Class 10 — Physics

Q1. In SHM, the restoring force is directed towards:

✔ Correct: B — Restoring force always acts towards the mean (equilibrium) position.

Q2. The time period of a pendulum depends on its:

✔ Correct: C — T = 2 pi sqrt(l/g); only length and g matter (for small amplitude).

Q3. If the length of a pendulum is doubled, its time period becomes:

✔ Correct: C — T is proportional to sqrt(l), so doubling l multiplies T by sqrt(2).

Q4. The number of oscillations per second is called:

✔ Correct: B — Frequency is the number of complete oscillations in one second.

Q5. A longitudinal wave consists of:

✔ Correct: B — Sound waves travel as compressions and rarefactions.

Q6. The distance between two consecutive crests is:

✔ Correct: C — Wavelength is the distance between two consecutive crests or troughs.

Q7. When waves enter shallow water from deep water, their speed:

✔ Correct: B — In shallow water waves slow down; this is refraction of water waves.

Q8. Damping in oscillations is caused by:

✔ Correct: B — Friction and air resistance reduce amplitude gradually - this is damping.

Q9. Which wave can travel through vacuum?

✔ Correct: C — Electromagnetic waves like light need no material medium.

Q10. A spring-mass system has T = 2 s. Its frequency is:

✔ Correct: B — f = 1/T = 1/2 = 0.5 Hz.