CBSE Science Class 7

Electric Current and its Effect

Electric Current and its Effect - Chapter Wise CBSE Solved Question and Answer Based On NCERT

Short Q&A:

Q1: Differentiate between electric current and electric circuit.
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Q2: Explain the formation and uses of battery.
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Q3: Explain the function of cell in a circuit.
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Q4: An electrician is carrying out some repairs in a building. He wants to replace a fuse by a piece of wire. Would you agree with the electrician? Give reasons for your response.
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Q5: How fuses are useful?
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Q6: Can we use an electromagnet separating plastic bags from a garbage heap? Explain.
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Q7: Look at the figure given below and answer whether the compass needle will show deflection or not when the switch in the circuit shown is closed?
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Q8: When the current is switched on through a wire, a compass needle kept nearby gets deflected from its north-south position. Explain.
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Q9: Write short notes on heating effects of electric current.
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Q10: Distinguish between an electric motor and generator?
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Q11: Write short notes on magnetic effects of electric current
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Q12: What are filaments of a bulb and a heater made up of?
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Q13: State the factors on which amount of heat produced depends?
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Q14: Why does electric current show magnetic effect?
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Q15: Why are fuse wire not used in circuit containing electric cell?
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Q16: Why does electric current show heating effect?
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Q17: What is magnetic field?
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Q18: What are the patterns of magnetic field lines inside and outside of a solenoid?
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Q19: State the principle of working of electric generator. What are its important parts?
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Q20: Two magnetic lines of force don’t intersect each other. Explain why?
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Q21: Give two methods by which we can increase the strength of magnetic field produced by a circular coil carrying current?
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Q22: The patterns of magnetic field lines inside a solenoid are parallel straight lines. What does this indicate?
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Q23: The patterns of magnetic field lines outside a solenoid are parallel curved lines. What does this indicate?
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Q24: State thefactors on which the force experienced by a current carrying conductor placed in a uniform magnetic field depends upon?
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Q25: Why mostly all electrical home appliances like refrigerator, toaster etc. are provided with a wire having green insulation?
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Q26: Write short notes on Short Circuiting.
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Q27: Write short notes on Overloading.
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Q28: Mention the differences between an electromagnet and a permanent magnet.
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Q29: What are the properties of magnetic field due to a current through a straight wire?
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Q30: State few characteristics of magnetic field lines.
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Q31: An electron enters a magnetic field at right angles to it as shown in fig. The direction of the force acting on the electron will be:
(a) to the right (b) to the left (c) out of the page (d) into the page
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Q32: It is established that an electric current through a metallic conductor produces a magnetic field around it. Is there a similar magnetic field produced around a thin beam of moving (i) alpha particles, (ii) neutrons? Justify your answer.
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Chapter 14 Electric Current and its Effect