Q291. Choose the passive form of the sentence:
They are painting the fence.

Q292. What is the other name for bijective function?

Q293. The teacher __________ a new lesson every day.

Q294. What is the inclination of a line which is parallel to x-axis?

Q295. We need to ________ the meeting due to unexpected circumstances.

Q296. \(\mathbf{Passage:}\)

Dark matter, although invisible and undetectable directly, plays a crucial role in shaping the universe. It is believed to constitute about 27% of the universe's mass-energy content. The presence of dark matter is inferred through its gravitational effects on visible matter, such as galaxies and galaxy clusters. Understanding the nature of dark matter remains one of the greatest mysteries in astrophysics.

Q.1: How is the presence of dark matter inferred?
Q.2: What fraction of the universe's mass-energy content is believed to be dark matter?

Q297. If perpendicular distance of a line from origin is 4 units and angle which the normal makes with positive x-axis is 45°, then the equation will be \(_{-----------}\).

Q298. Choose a synonym for "serene."

Q299. The group of students ________ excited about the upcoming trip.

Q300. A particle is moving in a straight line and its distance \(d \: cm\) from a fixed point in the line after \(t \: seconds\) is given by \(d = 2t^3 – 12t + 7\). What is the velocity of the particle after \(4 \: seconds\)?