Explanation

• Mass and Length are base quantities in SI units.
• Length SI Unit: meter (m)
• Mass SI Unit: kilogram (kg)

Additional information:

Base Quantities in SI System:

• Time (second)
• Electric current (ampere)
• Temperature (kelvin)

Last verified on 16-06-2026

Explanation

• Electric fire alarms work on the principle of expansion of metals due to heat.
• A fire alarm uses a bimetallic strip that bends when heated because different metals expand at different rates.
• This bending completes an electric circuit and activates the alarm.
• It is an example of the thermal expansion principle.

Last verified on 25-06-2026

Explanation

• Omnivores are NOT an abiotic factor; they are a biotic (living) factor.
• Abiotic factors are non-living components of the environment such as soil, temperature, and sunlight.
• Omnivores are organisms that eat both plants and animals.
• Environmental factors are divided into biotic and abiotic components.

Last verified on 25-06-2026

Explanation

• The instrument used to measure temperature is called a thermometer.
• A thermometer shows how hot or cold an object or place is.

Additional information:

• Barometer measures air pressure.
• Hygrometer measures humidity (moisture in air).

Last verified on 16-06-2026

Explanation

• Pneumatics is the study of the mechanical behavior and application of gases, especially compressed air, under pressure.
• It deals with the use of pressurized gases to produce mechanical motion.
• Pneumatic systems are commonly used in machines, tools, and industrial equipment.
• The word comes from the Greek word "pneuma" meaning air or breath.

Last verified on 25-06-2026

Explanation

• Turning red litmus paper blue is NOT a property of acids; it is a property of bases.
• Acids turn blue litmus paper red.
• Acids generally have a sour taste, are often corrosive, and react with some metals to release hydrogen gas.
• Acids produce hydrogen ions (H⁺) in water.

Last verified on 25-06-2026

Explanation

• Phospholipids are not a component of a DNA nucleotide.

Additional information:

A DNA nucleotide consists of three parts:

1. Nitrogenous base → Adenine (A), Thymine (T), Guanine (G), Cytosine (C)
2. Deoxyribose sugar → 5-carbon sugar in DNA
3. Phosphate group (Phosphoric acid) → Forms the backbone of DNA

Last verified on 25-06-2026

Explanation

• Opposite electrostatic charges attract each other.
• Positive (+) and negative (−) charges pull toward each other due to electrostatic force.
• Like charges (positive-positive or negative-negative) repel each other.
• This principle is explained by Coulomb’s Law.

Last verified on 25-06-2026

Explanation

• Lamp is not a form of energy.
• It is a device that produces light.
• Heat, sound, and light are all different forms of energy.
• Energy is the ability to do work or produce change.
• A lamp converts electrical energy into light energy.

Last verified on 16-06-2026

Explanation

• The primary colors of white light are Red, Green, and Blue (RGB).
• White light is produced when these three colors of light combine in equal amounts.
• This is called the additive color model.
• RGB is used in screens, televisions, and digital displays.

Additional information:

The primary colors of Pigment is:

• Red
• Yellow
• Blue

Last verified on 25-06-2026