CBSE Class 9 Science Cell: The Building Block of Life (Class 9 NCERT New) Quiz 5

1. What material did Robert Hooke examine under his self-designed microscope when he discovered cells?

A Onion peel B Thin slice of cork C Pond water D Human cheek cells

2. What did the box-like compartments observed by Robert Hooke remind him of?

A Solar panels B Interlocking bricks C Tiny rooms/cells D Concentric circles

3. Which lens combination is typically found in a standard school laboratory light microscope for magnification?

A Concave lens and convex lens B Objective lens and eyepiece C Two concave lenses D Cylindrical lens and prism

4. What type of microscope uses a beam of electrons instead of light to reveal cell structures at the nanometer scale?

A Compound light microscope B Simple microscope C Electron microscope D Dissecting microscope

5. If a microscope has a 10X eyepiece lens and a 10X objective lens, what is its total magnifying power?

A 20X B 100X C 10X D 1000X

6. How many micrometers (μm) are there in 1 millimeter (mm)?

A 100 μm B 1000 μm C 10,000 μm D 10 μm

7. If the diameter of a microscope's visible field is 5 mm, what is this diameter expressed in micrometers (μm)?

A 500 μm B 5000 μm C 50 μm D 50,000 μm

8. If a visible field of view is 4000 μm wide and 20 onion cells fit perfectly across it in a straight line, what is the estimated size of one cell?

A 20 μm B 200 μm C 400 μm D 80 μm

9. Which basic microscope feature refers to the difference in brightness between different parts of an object?

A Resolution B Magnification C Contrast D Focus

10. Which basic microscope feature serves as a measure of visual clarity?

A Magnification B Contrast C Resolution D Illuminance