Explanation

An inclined plane with one end higher is called a ramp, which is a type of simple machine.

It helps reduce the effort needed to lift objects by allowing them to be pushed or rolled upward.

Explanation

To hear a distinct echo, the reflecting surface must be at least 17 meters away from the sound source.

This distance allows the sound to travel to the surface and back (total 34 meters) in 0.1 seconds, the minimum time gap for the human ear to perceive an echo.

Explanation

The Hubble Space Telescope is designed specifically for research and observation in space.

It captures images and data about stars, galaxies, and other celestial bodies to support astronomical research.

Explanation

One day on Venus (one full rotation) takes about 243 Earth days.

Venus takes about 225 Earth days to orbit the Sun, making a day on Venus longer than its year.

So, 1 day on Venus ≈ 1 year on Earth (approximately).

Explanation

Transverse waves in earthquakes are called S-waves (Secondary waves) because they move the ground perpendicular to the wave direction.

P-waves are longitudinal waves, while S-waves are slower and arrive after them.

Explanation

Since P ∝ 1/V, it means P × V = constant.

So, 10 × 25 = P × 20

Solving:

250 = 20P ⇒ P = 12.5 N/m²

Explanation

Magnetic field lines around a straight current-carrying wire are circular, not straight.

They form concentric circles around the wire as per Right-Hand Rule.

Explanation

Venus

Eight planets in the solar system

Explanation

As two atoms come closer, attractive forces (like between electrons and nuclei) try to pull them together.

Simultaneously, repulsive forces (like between electron clouds or nuclei) also increase, balancing the interaction.

Explanation

When air heats up, it becomes lighter and rises, causing lower air pressure in that area.

Cooler air is denser and exerts more pressure, while rising warm air reduces surface pressure.