# Education In Pakistan

## Physics Mcqs Test Preparation

Physics Mcqs Test Preparation

1. The degree of hotness or coldness of an object is expressed in terms of:
a) Heat capacity b) Heat
c) Temperature d) Heat energy
C
2. Which of the following properties of matter is used in the construction of a thermometer:
a) Expansion of matter on heating b) Change of color with temperature
c) Increase of resistance with rise of temperature d) All of these
D
3. Mercury is used in mercury-in-glass thermometer as a thermometric substance because:
a) It does not wet the capillary tube walls b) It is opaque
c) Its expansion is uniform over a wide range of temperature
d) All of above
D
4. Two fixed points used for the temperature scales are:
a) The temperature of freezing and boiling mercury
b) The temperature of melting ice and boiling water
c) The temperature of water at 0oC and 100oC d) None of these
B
5. In liquid-in-glass thermometer, the thermometric property used is:
a) Thermal expansion b) Color change on heating
c) Resistance change on heating d) None of these
A
6. The lower and upper fixed points on Celsius (centigrade) scale are taken to be:
a) 0o and 212o b) 32o and 273o
c) 0o and 100o d) None of these
C
7. A Celsius (centigrade) degree is greater than a Fahrenheit degree by:
a) 5/9 b) 9/5
c) 18/5 d) 9/10
B
8. The Centigrade and Fahrenheit scales have the same reading at:
a) 40o b) 140o
c) -140o d) -40o
D
9. The relationship between Celsius and Fahrenheit scales temperature is:
a) Fo = 9/5 Co – 32 b) Fo = 9/5 Co + 32
c) Co = 9/5 Fo + 32 d) None of these
B
10. The temperature of a normal human body is 98.6 Fo. This temperature corresponds to:
a) 20 Co b) 30 Co
c) 37 Co d) 66.6 Co
C
11. The temperature of normal human body is 37 Co. On Kelvin scale, it is equal to:
a) 373 Ko b) 273 Ko
c) 310 Ko d) 236 Ko
C
12. One degree of centigrade scale is equal to:
a) 1o of Fahrenheit b) 1.8o of Fahrenheit
c) 32o of Fahrenheit d) 3o of Fahrenheit
B
13. 10 Co corresponds to:
a) 273o K b) 283o K
c) 263o K d) 100o K
B
14. The temperature of absolute zero corresponds to:
a) -273 Co b) 273 Co
c) 0 Co d) 20 Co
A
15. What temperature on Fahrenheit scale corresponds to absolute zero?
a) 212o F b) 32o F
c) -32o F d) -460o F
D
16. One Calorie is equal to:
a) 41.8 J b) 4.18 J
c) 18.4 J d) 4.35 J
B
17. SI unit of heat energy is:
a) Calorie b) B.T.U.
c) Joule d) Kilo-Calorie

18. Absolute zero is considered to be the temperature at which:
a) All gases become liquids b) All liquids become gases
c) Water freezes d) Molecular motion in gases would cease
A
19. The Kelvin and Fahrenheit scales show the same reading at:
a) 57.42o b) 5.74o
c) 574.25o d) -574.25o
C
20. Which of the following does not have the same units:
a) Mechanical energy b) Kinetic energy
c) Heat energy d) Power
D
21. Melting point of ice and boiling point of water in Fahrenheit scale are taken as:
a) 0o and 100o b) 32o and 272o
c) 100o and 373o d) 32o and 212o
D
22. Which of the following represents the total energy of the molecules of the substance:
a) Translational K.E. and rotational K.E. b) Rotational K.E. and Vibrational K.E.
c) Vibrational K.E., Translational K.E. and Potential energy
d) Translational K.E, Vibrational K.E, rotational K.E. and Potential energy
B
23. The average K.E of all the molecules in a substance is a measure of:
a) Heat energy b) Temperature
c) Boiling point d) Specific heat
B
24. The total sum of all the energies of the molecules in a substance is called:
a) Heat energy b) Kinetic energy
c) Temperature d) Potential energy
A
25. Keeping temperature of gas constant, the Boyl’s law can be expressed as:
a) Va P b) Va 1/P
c) Va 1/T d) P a V
B
27. When pressure of gas remains constant, the Charle’s law can be expressed as:
a) Va T b) Va 1/T
c) Va P d) None of these
A
28. At constant pressure, the graph between volume (V) and temperature (T) is:
a) A curve b) A parabola
c) A hyperbola d) A straight line
D
29. Real gases strictly obey gas laws at:
a) Low pressure & low temperature b) High pressure & low temperature
c) Low pressure & high temperature d) High pressure & high temperature
C
30. “Volume of a gas is directly proportional to its temperature (absolute) while keeping pressure constant”, this
is called:
a) Boyl’s law b) Charle’s law
c) Ideal gas law d) None of these
B
31. “Volume of a gas is inversely proportional to its pressure while keeping temperature constant”, this is
called:
a) Boyl’s law b) Charle’s law
c) Ideal gas law d) None of these
A
32. For a gas obeying Boyl’s law if the pressure is doubled, the volume becomes:
a) Three fold b) Double
c) One-half d) Remains the same
C
33. The K.E. of the molecules of an ideal gas at absolute zero will be:
a) Zero b) Infinite
c) Very high d) Below zero
A
34. At absolute zero of temperature, the molecules have:
a) Rotational K.E b) Translational K.E
c) Maximum energy d) Zero energy
D
35. In an ideal gas, the molecules have:
a) Kinetic energy only b) Potential energy only
c) Both Kinetic and Potential energies d) None of these

36. The molecules of the gas exert pressure on the walls of the container due to:
a) Their velocity b) Their continuous collision
c) Their free motion d) Their energy
B
37. The relation between Boltzman constant K, gas constant R and Avogadro’s number NA is:
a) K = NA/R b) K= RNA
c) K = R/NA d) K = R – NA
C
38. The pressure exerted by the gas molecules is:
a) Inversely proportional to average translational K.E. of molecules b)
Directly proportional to average translational K.E. of molecules
c) Inversely proportional to number of molecules per unit volume of the gas d)
None of the above
B
39. The absolute temperature of an ideal gas is:
a) Directly proportional to average translational K.E. of the molecules b)
Inversely proportional to average translational K.E. of the molecules
c) Directly proportional to the universal gas constant
d) None of the above
A
41. Heat is form of energy associated with:
a) Molecular mass b) Molecular motion
c) Molecular weight d) None of these
B
42. The pressure of gas, at constant temperature, varies with density as:
a) P a 1/ r b) P a 1/ r2
c) P a r d) P a r2
C
43. When the pressure is increased, the boiling point of liquid:
a) Increases b) Decreases
c) Remains unchanged d) All of these
A
44. The pressure is measured in units of:
a) Pascal b) Atmosphere
c) N/m2 d) All of these
D
45. The change in length per unit length per Kelvin rise temperature is called:
a) Coefficient of superficial expansion b) Coefficient of volume expansion
c) Coefficient of linear expansion d) None of these
C
46. The linear thermal expansion is related to:
a) Liquids only b) Gases only
c) Both liquids and gases d) Solids only
D
47. When most substances are heated:
a) They expand b) Their volume increases
c) Their density decreases d) All of these
D
48. The change in volume per unit volume per Kelvin rise in temperature is called:
a) Coefficient of linear expansion b) Coefficient of thermal conductivity
c) Temperature coefficient d) Coefficient of volume expansion
D
49. The relation between coefficient of linear expansion ( a ) and coefficient of volume expansion ( b ) is:
a) b = a /2 b) b = a
c) b = 2 a d) b = 3 a
D
50. An inflated tyre suddenly bursts, due to which the temperature of air:
a) Decreases b) Increases
c) Remains the same d) None of these

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