## Joule's Law - MCQ - Basic Level

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of Basic Level Questions on Joule's Law. You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. In a water-fall the water falls from a height of 100 m. If the entire kinetic energy of water is converted into heat, the rise in temperature of water will be

•  0.23°C
•  0.46°C
•  2.3°C
•  0.023°C

Q2. A lead bullet of 10 g travelling at 300 m/s strikes against a block of wood and comes to rest. Assuming 50% of heat is absorbed by the bullet, the increase in its temperature is (specific heat of lead = 150J/kg, K)

•  100°C
•  125°C
•  150°C
•  200°C

Q3. The mechanical equivalent of heat J is

•  A constant
•  A physical quantity
•  A conversion factor
•  None of these

Q4. The S.I. unit of mechanical equivalent of heat is

•  Joule x Calorie
•  Joule / Calorie
•  Calorie x Erg
•  Erg / Calorie

Q5. A lead ball moving with a velocity V strikes a wall and stops. If 50% of its energy is converted into heat, then what will be the increase in temperature (Specific heat of lead is S)

•  2V2/JS
•  V2/4JS
•  V2S/J
•  V2S/2J

Q6. A 10kg mass falls through 25 m on to the ground and bounces to a height of 0.50 m. Assume that all potential energy lost is used in heating up the mass. The temperature rise will be (Given specific heat of the material is 252 Joule/kg K)

•  0.95 K
•  0.095 K
•  0.0095 K
•  None of these

Q7. 4200 J of work is required for

•  Increasing the temperature of 10 gm of water through 10°C
•  Increasing the temperature of 100 gm of water through 10°C
•  Increasing the temperature of 1 kg of water through 10°C
•  Increasing the temperature of 10 kg of water through 10°C

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