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By Swati Singh
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Updated on 20 Feb 2026, 16:12 IST
The CBSE Class 10 Science MCQs for Chapter 15: Our Environment are available for free download in PDF format. Along with the questions, we have also included the answers to help students understand the correct solutions. Practicing these MCQs will help students familiarize themselves with the types of questions that might appear in the board exam from this chapter. These MCQs are based on the updated CBSE Class 10 Science Syllabus and cover all the essential topics. Regular practice will enhance students' confidence and improve their performance in the exams.
Before attempting these MCQs, students should review the following key concepts from the NCERT Class 10 Science Textbook to ensure they are well-prepared:
Additionally, students can explore more CBSE Class 10 Science MCQs from other chapters to further strengthen their exam preparation
1. The SI unit of electric current is:
a) Volt
b) Ampere
c) Ohm
d) Coulomb
Answer: b) Ampere
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Explanation: The unit of electric current is ampere (A).
2. The potential difference between two points in an electric circuit is 2V. The work done in moving 10C of charge between these two points is:
a) 10 J
b) 2 J
c) 20 J
d) 5 J
Answer: c) 20 J
Explanation: Work done = Voltage × Charge = 2V × 10C = 20 J.
3. Which of the following is a good conductor of electricity?
a) Wood
b) Rubber
c) Copper
d) Plastic
Answer: c) Copper
Explanation: Copper is an excellent conductor of electricity.
4. The resistance of a conductor depends on:
a) Temperature and material
b) Voltage and current
c) Voltage only
d) Material only
Answer: a) Temperature and material
Explanation: Resistance depends on the material, length, and cross-sectional area of the conductor, and also on temperature.
5. Ohm’s law states that:
a) V = IR
b) V = I/R
c) I = V/R
d) R = VI
Answer: a) V = IR
Explanation: Ohm's law states that the potential difference (V) across a conductor is directly proportional to the current (I), with the resistance (R) being the constant of proportionality.
6. The electrical power consumed by an appliance is given by:
a) P = V × I
b) P = I² × R
c) P = V² / R
d) All of the above
Answer: d) All of the above
Explanation: The power can be calculated using all these formulas based on the given quantities.
7. The SI unit of resistance is:
a) Ampere
b) Ohm
c) Watt
d) Volt
Answer: b) Ohm
Explanation: The unit of resistance is Ohm (Ω).
8. Which of the following materials is a poor conductor of electricity?
a) Copper
b) Aluminum
c) Silver
d) Rubber
Answer: d) Rubber
Explanation: Rubber is an insulator and a poor conductor of electricity.
9. If the resistance of a conductor is doubled, then the current will:
a) Remain the same
b) Become half
c) Double
d) Become zero
Answer: b) Become half
Explanation: According to Ohm's law, if resistance increases, the current decreases for the same voltage.
10. The total resistance in a series circuit is:
a) Sum of individual resistances
b) Product of individual resistances
c) Difference of individual resistances
d) Inversely proportional to the sum of reciprocals
Answer: a) Sum of individual resistances
Explanation: In a series circuit, the total resistance is the sum of the individual resistances.
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Electricity is the flow of electric charge, primarily through conductors like wires. This flow of charges is called electric current, which powers devices, machines, and appliances.
Chapter 12 covers the following key topics:
Electric current and its units
Potential difference and its relation to electric current
Ohm’s law and its application
Resistance and factors affecting it
Electric power and energy
Series and parallel combinations of resistors
Heating effect of current
Electric current is the rate at which electric charges flow through a conductor. It is measured in amperes (A) using an ammeter. One ampere is the current flowing when one coulomb of charge passes through a point in one second.
Ohm’s law states that the current flowing through a conductor is directly proportional to the potential difference (voltage) across it, provided the temperature remains constant. Mathematically, it is expressed as:
V = I × R, where V is the voltage (in volts), I is the current (in amperes), and R is the resistance (in ohms).
The unit of resistance is ohm (Ω). One ohm is the resistance when one volt of potential difference causes a current of one ampere to flow through a conductor.
Series Circuit: In a series circuit, all components are connected end-to-end, and the same current flows through each component. The total resistance is the sum of individual resistances.
Parallel Circuit: In a parallel circuit, the components are connected across the same two points, so each component gets the same potential difference. The total resistance is less than the smallest individual resistance.
Resistance opposes the flow of electric current. The higher the resistance, the less current will flow for a given voltage. Resistance depends on factors like the material of the conductor, its length, cross-sectional area, and temperature.