Energy Practice Questions
ATAR (Australia) · ATAR Physics · 144 free MCQs with instant results and detailed explanations.
144
Total
51
Easy
70
Medium
23
Hard
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Sample Questions from Energy
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Q1
Easy
If a ball is lifted to a height of 5 meters, what is its potential energy (PE) if its mass is 2 kg? (Use g = 9.8 m/s²)
A.
98 Joules
B.
19.6 Joules
C.
49 Joules
D.
10 Joules
Show Answer & Explanation
Correct Answer: A
Potential energy is calculated using the formula PE = mgh. Here, m = 2 kg, g = 9.8 m/s², and h = 5 m, so PE = 2 * 9.8 * 5 = 98 Joules.
Q2
Easy
A light bulb converts electrical energy into light and heat. Which of the following best describes this process?
A.
Conservation of energy
B.
Energy transformation
C.
Mechanical energy
D.
Kinetic energy
Show Answer & Explanation
Correct Answer: B
The conversion of electrical energy into light and heat in a light bulb is an example of energy transformation. The energy changes form from electrical to other types of energy.
Q3
Easy
Which of the following is the unit of energy in the International System of Units (SI)?
A.
Joule
B.
Newton
C.
Watt
D.
Pascal
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Correct Answer: A
The Joule is the standard unit of energy in the SI system, defined as the energy transferred when one newton of force is applied over a distance of one meter.
Q4
Medium
Which of the following best describes kinetic energy?
A.
Energy of an object due to its position.
B.
Energy stored in an object due to its deformation.
C.
Energy possessed by a body due to its motion.
D.
Energy transferred due to temperature difference.
Show Answer & Explanation
Correct Answer: C
Kinetic energy refers to the energy that an object possesses due to its motion. It is directly proportional to the mass of the object and the square of its velocity.
Q5
Medium
A 2 kg object is moving with a velocity of 3 m/s. What is its kinetic energy?
A.
9 J
B.
6 J
C.
18 J
D.
3 J
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Correct Answer: A
The kinetic energy (KE) can be calculated using the formula KE = 0.5 * m * v^2. In this case, KE = 0.5 * 2 kg * (3 m/s)^2 = 9 J.
Q6
Medium
Which form of energy is primarily associated with the height of an object above a reference point?
A.
Mechanical energy
B.
Kinetic energy
C.
Potential energy
D.
Thermal energy
Show Answer & Explanation
Correct Answer: C
Potential energy is the energy stored in an object due to its height above the ground. It depends on both the mass of the object and the height in a gravitational field.
Q7
Medium
A 2 kg object is lifted to a height of 5 meters. What is the gravitational potential energy gained by the object? (Use g = 9.8 m/s²)
A.
98 J
B.
19.6 J
C.
40 J
D.
10 J
Show Answer & Explanation
Correct Answer: A
The gravitational potential energy is given by the formula PE = mgh. Here, m = 2 kg, g = 9.8 m/s², and h = 5 m. Therefore, PE = 2 * 9.8 * 5 = 98 J.
Q8
Hard
A car with a mass of 1000 kg is traveling at a speed of 25 m/s when it suddenly comes to a stop. What is the work done on the car by the brakes?
A.
-312500 J
B.
-62500 J
C.
312500 J
D.
62500 J
Show Answer & Explanation
Correct Answer: A
The work done on the car brings it to a stop, equating to the negative change in kinetic energy. Kinetic Energy = (1/2)mv² = (1/2) * 1000 kg * (25 m/s)² = 312500 J. The work done by brakes is -312500 J, as energy is taken out of the system.
Q9
Hard
A 2 kg object is lifted to a height of 5 m. What is the potential energy gained by the object? (Take g = 9.81 m/s²)
A.
98.1 J
B.
19.62 J
C.
20 J
D.
49.05 J
Show Answer & Explanation
Correct Answer: A
The potential energy (PE) gained by an object is calculated using the formula PE = mgh, where m is mass (2 kg), g is the acceleration due to gravity (9.81 m/s²), and h is height (5 m). Thus, PE = 2 kg * 9.81 m/s² * 5 m = 98.1 J.
Q10
Hard
A spring with a spring constant of 250 N/m is compressed by 0.2 m. What is the elastic potential energy stored in the spring?
A.
5 J
B.
10 J
C.
1 J
D.
20 J
Show Answer & Explanation
Correct Answer: B
The elastic potential energy (EPE) stored in a spring is given by the formula EPE = 1/2 k x², where k is the spring constant (250 N/m) and x is the compression (0.2 m). Thus, EPE = 1/2 * 250 * (0.2)² = 10 J.
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Energy — ATAR (Australia) ATAR Physics Practice Questions Online
This page contains 144 practice MCQs for the chapter Energy in ATAR (Australia) ATAR Physics. The questions are organized by difficulty — 51 easy, 70 medium, 23 hard — 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.