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CBSE Class 11 Biology Practical MCQ Test 🔬 | Compound Microscope Parts & Functions |
Test your preparation with this CBSE Class 11 Biology Practical MCQ Exam on the Parts of a Compound Microscope, aligned with NCERT and CBSE...
30 Qs
22 Aug 2026
Free
Biological Classification Quiz : MCQs for NEET & CBSE
Memorizing Chapter 2 doesn't have to be boring. We've transformed the entire NCERT chapter into 60 high-quality MCQs complete with in-depth,...
60 Qs
17 Aug 2026
Free
NCERT Class 10 Science Control and Coordination MCQ Test / Animal Nervous System & Human Brain
Test your knowledge of the human nervous system! (Control and Coordination). Dive into topics ranging from reflex arcs and neurons to the ma...
30 Qs
17 Aug 2026
Free
The Living world & Taxonomic Categories
A rigorous 30-question MCQ test evaluating deep conceptual understanding of the taxonomic hierarchy (Genus to Kingdom) based on NCERT Class...
30 Qs
12 Aug 2026
Practice Questions
A fresh set of questions every visit — build concepts one answer at a time.
Why should immersion oil be removed after use?
Oil left hardens, attracts dust, damages lens coating and can seep into objective. Clean with lens paper and xylene-free...
Ref: NCERT Biology Laboratory Manual, Class XI, Mounting precautions and identification of artifacts.
Parfocal and parcentric properties mean:
Parfocal: minimal refocus needed between objectives. Parcentric: field stays centered. Saves time and prevents collision...
Ref: NCBI Bookshelf, Molecular Biology of the Cell: Oil immersion principle and numerical aperture.
Köhler illumination alignment requires:
Köhler gives uniform illumination, reduces glare, maximizes NA. Steps: focus specimen, close field diaphragm, focus cond...
Ref: Nikon MicroscopyU, Iris diaphragm control: Contrast versus resolution and diffraction effects.
Depth of field decreases with:
DOF ∝ λ / NA². Oil immersion 1.4 NA has DOF ~0.2µm vs 4x 0.1 NA DOF ~50µm. So bacteria at different depths need refocus.
Ref: NCERT Biology Laboratory Manual, Class XI, Precautions for high power and collision avoidance.
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