Explanation

Fraction given to sister = 1/4

Fraction given to brothers = 2/3

Total fraction distributed = 1/4 + 2/3

= (3+8)/12

= 11/12

Last verified on 13-03-2026

Explanation

Unlike signs means: one integer is positive (+) and the other is negative (−).

Rule: A positive × a negative = negative

Additional information:

Like signs means: both integers are positive (+) or both are negative (−).

Last verified on 13-03-2026

Explanation

LCM of 12, 16, 24:

12 = 2² × 3

16 = 2⁴

24 = 2³ × 3

LCM = 2⁴ × 3 = 48

Last verified on 13-03-2026

Explanation

A number is divisible by 9 if sum of its digits is divisible by 9.

7893 → 7+8+9+3 = 27, which is divisible by 9.

Last verified on 13-03-2026

Explanation

The upper-class limit is the higher value of the class interval.

So, for (10-50), it's 50.

Last verified on 13-03-2026

Explanation

• Law of Inertia = Newton’s First Law of Motion.
• States: “An object at rest stays at rest, and an object in motion continues in the same direction and speed unless acted upon by an unbalanced force.”
• Explains why seat belts are important in cars.
• Applies to all objects on Earth and in space.

Last verified on 13-03-2026

Explanation

• The word ‘Scientia’ is derived from the Latin word Scientia which means ‘knowledge’.
• Science involves observation, experimentation, and analysis.
• The scientific method includes Hypothesis → Experiment → Observation → Conclusion.

Last verified on 13-03-2026

Explanation

• The Sun is a star.
• There are lots of stars, but the Sun is the closest one to Earth.
• It is the center of our solar system.
• The Sun is a hot ball of glowing gases.
• The sun is composed of layers made up almost entirely of hydrogen and helium.

Last verified on 13-03-2026

Explanation

• Sound waves are mechanical waves that require a medium (air, water, or solid) to travel.
• They transport energy, not matter.
• Particles of the medium vibrate around their mean position but do not move along with the wave.
• Examples: Speaking, music, and alarms transfer energy through sound waves.

Last verified on 13-03-2026

Explanation

• Refraction: Bending of light when it passes from one medium to another.
• A prism bends light at different angles depending on wavelength.
• This separation of colors is called dispersion, forming a spectrum.
• Visible spectrum colors: Red, Orange, Yellow, Green, Blue, Indigo, Violet (ROYGBIV).

Last verified on 13-03-2026