# Physics 2009 | Study Mode

Question 11
A
bi-metalic strip thermometer
B
thermocouple
C
platinium resistance thermometer
D
optical pyrometer
##### Explanation
A pyrometer is instrument for measuring high temperature.
The optical pyrometer is one in which the luminous radiation from the hot body is compared with that from a known source.

Question 12
A
constant
B
minimum
C
maximum
D
zero
##### Explanation
Anomalous expansion of water is at temperature ranges 0c to 4c u. water contract when heated from 0c to 4c. thus the volume of water is least at 4c

Question 13
A
4.28 kg
B
42.86 kg
C
1.02 kg
D
7.14 kg
##### Explanation
Energy supplied bythe heater = heater gained by water
pt = MCA
1000 x 300 = m x 4200(100 - 30)
m = (1000 x 300)/4200 x 70 = 1.02 kg

Question 14
A
room temperature
B
boiling point
C
freezing point
D
standard temperature
##### Explanation
Liquid boils when its sup. is equal to the atmospheric pressure.

Question 15
A
1.15 x 104s
B
1.15 x 103s
C
4.6 x 104s
D
4.6 x 103s
##### Explanation
Heat supplied = Heat gained
pt = ml
T = (ml)/p = (2 x 2.3 x 106)/1000 = 4.6 x 103 sec

Question 16
A
cohesion of water to glass is stronger than the cohesion of water molecules
B
adhesion of water molecules is weaker than the cohesion of water to glass
C
cohesion of water to glass is weaker than the cohesion of water molecules
D
adhesion of water molecules is stronger than the cohesion of water molecules
##### Explanation
When the adhesion of liquid molecules to the glass is more than the cohesion of the liquid, the liquid will wet glass.

Question 17
A
convection
B
C
refraction
D
conduction
##### Explanation
Radiation is the method of heat transfer without any unit ervening venue

Question 18
A
they are cheap
B
they are sourced locally
C
the speed of sound in them is very low
D
the speed of sound in them is very high
##### Explanation
The speed of sound is highest in solid, being about 500, units in steel rod

Question 19
A
quality
B
pitch
C
intensity
D
loudness
##### Explanation
The quality of a note is a characteristic that distinguishes it from note of the same frequency played by another musical instrument.

Question 20
A
II, III, and IV only
B
I, II and III only
C
III and IV only
D
II and IV only
##### Explanation
The sun and stars are self luminous object.

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