Physics - Geometrical Optics Question with Solution | TestHub
Match the column.
Column I
(A)
Block of mass 1 kg is kept inside a smooth fixed hemisphere as shown. The block is projected horizontal with speed of 1 m/s. The velocity of block.
(B) A ball falling from a great height in presence of air drag. Its velocity.
(C)
Switch is closed at t = 0. The energy stored in inductor.
(D) A beam parallel to the principal axis is falling on a converging lens. As one moves from lens to on other side, the intensity of light.
Column II
(P) Periodically changes.
(Q) Decreases exponentially with time.
(R) Increases and then becomes constant.
(S) Increases and then decreases.
(T) Decreases and then increases.
Options:
Answer:
Solution:
(A) The block oscillates inside the smooth hemisphere, so its velocity changes periodically, and in each swing its magnitude decreases and then increases: A-P, T. (B) With air drag the ball's velocity increases and then becomes constant at the terminal velocity: B-R. (C) After the switch is closed the inductor current rises to its steady value, so the stored energy increases and then becomes constant: C-R. (D) Beyond the lens the beam converges to the focus and then diverges, so the intensity increases and then decreases: D-S. Hence option (A).
