PHYS  101      CHAPTER  11    QUIZ

PART  I      Multiple Choice
  1. * In raising the temperature of a 2 kg piece of metal from 20 degrees C to 100 degrees C 61.8kJ of heat is added.What is the specific heat of this metal
    A. 1.8kJ/kg.K
    B. 0.39kJ/kg.K
    C. 0.79kJ/kg.K
    D. 5.7kJ/kg.K
    E. none of the above
  2. * The quantity of heat absorbed by a metal of specific heat .21 cal/g.C, mass 25.6g when its temperature changes from34.6C to 54.6 C
    A. 23cal
    B. 0.23cal
    C. 14cal
    D. 107 cal
    E. none of the above
  3. * A pond has 8x10^9 kg of water which has a specific heat of 4180J/kg.c warms from 10 C to 15 c.The heat transferred to the lake is
    A. 3x10^18 J
    B. 1.7x10^4 J
    C. 4x10^4 J
    D. 6.7x10^2 J
    E. none of the above
  4. * In each second of fall, the distance a freely-falling object will fall is
    A. about 5 meters
    B. about 10 meters
    C. the same
    D. increasing
    E. none of the above
  5. * When a rock thrown straight upwards gets to the exact top of its path, its
    A. velocity is zero and its acceleration is zero
    B. velocity is zero and its acceleration(magnitude) is about 10 m/s/s
    C. velocity is about 10 m/s and its acceleration is zero
    D. velocity is about 10 m/s and its acceleration is about 10 m/s/s
    E. none of the above


PART  II      Fill in Blanks
[NOTE : Make sure that your answers are in the dimensions shown]

6. Heat is added to 0.5Kg of watr at 20 degrees C .How many joules of heat are required to change the water to steam Joules
7. A 0.3 kg of ice is placed in a litre of water at 20 degrees C Assuming no heat is lost ,the final temperature of the water is degC
8. Fifteen kilocalories would raise the temperature of three liters of water by how many degrees degC
9. When 2100J of heat is removed from 0.10 kg of a substance its temperature is observed to decrease from 40 degC to 10 degc.Its specific heat is J/kg.degC
10. How much heat must be added to 0.75 KG of lead at room temperature to cause it to melt Joules


PART  III     True  or  False
  1. Steam at 100 degrees C will burn your hand just as severely as water at 100 degrees C
    True
    False
  2. Heat is a scaler quantity.
    True
    False
  3. Heat is energy
    True
    False
  4. Temperature of the ice changes as ice melts to water (solid to liquid phase)
    True
    False
  5. 1Kg of water needs more heat to change from water(Liquid) to steam(vapour) than ice(solid) to water(liquid)
    True
    False

Questions wrong