WB TET · Mathematics and Science (Paper II)
Reflection, refraction, heat transfer and sound waves.
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Q1 · Light, Heat and Sound · EASY
A student places a plane mirror on a table and shines a torch at it such that the light ray makes an angle of 30 degrees with the mirror surface. What is the angle of reflection measured from the normal to the mirror?
Q2 · Light, Heat and Sound · EASY
A metal spoon is heated at one end. After some time, the other end also becomes hot. Which mode of heat transfer is primarily responsible for this?
Q3 · Light, Heat and Sound · MEDIUM
A sound wave travels through air at 340 m/s. If the frequency of the sound is 680 Hz, what is the wavelength of the sound wave?
Q4 · Light, Heat and Sound · MEDIUM
A ray of light passes from air into a glass block. The refractive index of glass is 1.5. If the speed of light in air is 3 × 10^8 m/s, what is the speed of light in the glass block?
Q5 · Light, Heat and Sound · EASY
Which of the following phenomena is responsible for the formation of a rainbow?