1. The standard scale of temperature is
1) The mercury scale 2) The gas scale
3) The platinum resistance scale 4) Liquid scale
Ans: (2)
2. For measurements of very high temperature say around 5000oC (of Sun) one can use:
1) Gas thermometer 2) Platinum resistance thermometer
3) Vapour pressure thermometer 4) Pyrometer
Ans: (4)
3. Thermometric liquid used to measure upto -100oC is
1) Alcohol 2) Mercury 3) Water 4) Benzene
Ans: (1)
4. Which of the following is smallest raise in temperature?
1) 1oF 2) 1oR 3) 1oK 4) 1oC
Ans: (1)
5. The range of clinical thermometer is
1) 37oC to 42oC 2) 95oF to 110oF
3) 90oF to 112oF 4) 95oC to 104oC
Ans: (2)
6. Solids expand on heating because
1) The K.E. of atoms increases 2) P.E. of atoms increases
3) Total energy of atoms increases 4) K.E. of atoms decreases
Ans: (1)
7. A ring shaped piece of metal is heated, if the material expands, the hole will
1) Contract 2) Expand
3) Remains same 4) Expand (or) Contract depending on the width
Ans: (2)
8. The coefficient of linear expansion of a metal rod is 12 × 106/°C, its value in per oC, its value in per oF
Ans: (1)
9. A pendulum clock shows correct time at 0oC. At a higher temperature the clock
1) loses time 2) gains time
3) neither loses nor gains time 4) will not operate
Ans: (1)
10. In balance wheel of watch, the factors that make its oscillations uniform are
1) tension in the string 2) moment of inertia of balanced wheel
3) temperature 4) pressure
Ans: (2)
11. The diameter of a metal ring is D and coefficient of linear expansion is ∝. If the temperature of the ring is increased by 1o, the circumference and area of the ring will increased by
Ans: (4)
12. An iron rod of length 50 cm is joined at an Aluminium rod of length 100 cm. All measurements refer to 20oC. The coefficient of Iron & Aluminium are 12 × 10-6 /oC, 24 × 10-6 /oC, the average coefficient of composite system is
1) 36 × 10-6 /oC 2) 12 × 10-6 /oC
3) 20 × 10-6 /oC 4) 48 × 10-6 /oC
Ans: (3)
13. Assertion (A): A metallic plate containing circular hole is heated then the size of the hole increases.
Reason (R): Expansion of the solid always take place radially outwards.
1) A & R are correct and R is correct explanation for A.
2) A & R are correct and R is not correct explanation for A.
3) A is true and R is false.
4) A is wrong and R is true.
Ans: (1)
14.
| List - I | List - II |
| (a) Thermal expansion | (e) Pendulum clock |
(b)  ,  , |
(f) Depends on dimension, material, temperature |
| (c) Bimetallic strip | (g) Depends on nature of material only |
| (d) Invar steel | (h) Balance wheel of a watch |
1) a - e, b - f, c - g, d - h 2) a - g, b - h, c - e, d - f
3) a - f, b - g, c - h, d - e 4) a - h, b - e, c - f, d - g
Ans: (3)
1) a-g, b-h, c-e, d-f 2) a-h, b-e, c-g, d-f
3) a-e, b-g, c-f, d-h 4) a-f, b-e, c-h, d-g
Ans: (1)
16. A mercury thermometer is transferred from melting ice to a hot liquid. The mercury rises to 
of the distance between two fixed points. Find the temperature of liquid in Fahrenheit scale.
1) 194oF 2) 162oF 3) 113oF 4) 112oF
Ans: (1)
17. Two absolute scales A and B have triple points of water defined to be 200 A and 300 B (given triple point of water is = 276.16 K). The relation between ToA and ToB is
Ans: (2)
18. A faulty thermometer has its fixed points marked at 6° and 96°. What is the correct temperature on the centigrade scale when this thermometer reads 87°?
1) 83°C 2) 93°C 3) 90°C 4) 85°C
Ans: (3)
19. A Centigrade thermometer and Fahrenheit thermometer are dipped in boiling water. The water temperature is lowered until the Fahrenheit thermometer registers 140°. What is the fall in temperature as registered by centigrade thermometer?
1) 30° 2) 40° 3) 60° 4) 80°
Ans: (2)
20. A metal plate of area 1.2 m2 increases its area by 2.4 × 10-4 m2 when it is heated from 0° C to 100° C. The coefficient of cubical expansion of the metal expressed in per °C is
1) 2 × 10-6 2) 4 × 10-6 3) 6 × 10-6 4) 3 × 10-6
Ans: (4)
21. A clock while keeps correct time at 30°C has a pendulum rod made of brass. The number of seconds it gains (or) loses per second when the temperature falls to 10°C is (αof brass : 18 × 10-6 /°C)
1) 18 × 10-6 sec 2) 18 × 10-5 sec 3) 0.0018 sec 4) 0.018 sec
Ans: (2)
22. A wire of length 100 cm increases in length by 10-2 m when it is heated through 100°C. The coefficient of linear expansion of material of the wire expressed in /K units is
23. A thin brass sheet at 10°C and thin steel sheet at 20°C have the same surface area. The common temperature at which both would have the same area (α brass = 19 × 10-6 /°C, αsteel = 11 × 10-6 /°C)
1) -3.75 °C 2) -2.75 °C 3) 2.75 °C 4) 3.75 °C
Ans: (1)
24. The diameter of iron wheel is 1 cm. If its temperature is increased by 700 °C. What is the increase in circumference of the wheel α = 12 × 10-6 /°C?
1) 0.0264 cm 2) 0.264 cm 3) 2.64 cm 4) 26.4 cm
Ans: (1)
25. Two uniform rods one of Aluminium of length l1 and another made of Steel of length l2 and linear coefficients of expansion αa and αs respectively are connected to form a single rod of length l1 + l2. When temperature of the combined rod is raised by t°C, the length of each rod is raised by same amount, then 
is
Ans: (1)
26. The coefficient of the linear expansion changes from α1 to α2 linearly in a rod of length 'l', the increase in length of 10°C rise of temperature
1) 5l (1 + α1α2) 2) 5l (α1 + α2) 3) 5l (α1 - α2) 4) 5l2 (α2α1 + 1)
Ans: (2)
27. Coefficient of linear expansion of a crystal in 3 mutually perpendicular directions are 8.5 × 10-6 /°C, 10.5 × 10-6 /°C, 11 × 10-6 /°C. If mass of crystal is 25 gm, its volume at
60°C is (given density at 0°C is 5 gm/cc)
1) 5.009 cc 2) 4.991 cc 3) 5.9 cc 4) 5.999 cc
Ans: (1)
28. A steel tape is calibrated at 20°C. When the temperature of the body is -10°C, the % error in the measurement with the tape is (α = 12 × 10-6 /oC)
1) 3.6% 2) 0.36% 3) 0.18% 4) 0.036%
Ans: (4)
29. Two straight metallic strips each of thickness 't' and length 'L' are rivitted together. Their coefficients of linear expansions are α1 and α2. If they are heated through temperature 
, the bimetallic strip will bend to form an arc of radius
Ans: (2)
