Submarine | MCQs

Explanation

• A Periscope is an optical instrument used to observe objects that are not in direct line of sight.
• Such as monitoring the surface of the water from a submarine.

Explanation

Submarines operate based on Archimedes' principle.

It allows them to control buoyancy and submerge or surface by adjusting their density relative to the surrounding water.

Explanation

Explanation

To find the minimum external force needed to crack the windows, we can use the formula:

Force (F) = Pressure (P) × Area (A)

Given:

P = 660 kPa = 660,000 Pa (converting kPa to Pa)

Diameter (d) = 0.30 m

Radius (r) = d/2 = 0.15 m

Area (A) = πr² = π(0.15)² ≈ 0.0707 m²

Now, calculate the force:

F = P × A ≈ 660,000 Pa × 0.0707 m² ≈ 46,662 N ≈ 47,000 N

Explanation

The Agosta-90B class submarines were acquired by the Pakistan Navy from France.

It was commissioned on 6 September 1999

Inducted into the PN Fleet on 21 December 1999.

It is an improved version of the sea-proven Agosta 70

Three Agosta 90Bs were ordered in 1994,

It was first constructed and assembled in France,

The second and third ones were assembled in Pakistan.

Explanation

Periscopes allow a submarine, when submerged at a relatively shallow depth, to search visually for nearby targets and threats on the surface of the water and in the air.

When not in use, a submarine's periscope retracts into the hull.

Explanation

Pakistan Navy has only two submarines on active duty.

Three of the five Agosta class submarines it has are either being upgraded or have defects