Physics Test | Class 9 Physics

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Class: 9th
Subject: Physics (SNC)
Chapter: 7 – Thermal Properties of Matter

Test Date: Current Date
Time Allowed: 60 minutes
Total Marks: 50
Paper Type: Objective + Subjective

Multiple Choice Questions (10×1 = 10 Marks)

  1. Heat is the:
    (A) total kinetic energy of the molecules
    (B) the internal energy
    (C) work done by the molecules
    (D) the energy in transit
  2. In Kelvin scale, the temperature corresponding to melting point of ice is:
    (A) zero
    (B) 32
    (C) –273
    (D) 273
  3. The temperature which has the same value on Celsius and Fahrenheit scale is:
    (A) –40
    (B) +40
    (C) +45
    (D) –45
  4. What is heat?
    (A) Form of energy
    (B) Form of matter
    (C) Form of radiation
    (D) Form of conduction
  5. What is the purpose of heat transfer through direct contact?
    (A) Conduction
    (B) Convection
    (C) Radiation
    (D) None of these
  6. What is the process of heat transfer through the movement of fluid?
    (A) Conduction
    (B) Convection
    (C) Radiation
    (D) None of these
  7. What is the temperature at which a substance changes its state from liquid to gas?
    (A) Melting point
    (B) Boiling point
    (C) Freezing point
    (D) None of these
  8. How many temperature scales are there?
    (A) One
    (B) Two
    (C) Three
    (D) Four
  9. In Kelvin scale, the upper fixed point is labeled as:
    (A) 0
    (B) 100
    (C) 273
    (D) 373
  10. Conversion of Celsius to Fahrenheit Scale is done by formula:
    (A) ( T_F = \frac{9}{5} \times T_C + 32 )
    (B) ( T_F = \frac{5}{9} (T_C – 32) )
    (C) ( T_K = T_C + 273 )
    (D) ( T_C = T_K – 273 )

Short Answer Questions (15×2 = 30 Marks)

Answer the following questions briefly.

  1. What is meant by temperature of a body?
  1. Define Heat.
  1. Which is greater an increase in temperature ( 1^\circ C ) or ( 1^\circ F )?
  1. Define the unit of temperature.
  1. Define the melting point.
  1. Define the process of conduction.
  1. Define the process of radiation.
  1. Which liquid is commonly used as liquid-in-glass thermometer?
  1. Describe Fahrenheit scale in detail.
  1. Describe Kelvin scale in detail.
  2. Why is mercury usually preferred to alcohol as a thermometric liquid?
  3. Why are the walls of the thermometer bulb made thin?
  4. Why must the inner bore be narrow?
  5. Could we make a mercury thermometer if the expansion of glass was greater than mercury?
  6. What is convection?
    ____________________________________________________

Detailed Answer Questions (Answer any 2) (2×5 = 10 Marks)

  1. What is temperature? How is it measured? Describe briefly the construction of a mercury-in-glass thermometer.
    Answer:
  1. Compare the three scales used for measuring temperature.
    Answer:
  1. Define fixed points of temperature scales. Also explain three scales of temperature.
    Answer:

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