Physics Past Questions and Answers

the image above shows an inverted U-tube with the open end, O of one limb below the level, W of water in the tank, in order that water should begin to flow from the tank it is is necessary that

A The U-tube is completely filled with water and that P should be higher that W
B P should be lower than O and W
C P should be lower than W and O should reach the botton of the table
D The U-tube is completely filled with water and that P should be lower that W

Question 42:

Four resistors R1,R2,R3 and R4 are connected in series as shown above, V1,V2,V3 are voltmeters connected as indicated above. Which of the following relations is correct??

A V1 = V3 =V2/2
B V1 = 2V2 = V3
C V1=1/2V3 =V3
D V2 - V1 = V3

Question 43:

In the Figure above, QR is a vertical conductor and the current I flows from R to Q, P is a point on the horizontal plane and is to the south of the wire. The direction of the magnetic field at P due to the current is

A Upward
B North
C South
D West
E East

Question 44:

Each of the figures in the diagram above represent two current carrying conductors situated close to each other. In which two diagrams, are the forces between the two wires attractive

A I and V
B I and II
C II and IV
D II and V
E III and IV

Question 45:

Which of the following figures gives the correct resultant R of two vectors P and Q?

A I
B II
C III
D IV
E V