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Science Answer the questions.[Phy-2M]

Electricity · CBSE STD 10 (CBSE - English Medium). 4 questions.

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Answer the questions.[Phy-2M]

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4 questions · timed · auto-graded

Question 12 Marks
What is the commercial unit of electrical energy? Represent it in terms of joules.
Answer
The commercial unit of electrical energy is kilowatt hour.

1kWh = 11000Wh

1000Wh = (1000 Joule/ second) × hour

$=1000\times\frac{\text{J}}{\text{S}}\times60\times60\text{s}$

= 3600 × 1000J

= 3.6 × 106J

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Question 22 Marks
Should the resistance of an ammeter be low or high? Give reason.
Answer
Resistance of ammeter should ideally be zero so that ammeter should not affect the flow of current in circuit. Hence, resistance of an ammeter should be very low because zero resistance is not possible in real life.
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Question 32 Marks
How does use of a fuse wire protect electrical appliances?
Answer
An electric fuse is a safety device used to protect circuits and appliances by stopping the flow of any unduly high electric current. It works on the principle of the heating effect of electric current.
It is made up of material having low melting point and connected in series with the circuit. When current passing through the fuse exceeds a certain limit then it melts. Due to which the circuit breaks and current stops flowing.
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Question 42 Marks
A child has drawn the electric circuit to study Ohm’s law as shown in Figure. His teacher told that the circuit diagram needs correction. Study the circuit diagram and redraw it after making all corrections.

Answer
Correct diagram is as follows.

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Answer the questions.[Phy-2M] - Science STD 10 Questions - Vidyadip