General Science Class 10

In the normal human eye, the image is formed :

1. In from of the retina
2. On the retina
3. Behind the retina
4. In between lens and retina

When a light ray enters from a denser medium to a rare medium, it bends :

1. Perpendicular to normal
2. Parallel to normal
3. Toward normal
4. Away from normal

In a compound microscope, as compared to an objective, the eyepiece lens has a focal length :

1. Zero
2. Small
3. Negative
4. Large

When the angle of refraction is 90° and the refractive index for water is 1. 33, the critical angle is :

1. 48.8°
2. 50.0°
3. 49.1°
4. 51.0°

To view dim stars, we use :

1. Compound microscope
2. Endoscope
3. Telescope
4. Simple microscope

The human eye acts like a :

1. Camera
2. Telescope
3. Projector
4. Microscope

A magnifying glass forms an enlarged :

1. Real and upright image
2. Virtual and upright image
3. Real and inverted
4. Virtual and inverted image

The entire light is reflected into the same denser medium, which is called total?

1. External reflection
2. External refraction
3. Internal reflection
4. Internal refraction

In the optic fiber, the core is made of glass or plastic of relatively :

1. Zero refractive index
2. Low refractive index
3. High refractive index
4. No refractive index

A magnifying glass is also called :

1. Endoscope
2. Simple microscope
3. Compound microscope
4. Telescope