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Physics for IGCSE & O level - Forces And Pressure (Section 1)

1
What is the term given to the turning effect of a force?
Answer
(C)
Moment
2
If an object is suspended and the plumb line position is marked by the line AB, where is the center of gravity located?
Answer
(A)
On the line AB
3
What is the term for a material that returns to its original shape after a force is removed?
Answer
(B)
Elastic
4
What is the formula used to calculate pressure?
Answer
(B)
Force / Area
5
In a spring, what is the limit of proportionality?
Answer
(A)
The point beyond which the spring is permanently stretched.
6
At a constant temperature, how does the pressure and volume of a gas relate?
Answer
(B)
Inversely proportional
7
What is the unit of measurement for the spring constant (k)?
Answer
(D)
Newtons per meter (N/m)
8
What is the relationship between the sum of clockwise moments and the sum of anticlockwise moments when an object is in equilibrium?
Answer
(C)
They are equal.
9
What defines the 'elastic limit' of a material?
Answer
(D)
Both b and c
10
What is the unit used to measure the spring constant?
Answer
(D)
Newtons per meter (N/m)
11
What do you call the force acting over a certain area?
Answer
(B)
Pressure
12
What happens to a spring if the force applied exceeds its elastic limit?
Answer
(C)
It is permanently stretched.
13
Which phrase best defines the term 'moment' in physics?
Answer
(B)
The turning effect of a force.
14
If the same force is applied over a smaller area, how does the pressure change?
Answer
(B)
Pressure increases.
15
What is the effect of a force on an object when it is in equilibrium?
Answer
(B)
The net force acting on the object is zero.
16
What does the spring constant (k) represent in Hooke's Law?
Answer
(C)
The stiffness of the spring.
17
What happens to the pressure of a gas when the volume is decreased while keeping the temperature constant?
Answer
(A)
Increases
18
How do you calculate the pressure exerted by a force?
Answer
(B)
Force / Area
19
What defines a material that is 'elastic'?
Answer
(C)
It returns to its original shape after deformation.
20
If the force increases and the area stays the same, what happens to the pressure?
Answer
(A)
Increases
21
What are the correct units for moment?
Answer
(C)
Newton-meters (Nm)
22
What describes the relationship between force applied to a spring and its extension, within its elastic limit?
Answer
(C)
The force is proportional to the extension.
23
In an ideal gas, how does the collision of molecules impact pressure?
Answer
(C)
Creates the pressure
24
Which of the following is the best way to increase pressure?
Answer
(D)
Decreasing the area and increasing the force.
25
What factors affect pressure in a liquid?
Answer
A
B
26
What is the net force on an object at rest, in terms of equilibrium?
Answer
(C)
Zero
27
According to Boyle's law, if the volume of a gas decreases, what happens to the pressure (at constant temperature)?
Answer
(A)
Increases
28
Which is a characteristic of plastic deformation?
Answer
(C)
The material undergoes a permanent change in shape.
29
Which of these can compress?
Answer
(B)
Gas
30
What happens to a gas's pressure when the volume it occupies is increased?
Answer
(B)
Decreases
31
If a spring is stretched beyond its elastic limit, what is most likely to happen?
Answer
(D)
The spring is permanently deformed.
32
What effect does increasing the area over which a force acts have on pressure?
Answer
(B)
It decreases the pressure.
33
What happens when the same force is applied over a larger area?
Answer
(B)
The pressure decreases
34
In which direction(s) does pressure act on a surface?
Answer
(D)
In all directions
35
What is the unit for measuring pressure?
Answer
(C)
Pascal
36
What happens to the boiling point of a liquid when it is moved to a higher altitude?
Answer
(B)
Decreases
37
What happens to a cone in stable equilibrium?
Answer
(B)
The cone returns to its original position.
38
Which is the correct formula for calculating pressure?
Answer
(B)
Pressure = Force / Area
39
What is the formula for pressure?
Answer
(B)
Pressure = Force / Area
40
Which of the following is the correct formula for calculating the spring constant?
Answer
(B)
k = Force / Extension
41
Which of the following is the unit for the force?
Answer
(B)
N
42
If the force is constant and the area doubles, what happens to the pressure?
Answer
(B)
Halves
43
If the temperature of a gas increases, what typically happens to its pressure (assuming constant volume)?
Answer
(A)
Increases
44
What characterizes a material that is elastic?
Answer
(C)
Returns to original shape
45
If you decrease the volume of a gas, what happens to the collisions?
Answer
(B)
Collisions increase
46
What is needed to test the principle of moments?
Answer
A
B
C
47
Which term describes the change in a spring's length when a force is applied?
Answer
(B)
Extension
48
What does it mean if the pressure is 101.3 kPa?
Answer
(B)
The pressure is the same as atmospheric pressure
49
Which of the following statements are true regarding pressure in a liquid?
Answer
A
B
D
50
What is the state of equilibrium of a ball resting at the bottom of a bowl?
Answer
(A)
Stable equilibrium