Explanation

In uniform velocity, distance increases linearly with time.

Hence, the distance–time graph is a straight line with constant slope.

Explanation

Newton's first law of motion is also called as Law of inertia.

• Inertia is the ability of a body by virtue of which it opposes a change.
  
• According to Newton’s first law of motion, an object will remain at rest or in uniform motion in a straight line
• unless acted upon by an external force.
  • The inertia of rest: When a body is in rest, it will remain at rest until we apply an external force to move it. This property is called inertia of rest.
  • The inertia of motion: When a body is in a uniform motion, it will remain in motion until we apply an external force to stop it. This property is called inertia of motion.

Explanation

The moon’s gravitational pull attracts ocean water, causing high and low tides.

This effect is strongest on the side of Earth facing the moon.

Explanation

Motion along a straight line occurs in one dimension only.

Examples include a car moving on a straight road or a free-falling object.

Explanation

Explanation

Velocity SI units: meters per second (m/s or m·s⁻¹).

This unit is derived from the SI units for displacement (meter) and time (second),

Velocity is defined as the rate of change of displacement over time (displacement/time). 

Explanation

Explanation

Primary pollutants are emitted directly into the air from sources like vehicles and industries.

Examples include carbon monoxide (CO), sulfur dioxide (SO₂), and nitrogen dioxide (NO₂).

Explanation

pH is calculated as pH = -log[H⁺].

For [H⁺] = 1 × 10⁻⁷ M, pH = 7 → the solution is neutral.

Explanation

Fragrance spreads because its molecules move from a region of high concentration to low concentration in air.

This natural mixing of particles without external force is called diffusion.