The velocity of a body changes from 2 m/s to 10 m/s in 4 s. Distance covered in this time is (assuming constant acceleration) MCQ with Answer and Explanation

Explanation:
3 half-lives (9/3=3) => (1/2)³ = 1/8.

Explanation:
Total internal reflection requires: (1) denser→rarer medium, (2) incidence angle > critical angle. Memory aid: 'TIR: n₁>n₂ AND i>θ_c'. Optics condition frequently tested in competitive exams.

Explanation:
For ideal transformer, V_s/V_p = N_s/N_p. So N_s/N_p = 2200/220 = 10. So secondary turns 10 times primary. Ratio 10:1. Step-up increases voltage.