English

ہوم / مشق / کام اور توانائی / ورک شیٹ

آن لائن مشق کریں

کام اور توانائی

نویں جماعت · طبیعیات · 6 سوالات

نام: ____________________   تاریخ: ____________

  1. What is the SI unit of work?

    • A Joule
    • B Newton
    • C Pascal
    • D Watt

  2. How much work is done by a force of 20 N moving a body 5 m in its own direction?

    • A 15 J
    • B 25 J
    • C 100 J
    • D 4 J

  3. What is the kinetic energy of a 2 kg body moving at 3 m/s?

    • A 6 J
    • B 12 J
    • C 9 J
    • D 18 J

  4. What is the potential energy of a 5 kg mass at a height of 10 m? (g = 10 m/s2)

    • A 15 J
    • B 50 J
    • C 500 J
    • D 5 J

  5. Power is defined as:

    • A Energy x distance
    • B Force x time
    • C Work x time
    • D Work / time

  6. A machine does 600 J of work in 20 s. What is its power?

    • A 3 W
    • B 580 W
    • C 30 W
    • D 12000 W

جوابی کلید

1. A, 2. C, 3. C, 4. C, 5. D, 6. C

  1. Work is measured in joules.

  2. W = F x d = 20 x 5 = 100 J.

  3. KE = 1/2 m v2 = 0.5 x 2 x 9 = 9 J.

  4. PE = m g h = 5 x 10 x 10 = 500 J.

  5. Power is the rate of doing work: P = W / t.

  6. P = W / t = 600 / 20 = 30 W.