Electric Current and its Effects

12 solved questions from Class 7 Science, each with the full working. Tap any question to see the step-by-step solution.

1 What is the fundamental scientific concept introduced in the chapter 'Electric Current and its Effects'? medium MCQ Key Concept & Definition
2 Which of the following is an important application or observation related to 'Electric Current and its Effects'? easy MCQ Practical Application
3 What primary question does the chapter 'Electric Current and its Effects' aim to answer? medium MCQ Core Scientific Inquiry
4 Why is the study of 'Electric Current and its Effects' essential for students in class-7? hard MCQ Importance & Significance
5 Which key practice is recommended while studying topics in 'Electric Current and its Effects'? medium MCQ Scientific Method
6 What is the primary topic or theoretical principle explored in 'Electric Current and its Effects' (Class 7 SCIENCE)? medium MCQ Chapter Core Principle
7 Which key mechanism or analytical rule is highlighted in 'Electric Current and its Effects'? medium MCQ Key Analytical Mechanism
8 Which of the following statements is true about electric current? easy MCQ 1 mark Definition of electric current.
9 A 2‑metre long copper wire has a resistance of 0.04 Ω at 20 °C. If its length is doubled, what will be the new resistance, assuming the resistivity stays the same? medium 2 marks Resistance proportional to length.
10 A 60 W light bulb is connected to a 120 V supply. Calculate (a) the current drawn by the bulb, and (b) its resistance. easy 2 marks Electric current and Ohm’s law
11 A 1‑m long copper wire has resistivity 1.68×10^-8 Ωm. Its cross‑sectional area is 0.5 mm^2. (i) Find its resistance. (ii) If its length is increased to 1.5 m, what will be the new resistance? medium 3 marks Resistivity and resistance of a wire
12 Which of the following statements correctly explains why the resistance of a metal conductor increases when it is heated? medium MCQ 1 mark Temperature effect on metal conductors