Please select a subject first
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Choose the correct option from the bracket and explain the statement giving reason.
(Oxidation, displacement, electrolysis, reduction, zinc, copper, double displacement, decomposition)
To prevent rusting, a layer of ______ metal is applied on iron sheets.
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What is the reaction called when oxidation and reduction take place simultaneously? Explain with one example.
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Tell the odd one out. Give proper explanation.
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Explain the construction and working of the following. Draw a neat diagram and label it.
Electric motor
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| Reactants | Products | Type of chemical reaction |
| BaCl2(aq) + ZnSO4(aq) | H2CO3(aq) | Displacement |
| 2AgCl(s) | FeSO4(aq) + Cu(s) | Combination |
| CuSO4(aq) + Fe(s) | BaSO4↓ + ZnCl2(aq) | Decomposition |
| H2O(l) + CO2(g) | 2Ag(s) + Cl2(g) | Double displacement |
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Write a short note.
Structure of the modern periodic table.
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Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
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How does the short circuit form? What is its effect?
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Give a scientific reason.
Tungsten metal is used to make a solenoid type coil in an electric bulb.
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Give Scientific reason
In the electric equipment producing heat e.g. iron, electric heater, boiler, toaster etc, an alloy such as Nichrome is used, not pure metals.
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Give a scientific reason:
For electric power transmission, copper or aluminium wire is used.
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Give Scientific reason.
In practice, the unit kWh is used for the measurement of electrical energy, rather than joule.
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Identify the figure and give its use.
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Identify the figure and give its use.
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Heat energy is being produced in a resistance in a circuit at the rate of 100 W. The current of 3 A is flowing in the circuit. What must be the value of the resistance?
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Solve the following example.
Two tungsten bulbs of wattage 100 W and 60 W power work on 220 V potential difference. If they are connected in parallel, how much current will flow in the main conductor?
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Who will spend more electrical energy? 500 W TV Set in 30 mins, or 600 W heater in 20 mins?
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An electric iron of 1100 W is operated for 2 hrs daily. What will be the electrical consumption expenses for that in the month of April? (The electric company charges Rs 5 per unit of energy).
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Observe the figure and write accurate conclusion regarding refraction of light.
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What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
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