Objective

Question-2. Similar charges do to each other.

Ans- repel

Question-3. Unequal charges repel each other.

Ans- Attract

Question-4. What are the main reasons for the generation of passion?

Ans- transfer of electrons

Question-5. What is the SI unit of charge?

Ans- coulomb

Question-6. How much negative charge does an electron have?

Ans- 1.6 x 10‾¹⁹ coulombs

Question-7. What is the rate of flow of charge through a conductor called?

Ans- current

Question-8. What is the SI unit of electric current?

Ans- Ampere (A)

Question-9. What is the electric current measured with?

Ans- from ammeter

Question-10. What is the amount of electric current?

Ans- scalar

Question-11. When 1 coulomb of charge flows through a conductor in 1 second, then the current flowing through that conductor is called?

Ans- 1 ampere

Question-12. What is the value of 1 ampere?

Ans- 1 ampere = 1 coulomb / 1 second

Question-13. When the value of the current flowing through the conductor is very small, then in such a situation the current is expressed.

Ans- in milli ampere or micro ampere

Question-14. When the value of the current flowing through the conductor is very high, then in such a situation the current is expressed.

Ans- in kilo ampere or mega ampere

Question-15. How many electrons are in one coulomb charge?

Ans- 6.25 × 10¹⁸ electrons

Question-16. The amount of work done in bringing a unit positive charge from infinity to a point in the electric field is called?

Ans- electric potential

Question-17. What is the SI unit of electric potential?

Ans- Volt (V)

Question-18. What is the electric potential?

Ans- scalar

Question-19. What is the potential on earth?

Ans- zero (0)

Question-20. What is the amount of work done in moving a unit positive charge from one point to another in an electric field called?

Ans- potential difference

Question-21. What is the SI unit of potential difference?

Ans- Volt

Question-22. What is the difference between two potentials called?

Ans- potential difference

Question-23. If the work done in moving one coulomb of charge from one point to another is 1 joule, then the potential difference between those two points is called.

Ans- 1 Volt

Question-24. What is the value of one volt?

Ans- 1 volt = 1 joule / 1 coulomb

Question-25. What is a system that receives constant current called?

Ans- electric circuit

Question-26. With which instrument do we measure the current flowing in an electric circuit?

Ans- ammeter

Question-27. What is the ammeter connected to?

Ans- in series combination

Question-28. What is the instrument that measures the potential difference between two points of an electric circuit called?

Ans- voltmeter

Question-29. What is a voltmeter connected to?

Ans- in parallel

Question-30. What is the name of the current flowing in the same direction in an electric circuit?

Ans- Direct Current (D.C.)

Question-31. विधुत परिपथ में विधुत धारा जब विपरीत दिशा में बारी-बारी से प्रवाहित होती हैं तो उसे क्या कहते हैं?

Ans- Alternating Current (A.C.)

Question-32. Substances through which electric charges move easily from one place to another are called what?

Ans- Driver

Question-33. Conducting materials have number of free electrons.

Ans- very much

Question-34. Which material is the best conductor?

Ans- silver

Question-35. Specific conductivity of conductors due to increase in temperature—

Ans- decreases

Question-36. The substances through which electric charge cannot flow are called?

Ans- non-conducting

Question-37. Substances whose specific conductivity is between those of conducting materials and non-conducting materials, are called

Ans- semiconductor

Question-38. What are examples of gold, silver, copper, iron, etc.?

Ans- Driver

Question-39. Glass, rubber, plastic, dry wood etc. are examples of

Ans- non-conducting

Question-40. What are examples of germanium and silicon?

Ans- of semiconductor

Question-41. What is a semiconductor used for?

Ans- In the manufacture of memory devices for transistors and computers

Question-42. The property of a conducting material that opposes the current flowing through that material is called?

Ans- Resistance (R)

Question-43. What is the SI unit of resistance?

Ans- ohm (Ω)

Question-44. By applying a potential difference of 1 volt across both ends of a conductor, then a current of 1 ampere is passed through it, then it is called.

Ans- 1 ohm (Ω)

Question-46. Resistance as the length of the conductor increases—

Ans- increases

Question-47. The resistance of the conducting material is the length of the material—

Ans- directly proportional

Question-48. The resistance of a conducting material is the area of its cross-section—

Ans- inversely proportional

Question-49. The resistance of a block of unit length having unit cross-sectional section of the conducting material is called.

Ans- Specific Resistance (Resistivity)

Question-50. The inverse of the specific resistance is called.

Ans- specific conductivity

Question-51. What is the SI unit of specific conductivity?

Ans- per ohm per meter

Question-52. What is the partial increase in the resistance of a conducting material per unit temperature increase called?

Ans- Resistance Heating Coefficient (α)

Question-53. What is the SI unit of resistance temperature coefficient?

Ans- per ℃

Question-54. The electric current flowing through a conductor at a constant temperature is directly proportional to the potential difference between the ends of the conductor, which law is it called?

Ans- Ohm's law

Question-55. Ohm's law (Ω) describes the relationship between

Ans- difference between current and potential

Question-56. Electric current is of potential difference.

Ans- directly proportional

Question-57. Electric current is of resistance.

Ans- inversely proportional

Question-58. Temperature is kept in Ohm's law.

Ans- constant

Question-59. How are resistors connected?

उत्तर- two (in hierarchical and parallel order)

Question-60. What is energy carried from one form to another?

Ans- transformed

Question-61. What is the law of heat produced due to a current flowing through a conductor called?

Ans- joule's law of heat

Question-62. Who propounded Joule's law of heat?

Ans- by joule

Question-63. What is the electrical energy consumed by an electrical device in 1 second called?

Ans- electric power (P)

Question-64. What is the SI unit of electric power?

Ans- Watt (W)

Question-65. What is the rate of doing work in 1 joule per second called?

Ans- 1 watt

Question-67. What is the amount of electrical work called?

Ans- electrical energy

Question-68. What is the SI unit of electrical energy?

Ans- Joule (J)

Question-69. What is the commercial unit of electric energy?

Ans- kilowatt hour (kWh)

Question-70. What is 1 kilowatt called?

Ans- 1 unit electrical energy

Question-71. What effect of electric current does an electric bulb represent?

Ans- heating effect of electric current

Question-72. Electric bulb is made.

Ans- of glass

Question-73 . The filament inside an electric bulb is made of which metal?

Ans- of tungsten

Question-74 . What is the melting point of tungsten metal?

Ans- over 3000℃

Question-75. Which gas is filled inside an electric bulb?

Ans- inert gas

Question-76. Which metal wire is attached to the curved grooves of an electric heater?

Ans- nichrome key

Question-77. Nichrome has resistance and melting point.

Ans- Too much

Question-78. The heating element is made in electric iron.

Ans- of nichrome

Question-79. Electric fuses are a device.

Ans- of security

Question-80. Used to protect circuits from overloading and shorting.

Ans- of electric fuse

Question-81. What type of wire is used in an electric fuse?

Ans- The wire which has low melting point.

Question-82. The value at which the fuse fails as soon as the strength of the current is reached is called what?

Ans- Fuse Capacity

Question-83. What is it called when a large amount of current is drawn through a circuit?

Ans- overloading

Question-84. When the live wire (hot wire) and neutral wire (cold wire) come into contact, in such a situation the resistance of the circuit becomes very low, due to which a large amount of current flows, then this phenomenon is called Huh.

उत्तर- short circuit

Question-85. Which one must be used when using electrical equipment?

Ans- ground wire

Question-86. What alloy is an electric fuse made of?

Ans- copper and tin

Question-87. The human body has resistance.

Ans- about 30,000 ohms (Ω)

Question-88. What is the Earth's potential?

Ans- zero (0)

Question-89. 1 H.P. (horsepower) is equal to how many watts?

Ans- 746 watts

Question-90. When an electric current flows through a conducting wire, the moving particles are.

Ans- Electron

Question-91. Which of the following is a micro ampere current?

(a) 10‾⁴ A (b) 10‾⁵ A (c) 10‾⁶ A (d) 10‾⁷ A

Ans- (c) 10‾⁶ A

Question-92. Electric circuit has power.

Ans- V²/R

Question-93. The kilowatt hour (kWh) is the unit.

Ans- of electrical energy

Question-94. kilowatt hour (kWh) is equal to

Ans- 1000 Unit

Question-95. The electrical circuit in the houses is grouped.

Ans- in parallel

Question-96. The formula for Ohm's law is

Ans- V = I × R

Question-97. 1 Coulomb electric charge is made up of how many protons?

Ans- 1.6 × 10¹⁹

Question-98. The relationship between the potential difference V, resistance R and the current I flowing between the ends of a conductor is-

Ans- R = V/I

Question-99. If n resistors of r ohm resistance are connected in parallel, the equivalent resistance will be.

Ans- nr

Question-100. There is a formula to find the resistance of a coil.

Ans- R = V/I

Question-101. 1 kilowatt-hour is equal to which of the following?

Ans- 3.6 × 10⁶ joule

Question-102. The scale of a voltmeter has 20 division marks between 0 V and 1V, so the small modulus of that voltmeter is

Ans- 0.05 V

Question-103. The value of the current drawn by the coil of an electric heater whose resistance is 55Ω, from a source of 220 V will be.

उत्तर- 4 ampere

Question-104. A current of 2Ω A flows through a bulb at 220 V, then the resistance of the filament will be.

Ans- 220 Ω

Question-105. A 100 W electric bulb is connected to a 250 V electric mains. What will be the value of current flowing through the bulb?

Ans- 2.5 ampere

Question-106. What type of current is received from the battery?

Ans- Direct Current (D.C.)

Question-107. What will be the value of equivalent resistance when the resistors of 3Ω and 6Ω are connected in parallel (in parallel order)?

Ans- 2 Ω

Question-108. What will be the value of current in the circuit when 1Ω and 2Ω resistors are connected in series to a 6 V battery?

Ans- 2 ampere

Question-109. The value of current in the circuit at the time of short circuit-

Ans- increases a lot.

Question-110. What will be the equivalent resistance when two resistors of 10Ω and 20Ω are connected in series?

Ans- 30 Ω

Question-111. What will be the resistance of the filament of a 100 W - 220 V electric bulb?

Ans- 484 Ω

Question-112. An electric bulb is marked 220 V and 100 W. What is the power consumed by it when it is operated on 110 V?

Ans- 50 W

Question-113. 4Ω resistance produces 100 joules of heat per second, then find the potential difference between the ends of the resistance.

Ans- 20 V

Question-114. What is the unit of resistivity of a conductor?

Ans- Ωm

Question-115. Which instrument does not have a plus (+) and a minus (-) sign?

Ans- in horoscope

Question-116. Whose value is a constant in Ohm's law?

Ans- of resistance (R)

Question-117. Which device receives alternating current?

Ans- Generator

Question-118. By what effect of electric current do electric bells work?

Ans- Magnetic effect

Question-119. The resistance of the conductor due to increase in temperature-

Ans- Grows.

Question-120. What causes electrical accidents in homes?

Ans- by short circuit

Question-121. What is the frequency of alternating current produced in India?

Ans- 50 Hz

Question-122. What is the color of neutral wire in a domestic electric circuit?

Ans- Black

Question-123. After decreasing the number of resistors connected in parallel, the total resistance of the connected resistors—

Ans- Happens.

Question-124. The resistance of a conductor does not depend.

Ans- on the current flowing in the conductor