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SEAM 6 - Quiz 4 (2nd Sem 2025-2026)

Total questions: 70

Worksheet time: 35mins

Name
Class
Date
1.

Centre of gravity G of a ship is defined as:

a)

The point where the total weight force acts vertically downward

b)

The point of maximum buoyancy underwater

c)

The geometric center of the ship's hull

d)

The point where cargo is concentrated

2.

The vertical position of the centre of gravity is expressed in terms of:

a)

Metres above the deck

b)

Metres above the keel (KG)

c)

Metres above the waterline

d)

Metres from the bow

3.

When a weight is shifted vertically upward on a ship, the centre of gravity:

a)

Moves downward

b)

Remains stationary

c)

Moves upward

d)

Moves horizontally only

4.

The shift of centre of gravity when a weight is shifted is calculated using:

a)

GGv=w×dWGG_v=\frac{w\times d}{W}

b)

GGv=Ww×dGG_v=\frac{W}{w\times d}

c)

GGv=dW+wGG_v=\frac{d}{W+w}

d)

GGv=W+wdGG_v=\frac{W+w}{d}

5.

When loading a weight below the ship's centre of gravity, the KG will:

a)

Increase significantly

b)

Decrease

c)

Remain unchanged

d)

Move horizontally

6.

When loading a weight above the ship's centre of gravity, the KG will:

a)

Decrease

b)

Increase

c)

Remain constant

d)

Oscillate

7.

When discharging a weight from above the centre of gravity, the KG will:

a)

Increase

b)

Decrease

c)

Move laterally

d)

Become zero

8.

The centre of buoyancy B is defined as:

a)

The highest point of the underwater hull

b)

The geometric center of the underwater volume

c)

The lowest point of the keel

d)

The intersection of the waterline and centerline

9.

The vertical position of the centre of buoyancy is expressed as:

a)

BG (above gravity)

b)

KB (above keel)

c)

BK (below keel)

d)

GK (from gravity)

10.

The centre of buoyancy moves primarily due to:

a)

Loading and discharging cargo

b)

Changes in ship's displacement and draught

c)

Movement of crew members

d)

Changes in water temperature

11.

For a box-shaped vessel on even keel, KB equals:

a)

Draught

b)

Half the draught

c)

Twice the draught

d)

One-third of the draught

12.

When calculating the effect of multiple weight movements, the preferred method uses:

a)

Individual formulas for each weight

b)

Moments about the keel approach

c)

Simple addition of displacements

d)

Only the heaviest weight

13.

Transverse statical stability refers to:

a)

A ship's ability to resist sideways motion

b)

A ship's ability to return to upright after heeling by an external force

c)

A ship's ability to maintain trim

d)

A ship's resistance to capsizing

14.

The righting lever (GZ) is the:

a)

Perpendicular distance between weight and buoyancy forces when heeled

b)

Distance from keel to center of gravity

c)

Horizontal distance along the waterline

d)

Vertical component of displacement

15.

The righting moment is calculated by:

a)

RM=GZ×DisplacementRM = GZ \times \text{Displacement}

b)

RM=GM×DisplacementRM = GM \times \text{Displacement}

c)

RM=KG×DisplacementRM = KG \times \text{Displacement}

d)

RM=KB×DisplacementRM = KB \times \text{Displacement}

16.

For small angles of heel, the righting lever can be approximated by:

a)

GZ=GM×tan⁡θGZ = GM \times \tan \theta

b)

GZ=GM×sin⁡θGZ = GM \times \sin \theta

c)

GZ=GM×cos⁡θGZ = GM \times \cos \theta

d)

GZ=GM÷sin⁡θGZ = GM \div \sin \theta

17.

The initial transverse metacentre M is defined as:

a)

The center of gravity of the ship

b)

The point of intersection of successive lines of buoyancy action when heeled

c)

The geometric center of the waterplane

d)

The highest point on the deck

18.

The vertical distance from the keel to the initial metacentre is termed:

a)

GB

b)

GM

c)

KM

d)

BM

19.

Metacentric height (GM) is calculated as:

a)

GM=KG−KMGM = KG - KM

b)

GM=KM−KBGM = KM - KB

c)

GM=KM−KGGM = KM - KG

d)

GM=KB+KGGM = KB + KG

20.

A ship with a positive GM will:

a)

Automatically sink

b)

Be in a stable condition

c)

Trim by the stern

d)

Develop a permanent list

21.

According to IMO criteria, the minimum initial metacentric height in normal loaded condition should be:

a)

Exactly 0.10 m

b)

At least 0.15 m

c)

No less than 0.20 m

d)

Not more than 0.30 m

22.

As a ship heels to larger angles, the initial transverse metacentre:

a)

Remains at a fixed position

b)

Moves along with the center of gravity

c)

Moves as the underwater form changes

d)

Disappears from the calculation

23.

The curve of statical stability (GZ curve) represents:

a)

Only the ship's weight distribution

b)

Righting levers at various angles of heel

c)

The ship's forward motion

d)

The waterline change with draught

24.

At zero heel, the righting lever GZ equals:

a)

GM

b)

Zero

c)

KM

d)

KG

25.

A ship is in a STABLE condition when:

a)

It heels and remains at an angle

b)

It returns to upright after being heeled by an external force

c)

The centre of gravity equals the centre of buoyancy

d)

It has zero metacentric height

26.

For a stable condition to exist, the relationship between G, M, and B must be:

a)

G above M

b)

M above G

c)

B above G

d)

G equals M

27.

A ship is in a NEUTRAL condition of stability when:

a)

KM>KGKM > KG with positive GM

b)

KM=KGKM = KG with zero GM

c)

KM<KGKM < KG with negative GM

d)

G is below K

28.

In neutral stability, if a ship is heeled to a small angle and released:

a)

It returns immediately to upright

b)

It settles at an indeterminate angle of heel

c)

It continues to heel over

d)

It oscillates rapidly

29.

An UNSTABLE condition exists when:

a)

M is above G (positive GM)

b)

M is below G (negative GM)

c)

G equals the center of buoyancy

d)

The ship has excessive freeboard

30.

The angle of loll is defined as:

a)

The angle at which the ship capsizes

b)

The angle at which the ship begins to heel

c)

The angle at which a heeling ship with negative GM comes to rest

d)

The angle of maximum stability

31.

At the angle of loll, the righting lever GZ equals:

a)

Maximum value

b)

Zero

c)

A negative value

d)

Infinity

32.

A ship with an angle of loll is considered:

a)

Adequately stable

b)

In an unstable equilibrium with negative GM

c)

Fully seaworthy

d)

Trimmed by the stern

33.

A ship lying at the angle of loll presents a dangerous situation because:

a)

The crew cannot move freely

b)

Cargo is unlikely to shift

c)

Wind or waves could cause it to roll over with momentum

d)

The ship is very slow

34.

The relationship between G, B, and M in a stable condition is:

a)

G is above both B and M

b)

B is above G which is above M

c)

M is above G which is above B

d)

They all occupy the same point

35.

For a ship floating upright, when will negative GM occur?

a)

When KG is less than KB

b)

When KG is greater than KM

c)

When KG equals KB

d)

When KG equals half the draught

36.

The condition that must be satisfied for stable equilibrium is:

a)

G and B on the same vertical line

b)

G directly below M

c)

M directly below G

d)

M directly above G

37.

A ship in neutral stability has:

a)

Positive righting lever at all angles

b)

No righting lever at small angles but develops one at larger angles

c)

Negative righting lever at all angles

d)

Maximum stability

38.

As a ship with negative GM heels further, which occurs?

a)

GZ values become more negative

b)

The center of buoyancy moves further inboard

c)

The center of buoyancy eventually moves outboard to create positive GZ

d)

The righting moment increases

39.

The critical condition for a stable ship occurs at:

a)

Maximum angle of heel

b)

The waterline

c)

The angle of heel where GZ is maximum

d)

The ship's centerline

40.

A ship's transverse statical stability is most directly influenced by:

a)

The ship's length only

b)

The relative positions of G and M

c)

The cargo weight only

d)

The ship's speed

41.

The position of centre of gravity G is critical because:

a)

It determines the ship's speed

b)

It is the most influential factor in determining stability

c)

It cannot be changed during loading

d)

It equals the centre of buoyancy

42.

When a weight is shifted on board, G moves:

a)

In the opposite direction to the weight

b)

Parallel to and in the same direction as the weight

c)

Perpendicular to the weight's path

d)

In a fixed direction only

43.

The initial transverse metacentre M is important because it:

a)

Represents the centre of gravity

b)

Indicates the stability of the ship at small angles

c)

Determines the ship's maximum speed

d)

Controls cargo movement

44.

For a ship with GM = 0, when heeled and released:

a)

It returns to upright immediately

b)

It settles at an indeterminate angle

c)

It continues to heel indefinitely

d)

It oscillates continuously

45.

The relationship between KG and KM determines:

a)

The ship's trim condition

b)

Whether the ship is stable or unstable

c)

The ship's speed capability

d)

The cargo capacity

46.

When loading cargo low in the ship, the effect on stability is to:

a)

Reduce GM and increase stability

b)

Increase GM and increase stability

c)

Reduce GM and reduce stability

d)

Have no effect on stability

47.

The vertical movement of centre of gravity when loading a weight is independent of:

a)

The weight of the item loaded

b)

The position of the loaded weight

c)

The ship's initial displacement

d)

The colour of the cargo

48.

A ship with positive GM but very small value would have:

a)

Excellent stability

b)

Marginal stability and could become unstable easily

c)

Neutral stability

d)

No stability

49.

The centre of buoyancy constantly moves as the ship heels because:

a)

The keel breaks apart

b)

The underwater volume changes shape

c)

The cargo shifts

d)

The center of gravity moves

50.

Understanding stability conditions is essential for officers to:

a)

Navigate faster

b)

Calculate fuel consumption

c)

Ensure safe loading and seaworthiness

d)

Determine cargo weight

51.

The shift of centre of gravity formula (GGy = w × d / W) demonstrates:

a)

Stability is independent of weight movements

b)

G moves in proportion to weight times distance divided by total displacement

c)

Only heavy items affect stability

d)

Light items have no effect on G

52.

A ship becomes unstable primarily when:

a)

It loads cargo in the hold

b)

The centre of gravity rises too high

c)

It ballasts the lower tanks

d)

It reduces draught

53.

The significance of the righting moment in stability is that it:

a)

Measures ship's speed

b)

Represents the force attempting to return ship to upright

c)

Calculates cargo weight limits

d)

Determines the ship's length

54.

The angle of loll represents a critical point where:

a)

The ship is most stable

b)

The ship has zero GZ despite heeling

c)

The righting moment is maximum

d)

The crew is safest

55.

Multiple weight movements must be calculated together because:

a)

Each weight has no individual effect

b)

The cumulative effect on G position is what matters

c)

They cancel each other out

d)

Only the largest weight matters

56.

The fundamental principle connecting G and stability is that:

a)

G position is irrelevant to stability

b)

Higher G always means better stability

c)

G position is the most influential factor on stability

d)

G never moves on a loaded ship

57.

When a ship heels and the buoyancy force's line of action passes through M, this indicates:

a)

The ship is at maximum speed

b)

The ship is at the angle of loll

c)

The ship has positive stability at that angle

d)

The ship will capsize

58.

The concept of "initial" metacentre applies because:

a)

It is only relevant at zero heel

b)

It remains fixed only for small angles of heel

c)

It is calculated at the start of loading

d)

It indicates the first weight loaded

59.

The relationship between KB and KM demonstrates that:

a)

They are always equal

b)

KM depends on both KB and BM

c)

Only KB affects stability

d)

KM is independent of ship form

60.

A ship with zero GM but external force applied will:

a)

Definitely capsize

b)

Settle at an indeterminate angle when force is removed

c)

Return immediately to upright

d)

Maintain its position

61.

The effect of shifting weight vertically upward is equivalent to:

a)

Discharging weight from the ship

b)

Loading weight at a higher position

c)

Raising the centre of gravity

d)

Lowering the metacentre

62.

The critical nature of negative GM lies in:

a)

It indicates the ship is still stable

b)

It means the ship will not remain upright

c)

The ship will immediately capsize

d)

It has no effect on ship behavior

63.

In a neutral stability condition, the horizontal separation between weight and buoyancy force lines indicates:

a)

The ship will heel further

b)

No righting moment exists at small angles

c)

Maximum stability has been achieved

d)

The ship is in danger of capsizing

64.

The practical significance of understanding transverse statical stability is:

a)

To calculate fuel efficiency

b)

To ensure safe loading and adequate seaworthiness

c)

To determine maximum speed

d)

To calculate cargo value

65.

When centre of gravity is above the metacentre, the mathematical consequence is:

a)

GM equals BM

b)

GM becomes negative

c)

GM equals KB

d)

GM cannot be calculated

66.

The relationship between KG movements and stability changes shows that:

a)

Small changes in KG have no effect

b)

KG changes directly affect the GZ values

67.

The angle of loll phenomenon demonstrates that:

a)

All unstable ships will capsize

b)

A ship with negative GM can achieve equilibrium at an angle

c)

Stability improves with greater heel

d)

Centre of buoyancy becomes fixed

68.

The accumulative effect of multiple weight shifts is best determined by:

a)

Adding individual GGy values

b)

Using the moments method about the keel

c)

Only considering the first weight moved

d)

Ignoring small movements

69.

The interrelationship between G, B, M, and the stability conditions shows:

a)

These points are independent

b)

Their relative positions completely determine stability

c)

Only G position matters

d)

They move together as one unit

70.

Understanding conditions of stability is fundamental for officers because:

a)

It improves navigation only

b)

It prevents loading errors and ensures ship safety

c)

It increases cargo capacity

d)

It reduces operational costs only

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