Rajasthan Board Class 10 Science Chapter 10 Solution Electric Current RBSE Class 10 Science Solution for Chapter 10
Objective type questions.
(1.) 2 ampere current folws in a conductor connected with a %V battery. Find the resistance of the conductor.
a) 3 ohm
b) 2.5 ohm
c) 10 ohm
d) 2 ohm
Ans- b) 2.5 ohm
(2.) Resistivity depends on which of the following ?
a) Length of the conductor
b) Cross section are of the conductor
c) Material of the conductor
d) None of these.
Ans c) material of the conductor.
(3.) Volt is a unit of
a) Current
b) Potential differences
c) Charge
d) Work
Ans-b) potential differences.
(4.) Three conducting wires of 1,2,4 ohms are connected in series is an electrical circuit. What will be the equivalent resistance?
a) Less than 1 ohm
b) Less than 3 ohm
c) More than 1ohm
d) More than 3 ohm
Ans- d) more than 3 ohm
(5.) The frequency of alternating current in India is
a) 45 hertz
b) 50 hertz
c) 55 hertz
d) 60 hertz
Ans- b) 55 hertz
(6.) Resistance of difference values are connected in parallel and connected with an electrical sources. In each of the resistor-
a) Current and potential difference will be different.
b) Current and potential difference will be same
c) Current will be different but potential difference will be same
d) Current will be same but the potential difference will be different.
Ans- c) current will be different but potential will be same
(7.) 2 coulomb charges passes through an electrical circuit in 0.5 second find the value of electric current in ampere.
a) 1 ampere
b) 4 ampere
c) 1.5 ampere
d) 10 ampere
Ans- b) 1.5 ampere
(8.) Which of the device does not depend on thermal effect of current
a) Heater
b) Electric current
c) Toaster
d) Refrigerator
Ans- d) refrigerator
Very short type questions.
(9.) What is the unit of specific resistance or resistivity?
Ans- ohm-meter.
(10.) Define the electrical current
ans- the amount of charge passed from a point per unit time is called electric current.
(11.) What is potential difference?
Ans- the difference of electrical potential between two points is called potential difference.
(12.) What is 1 ohm resistance?
Ans- when the current of 1amp is passed through a conductor and the developed potential difference is 1 volt then the resistance is known as 1ohm resistance.
(13.) How resistance depends upon cross section area?
Ans- resistance and corss sectional area is inversely proportion so they depends.
(14.) Define resistivity.
Ans-the resistance of wire of unit length and unit cross sectional area is known as resistivity.
(15.) What do you mean by electric power?
Ans- the electric power is the rate per unit time at which electrical energy is transferred by an electric circuit.
(16.) 100 W -220 W is written on an electric bulb what does it means?
Ans- it means the bulb has the power of 100 watts or 220 watts
(17.) How electrical combination is made at homes?
Ans- alternating current is used in house.
Short type questions.
(18.) What is the difference between series combination and parallel combination?
Series combination | Parallel combination |
In this type of combination the second end of the first wire is combined with the first end of the scond wire and second end of the second wire is combined with the first end and third conducting wire. | In this type of combination all the resistance are connected in such a ways that the one end of each of them is connected to one point and each other end of each of them is connected to another point. |
In this series combination the same current flows from all resistance while the potential difference across their ends is different, | In this series of combination the propotional difference across all the resistance is same but the current in each of the resistance id different. |
(19.) What is electric power? Write the necessary formula for is?
Ans- the electric power is the rate per unit time at which electrical energy is transferred by an electrical circuit. The power= voltage inot current.
(20.) Define electrical potential and potential difference.
Ans- the different of electrical potential at two points is known as electrical potential and there difference is known as potential difference.
(21.) What is the difference between alternating current generator and direct current generator.
Ans- the alternating current generator is a device that transformed mechanical energy to alternating electric energy and the direct current generator is also converting mechanical energy into electrical energy but the direction of the current obtained from electrical remains constant .
(22.) Write the right hand rule.
Ans- if the conductor wire is held by the right hand such that the thumb is in the direction of the flow of current then the curved fingers will represent the direction of magnetic field this is known as right hand rule.
(23.) Find the no of joules in 1 kilowatt hour.
Ans- the no of joules in 1 kilo watt is 36 into 10 Joule.
(24.) Write joule’s law of heating.
Ans- the heat generated in the resistance wire is
a) Proportional to the square of the current flowing in the wire. Hto I2
b) Proportional to the resistance H to R
c) Proportional to the time t of flow current H to t
This three are called as joule’s laws of heating.