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Physics for IGCSE & O level - Forces And Pressure (Section 4)

1
What is the relationship between pressure and area (at a constant force)?
Answer
(B)
Inversely proportional
2
Which materials are described as plastic?
Answer
(B)
Rubber
3
What can make an object more stable?
Answer
B
C
4
If the force applied to an object is reduced while the area remains constant, what happens to the pressure?
Answer
(B)
Decreases
5
Where is the center of gravity on a symmetrical object located?
Answer
(C)
At the geometric center of the object.
6
How does increasing the area over which a force acts affect pressure?
Answer
(C)
Pressure decreases.
7
What happens to pressure inside a container of gas if you increase the number of gas molecules?
Answer
(B)
Increases
8
What is the pressure exerted by the air on the surface of the Earth?
Answer
(A)
Atmospheric pressure
9
What does the term "plastic deformation" refer to?
Answer
(B)
Permanent change in shape
10
What are the consequences of exceeding a material's elastic limit?
Answer
A
B
11
What are the primary factors that affect the pressure in a gas?
Answer
A
B
12
What is the relationship between force and pressure?
Answer
(A)
Directly proportional
13
In the context of springs, what is the 'extension'?
Answer
(B)
The change in length of the spring when a force is applied.
14
How is the stability of an object affected by its center of gravity?
Answer
A
C
15
What is the formula that relates spring constant (k), force (F), and extension (x)?
Answer
(C)
F = k * x
16
What does a moment quantify?
Answer
(B)
The turning effect of a force.
17
What unit is often used to describe the density of a liquid or gas?
Answer
(A)
kg/m³
18
If a spring's extension doubles when a force is applied, what is the relationship between the force and the spring's extension?
Answer
(B)
Directly proportional
19
What does the term 'elasticity' refer to in materials science?
Answer
(C)
The ability of a material to return to its original shape after deformation.
20
If two objects exert the same force but have different areas of contact, which object will exert greater pressure?
Answer
(B)
The object with the smaller area
21
How is pressure related to the collisions of gas molecules?
Answer
(A)
Pressure is caused by collisions
22
How does force influence pressure?
Answer
(A)
Force increases pressure
23
When a balloon rises in the atmosphere, what happens to its volume?
Answer
(A)
Increases
24
What is the meaning of the 'elastic limit' of a material?
Answer
(B)
The point beyond which the material will not return to its original shape.
25
What quantities are required to test the principle of moments?
Answer
A
B
C
26
In a state of equilibrium, what is the net force acting on an object?
Answer
(C)
Equal to zero.
27
What does a manometer measure?
Answer
(C)
Gas pressure
28
What describes the behavior of a material when the force applied exceeds its elastic limit?
Answer
(B)
The material is permanently deformed.
29
Which is an example of a plastic material?
Answer
(B)
Rubber
30
What is the net force on an object in equilibrium?
Answer
(C)
Zero.
31
Which factor is crucial in determining the turning effect of a force?
Answer
(D)
Both the force and the distance from the pivot point.
32
What is a synonym for standard atmospheric pressure?
Answer
(C)
Normal pressure
33
In the context of liquids, which way(s) does pressure act?
Answer
(D)
In all directions
34
In Hooke's Law, what is the relationship between the force applied to a spring and its extension?
Answer
(B)
They are directly proportional within the elastic limit.
35
Which factors affect the stability of an object?
Answer
A
B
C
36
In a closed system, what will happen to the force applied to an incompressible fluid?
Answer
(B)
The force is transmitted equally
37
What is the unit for measuring force in the SI system?
Answer
(B)
Newton (N)
38
What is the term for materials that can be easily stretched but return to their original form?
Answer
(B)
Elastic
39
What does Hooke's Law state regarding springs?
Answer
(B)
Force is directly proportional to extension within the elastic limit.
40
When a diver goes deeper in the ocean, what will change?
Answer
(B)
The pressure
41
Which of the following describes the units for pressure?
Answer
A
B
D
42
If force is doubled, what happens to the pressure (assuming the area remains constant)?
Answer
(A)
Doubles
43
Which law is most directly related to the behavior of gases?
Answer
(B)
Boyle's Law
44
If you double the force while halving the area, what happens to the pressure?
Answer
(B)
Quadruples
45
In general, what will happen to the pressure inside a container if more gas is added (assuming the volume is fixed)?
Answer
(B)
Pressure increases
46
What is the unit of measurement for area?
Answer
(B)
m²
47
What does pressure primarily measure in the context of a gas?
Answer
(C)
The collisions of gas molecules
48
What is Boyle's Law primarily concerned with?
Answer
(C)
Pressure and volume
49
What happens to a balloon if the air pressure outside it decreases?
Answer
(B)
It expands
50
What does the area represent when calculating pressure?
Answer
(A)
The surface the force is applied to