Calculate the velocity ratio of a screw jack of pitch 0.2cm if the length of the tommy bar is 23cm
230\(\pi\)
23\(\pi\)
70\(\pi\)
140\(\pi\)
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.
component
equilibrant
resultant
resistant
Correct answer is C
Resultant is the representing vector for multiple forces.
Radio waves belongs to the class of waves whose velocity is about
340m/s
3 × 10\(^{6}\) m/s
3 × 10\(^{8}\) m/s
3 × 10\(^{-8}\) m/s
Correct answer is C
3 × 10\(^{8}\) m/s
1.50
1.68
2.58
1.82
Correct answer is A
R = th = 2cm, d = 0.67cm
| n | = | R
A |
= | R
R.d |
= | 2
2-0.67 |
= | 1.52 |
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