Curriculum
Course: AS Physics 9702
time left:
:
:
Login

Curriculum

AS Physics 9702

1. Physical quantities and kinematics

0/41 Dr Dabour Hub Science Diagram and Course Material

2. Dynamics, forces and pressure

0/46 Dr Dabour Hub Science Diagram and Course Material

3. Work, energy, power and deformation

0/31 Dr Dabour Hub Science Diagram and Course Material

4. Waves and superposition

0/39 Dr Dabour Hub Science Diagram and Course Material

5. Electricity and D.C. circuits

0/49 Dr Dabour Hub Science Diagram and Course Material

7. Circular motion and gravitational fields (A Level)

0/25 Dr Dabour Hub Science Diagram and Course Material

8. Thermal physics (A Level)

0/37 Dr Dabour Hub Science Diagram and Course Material

10. Electric fields and capacitance (A Level)

0/36 Dr Dabour Hub Science Diagram and Course Material

11. Magnetic fields and alternating currents (A Level)

0/46 Dr Dabour Hub Science Diagram and Course Material

12. Quantum and nuclear physics (A Level)

0/44 Dr Dabour Hub Science Diagram and Course Material

13. Medical physics and astronomy (A Level)

0/42 Dr Dabour Hub Science Diagram and Course Material
Quiz

5.1.3 Efficiency – Check yourself

Submit quiz
Once you submit, you will no longer be able to change your answers. Are you sure you want to submit the quiz?
1.
A machine has an input of 500 J and a useful output of 350 J. Its efficiency is
143%
70%
35%
150 J
2.
Which efficiency value is impossible?
25%
75%
110%
100%
3.
A device of efficiency 40% has an output of 200 J. The input is
80 J
160 J
240 J
500 J
4.
Two machines of efficiency 50% and 80% are used in series. The overall efficiency is
40%
130%
65%
30%
5.
The wasted energy of a lamp is mainly
Sound
Thermal energy
Chemical energy
Gravitational energy
6.
A 100 W motor lifts a 5.0 kg mass 4.0 m in 10 s. Its efficiency is (g = 9.8)
20%
49%
196%
2.0%
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
Accepted payment methods