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.
4.80 kJ
20.16 kJ
40.32 kJ
22.17 kJ
Correct answer is C
Heat needed to change 60g (0.06kg) of ice at 0\(^o\)C to water at 0\(^o\)
= 0.06 x 3.36 x 10\(^5\)J
= 0.2016 x 10\(^5\) J
Heat required to raise the temp. of 60g (0.06kg) of water from 0\(^o\)C to 80\(^o\)C
= 0.06 x 4.2 x 10\(^3\) x (80.0)J
= 0.06 x 4.2 x 10\(^3\) x 80
= 20.16 x 10\(^3\)
= 0.2016 x 10\(^5\)
Total heat needed = (0.2016 + 0.2016) 10\(^5\)J
= 0.4032 x 10\(^5\) J
= 40.32KJ
heat the mercury and make it expand
increase the pressure above the mercury.
cool the mercury and make it contract.
decrease the pressure above the mercury
Correct answer is B
No explanation has been provided for this answer.
A
B
C
D
Correct answer is D
No explanation has been provided for this answer.
A freshly demagnetized bar magnet is placed in the East-West direction to ensure that
the molecular magnets remain randomly arranged.
the molecular magnets are properly aligned
it is affected by the earth's magnetic field
the magnetic domains are within the earth's field
Correct answer is A
No explanation has been provided for this answer.
If the efficiency of a transformer is 100%, which of the following equations would be correct?
N\(_p\)E\(_p\) = N\(_s\)E\(_s\)
N\(_s\)I\(_p\)= N\(_p\)I\(_s\)
N\(_s\)I\(_s\) = N\(_p\)I\(_p\)
I\(_p\)E\(_s\) = I\(_s\)E\(_p\)
Correct answer is D
No explanation has been provided for this answer.