The reverse side of a three-pin plug with incorrect connection of wires is shown below.
(a) Identify the fault in the above connection.
(b) Mention a risk factor involved if the user operates the appliance without correcting it.
(c) Will the appliance function in the present situation? (Yes or No)
(a) The live red wire is connected to the earth terminal, and the green earth wire is connected to the live terminal. The live and earth wires should be interchanged.
(b) The appliance’s outer metallic body may become live, creating a risk of electric shock.
(c) No, the appliance will not function because the wiring connections are incorrect.
More ICSE Moderate level questions
An electric iron rated 1100 W, 220 V is operated for 5 hours. Calculate: (a) the minimum rating of the fuse required. (b) the energy consumed in kWh. (c) the cost of the energy consumed, if the rate is ₹10 per unit.
The diagram shows wiring in a meter room of a building. (a) What is the current rating of device X? (b) What is the difference between switch Z shown in the diagram and the switches used to operate different appliances at home? (c) What is the unit of the physical quantity displayed in Y?
A fuse is rated 5 A. Can it be used with a geyser rated 1540 W, 220 V. Write Yes or No. Give supporting calculations to justify your answer.
According to the NEW colour convention which colour of wire is connected to: (a) the metal body of the appliance (b) the switch of the appliance?
(a) Which electrical component protects the electric circuit in case of excess current and which can also be used as a switch? (b) Name the wire to which this electrical component is connected in an electric circuit.
Identify the option that displays the correct wiring with correct colour code: (a) (b) (c) (d)
Bulb A rated 160 W, 40 V and Bulb B rated 40 W, 40 V are connected as shown in the diagram. (a) Calculate the ratio V1 : V2. (b) If bulb A fuses, the current in the circuit remains the same. State True or False.
The diagram shows a wheel with a handle. Two forces, F1 and F2 of equal magnitudes are acting on the handle as shown in the diagram. (a) Which force produces negative moment? (b) Is the wheel in equilibrium? (Yes or No) (c) Justify your answer stated in (b).
(a) Name the unit of work done used on the subatomic scale. (b) To which class of lever does a pair of scissors belong? (c) A stone is tied to a string and displaced from A to B by application of constant force F in three different ways as shown below. Arrange the three cases in ascending order of the work done by the force. (Given AJB is a semicircle, θ < 90° and AB = 20 m)
When the magnet shown in the diagram is moved towards the coil at a speed of 5 m s−1, the galvanometer shows a certain deflection to the right. How will the direction and magnitude of deflection change when the coil also moves with a speed of 5 m s−1: (a) in the direction of motion of the magnet? (b) in the opposite direction to the motion of the magnet?
To lift a load of 30 kgf, Suhas uses a single fixed pulley while Radha uses a single movable pulley. The displacement of efforts in both cases is equal. In an ideal situation calculate the ratio of: (a) the efforts in the two cases. (b) the potential energy gained by the loads in the two cases. (c) the efficiencies in the two cases.
A type of glass block has a refractive index of 1.8. (a) Calculate the speed of light in this glass. (Given speed of light in air = 3 × 108 m s−1) (b) If the width of this block is doubled, then what will be the speed of light in the block?
