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.
Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm
230π
23π
70π
140π
Correct answer is A
P = 0.2cm, L = r = 23cm
| VR | = | 2πr
P |
= | 2πL
P |
= | 2π×23
0.2 |
= | 230π |
Which of the following statement about the electromagnet shown above is correct?
when the current flows from A to B, the end A will be in north pole
when the current flows from A to B, the end A will be south pole
when the current flows from A to B, the end B will be south pole
none of the above
Correct answer is B
A - B = S - N.
Also, starting end of the current is south while terminating end is North.
Radio waves belongs to the class of waves whose velocity is about
340m/s
3 × 106 m/s
3 × 108 m/s
3 × 10−8 m/s
Correct answer is C
3 × 108 m/s