General Science Class 10

The electromagnetic rays used in radiotherapy to destroy cancer cells are :

1. Infrared rays
2. X-rays
3. Visible rays
4. Ultraviolet rays

The Velocity of light in a diamond is (whereas the refractive index of a diamond with respect to vacuum is 2.5)?

1. 5x10^8m/s
2. 2.5x10^8m/s
3. 1.2x10^10m/s
4. 1.2x10^8m/s

The group containing only electromagnetic waves is :

1. Light waves, Radio waves, Microwaves
2. Light waves, Radio waves, Sound waves
3. Light waves, Sound waves, Microwaves
4. Radio waves, Sound waves, Microwaves

The list that shows electromagnetic waves in order of an increasing wavelength is :

1. Microwaves, X-rays, Gamma-rays
2. Microwaves, Gamma-rays, X-rays
3. X-rays, gamma-rays, Microwaves
4. Gamma-rays, X-rays, Microwaves

The type of electromagnetic wave used in security scanners at night is :

1. Microwaves
2. Infra-red
3. Radio waves
4. X-ray

A narrow beam of white light passes from air into the glass and is refracted. The wave characteristic remains unchanged in its :

1. Direction
2. Speed
3. Frequency
4. Wavelength

The type of waves that are used in the television remote controllers?

1. Radio waves
2. Infra-red waves
3. Ultra-violet waves
4. Visible light

The color that is least deviated by a prism :

1. Violet ray
2. Red ray
3. Green ray
4. Yellow ray

The optical phenomenon in which the splitting of white light into seven distinct colors occur is called?

1. Refraction
2. Dispersion
3. Reflection
4. Diffraction

In a concave mirror, the image size depends upon :

1. Size of the object
2. Area covered by the object
3. Position of the object
4. The shape of the object