Explanation

• Saturated vapour exists at the saturation temperature corresponding to a given pressure.
• During boiling, liquid water changes into steam at its saturation temperature, provided the pressure remains constant.
• At standard atmospheric pressure, water boils at approximately 100°C, and its saturation pressure is approximately 101.325 kPa.

Last verified on 16-10-2026

Explanation

• The number of spark plugs needed in a diesel engine is zero
• Diesel engines use compression ignition instead of a spark.
• Air is compressed until it is hot enough to ignite the fuel.
• Instead of spark plugs, they use glow plugs to warm the engine when cold

Explanation

• A change of 1 Kelvin (K) is equal in magnitude to a change of 1 degree Celsius (°C).
• Therefore, a rise of 10 K equals a rise of 10°C.
• The numerical values of Kelvin and Celsius differ when expressing an actual temperature, but their temperature intervals are equal.

Last verified on 16-10-2026

Explanation

• Strain is the ratio of the change in length to the original length of a material when a force is applied.
• It measures the relative deformation of a material.
• It has no unit, because it is a ratio of two lengths.

Last verified on 16-10-2026

Explanation

• Cactus is a CAM plant.
• CAM plants minimize photorespiration by concentrating CO₂ around the enzyme Rubisco during photosynthesis.

Last verified on 16-10-2026

Explanation

• Lipids (fats) are generally present in relatively low amounts in most fruits and vegetables.
• Fruits and vegetables mainly provide water, vitamins, minerals, dietary fibre, and carbohydrates.

Last verified on 16-10-2026

Explanation

• Vitamins A, D, E, and K are fat-soluble vitamins, not water-soluble.
• Vitamin B-complex and Vitamin C are water-soluble vitamins.

Additional information:

• Vitamin A: Important for vision and healthy skin.
• Vitamin K: Essential for normal blood clotting.
• Vitamin C: Helps in collagen formation and wound healing.

Last verified on 16-10-2026

Explanation

• Surface tension decreases as temperature increases.
• Higher temperature increases the kinetic energy of liquid molecules, weakening the effect of intermolecular cohesive forces at the surface.
• Surface tension becomes nearly zero at the critical temperature, where the distinction between liquid and gas disappears.
• Water has a surface tension of approximately 72.8 mN/m at 20°C.

Last verified on 16-10-2026

Explanation

• Prunus armeniaca is the scientific name of apricot.
• Apricot is a stone fruit belonging to the family Rosaceae.
• It is a deciduous fruit tree.
• It is commonly cultivated in temperate and cool regions.

Additional information:

• Pear: Pyrus communis
• Plum: Prunus domestica
• Peach: Prunus persica

Last verified on 16-10-2026

Explanation