Physics Past Questions and Answers

In a resonance tube experiment, which is illustrated above, the velocity of sound in air is 327.68m/s, the frequency of the turning fork used is therefore

A 128HZ
B 256HZ
C 512HZ
D 768HZ
E 1024HZ

Question 97:

A uniform bean HK of length 10m and weighing 200N is supported at both ends as shown above. A man weighing 1000N stands at a point P on the beam. If the reactions at point H an K respectively are 800N and 400N, Then the distance HP is

A 4m
B 3.5m
C 3m
D \( 6 \frac{2}{3} \)m
E 7m

Question 98:

Fig 8 shows a current I flowing in a copper wire situated in a magnetic field existing between the pole-pieces of a horse-shoe magnet.<br/>Which of the following statements is correct?

A The wire will experience a force in the direction into the paper
B The wire will experience a force in the direction out of the paper
C The wire will vibrate in a direction into and out of the paper
D The wire will move in the direction of the field i.e toward the s-pole
E The wire will not move because it is made of copper which is non magnetic

Question 99:

For the wave motion represented above <br/>The wavelength is given by

Question 100:

fig 10 shows a see-saw which is perfectly in balance, the weighs of the people sitting on it are 50kg, xkg and 15kg as shown, the sit at distances of 1.5, 1.5 and 2m from the pivot respectively. The vale of X is

A 30
B 35
C 70
D 24.25
E Impossible to find