Class 10 Science Chapter 12 MCQ Online Test for 2021-2022
| Class: 10 | Science |
| Chapter: 12 | Electricity |
| Contents: | MCQ Online Tests with Answers and Explanation |
Class 10 Science Chapter 12 MCQ with Answers for 2021-22
Class 10 Science Chapter 12 MCQ Online Test with solutions and answers. There are more than 70 questions in the form of MCQs covering the entire chapter 12 of Class 10 Science. Most of the questions are confined to Latest NCERT Books for class 10 Science issued for session 2021-2022.
Q1
Consider the following statements and choose the correct one:
[A]. Opposite charges attract each other.
[B]. Similar charges repel each other.
[C]. The SI unit of electric charge is coulomb.
[D]. All the above
Answer: Option D
Explanation:Here, all these statements are correct. Hence, your answer will be option [D].
Q2
Renuka is completed her science chapter where she wrote some statements. She wants to know whether the statements are correct or not? Renuka wants to take help from you:
[A]. Those substances through which electricity can flow are called conductors.
[B]. Those substances through which electricity cannot flow are called insulators.
[C]. The presence of free electrons in a substance make it a conductor of electricity.
[D]. In static electricity the electric charges flows to one end to another end.
Answer: Option D
Explanation:In static electricity, the electric charges remain at rest or stationary, they do not move. The charge acquired by a glass rod rubbed with silk cloth and the charge acquired by an ebonite rod rubbed with woolen cloth are example of static electricity.
Q3
In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
[A]. Brightness of all the bulbs will be the same
[B]. Brightness of bulb A will be the maximum
[C]. Brightness of bulb B will be more than that of A
[D]. Brightness of bulb C will be less than that of B
Answer: Option C
Explanation:In an electrical circuit, three incandescent bulbs A, B and C of rating 40 W, 60 W, and 100 W are connected in parallel to and electrical source, then the bulb with the highest wattage glows with maximum brightness. Thus, the brightness of bulb B (100 W) is maximum.
This brightness different bulks are in following order:
B100 > B60 > B40
Q4
A cylindrical conductor of length l and uniform area of cross section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross section
[A]. A/2
[B]. 3A/2
[C]. 2A
[D]. 3A
Answer: Option C
Explanation: In first case,
Resistivity of the conductor, ƿ = RA¹/ l
In second case,
Resistivity of the conductor, ƿ = RA¹/ 2l
Therefore, for same material, resistivity of the conductor will be same.
So, on substituting the value of ƿ in Eq. (ii), we have
RA/I = RA¹/2I = A¹ =2A
Q5
In a science quiz competition, Neha are asked a question where she had to choose the statement which was/were correct?
[A]. The property of a conductor due to which it opposes the flow of current through it is called resistance.
[B]. The resistance of a conductor depends on length, thickness, nature of material and temperature of the conductor.
[C]. 1 ohm is the resistance of a conductor such that when a potential difference of 1 volt is applied to its ends, a current of 1 ampere flows through it.
[D]. All the above.
Answer: Option D
Explanation:Here, all these statements are correct. Hence, your answer will be option [D].
Q6
Priya is writing some statements, choose the incorrect statement and help him:
[A]. Those substance which have very low electrical resistance are called good conductors.
[B]. Those substances which have comparatively high electrical resistance, are called resistors.
[C]. Those substances which have infinitely high electrical resistance are called insulators.
[D]. The heating element of electric iron is made of nichrome wire which is an insulator.
Answer: Option D
Explanation:The heating element of electric iron is made of nichrome wire which is a resistor.
The electric wires are made of copper which is a good conductor but their covering is made of plastic which is an example of insulator.
Q7
Consider the following statements and choose the correct one:
[A]. The combined resistance of any number of resistance connected in series is equal to the sum of the individual resistances.
[B]. When two or more resistances are connected between the same two points, they are said to be connected in parallel.
[C]. When two or more resistances are connected end to end consecutively, they are said to be connected in series.
[D]. All the above.
Answer: Option D
Explanation:Here, all these statements are correct. Hence, your answer will be option [D].
Q8
Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?
[A]. Electric power is the electrical energy consumed per second.
[B]. When an electrical appliance consumes electrical energy at the rate of 1 joule per seconds, its power is said to be 1 watt.
[C]. The rate at which electrical work is done or the rate at which electrical energy is consumed, is called electric power.
[D]. Electric power = Potential difference / Current
Answer: Option D
Explanation:The power in watts is found by multiplying the potential difference in volts by the current in amperes. We can write down the above formula for electric power in words as:
Electric power = Potential difference x Current
Q9
Tanu is writing some statements but she confused to know whether the statements are correct or not? If you know the answer to this question, then tell her:
[A]. 1 watt hour is the amount of electrical energy consumed when an electrical appliance of 1 watt power is used for 1 hour
[B]. One kilowatt hour is the amount of electrical energy consumed when an electrical appliances having a power rating of 1 kilowatt is used for 1 hour
[C]. 1 kilowatt hour is equal to 3.6 X 10 to the power 16, joules of electrical energy.
[D]. None of the above.
Answer: Option C
Explanation:1 kilowatt hour is equal to 3.6 X 10 to the power 6, joules of electrical energy.
One kilowatt hour is the amount of energy consumed at the rate of 1 kilowatt for 1 hour.
1 kilowatt hour = 36,00,000 joules (or 3.6 X 10 to the power 6).
Q10
One coulomb charge is equivalent to the charge contained in:
[A]. 2.6 × 10 to the power 19 electrons
[B]. 6.2 × 10 to the power 19 electrons
[C]. 2.65 × 10 to the power 18 electrons
[D]. 6.25 × 10 to the power 18 electrons
Answer: Option D
Explanation:Since the charge of an electron is 1.6×10−19C, 6.25 × 10 to the power 18 electrons taken together constitute (6.25 × 10 to the power 18 × 1.6 × 10−19 C) or 1 coulomb of charge.
What is meant by an electric circuit?
A continuous and closed path of an electric current is called an electric circuit.
What is fuse wire and how does it work?
The fuse is placed in series with the device. It consists of a piece of wire made of a metal or an alloy of appropriate melting point, for example aluminium, copper, iron, lead etc. If a current larger than the specified value flows through the circuit, the temperature of the fuse wire increases. This melts the fuse wire and breaks the circuit.
What do you know about a resistor?
A conductor having some appreciable resistance is called a resistor.
What is variable resistance or rheostat?
A component used to regulate current without changing the voltage source is called variable resistance.
Updated CBSE NCERT Solutions
We use to updated NCERT Solutions according to latest updates provide by CBSE or feedback received by the users. We modify the contents as per need of students also. Most of the contents are available in Hindi and English Medium. Feel free to contact us regarding any educational help.
