thermometry, expansion & calorimetry.pptxthermometry, expansion & calorimetry.pptx

1. - Ram Lal Shah

2. Thermometry

3. Q. The upper fixed point and lower fixed point for a faulty
thermometer are 100 oC and -5 oC. This thermometer
gives the reading for actual temperature of 50 oC is
a. 62.5 oC
b. 57.2 oC
c. 52.5 oC
d. 42.5 oC

4. Q. Two thermometers X and Y have ice points marked at 15
0C and 25 0C respectively and steam points 75 0C and 125
0C respectively. If X measures temperature of a bath as 60
0C , then Y measures temperature of the same bath as
a. 100 0C
b. 75 0C
c. 80 0C
d. 90 0C

5. Q. The resistant of platinum resistance thermometer at 0 oC
and 100 oC are 2 Ω and 2.5 Ω. The resistance will be
2.3 Ω at
a. 30 oC
b. 40 oC
c. 50 oC
d. 60 oC

6. Q. The sine of angle made by line with oC-axis when graph
is plotted between oC and oF is
a.
5
9
b.
9
√106
c.
5
√106
d.
14
√106

7. Q. A thermocouple produces an emf of 40 μV/0C in a linear
range of temperature. A galvanometer of resistance 10 Ω
capable of detecting a current of 1μA is employed. What
is the smallest temperature that can be detected by this
arrangement?
a. 0.15 0C
b. 0.20 0C
c. 0.25 0C
d. 0.40 0C

8. Thermal Expansion

9. Q. A brass rod and lead rod each 80 cm long at 0 0C both
clamped together about one end with their free ends
coinciding. If whole system is placed in a steam bath, then
difference in length of both rods is (α brass=2 × 10-5/0C
and α lead=1 × 10-5/0C)
a. 0.2 mm
b. 0.8 mm
c. 1.4 mm
d. 1.6 mm

10. Q. A steel tape measure is accurate at 20 0C. It is used at 10
0C to measure a distance of 1 km. The reading of the tape
will be (α steel=12 × 10-6/0C )
a. 0.99 km
b. 1 km
c. 1.00012 km
d. 1.00024 km

11. Q. A steel rod when measured with a zinc scale both being at 25
0C appear to be 1m long. If scale is correct at 0 0C, then length
of the rod at 0 0C will be (α steel=12 × 10-6/0C and of zinc= 26
× 10-6/0C)
a. 1m
b. 1.00065 m
c. 1.00035 m
d. 1.00025 m

12. Q. Aniline of density 1021 kg/m3 is placed in water of density
998 kg/m3 at 20 0C. If aniline does not mix in water, then
temperature at which aniline form a globule which just
floats on water is (γ of aniline and water are 8.5 × 10-4/0C
and 4.5 × 10-4/0C )
a. 29 0C
b. 59 0C
c. 79 0C
d. 89 0C

13. Q. A piece of glass weighs 25 g in air, 16.77 g in water at 4 0C
and 16.89 g at 60 0C. If the linear expansivity of glass is 8
× 10-6/0C, then cubical expansivity of water is
a. 1.8 × 10-4/0C
b. 2.2 × 10-4/0C
c. 2.9 × 10-4/0C
d. 3.6 × 10-4/0C

14. Q. A copper vessel of capacity 1.8 m3 at a temperature of 20
0C is filled by glycerin. If the temperature rise to 50 0C,
then the glycerin overflow is ( 𝛼 of copper=16.7×10-6/0C
and γ of glycerin=5.3×10-4/0C)
a. 8.6×10-3 m3
b. 2.6×10-2 m3
c. 1.3×10-2 m3
d. 4.5×10-2 m3

15. Q. When a liquid kept in a copper vessel has its apparent
expansion is 6 × 10−6
/∘
C when the same liquid is heated
in steel vessel its apparent expansion is 24 × 10−6
/∘
C.
The linear expansively of copper is 18 × 10− 6
/∘
C. Find
out the linear expansivity of steel.
a. 9 × 10−6/∘C
b. 12 × 10−6/ ∘C
c. 24 × 10−6
/∘
C
d. 36 × 10−6/ ∘C

16. Q. Two marks on the glass rod 10 cm apart are found to
increase their distance by 0.08 mm when the rod is
heated from 0 0C to 100 0C. A flask made of the same
glass measures volume 1000 cc at 0 0C. The volume it
measures at 100 0C will be
a. 1002.4 cc
b. 1004.2 cc
c. 1006.2 cc
d. 1008.2 cc

17. Q. A clock of pendulum beats correctly when temperature is
30 0C. The time lose or gain in a day at 10 0C if α of metal
= 1.9×10-5/0C
a. gain 16.43 sec
b. lose 16.43 sec
c. lose 4.2 sec
d. gain 4.2 sec

18. Calorimetry

19. Q. Heat required to convert 10 g of ice at -10 0C into steam at 100 0C is
a. 7250 cal
b. 5360 cal
c. 6160 cal
d. 7200 cal

20. Q. A liquid of mass m and specific heat capacity S is heated to a
temperature θ. Another liaquid of mass m/2 and specific heat capacity
2S is heated to a temperature 2θ. If these two liquids are mixed, then
the temperature of mixture will be
a. θ/3
b. 2θ/3
c. 3θ/2
d. 8θ/5

21. Q. Three liquids of equal mass are at 12 0C, 19 0C and 28 0C
respectively. On mixing 1st and 2nd, the temperature of the mixture
becomes 16 0C and on mixing 2nd and 3rd, the temperature of the
mixture becomes 23 0C. The temperature of mixture on mixing
1st and 3rd is
a. 15.2 0C
b. 20.3 0C
c. 22.5 0C
d. 25 0C

22. Q. A man can melt 60 g of ice by chewing in one minute. The power
of man is
a. 80 W
b. 4800 W
c. 336 W
d. 19 W

23. Q. A block of metal of sp. Heat capacity 0.1 Cal/g0C fall from a height of
100 m. If 60% of energy of energy is converted in to heat, then rise
in temperature is
a. 1.43 0C
b. 1.53 0C
c. 1.62 0C
d. 0.95 0C

24. Q. The height from which a block of ice must drop so that it completely
melt if 75% of energy of fall is converted into heat is
a. 23.0 km
b. 45 km
c. 65.0 km
d. 75.0 km

25. Q. A body initially at 100 0C cools to 60 0C in 5 minutes and to 40 0C
in 10 minutes. The temperature of body at the end of 15 minutes
will be
a. 35 0C
b. 30 0C
c. 25 0C
d. 20 0C

26. Q. Steam at 100 0C is passed into 2 kg of water contained in a
calorimeter of water equivalent 0.02 kg at 15 0C till the temperature
of the calorimeter and its content rises to 95 0C. The mass of steam
condensed in kg is
a. 0.301 kg
b. 0.298 kg
c. 0.6 kg
d. 2.02 kg

27. Q. Three liquids of equal volume sp heat capacities s1, s2 and s3 at temperature
θ1, θ2 𝑎𝑛𝑑 θ3 and densities d1, d2 and d3 are mixed, then the final temperature
of mixture will be
a.
𝑠1
𝜃1
+𝑠2
𝜃2
+𝑠3
𝜃3
𝑑1
𝑠1
+𝑑2
𝑠2
+𝑑3
𝑠3
b.
𝑑1
𝑠1
𝜃1
+𝑑2
𝑠2
𝜃2
+𝑑3
𝑠3
𝜃3
𝑑1
𝑠1
+𝑑2
𝑠2
+𝑑3
𝑠3
c.
𝑑1
𝑠1
𝜃1
+𝑑2
𝑠2
𝜃2
+𝑑3
𝑠3
𝜃3
𝑑1
𝜃1
+𝑑2
𝜃2
+𝑑3
𝜃3
d.
𝑑1
𝜃1
+𝑑2
𝜃2
+𝑑3
𝜃3
𝑠1
𝜃1
+𝑠2
𝜃2
+𝑠3
𝜃3

28. Q. 50 g of water and equal volume of kerosene of density 0.8 g/cc are
placed are after another in same calorimeter of water equivalent 10
g. If the temperature falls from 55 0C to 50 0C in 8 min and 4.5 min
for water and liquid, then specific heat capacity of liquid is
a. 0.2 cal/g0C
b. 0.6 cal/g0C
c. 0.8 cal/g 0C
d. 1 cal/g0C

29. Q. A substance takes 3 min in cooling from 50 0C to 45 0C and 5 min
in cooling from 45 0C to 40 0C. The time in which it cools from
40 0C to 35 0C is 0
a. 7 min
b. 12 min
c. 15 min
d. 18 min

30. Q. The difference in temperature between bottom and top of waterfall
of 80 m is
a. 0.12 0C
b. 0.19 0C
c. 0.32 0C
d. 0.45 0C

31. Q. A 0.1 kg steel ball from a height of 10 m and bounces to a height
of 7 m. The rise in temperature of ball is (specific heat capacity
= 0.11 cal/g0C)
a. 0.032 0C
b. 0.064 0C
c. 0.12 0C
d. 0.24 0C