Electricity Magnetism Energy and Environment (Class 10)

What this worksheet covers

This is an eighteen-question practice worksheet on electricity, magnetism, energy and environment for Class 10, written to the pattern of the SOF National Science Olympiad (NSO). It carries 24 marks and is designed to be attempted in 45 minutes, split across three sections — Scientific Reasoning, Applying What You Know and Achievers Section. Every question is multiple choice with exactly one correct option, and every one comes with a fully worked solution rather than just an answer key — so a child who gets one wrong can see where the reasoning went astray instead of only learning that it did.

Skills your child practises

• Applied problem-solving on electricity, magnetism, energy and environment at Class 10 level
• Working accurately against a time limit, as the real paper demands
• Scientific Reasoning questions in the olympiad format
• Applying What You Know questions in the olympiad format
• Achievers Section questions in the olympiad format
• Reading worked solutions to find the step that went wrong

How to use it

1. 1There are 18 questions in this worksheet. All questions are compulsory.
2. 2Each question has four options (A), (B), (C) and (D). Exactly one option is correct.
3. 3Questions 1–15 carry 1 mark each. Questions 16–18 (Achievers Section) carry 3 marks each.
4. 4There is no negative marking. Study every circuit diagram and table carefully.

Sample questions from this worksheet

A preview of what's inside Electricity Magnetism Energy and Environment (Class 10) — the PDF has the full set, and every question comes with a worked solution like these.

1. 1. Ohm’s law is expressed as _______.

   • AV = {I/R}
   • BV = IRcorrect
   • CI = VR
   • DR = VI
   Solution: At constant temperature the current through a conductor is proportional to the potential difference across it, which gives V = IR.

2. 2. Two resistors of 6 Ω each are connected in parallel. Their combined resistance is _______.

   • A{1/3} Ω
   • B6 Ω
   • C12 Ω
   • D3 Ωcorrect
   Solution: For a parallel pair, {1/R} = {1/6} + {1/6} = {2/6}, so R = 3 Ω. Identical resistors in parallel always give half the individual resistance.

3. 3. Assertion (A): A bird perched on a single high-voltage wire is not harmed.Reason (R): No appreciable current flows through the bird because there is almost no potential difference between its two feet.

   • ABoth A and R are true and R is the correct explanation of Acorrect
   • BBoth A and R are true but R is not the correct explanation of A
   • CA is true but R is false
   • DA is false but R is true
   Solution: Current needs a potential difference to drive it. The bird’s feet touch the same wire a few centimetres apart, so the potential difference between them is tiny and almost no current passes through its body. Both statements are true and the second is exactly why the bird is safe — touching a second wire or the ground would be fatal.