📘 Class 10 – Physics

Q. Speed of light in vacuum?

Ans: 3 × 10^8 m/s

Q. Unit of force?

Ans: Newton (N)

Q. What is Newton’s First Law?

Ans: A body remains at rest or in uniform motion unless acted upon by an external force.

Q. What is Ohm’s law?

Ans: Voltage V = IR, where I is current and R is resistance.

Q. Unit of electric current?

Ans: Ampere (A)

Q. Formula for work done?

Ans: W = F × d (Force × displacement)

Q. Frequency of standard AC in India?

Ans: 50 Hz

Q. Define density.

Ans: Mass per unit volume (ρ = m/V)

Q. Acceleration due to gravity on Earth?

Ans: 9.8 m/s

Q. Principle of a lever?

Ans: Law of moments: F1 × L1 = F2 × L2