Please select a subject first
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A coil is connected to a galvanometer. When the N-pole of magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:
the N-pole is removed?
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A coil is connected to a galvanometer. When the N-pole of magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:
the S-pole is inserted?
Concept: undefined >> undefined
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A coil is connected to a galvanometer. When the N-pole of magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:
the magnet is a rest in the coil?
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If fuse of 250 mA, 500 mA, 1 A, 5 A and 10 A were available, which one would be the most suitable for protecting an amplifier rated at 240 V, 180 W?
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How should the electric lamps in a building be connected so that the switching on or off in a room has no effect on other lamps in the same building?
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Why are metals called electropositive elements whereas non-metals are called electronegative elements?
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State whether the following statement is true or false:
Non-metals react with dilute acids to produce a gas which burns with a 'pop' sound.
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From amongst the metals sodium, calcium aluminium, copper and magnesium, name the metal:
(i) which reacts with water only on boiling, and
(ii) another which does not react even with steam.
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What changes in the colour of iron nails and copper sulphate solution do you observe after keeping the iron nails dipped in copper sulphate solution for about 30 minutes?
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What name is given to those metal oxides which show basic as well as acidic behaviour?
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Name two metals which form amphoteric oxides.
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A copper coin is kept immersed in a solution of silver nitrate for some time. What will happen to the coin and the colour of the solution?
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Name the metal which has been placed at the bottom of the reactivity series.
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Name the metal which has been placed at the top of the reactivity series.
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Name the metal which has been placed just below copper in the reactivity series.
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Which of the two metals is more reactive: copper or silver?
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Write equation for the reaction of sodium with oxygen.
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Write equation for the reaction of magnesium with oxygen.
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What will happen if a strip of zinc is immersed in a solution of copper sulphate?
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What will happen if a strip of copper is kept immersed in a solution of silver nitrate (AgNO3)?
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