General Science Class 7

The band of seven colours is called:

1. Prism
2. Rainbow
3. Lightwave
4. Spectrum

Rainbow is the best example of:

1. Refraction of light
2. Dispersion of light
3. Spectrum of white light
4. Reflection of light

The colour of an opaque or non-luminous object is the colour of light it:

1. Absorbs
2. Reflects
3. Transmits
4. Refracts

When an object reflects the entire component colours of light, it appears:

1. White
2. Black
3. Green
4. Dark

If an object absorbs all seven colours of light, it appears in ____ colour.

1. White
2. Black
3. Dark
4. Green

When sound wave travels from one place to another, what is transported?

1. Matter
2. Momentum
3. Energy
4. Velocity

Sound waves travel in solvents in the form of:

1. Transverse Waves
2. Longitudinal Waves
3. Electromagnetic Waves
4. Mechanical Waves

In a transverse wave, the ___ is the distance b/w its two adjacent crests or troughs?

1. Wavelength
2. Frequency
3. Amplitude
4. Velocity

Wavelength symbol “λ” is termed as:

1. Delta
2. Gamma
3. Omega
4. Lambda

Decibel (dB) is the unit of measurement of:

1. Amplitude
2. Wavelength
3. Pitch
4. None