Physics Past Questions and Answers

In a certain fusion reaction, a deuteron (\(^{2}_{1}H\)) interacts with a triton (\(^{3}_{1}He\)) and produces an a-particle (\(^{4}_{2}He\)) and a second product. The second product is

A A proton
B An electron
C A neutron
D A gamma ray

Question 37:

Which of the following symbolic representations is correct for an atom X with 22 electrons and 43 neutrons?

A \(^{43}_{22}X\)
B \(^{22}_{43}X\)
C \(^{65}_{43}X\)
D \(^{65}_{22}X\)

Question 38:

the fig above shows displacement-time graphs for three different motions. which of the following statements is correct

A Graph 2 corresponds to the highest velocity
B Graph 1 corresponds to zero gravity
C Graph 3 corresponds to a particle moving in the negative x direction
D Graph 2 corresponds to a particle moving in the positive x direction

Question 39:

the fig above shows three different ways of hanging a heavy picture from a hook. the tension in the string will be

A Greatest in X
B Greatest in Y
C Greatest in Z
D Same in each one

Question 40:

When one arm of a U-tube manometer is connected to a gas supply, the levels of mercury in the two arms of the U-tube is shown in the figure above, if the atmospheric pressure is 76.0cm hg, the gas pressure is

A 62.6cm hg
B 72.5cm hg
C 79.5cm hg
D 85.9cm hg