Physics Quiz 2024-2025

Energy conversions involving a generator is ________.

• chemical energy to electrical energy

• mechanical energy to chemical energy

• electrical energy to mechanical energy

• mechanical energy to electrical energy

The correct order for simple motor to operate?

• I,II,III,IV,V

• II,IV,I,III,V

• IV,V,III,II,I

• V,IV,III,II,I

Transformation takes place in a ceiling fan of electric motor?

• Electrical energy into mechanical energy

• Electrical energy into chemical energy

• Mechanical energy into electrical energy

• Mechanical energy into chemical energy

How can a generator's electromotive force be increased?

• by rotating it faster

• by decreasing the length of the conductor

• by using a small magnet

• by decreasing the number of turns in the coils

Type of lens is used in microscopes and telescopes to enlarge the image of the object?

• concave lens

• both concave and convex lens

• flat lenses

• convex lens

Calculate the wavelength of an electromagnetic wavelength of an electromagnetic wave with a frequency of 12 trillion Hz (1.2x1013Hz) and determine its category. (Use v=3 x 108 m/s)

• 2.5 x10-5 m, infrared

• 2.5 x10-2 m, microwave

• 2.5 x10-10 m, X-ray

• 2.5 x10-8 m, ultraviolet ray

Some of the components of white light are blue (b), green (g), red (r), and yellow (y) light. How will you arrange them in an increasing order of wavelengths?

• b, g, y, r

• g, y, b, r

• r, g,y, b

• r, y, g, b

An electromagnetic wave is made up of the perpendicularly vibrating magnetic and electric fields. These fields also move in a direction opposite to the wave's direction. What kind of wave is an electromagnetic wave according to the properties listed?

• gravitational

• longitudinal

• mechanical

• transverse

Violet light is diffracted the most as we see in the prism experiment. But why do we see a blue sky rather than violet sky?

• We need special glasses to see violet light.

• Dust particles and clouds absorb violet light

• Water vapor in the atmosphere absorbs violet light

• Our eyes are more sensitive to blue than violet light.

Which two colors of light lie at the beginning and end of the visible spectrum?

• red and violet

• red and yellow

• yellow and violet

• yellow and green