivalent resistance?

• A. 1ω
• B. 9ω
• C. 3ω
• D. 0.33ω

Which of the following statements best describes a rigid body? A body which

• A. is not equally deformed
• B. when deformed regains it shape
• C. is brittle
• D. when deformed remains deformed

A hydrometer is an instrument used in measuring?

• A. vapour pressure of a fluid
• B. density of liquid
• C. relative humidity of a liquid
• D. relative density of a liquid