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حرارت، حرکیات حرارت اور سیال

Written by Dr. Hamza Farooq (Physics)

ایم ڈی کیٹ · طبیعیات · 6 سوالات

نام: ____________________   تاریخ: ____________

  1. A gas absorbs 500 J of heat and does 200 J of work. What is the change in its internal energy?

    • A 500 J
    • B 700 J
    • C 200 J
    • D 300 J

  2. What pressure does a force of 100 N exert on an area of 0.5 m²?

    • A 500 Pa
    • B 20 Pa
    • C 200 Pa
    • D 50 Pa

  3. How much heat is needed to raise the temperature of 2 kg of water by 5 degrees C? (Specific heat of water = 4200 J/kg per degree C)

    • A 4200 J
    • B 84000 J
    • C 42000 J
    • D 21000 J

  4. Absolute zero is:

    • A 0 degrees C
    • B -273.15 degrees C
    • C -373 degrees C
    • D -100 degrees C

  5. According to Bernoulli's principle, in a horizontal flow of a fluid, where the speed is higher:

    • A The pressure is lower
    • B The pressure is higher
    • C The density increases
    • D The pressure is unchanged

  6. Archimedes' principle says that the upthrust on a body in a fluid equals:

    • A The density of the fluid
    • B The weight of the body
    • C The weight of the fluid displaced
    • D The volume of the body only

جوابی کلید

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

  1. By the first law, change in internal energy = Q - W = 500 - 200 = 300 J.

  2. Pressure = force / area = 100 / 0.5 = 200 Pa.

  3. Q = mc x temperature change = 2 x 4200 x 5 = 42000 J.

  4. Absolute zero, 0 K, is equal to -273.15 degrees C. It is the lowest possible temperature.

  5. A faster-moving fluid has lower pressure. This is how an aeroplane wing helps produce lift.

  6. The buoyant force is equal to the weight of the fluid pushed aside by the body.