**MULTIPLE-CHOICE QUESTIONS**

*INDEX-TOPIC SEARCH

__SELECT THE CORRECT ALTERNATIVE__:

- Who had patented more than 1000 inventions during his life time ?
- Edison
- Volta
- Ampere
- Faraday

- The unit of electric current is _______.
- coulomb
- volt
- ampere
- ohm

- The unit of electric charge is _______.
- coulomb
- volt
- ampere
- ohm

- The unit of electric current is _______.
- coulomb
- coulomb/sec
- coulomb-sec
- coulomb/volt

- 1 ampere = _______.
- coulomb sec
- coulomb/sec
- volt/sec
- ohm/sec

- Work done on an electric charge is stored in it as _______.
- potential energy
- kinetic energy
- thermal energy
- nuclear energy

- The unit of electrical potential is _______.
- coulomb/joule
- joule/coulomb
- watt/coulomb
- joule/ampere

- The unit of electrical potential is _______.
- ampere
- coulomb
- volt
- watt

- _______ is not essential to obtain electric current.
- Free electrons
- Potential difference
- Electric circuit
- potential

- _______ invented a simple electrochemical cell.
- Archimedes
- Edison
- Volta
- Coulomb

- _______ energy is converted into electrical energy in Voltaic cell.
- Thermal
- Mechanical
- Kinetic
- Chemical

- The unit of resistance is _______.
- volt/ampere
- coulomb/second
- volt/coulomb
- ampere/volt

- The unit of resistance is _______.
- coulomb
- volt
- ohm
- ampere

- When resistors are connected in series _______.
- voltage drop is uniform
- current is uniform
- both voltage and current are uniform
- neither of two is uniform

- When resistors are connected in parallel _______.
- voltage drop is uniform
- current is uniform
- both voltage and current are uniform
- neither of two is uniform

- Three resistors of 6 Ω, 12 Ω and 12 Ω are connected in parallel. Their equivalent resistance is _______.
- 6 Ω
- 12 Ω
- 3 Ω
- 1/3 Ω

- Which of the following is not correct for electrical work ?
- W = VQ
- W = VIt
- W = I
^{2}Rt - W = I
^{2}RQ

- _______ is not a unit of energy.
- joule
- watt
- watt second
- kWh

- 1 joule = _______.
- 1 watt-second
- 1 watt/second
- 1 coulomb/second
- 1 unit

- Which of the following is not correct ?
- P = W/t
- P = I
^{2}R - P = WI
- P = VI

- Silicon is a/an _______.
- conductor
- insulator
- semiconductor
- superconductor

- Who discovered electron ?
- Coulomb
- Volta
- Ampere
- Thomson

- 1 A = _______ mA
- 100
- 10
^{3} - 10
^{(-3)} - 10
^{(-6)}

- Ohm's law states that
- resistance increases as current increases
- resistance increases as voltage increases
- current increases as voltage increases
- current increases as resistamce increases

- Equivalent resistance of resistances in parallel is _______.
- smaller than the smallest resistance
- larger than the largest resistance
- an average of all resistances
- algebraic sum of all resistances

- 1 unit of domestic energy is _______.
- 1 joule
- 1 watt second
- 3.6 x 10
^{6}j - 3.6 x 10
^{6}kwh

- Three resistors of equal value are connected in parallel.The circuit current is 3 A.Then the current passing through each resistor is _______.
- 3 A
- 1 A
- 9 A
- 1/3 A

- How much electric charge is present on 100 protons ?
- 6 x 10
^{-19}C - 6 x 10
^{-17}C - 1.6 x 10
^{-19}C - 1.6 x 10
^{-17}C

- 6 x 10
- Pure water is electrically...
- a good conductor
- a bad conductor
- a semiconductor
- a super conductor

- The frequency of direct current in India is______ Hz.
- 0
- 50
- 60
- 220

**ANSWERS**

(1) A (2) C (3) A (4) B (5) B (6) A (7) B (8) C (9) D (10) C (11) D (12) A (13) C (14) B (15) A (16) C (17) D (18) B (19) A (20) C (21) C (22) D (23) B (24) C (25) A (26) C (27) B (28) D (29) B (30) A

**SHORT QUESTIONS**

__ANSWER IN SHORT__:

- What type of charge does a glass rod acquire when it is rubbed with silk cloth ?
**ANS:**A glass rod acquires positive charge when it is rubbed with silk cloth - what is an electric charge ?
**ANS:**An electric charge is a fundamental property associated with protons and electrons. - What is the unit of electric charge ?
**ANS:**The unit of electric charge is coulomb. - What is the magnitude of charge on proton ?
**ANS:**The magnitude of charge on proton is 1.6 x 10^{(-19)}. - What is the magnitude of charge on electron ?
**ANS:**The magnitude of charge on electron is 1.6 x 10^{(-19)}. - Mention some metals which contain maximum free electrons.
**ANS:**Copper, aluminium and silver are the metals containing maximum free electrons. - What are conductors ?
**ANS:**Conductors are materials which conduct electricity readily. - What are insulators ?
**ANS:**Insulators are materials which do not conduct electricity. - Give some examples of insulators.
**ANS:**Rubber, leather, plastic, glass, etc. are examples of insulators. - Define : Electric current.
**ANS:**Electric current is the net amount of charge that passes through an area(cross-sectional area) of the conductor per unit time. - Who gave the concept of electron ?
**ANS:**Sir J.J.Thomson gave the concept of electron. - How many electrons should flow in one second to contribute an electric current of 1 ampere ?
**ANS:**6.25 x 10^{18}electrons should flow in one second to contribute an electric current of 1 ampere. - What should be done to get electric current ?
**ANS:**Energy should be provided o the free electrons in a conductor to obtain electric current. - Define : Electric potential.
**ANS:**At a point in an electric field, the electrical potential energy per unit charge is called the electrical potential at that point. - What is the direction of actual current ?
**ANS:**The direction of actual current is from cathode to anode. - What is the direction of conventional current ?
**ANS:**The direction of conventional current is from anode to cathode. - Define : Electrical potential difference.
**ANS:**The work done to move a unit electric charge from one point of a conductor to another point of that conductor is called the electrical potential difference between these two points. - State Ohm's law.
**ANS:**The current passing through a conductor is directly proportional to the potential difference (voltage drop) across the conductor. - Define : 1 ohm resistance.
**ANS:**If a potential difference of 1 volt between two terminals of a conductor causes a current of 1 ampere in it, then the resistance of the conductor is 1 ohm. - On which factors does the heat produced in a conductor depend ?
**ANS:**The heat produced in a conductor depends on the electric current and the resistance in it. - A fuse wire has a low melting point.True or false ?
**ANS:**Yes, this is a true statement. - Define : Electric Power.
**ANS:**Electrical energy consumed per unit time is called electric power. - What is the unit of power ?
**ANS:**The unit of power is watt (or, joule/sec). - How many kj equal 1 kwh ?
**ANS:**3.6 x 10^{3}kj equal 1 kwh. - How many joule equal 1 kwh ?
**ANS:**3.6 x 10^{6}kj equal 1 kwh. - Pure water does not conduct electricity. True or false ?
**ANS:**True, pure water does not conduct electricity. - The unit of electric charge is faraday. True or false ?
**ANS:**False, the unit of electric charge is coulomb. - What are electrolytes ?
**ANS:**The solutions that conduct electricity are known as electrolytes. - To which terminal is the object connected during electroplating ?
**ANS:**The object is connected to the negative terminal(cathode) during electroplating. - What is electroplating ?
**ANS:**The process of depositing a desired metal on another mettalic object by using electricity is called electroplating. - A fuse works on the principle of chemical effect of electric current. True ?
**ANS:**No, a fuse works on the principle of thermal effect of electric current. - How do we get flow of electrons in a conductor ?
**ANS:**We get flow of electrons in a conductor by connecting the conductor to a source of energy(a cell or battery) which drives free electrons in a definite direction. - Current flows in a wire.Can we call the wire charged ? Why ?
**ANS:**No. Because the flow of current in a wire does not add or remove any charged particles in it. - What causes resistance in a conductor ?
**ANS:**The collision of free electrons moving in a conductor with the atoms or molecules of the conductor causes resistance in a conductor. - Write the equations for equivalent resistance R of two resistors R
_{1}and R_{2}connected in (i)series (ii)parallel.**ANS:**(i)Series: R = R_{1}+ R_{2}(ii)Parallel : (1/R) = (1/R_{1}) + (1/R_{2}) - Define the unit of electrical energy.
**ANS:**The unit of electrical energy is joule and it is defined as : the electrical energy consumed when one coulomb of charge passes through a point in a conductor having 1 volt potential difference. - What type of wire should be used in a fuse ?
**ANS:**A wire made from a low melting point metal/alloy having high resistance should be used in a fuse. - How much electric energy is spent if 200 units are consumed ?
**ANS:**200 kwh or 200 x (3.6 x 10^{6}) = 7.2 x 10^{8}j energy is spent if 200 units are consumed. - What is the principle of electroplating ?
**ANS:**The principle of electroplating is that a metal can be deposited on the surface of another metal with the help of electrolysis. - What is electrolysis ?
**ANS:**The process of separation of ions of a substance with the help of electric current is called electrolysis. - How much electric charge is present on 100 neutrons ?
**ANS:**Zero. - Which effect of electric current is used in fuse ?
**ANS:**The heating effect of electric current is used in fuse. - Write an expression for the amount of heat produced in a wire of resistance R and carrying current I for time t.
**ANS:**Heat produced = I^{2}Rt - What is meant by saying that the potential difference between two points is 1 volt ?
**ANS:**The meaning of the statement is that 1 joule work needs to be done to move 1 coulomb of charge from one point to the another.

## 1 comment:

such kind of simple questions i gave these questions to to my 5 years bro to solve it really it took no time haha while solving so that iz why hats off to u sir such kind of simple questions r appreciated....

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