ECAT Pakistan · Physics

Mechanics, Energy and Properties of Matter

23 practice questions, each with the answer and an explanation.

Practise Mechanics, Energy and Properties of Matter now

Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 23 questions

  1. What force gives a mass of 18 kg an acceleration of 9 m/s²?
  2. What is the kinetic energy of a 20 kg body moving at 14 m/s?
  3. How much gravitational potential energy does a 3 kg mass gain when lifted 5 m? (take g = 10 m/s²)
  4. A force of 100 N acts at 60° to the horizontal and moves a body 6 m along the horizontal. How much work does it do?
  5. A machine does 1200 J of work in 10 s. What is its power?
  6. A force of 1000 N acts on an area of 2 m². What pressure does it exert?
  7. What is the pressure due to a column of liquid of density 1000 kg/m³ and depth 5 m? (take g = 10 m/s²)
  8. A wave has a frequency of 1000 Hz and a wavelength of 0.2 m. What is its speed?
  9. A spring of constant 100 N/m is stretched by 0.2 m. How much energy is stored in it?
  10. What is the period of a simple pendulum of length 2.5 m? (take g = 10 m/s²)
  11. A resistor of 10 Ω carries a current of 0.5 A. What is the potential difference across it?
  12. Two resistors of 8 Ω and 8 Ω are connected in parallel. What is their combined resistance?
  13. A device on a 110 V supply draws 10 A. What is its power?
  14. How much energy in kWh does a 1000 W heater use in 3 hours?
  15. Two point charges of 3 μC and 3 μC are 0.9 m apart in air. What is the force between them? (k = 9 × 10⁹ N m²/C²)
  16. A 10 μF capacitor is charged to 6 V. How much charge does it store?
  17. A transformer has 1000 turns on the primary coil and 2000 turns on the secondary. The primary voltage is 230 V. What is the secondary voltage?
  18. How much heat is needed to warm 2 kg of water by 40 °C? (specific heat capacity of water = 4200 J/(kg °C))
  19. A gas in a rigid container is at 100 kPa and 250 K. It is heated to 375 K. What is the new pressure?
  20. Light is travelling in a medium of refractive index 2. What is the critical angle at a boundary with air?
  21. An object is placed 30 cm from a convex lens of focal length 10 cm. How far from the lens is the image?
  22. A body moves in a circle of radius 5 m at 20 m/s. What is its centripetal acceleration?
  23. A body slides down a smooth slope at an angle whose sine is 3/5. What is its acceleration? (take g = 10 m/s²)

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