ECAT Pakistan Ā· Physics

Waves, Heat and Optics

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

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

All 23 questions

  1. A body of volume 0.01 mĀ³ is fully immersed in a liquid of density 800 kg/mĀ³. What is the upthrust? (take g = 10 m/sĀ²)
  2. A body moving at 2 m/s accelerates uniformly at 6 m/sĀ² for 5 s. What is its final speed?
  3. What force gives a mass of 12 kg an acceleration of 2 m/sĀ²?
  4. What is the kinetic energy of a 10 kg body moving at 14 m/s?
  5. How much gravitational potential energy does a 2 kg mass gain when lifted 6 m? (take g = 10 m/sĀ²)
  6. A force of 40 N acts at 60Ā° to the horizontal and moves a body 13 m along the horizontal. How much work does it do?
  7. A machine does 600 J of work in 10 s. What is its power?
  8. A force of 1000 N acts on an area of 0.2 mĀ². What pressure does it exert?
  9. What is the pressure due to a column of liquid of density 800 kg/mĀ³ and depth 5 m? (take g = 10 m/sĀ²)
  10. A wave has a frequency of 1000 Hz and a wavelength of 0.5 m. What is its speed?
  11. A source vibrates with a frequency of 50 Hz. What is its period?
  12. A spring of constant 200 N/m is stretched by 0.3 m. How much energy is stored in it?
  13. What is the period of a simple pendulum of length 0.9 m? (take g = 10 m/sĀ²)
  14. A resistor of 2 Ī© carries a current of 3 A. What is the potential difference across it?
  15. Two resistors of 12 Ī© and 6 Ī© are connected in parallel. What is their combined resistance?
  16. A device on a 24 V supply draws 0.5 A. What is its power?
  17. How much energy in kWh does a 2000 W heater use in 4 hours?
  18. Two point charges of 2 Ī¼C and 3 Ī¼C are 0.3 m apart in air. What is the force between them? (k = 9 Ɨ 10ā¹ N mĀ²/CĀ²)
  19. A 4 Ī¼F capacitor is charged to 10 V. How much charge does it store?
  20. A wire 0.2 m long carries 10 A at right angles to a magnetic field of 2 T. What force acts on it?
  21. A transformer has 100 turns on the primary coil and 500 turns on the secondary. The primary voltage is 110 V. What is the secondary voltage?
  22. How much heat is needed to warm 5 kg of water by 40 Ā°C? (specific heat capacity of water = 4200 J/(kg Ā°C))
  23. An object is placed 30 cm from a convex lens of focal length 20 cm. How far from the lens is the image?

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