Explanation

• A car's steering system uses a wheel and axle.
• It is mechanism to transmit the rotational motion of the steering wheel to the wheels of the car, allowing the vehicle to turn.

Explanation

• Friction forces between the air and a moving object cause resistance.
• Which slows down the object and converts some of its kinetic energy into heat.

Explanation

An inclined plane is a slanting surface connecting a lower level to a higher level.

It is a simple machine that helps to lift or move loads to a higher position, and is commonly used in:

• Ramps
• Staircases
• Slides
• Ski lifts
• Hilly roads

Explanation

• Distance = 12 cm = 120 mm (since 1 cm = 10 mm)
• Time = 60 s
• Average speed = Distance / Time = 120 mm / 60 s = 2 mm/s = 2 mms¹
• So, the snail's average speed is indeed 2 mms¹.

Explanation

• Radio waves have a much higher frequency than sound waves.
• Sound waves have frequencies in the range of 20 Hz to 20,000 Hz, while radio waves have frequencies in the range of thousands to billions of Hz (kilohertz to gigahertz).
• Radio waves are a type of electromagnetic wave, and their frequency is typically measured in kilohertz (kHz), megahertz (MHz), or gigahertz (GHz).
• For example, FM radio broadcasts typically use frequencies between 88 MHz and 108 MHz, while AM radio broadcasts use frequencies between 535 kHz and 1605 kHz.

Explanation

• The Second is the SI unit of time.
• It is defined as 9,192,631,770 periods of a caesium-133 atom's radiation.

Explanation

Boyle’s Law describes the inverse relationship between the pressure (P) and volume (V) of a given mass of gas at constant temperature (isothermal conditions):

P ∝ 1/V or PV = constant

Key Points:

• Conditions: Fixed mass and temperature (no chemical reactions).
• Example: Compressing a syringe (volume ↓ → pressure ↑).

Explanation

The time period T of a simple pendulum is given by: T = 2π√L/g

It depends on length (L) and acceleration due to gravity (g), but is independent of mass.

Explanation

In oscillatory motion, such as that of an oscillating charge, velocity varies continuously.

It is zero at extreme positions and maximum at the mean position, so it is changing.

Explanation

A semiconductor diode has 2 terminals: anode (positive) and cathode (negative).

It allows current to flow in one direction only, functioning as a rectifier.