PH | MCQs

Explanation

Weight is a vector quantity because it has both magnitude (amount of force) and direction (downward, towards the center of the Earth).

Explanation

Mercury is the only elemental metal that remains in a liquid state at room temperature (around 25°C).

It is used in thermometers, barometers, and other scientific instruments due to this unique property.

Four other elements are liquids slightly warmer than room temperature.

They are:

1. Francium
2. Cesium
3. Gallium
4. Rubidium

Explanation

The speed of sound in steel at 20°C is approximately 5100–5200 m/s, with 5130 m/s being a widely accepted value.

Sound travels faster in solids like steel due to their high density and elasticity compared to gases and liquids.

Explanation

Muscle is a type of tissue that contracts to produce movement.

The three main types of muscle tissues are skeletal, smooth, and cardiac.

Explanation

Explanation

Pressure formula is expressed as P = F/A,

• where P is pressure,
• F is force,
• and A is the area by which the force is applied perpendicularly.

Its SI unit of pressure is Pascal (represented as Pa) 

Definition of Pressure:

 Pressure can be defined as the force acting per unit area.

Explanation

The speed of light is much faster than the speed of sound in air.

Light travels 186 thousand miles in 1 second.

While sound takes almost 5 seconds to travel 1 mile.

Explanation

Physiotherapy, is a healthcare profession that focuses on the assessment, diagnosis, and treatment of disorders and injuries that affect the physical function of the body.

Physiotherapists work to restore, maintain, and maximize a patient's strength, function, movement, and overall well-being.

Physiotherapy typically deals with:

• Immobility of joints and muscles
• Injuries or conditions affecting the musculoskeletal system (e.g., back pain, arthritis, sports injuries)
• Neurological conditions (e.g., stroke, spinal cord injury, Parkinson's disease)
• Cardiovascular and respiratory conditions (e.g., heart disease, chronic obstructive pulmonary disease)

Explanation

The element required for solar energy conversion is silicon.

Silicon is the most common semiconductor material: Silicon is used in about 95% of solar cells sold today. 

Silicon is a naturally occurring element: Silicon is the second most abundant element on Earth, after oxygen.

Explanation

The acceleration due to gravity is 9.8 m/s² downward.

This force acts on the ball throughout its motion.

This pulling it back to the ground after it is thrown upwards.