English

ہوم / مشق / کام، توانائی اور طاقت / ورک شیٹ

آن لائن مشق کریں

کام، توانائی اور طاقت

Written by Dr. Hamza Farooq (Physics)

ایم ڈی کیٹ · طبیعیات · 6 سوالات

نام: ____________________   تاریخ: ____________

  1. A force of 10 N pushes a box 5 m in the direction of the force. How much work is done?

    • A 2 J
    • B 15 J
    • C 500 J
    • D 50 J

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

    • A 18 J
    • B 6 J
    • C 3 J
    • D 9 J

  3. A machine does 600 J of work in 10 s. What is its power?

    • A 60 W
    • B 6000 W
    • C 6 W
    • D 600 W

  4. What is the gravitational potential energy of a 5 kg mass lifted 2 m? (g = 10 m/s²)

    • A 50 J
    • B 10 J
    • C 100 J
    • D 25 J

  5. A ball dropped from a height of 5 m reaches the ground with what speed? (g = 10 m/s², no air resistance)

    • A 100 m/s
    • B 50 m/s
    • C 10 m/s
    • D 5 m/s

  6. One kilowatt-hour is equal to:

    • A 6 x 10⁴ J
    • B 3.6 x 10⁶ J
    • C 1 x 10³ J
    • D 3.6 x 10³ J

جوابی کلید

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

  1. W = F x d = 10 x 5 = 50 J.

  2. KE = 1/2 mv² = 0.5 x 2 x 9 = 9 J.

  3. Power = work / time = 600 / 10 = 60 W.

  4. PE = mgh = 5 x 10 x 2 = 100 J.

  5. Potential energy turns into kinetic energy: mgh = 1/2 mv², so v = sqrt(2gh) = sqrt(100) = 10 m/s.

  6. 1 kW x 1 h = 1000 W x 3600 s = 3.6 x 10⁶ J.