Explanation

Steel is the most elastic material

Because it returns to its original shape more effectively after being deformed than the other materials listed.

Explanation

The sun rises in the East and sets in the West.

which means that the Earth is rotating from West to East. 

Earth revolves in orbit around the Sun in 365 days, 6 hours, 9 minutes.

with reference to the stars, at a speed ranging from 29.29 to 30.29 km/s.

The 6 hours, 9 minutes add up to about an extra day every fourth year,

which is designated a leap year, with the extra day added as February 29th.

Explanation

Sputnik-2, launched by the Soviet Union on 3rd November 1957, weighed approximately 508 kilograms.

It carried Laika, the first living creature (a dog) to orbit Earth.

Explanation

Biomass energy comes from plants, which get their energy through photosynthesis using sunlight.

So, the Sun is the original source of energy for all biomass.

Explanation

A force is a vector quantity.

Force is requires both magnitude (strength) and direction to be fully described.

Explanation

In the double-touch method, opposite poles (north and south) of two magnets are rubbed on the material in opposite directions to magnetize it effectively.

This helps align more magnetic domains inside the material.

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

A washing machine uses an electric motor to produce mechanical motion for spinning and agitating clothes.

This is a clear example of converting electrical energy into mechanical energy.

Explanation

A screwdriver works on the wheel and axle principle, where the handle acts as a wheel, and the shaft acts as an axle to apply torque.

This mechanism helps in tightening or loosening screws efficiently.

Explanation

The distance traveled by a free-falling object can be calculated using the equation:

s = (1/2)gt²

where s is the distance, g is the acceleration due to gravity (approximately 9.8 m/s²), and t is the time.

Given t = 5 seconds:

s = (1/2) × 9.8 × 5²

s = (1/2) × 9.8 × 25

s = 122.5 m