Physics Questions and Answers
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.
The vacuum in a thermos flask helps to reduce heat transfer by?
convection and radiation
convection and conduction
conduction and radiation
radiation only
Correct answer is B
No explanation has been provided for this answer.
copper, steel, glass
steel, copper, glass
steel, glass, copper
copper, glass, steel
Correct answer is A
No explanation has been provided for this answer.
1466Jkg-1 oC-1
2933Jkg-1 oC-1
4400Jkg-1 oC-1
5866Jkg-1 oC-1
Correct answer is A
22,000 = 1.5 x c x (30 - 20)
c = 1466Jkg-1 oC-1
100oC
80oC
50oC
40oC
Correct answer is C
Heat loss = heat gained
mh x ch x \(\theta\)h = mc x cc x \(\theta\)c
mh x ch x (\(\theta\) - 20) = mc x cc x (20 - 10)
ch = cc ; mc = 3mh
therefore, \(\theta\) = 50oC
72.0cm
74.5cm
75.1cm
76.0cm
Correct answer is D
Using, P1V1 = P2V2
(75 - 73.5) x 8 = (X - 74) x 6
X = 76cm