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CLASS - 10 SCIENCE IMPORTANT QUESTIONS OF MARK 1


QUESTION NO. 31

Name the source of direct current.

ANSWER NO. 31

Source of direct current are dry cells, DC generator, car battery, dry cell battery.

QUESTION NO. 32

What is the function of a galvanometer in a circuit?

ANSWER NO. 32

Galvanometer is an instrument that can measure the small electrical current by deflection in electrical circuit.

QUESTION NO. 33

What are the advantage of connecting electrical devices in parallel ?

 ANSWER NO. 33

 (1) The current is divided throughout all the electrical devices. The total resistance in the circuit is decreased and devices work properly.
(2) If one of the devices in parallel combination fuses or fails, then the other devices keep working without being affected.

 QUESTION NO. 34 

 Write the Joule law.

 ANSWER NO. 34

 The heats that is generator because of the current flow in an electric wre is described in Joule.
       The Joule's law shows that relationship between heat produced by a flowing electric current through a conduction.
        Q = IIRT                                      (I = current , R = Resistance , T = Time )

 QUESTION NO. 35 

 Write the unit of electric power.

 ANSWER NO. 35

 The S.I. unit of power is watt, one Joule per second.

 QUESTION NO. 36

 Filament of bulb is made of which material ?

 ANSWER NO. 36 

 Filament of bulb is made of tungsten.

 QUESTION NO. 37 

 Which material is the best conductor ?

 ANSWER NO. 37

 Silver

 QUESTION NO. 38

 What the disadvantage of the series circuit.

 ANSWER NO. 38

 (1)  If one components in the circuit fails, then all the components in the circuit fails because the broken circuit.

 (2) If more components in a series circuit, the greater the circuit's resistance.

 QUESTION NO. 39

 Which sources produce alternating current ?

 ANSWER NO. 39

 The sources are -
        Hydroelectric power Plants, thermal power generators, nuclear power generator. AC generators produces alternating current.

 QUESTION NO. 40

 Why electric fuse is used in domestic circuit.

 ANSWER NO. 40

 Whenever the heavy amount of current or an excessive current flow is there in an electrical circuit, the fuse melts and it open the circuit and disconnects it from power supply so electrical appliances can be saved.

 ALSO SEE IMPORTANT QUESTION OF 1 MARK

 From question no. 1 to 10

 From question no. 21 to 30

 From question no. 41 to 50

 From question no. 51 to 60

 From question no. 61 to 70

 From question no. 71 to 80

 From question no. 81 to 90

 From question no. 101 to 110

 From question no. 111 to 120

 From question no. 121 to 130

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