Explanation

 A calorie is a unit of energy, specifically used to measure heat energy.

1 calorie is the amount of heat required to raise the temperature of 1 gram of water by 1°C.

In dietary terms, we use kilocalories (kcal) — where 1 kcal = 1000 calories — but it still measures energy, not diet or food itself

Explanation

• Weight (W) = 30 N

• Acceleration due to gravity (g) = 10 m/s²

• We are asked to find the mass (m).

Formula:

$$\text{Weight}=\text{Mass}\times \text{Gravity}$$$$W=m\times g$$ $$30 = m times 10 Rightarrow m = frac{30}{10} = 3 text{ kg}$$

Explanation

James Simpson, a Scottish doctor, is credited with discovering the anesthetic properties of chloroform in 1847

Explanation

 The abbreviation EMF stands for electromotive force,

It is the electrical potential that drives the flow of electric charge in a circuit

 It's also sometimes referred to as voltage. 

Explanation

The primary chemical composition of marble is Calcite. 

Marble is primarily composed of calcium carbonate (CaCO3), which is the mineral calcite. 

Explanation

 Fluoride is a trace mineral that plays a crucial role in maintaining strong and healthy teeth.

It helps strengthen tooth enamel, the outer layer of the tooth, making it more resistant to acid attacks that can lead to cavities. 

Explanation

 A moderate deficiency of zinc is known to cause loss of appetite and poor growth

According to a study published in the Journal of the National Institutes of Health (NIH).

Zinc is essential for proper growth and development

Explanation

Three Primary Colors : Red, Yellow, Blue.

Three Secondary Colors : Orange, Green, Violet.

Six Tertiary Colors : Red-Orange, Yellow-Orange, Yellow-Green, Blue-Green, Blue-Violet, Red-Violet,

which are formed by mixing a primary with a secondary.

Explanation

Antimony sulphide, sulphur, potassium chlorate are the chemicals present in match stick.

The head of safety matches is made of an oxidizing agent.

Such as potassium chlorate, mixed with sulfur, fillers, and glass powder.

Explanation

Convex lenses converge light rays and are used in reading glasses to magnify close-up text.

A short focal length provides greater magnification, making it ideal for reading.