Explanation

• The unit of pressure is N/m² (Newton per square meter).
• It is also called Pascal (Pa).
• Pressure means force applied per unit area.
• Higher force or smaller area increases pressure.

Last verified on 17-06-2026

Explanation

• Honey has the maximum viscosity.
• Viscosity means resistance to flow.
• Honey flows very slowly due to high internal friction.

Last verified on 17-06-2026

Explanation

Kinetic energy formula = 1/2 × mass × velocity²  

Mass is constant.

If KE doubles, then velocity² must double.  

If velocity² becomes 2 times, velocity becomes √2 times.

So kinetic energy doubles by doubling √2 × velocity.

Last verified on 17-06-2026

Explanation

• Lenz’s law is based on the law of conservation of energy.
• It states that induced current always opposes the change causing it.
• This opposition prevents creation of energy from nothing.
• It ensures energy is neither created nor destroyed.

Last verified on 17-06-2026

Explanation

• The dimension of velocity is [L T⁻¹].
• Velocity is defined as displacement per unit time.
• It shows how fast and in which direction an object moves.
• It is a vector quantity.
• SI unit of velocity is m/s.

Last verified on 17-06-2026

Explanation

• Magnifying power has no unit because it is a ratio.
• It compares image size to object size.
• Since both are lengths, units cancel out.
• It only shows how many times an object is magnified.

Last verified on 17-06-2026

Explanation

• Density is the reciprocal of specific volume.
• Density tells how much mass is in a given volume.
• Specific volume tells how much volume is occupied by unit mass.

Last verified on 16-06-2026

Explanation

• A junction in an electrical circuit is called a node.
• A node is a point where two or more circuit elements meet.
• Current entering a node equals current leaving it (Kirchhoff’s Law).

Last verified on 16-06-2026

Explanation

• Brazing and welding are hot working processes.
• Because they involve the use of heat to join metals.
• In welding, metals are melted and joined together using heat.
• In brazing, a filler metal is melted to join two metal pieces without melting the base metals.

Last verified on 16-06-2026

Explanation

• Fusion of hydrogen nuclei releases the most energy per unit mass.
• In nuclear fusion, light hydrogen nuclei combine to form helium and release huge amounts of energy.
• Fusion converts a small amount of mass into energy according to Einstein’s equation (E = mc²).
• It powers stars, including the Sun.

Last verified on 14-06-2026