Forces and Pressure Practice Questions
SPM (Malaysia) · SPM Physics · 144 free MCQs with instant results and detailed explanations.
144
Total
45
Easy
77
Medium
22
Hard
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Sample Questions from Forces and Pressure
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Q1
Easy
What is the SI unit of force?
A.
Newton
B.
Pascal
C.
Joule
D.
Kilogram
Show Answer & Explanation
Correct Answer: A
The SI unit of force is the Newton (N), which is defined as the force required to accelerate a one-kilogram mass by one meter per second squared.
Q2
Easy
Which of the following changes will decrease the pressure exerted by a gas in a closed container?
A.
Increasing the temperature
B.
Decreasing the volume
C.
Decreasing the number of gas particles
D.
Increasing the container's size
Show Answer & Explanation
Correct Answer: C
Decreasing the number of gas particles reduces the frequency of collisions with the walls of the container, thus lowering the pressure. According to the ideal gas law, pressure is directly proportional to the number of particles.
Q3
Easy
A 5 kg object is resting on a horizontal surface. What is the weight of the object?
A.
50 N
B.
5 N
C.
15 N
D.
20 N
Show Answer & Explanation
Correct Answer: A
Weight is calculated using the formula Weight = mass ร gravitational acceleration. With mass = 5 kg and gravitational acceleration โ 10 m/sยฒ, the weight is 5 kg ร 10 m/sยฒ = 50 N.
Q4
Medium
A force of 20 N is applied to an area of 5 mยฒ. What is the pressure exerted on the surface?
A.
4 Pa
B.
5 Pa
C.
20 Pa
D.
25 Pa
Show Answer & Explanation
Correct Answer: A
Pressure is calculated using the formula P = F/A. Here, P = 20 N / 5 mยฒ = 4 Pa.
Q5
Medium
A hydraulic press exerts a force of 5000 N on a small piston with an area of 0.01 mยฒ. What is the pressure in the hydraulic fluid?
A.
500000 Pa
B.
450000 Pa
C.
60000 Pa
D.
550000 Pa
Show Answer & Explanation
Correct Answer: A
Pressure is calculated using P = F/A. Here, P = 5000 N / 0.01 mยฒ = 500000 Pa.
Q6
Medium
When a person stands on a scale, they exert a downward force of 600 N. If their feet occupy an area of 0.2 mยฒ, what pressure do they exert on the scale?
A.
3000 Pa
B.
1500 Pa
C.
2000 Pa
D.
3500 Pa
Show Answer & Explanation
Correct Answer: A
Using the pressure formula P = F/A, we have P = 600 N / 0.2 mยฒ = 3000 Pa.
Q7
Medium
A force of 10 N is applied on a surface area of 2 mยฒ. What is the pressure exerted on the surface?
A.
5 Pa
B.
20 Pa
C.
10 Pa
D.
15 Pa
Show Answer & Explanation
Correct Answer: A
Pressure is calculated using the formula Pressure = Force / Area. Here, Pressure = 10 N / 2 mยฒ = 5 Pa.
Q8
Hard
A car of mass 1200 kg is moving at a speed of 25 m/s when the driver applies the brakes, producing a constant deceleration. If the car comes to a complete stop in 10 seconds, what is the magnitude of the deceleration?
A.
2.5 m/sยฒ
B.
3.0 m/sยฒ
C.
4.0 m/sยฒ
D.
5.0 m/sยฒ
Show Answer & Explanation
Correct Answer: A
To find the deceleration, we use the formula a = (v - u) / t. Here, final velocity v = 0 m/s, initial velocity u = 25 m/s, and time t = 10 s. Thus, a = (0 - 25) / 10 = -2.5 m/sยฒ. The magnitude of deceleration is 2.5 m/sยฒ.
Q9
Hard
A hydraulic lift is used to lift a car weighing 1500 kg. If the small piston has a diameter of 5 cm and the large piston has a diameter of 20 cm, what is the force exerted on the small piston to lift the car?
A.
50 N
B.
100 N
C.
200 N
D.
400 N
Show Answer & Explanation
Correct Answer: B
The force exerted on the small piston can be calculated using the principle of hydraulic systems, which states that the pressure applied is transmitted equally throughout the fluid. The area of the small piston is 19.625 cmยฒ, and the force required to lift the car (1500 kg) is 14700 N. Therefore, using the ratio of areas (A1/A2), the force on the small piston is 100 N.
Q10
Hard
A hydraulic press uses a small piston with a diameter of 5 cm to lift a heavy object using a large piston with a diameter of 20 cm. If a force of 200 N is applied to the small piston, what is the maximum weight the large piston can lift?
A.
800 N
B.
1600 N
C.
3200 N
D.
400 N
Show Answer & Explanation
Correct Answer: B
The pressure applied is transmitted equally in all directions in a fluid, so P_small = P_large. Therefore, (F_small / A_small) = (F_large / A_large). The area of the small piston A_small = ฯ*(0.025)^2 and for the large piston A_large = ฯ*(0.1)^2. Solving gives F_large = 1600 N.
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Forces and Pressure โ SPM (Malaysia) SPM Physics Practice Questions Online
This page contains 144 practice MCQs for the chapter Forces and Pressure in SPM (Malaysia) SPM Physics. The questions are organized by difficulty โ 45 easy, 77 medium, 22 hard โ so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit.