1.When an electric current flows through a copper wire AB s shown in figure, the wire (a) deflects a magnetic needle placed near it (b) becomes red hot (c) gives electric shock (d) behaves like a fuse 2.Which of the following precautions need not be taken while using electric gadgets/ appliances/circuit? (a) We should never touch a lighted electric bulb connected to the mains (b) We should never do experiment with the electric supply from the mains or a generator or an inverter (c) We should never use just any wire or strip of metal in place of a fuse (d) We should never turn the switch in ON position 3. When a switch is in OFF position, (i) circuit starting from the positive terminal of the cell stops at the switch (ii) circuit is open (iii) no current flows through it (iv) current flows after sometime Choose the combination of correct answers from the following. (a) All are correct (b) (ii) and (iii) are correct (c) Only (iv) is correct (d) (i) and (ii) are correct 4.Which of the following characteristic is most suitable material for making the care of an electromagnet? (a) Brass (b) Aluminium (c) Iron (d) Steel 5.The coil of wire contained in heater is known as (a) circuit (b) component (c) spring (d) element
6.Case Based Question:
Rama saw her mother running microwave oven, electric cooker and mixer grinder from a single
socket. She immediately rushed to her mother and reminded her of overloading and its
consequences. Rama’s mother immediately turned off the switch and connected them one by one
according to her need. She felt very happy for Rama for her presence of mind.
(a) What is overloading?
(b) What are the consequences of overloading?
(c) What role do MCB plays in case of overloading?
(d) What value of Rama is shown here?
7.Picture Based Question:
In the circuit shown in the given diagram:
i) Would any of the bulb glow when the switch is in the ‘OFF’ position?
ii) What will be the order in which the bulbs A,B and C will glow when the switch is moved to the
‘ON’ position?
8. Solve the jumbled words to get some terms related to electricity.
a) TBTAYER b)SFEU c) HTRCO d)HICWTS
9.Sanjay studied under a bright light of the bulb in his room. To lower the brightness of the light,
he covered the bulb with a piece of cloth. Has he taken the right step? Give a reason to justify
Answers
Answer:
1 (a) deflects a magnetic needle placed near it
2 D We should never turn the switch in ON position.
3.B (ii) and (iii) are correct
4 (c) Iron
5 (d) element
6 (a) When excessive amount of electric current passes through the wire, excessive heating take place, this is called overloading.
(b) Overloading can damage the circuit of house. It can also lead to fire.
(c) When there is overloading of current, MCB trips and switches off, which in turn cut off the supply of electricity and thus protect us from damages due to overloading of current.
(d) Rama is an intelligent, quick decision maker and helpful girl.
7 (i) No, none of the bulbs will glow when the switch is in the 'OFF' position because the current will not flow through the circuit.
(ii) When the switch is turned to the 'ON' position, then all the bulbs will glow at once because they all are connected to the same battery and switch in the same circuit.
8 a battery, b Fuse, c Torch, d Switch
9 No
Explanation:
because bulb not only gives light but also heat so, it can get fire
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