I, II and Ill
ll and ll only
l and lII only
I and II only
Correct answer is A
ripple tank experiment can be used to demonstrate the following properties of waves:
Reflection
Refraction
Diffraction
78 °C
25 \(^o\)C
30\(^o\)C
57 \(^o\)C
Correct answer is D
Using the formula
t = \(\frac{R - R_0}{R_{(100)} - R_0} \times 100^oC\)
t = \(\frac{7.5 - 3.5}{10.5 - 2..5} \times 100^oC\)
= \(\frac{4}{7} \times 100\)
= 57.14\(^o\)C
~ 57\(^o\)C
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.
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.