Explanation

Core: Accounts for about 15% of Earth's total volume, composed mainly of iron and nickel alloys.

Mantle: Occupies 84% of Earth's volume.

Crust: Makes up 1% of Earth's volume.

Explanation

In a compound microscope, the final image is typically virtual and inverted.

The objective lens forms a real, inverted image, which is then magnified by the eyepiece, resulting in a virtual and inverted image seen by the observer.

Explanation

When two resistances of 2Ω each are connected in parallel:

1/R = 1/R1 + 1/R2

= 1/2 + 1/2

= 2/2

= 1

R = 1Ω

Explanation

A stadiometer is specifically designed to measure a person's height accurately.

It typically consists of a vertical ruler with a movable headpiece for precise measurement.

Explanation

Medicine in a teaspoon is measured in milliliters (mL) as it is a small liquid quantity.

A standard teaspoon holds approximately 5 mL of liquid.

Explanation

Enthalpy is a form of energy, so its SI unit is Joule (J).

1 calorie = 4.184 joules.

But Joule is the standard unit in thermodynamics.

Explanation

Balanced forces are equal in magnitude but act in opposite directions, resulting in no net force (Newton's First Law).

The individual forces have opposite directions, even though their effects cancel out.

Explanation

Laser light consists of a single wavelength, making it monochromatic (one color).

It is also coherent and highly directional, unlike ordinary light sources.

Explanation

When an object is placed between F (focus) and 2F in a convex lens, the image is formed beyond 2F.

The image is real, inverted, and magnified because light rays converge beyond twice the focal length.

Explanation

The strength or intensity of a force is measured by its magnitude, which represents its size.

Force is a vector quantity, meaning it has both magnitude and direction.