Revision of maths skills

• Science
• Lower Secondary (Key Stage 3)

Revision of maths skills

What is the law of conservation of energy?

1. Energy cannot be created or destroyed
2. Energy can only be created
3. Energy can be created and destroyed
4. Energy can only be destroyed

Which of the following is an example of the conservation of energy?

1. A moving car
2. A burning candle
3. A swinging pendulum
4. A rolling ball

What happens to the total energy in a closed system?

1. It does not change
2. It remains constant
3. It increases over time
4. It decreases over time

What is the equation for work?

1. work = power x time
2. work = velocity x time
3. work = force x distance
4. work = mass x acceleration

What is the unit of force in the equation?

1. distance
2. work
3. time
4. force

What happens to the work done if the distance is increased?

1. The work done remains the same
2. The work done becomes negative
3. The work done decreases
4. The work done increases

What is the formula to calculate distance?

1. Distance = Speed - Time
2. Distance = Speed ÷ Time
3. Distance = Speed + Time
4. Distance = Speed × Time

What is the formula for efficiency?

1. Efficiency = useful energy output / total energy input
2. Efficiency = useful energy output + total energy input
3. Efficiency = total energy input / useful energy output
4. Efficiency = useful energy output * total energy input

How is efficiency calculated?

1. By dividing useful energy output by total energy input
2. By multiplying useful energy output with total energy input
3. By subtracting useful energy output from total energy input
4. By adding useful energy output and total energy input

What does efficiency measure?

1. The difference between useful energy output and total energy input
2. The useful energy output
3. The ratio of useful energy output to total energy input
4. The total energy input

What is the formula for power?

1. power = energy transferred - time
2. power = energy transferred + time
3. power = energy transferred * time
4. power = energy transferred / time

If the energy transferred is 500 Joules and the time taken is 10 seconds, what is the power?

1. 50 Watts
2. 500 Watts
3. 50 Joules
4. 5 Watts