Science - Odisha BSE Madhyama: Physical and Life Science
In the Odisha BSE Madhyama Science paper, questions come from two strands: Physical Science, which covers physics and chemistry, and Life Science, which covers biology. Expect short definitions, one-line reasoning, labelled diagrams, balanced equations, and small numericals on motion, electricity, light and heat. Life Science leans on processes - nutrition, respiration, transport, excretion, control and coordination, reproduction, heredity and environment - and often asks you to compare two processes or explain a cause-and-effect chain.
Core rules to apply
- Every numerical answer needs the formula written first, substitution shown, and a unit on the final line.
- Balance every chemical equation; add state symbols only when the question asks for them.
- Diagrams earn marks for labels, not neatness - use straight label lines and the exact textbook name for each part.
- In 'give reasons' questions, state the principle in one sentence, then apply it in the next.
- Definitions should be one sentence containing the key term and its distinguishing feature - for example, refraction is the change in direction of light when it passes from one transparent medium into another because its speed changes.
Worked example
A convex lens of focal length 10 cm forms an image of an object placed 15 cm in front of it. Find the image distance and magnification.
Reasoning: write the lens formula, 1/v − 1/u = 1/f, then apply the sign convention: u = −15 cm and f = +10 cm. So 1/v = 1/f + 1/u = 1/10 − 1/15 = (3 − 2)/30 = 1/30, giving v = +30 cm: the image is real, inverted and 30 cm beyond the lens on the far side. Magnification m = v/u = 30/(−15) = −2, so the image is twice the object's height and inverted.
Marks-losing traps
- Dropping the minus sign on u, then adjusting the answer to fit.
- Writing a word equation where a balanced symbol equation is demanded.
- Confusing mitosis with meiosis, or artery with vein, in 'distinguish' questions.
- Leaving a diagram unlabelled - an unlabelled diagram usually scores nothing.