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Class 7 Science: Electricity questions and answers
Which one of the following is a source of electricity?
A. Electromagnet.
B. Bulb.
C. Dynamo.
D. Dam.
(1m 18s)
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1.
In which one of the following circuits will the bulb light most brightly?
2.
Pupils at Umeme primary school were asked how they would investigate on the traditional belief that ‘lighting strikes red’. Four pupils J, K, L and M suggested the following experiments to be carried out and observations be made after thunderstorms. J. Hanging a red shirt on a tree. K. Placing red, green, blue and white shirts in a long line on the ground. L. Placing a red shirt on the ground.
3.
Jiva connected batteries to a bulb with wires as shown in the diagram below. In which set up was the bulb brightest?
4.
The purpose of a fuse in a circuit is to A. Break the circuit when necessary B. Reduce the current C. Switch the current on and off D. Complete the circuit.
5.
In which one of the following circuits would the bulb light brightest?
6.
Non-conductors of electricity can be used in making A. Insulators B. Handles of cooking utensils C. Fuses D. Contacts in switches.
7.
The diagram below represents a circuit. Which one of the following statements is TRUE about the circuit? The A. Bulb uses power from three cells B. Bulb uses power from one cell C. Cells are connected in series D. Cells are connected in parallel.
8.
Tall buildings are fitted with sharp-pointed metal rods at their tops and connected to the ground. The rods are for A. Protecting the buildings against lighting B. Protecting electricity users from being electrocuted C. Fixing aerials for radios and televisions D. Allowing expansion of walls during hot weather.
9.
Which of the following is a recommended practice to avoid being struck by lightning? A. Sheltering under a tree. B. Using an umbrella when in an open field. C. Sheltering while leaning on a wall. D. Wearing rubber shoes with thick soles.
10.
Which one of the following DOES NOT produce electricity? A. Bicycle dynamos. B. Batteries. C. Water dams. D. Solar panels.
11.
In which one of the following circuit diagrams will the bulb not light?
12.
The diagram below represents a set up that can be used to investigate good and poor conductors of electricity. Which one of the following materials when used to connect wires at position K would make the bulb light? A. Piece of thread. B. Razor blade. C. Piece of glass. D. Cello tape
13.
The diagram below represents a safety sign when dealing with electricity. The sign means A. Do not insert objects into electric socket B. Do not use appliances with damaged plugs or wires C. Do not plug in many electrical appliances D. Do not get near.
14.
To save a person who has touched an exposed electric wire, one should A. Push the person away using dry wood B. Pull the person from the wire C. Pour cold water on the person. D. Shake the person vigorously
15.
Which one of the following pairs of materials are good conductors of electricity? A. Steel wool and glass. B. Coin and chalk. C. Pins and dry wood. D. Aluminium foil and razor blade.
16.
Which one of the following is a source of electricity? A. Electromagnet. B. Bulb. C. Dynamo. D. Dam.
17.
Which of the following practices will NOT result in a person getting an electric shock? A. Touching sockets with wet hands. B. Putting pencils in sockets. C. Overloading the sockets. D. Putting iron nails in sockets.
18.
Which one of the following pairs is a source of electricity? A. Dam and a dynamo. B. Wind-driven turbine and a dam C. Torch and a dynamo. D. Dry cell and a geothermal generator.
19.
Which one of the following is a source of electricity? A. Torch. B. Dam. C. Solar panel. D. Biogas plant.
20.
Which one of the following is a safety measure against lightning when it is raining? A. Leaning against walls. B. Walking on open areas. C. Wearing rubber shoes. D. Using an umbrella.
21.
The diagram below represents a set up that can be used to investigate good and poor conductors of electricity? Which one of the following materials when used to connect wires at point S would make the bulb not light? A. Pencil. B. Aluminium foil. C. Steel wool. D. Rubber band
22.
During a thunderstorm, pupils were observed (i) Sheltering under the verandah. (ii) Wearing red jackets in a classroom (iii) Playing on the football pitch (iv) Lying on the ground in the classroom In which pair of observations are the pupils more likely to be struck by lightning? A.(i) and (iii) B. (i) and (iv) C. (ii) and (iii) D.(ii) and (iv)
23.
The following can produce electricity except A. Solar drier B. Biogas C. Torch battery D. Dynamo
24.
Which one of the following pairs consists only of sources of electricity? A. Wind-driven turbine and electric water heater. B. Electric water heater and generator. C. Generator and electric iron box. D. Bicycle dynamo and wind-driven turbine
25.
In which one of the circuits below would the bulb light?
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