Puzzles on numericals

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Class 8 Physics Puzzles

Class 8 Science Puzzles

1. Pressure: A force of 200 N is applied on an area of 0.5 m². What is the pressure?

Hint: Pressure = Force / Area

Answer: 400 Pa

2. Moment of Force: A 10 N force is applied at a perpendicular distance of 2 m from the pivot. Calculate the moment of force.

Hint: Moment = Force × Perpendicular distance

Answer: 20 Nm

3. Kinetic Energy: A body of mass 5 kg is moving with a velocity of 4 m/s. Calculate its kinetic energy.

Hint: KE = 0.5 × mass × velocity²

Answer: 40 J

4. Potential Energy: Calculate the potential energy of a 2 kg object placed at a height of 10 m (g = 10 m/s²).

Hint: PE = mass × g × height

Answer: 200 J

5. Electric Power: A device uses 1200 W of power for 2 hours. How much energy does it consume?

Hint: Energy = Power × Time

Answer: 2.4 kWh

6. Pressure: A weight of 500 N is acting on a surface of 0.25 m². Calculate the pressure exerted.

Hint: Pressure = Force / Area

Answer: 2000 Pa

7. Moment of Force: A torque of 50 Nm is produced by a force of 10 N. Find the perpendicular distance.

Hint: Distance = Moment / Force

Answer: 5 m

8. Kinetic Energy: An object of mass 8 kg is moving at 3 m/s. Calculate its kinetic energy.

Hint: KE = 1/2 × mass × velocity²

Answer: 36 J

9. Potential Energy: Find the potential energy of a 3 kg mass placed at a height of 15 m (g = 10 m/s²).

Hint: PE = mass × g × height

Answer: 450 J

10. Electric Energy: A bulb of 60 W is used for 5 hours. Calculate the energy consumed in kWh.

Hint: Energy = Power × Time

Answer: 0.3 kWh

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