Physics - Study Mode

[#436] Which color deviates least when passing through a Prism
Correct Answer

(D) Red

Explanation

Solution: Red light suffers the least amount of deviation and violet the most. When a white light is made to pass through a prism, formation of a spectrum of seven colors occurs showing white light is a combination of seven separate colors.

[#437] Which color deviates highest when passing through a Prism
Correct Answer

(C) Violet

Explanation

Solution: The wavelength and frequency of these deviated colours is different, they deviate differently at different angles due to the velocity difference of the prism. The colour red therefore deviates the least since it has maximum wavelength and colour violet deviates the most since it has the least wavelength.

[#438] A pond of water appears less deep due to
Correct Answer

(C) Refraction

Explanation

Solution: The apparent depth will look less that its real depth due to the refraction of light. First of all, imagine an object at the bottom of the pond, emitting three beams of light: one straight to the centre of your eye, one above your eye, and one below. Now, as light travels faster in air than it does in water, it will accelerate as it breaks the surface, at which point it bends away from the ‘normal’ - the imaginary line perpendicular to the surface. So back to those three beams, the one coming straight at your eye, and as such perfectly vertical, will not bend one way or another as it leaves the water. The other two beams, however, will bend further away from that middle beam, creating a ‘triangle’ with a larger base, if you were to draw a diagram. These new trajectories, if traced backwards, and ignoring a reverse bending in water, will all meet at a new point, higher than the actual point of origin.

[#439] If the distance between Sun and Earth becomes double, then the gravitational force on Earth will be
Correct Answer

(D) One Fourth

Explanation

Solution: If the distance is doubled, the force of gravity is one-fourth as strong as before.

[#440] The large collection of stars, dust and gas held together by gravitational attraction between components is known as
Correct Answer

(C) Galaxy

Explanation

Solution: The term galaxy refers to a large collection of stars, dust, and gas clouds which are held together by gravitational attraction.The smallest galaxies may contain only a few hundred thousand stars, while the largest galaxies have thousands of billions of stars. The Milky Way galaxy contains our solar system.