CBSE Class 8 chemicaleffectsofcurrent — practice questions
18 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 8 chemicaleffectsofcurrent in the app →Materials that allow electric current to pass through them are called:Most liquids that conduct electricity are SOLUTIONS of:Pure (distilled) water is a:The process of depositing a layer of any desired metal on another material by means of electricity is called:LEDs glow even with very small currents. While connecting an LED in a circuit, the LONGER lead must be connectWhy should you NEVER touch an electrical switch or appliance with wet hands?When an electric current flows through a copper sulphate solution between two copper electrodes, you will obseIn 1800, William Nicholson passed an electric current through water and observed two gases formed at the electA tester is dipped into two liquids A and B. The bulb glows BRIGHTLY for A and DIMLY for B. The correct concluThe figure shows the electroplating set-up: two copper plates dipped in copper sulphate solution, connected toWhy is chromium often used as the OUTER plating on car parts, bath taps and bicycle handlebars?Tin cans used for food storage are made by:During a heavy downpour, an electrician should NOT attempt outdoor electrical repairs primarily because:Three small caps each contain water with a different solute. Cap 1: lemon juice (acid). Cap 2: caustic soda (bBefore firemen turn their water hoses on a building fire, they shut off the main electrical supply to that areIn the electrolysis of water, the volume of hydrogen produced is roughly TWICE the volume of oxygen. The reasoPure copper for electrical use is produced INDUSTRIALLY using electroplating in reverse, called 'electrorefiniA tester has a bulb that does NOT glow when dipped in a particular liquid. Which of the following could accoun