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) X is a company fuse or pole fuse. It does not have a fixed current rating; its rating depends on the load capacity of the connection.
(b) Z connects and disconnects the live and neutral lines simultaneously, whereas a switch used for a domestic appliance connects and disconnects only the live line.
(c) The unit is kWh.
More ICSE Easy level questions
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 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.
(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)
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 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)
Draw a block and tackle system of pulleys with velocity ratio equal to 3.
Curium is a radioactive element with the symbol named in honour of Madam Curie. The graph of number of protons vs number of neutrons for some elements is shown below: (a) Which point on the graph indicates the element Cm? (b) Which point on the graph indicates daughter nucleus after Cm undergoes radioactive decay of 1α followed by 2β? (c) State the mass number of the daughter nucleus.
(a) Name the radiations: (1) for which a quartz prism is used to study the spectrum. (2) which are used in remote sensing devices. (3) which are used in traffic signals in India. (b) Name one property common to all electromagnetic radiations.
Three levers X, Y and Z of equal lengths are shown in the diagram. (a) Which class of lever do these belong to? (b) Among these (X, Y or Z), which one will give the maximum mechanical advantage? Justify your answer.
Akash takes a uniform metre scale and suspends a weight of 2 N at one end ‘X’, and a weight of 5 N on the other end ‘Y’. He then balances the ruler horizontally on a knife edge placed at 70 cm from X. Draw a diagram of the arrangement and calculate the weight of the ruler.
30 g of ice at 0°C is used to bring down the temperature of a certain mass of water at 70°C to 20°C. Find the mass of water. Specific heat capacity of water = 4.2 J g⁻¹ °C⁻¹ and specific latent heat of ice = 336 J g⁻¹.
