One of the conditions necessary for an object to be in equilibrium when acted upon by a number of parallel forces is that the vector sum of the forces is

• A. Average
• B. Zero
• C. Negative
• D. Positive

A moving-coil galvanometer which gives a full-scale on deflection with 0.005A is converted to a voltmeter reading up to 5V using an external resistance of 975Ω. What is the resistance of the metre?

• A. 0.25Ω
• B. 2.50Ω
• C. 25.00Ω
• D. 250.00Ω

Images formed by a convex mirror are always

• A. magnified
• B. behind the mirror
• C. real
• D. inverted

The magnitude of the gravitational force between two particles 0.10m apart is 10N. If the distance between them is increased to 0.20m, calculate the magnitude of the new force

• A. 40.0N
• B. 20.0N
• C. 5.0N
• D. 2.5N

Which of the following correctly, describes the image of an object, 4cm from a diverging lens of focal length 12cm?

• A. The image is virtual, 3cm in front of the lens
• B. The image is real, 6cm behind the lens
• C. The image is virtual, 6cm in front of the lens
• D. The image is real, 3cm in front the lens

One of the features of the fission process is that

• A. it leads to chain reaction
• B. its products are not radioactive
• C. neutrons are not released
• D. the of the masses of the reactants equals the sum of the masses of the products

A magnified and virtual image of a near object is produced by

• A. prism binoculas
• B. astronomical telescope
• C. periscope
• D. simple microscope

The continuous stirring in the method of mixtures to determine the specific thermal capacity of a substance ensures

• A. continuous dissipation of heat to the room
• B. uniform distribution of thermal energy to all parts of the mixture
• C. that the thermal energy is confined to the mixture
• D. that there is rapid heat exchange

Which of the following diagrams correctly illustrates the mode of oscillation of air in a tube for the first overtone?

• A. A
• B. B
• C. C
• D. D

Lenz's law of electromagnetic induction states that

• A. e.m.f. is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit.
• B. the induced current in a conductor is in such a direction as to oppose the change producing it
• C. the magnitude of the induced e.m.f. in a circuit is proportional to the rate of change of the number of lines of force linking the circuit
• D. a force is exerted on a current-carrying conductor in a magnetic Held