Physics Past Questions and Answers

In a radioactive series
\( ^{235} _{92}L \to ^{235} _{92}M \to ^{231} _{90}N \to ^{231} _{91}\phi \)
The particles emitted are respectively

A \( \beta , \beta , \alpha \)
B \( \alpha , \gamma , \beta \)
C \( \gamma , \alpha , \beta \)
D \( \alpha , \alpha , \beta \)
E \( \beta , \alpha , \beta \)

Question 37:

Two taxis leave benin and agbor some 80km apart at 1200hr as shown above. from the distance time graph shown the distance of their meeting point P, from Benin and the time of their meeting are

A 27km, 1218hr
B 29km, 1315hr
C 40km, 1418hr
D 53km, 1436hr
E 60km, 1500hr

Question 38:

The water manometer above is measuring the pressure of gas supply. if the specific gravity of mercury is 13.6 and the atmospheric pressure is 70cm of mercury what is the total pressure of the gas supply in cm of water

A 67cm
B 73cm
C 949cm
D 952cm
E 955cm

Question 39:

in the image above, an incident ray XY makes an angle of 15\( ^{\circ} \) with a fixed line AY which is normal to surface of a plane mirror if the mirroe is turned as indicated by the arrow through \( 40^{\circ} \) what angle will the reflected ray make with AY

A \( 25^{\circ} \)
B \( 40^{\circ} \)
C \( 15^{\circ} \)
D \( 55^{\circ} \)
E \( 95^{\circ} \)

Question 40:

the arrow represents an object in front of a convex mirror whose focal points are X and Y. The image formed is

A Between X and P
B Between P and Y
C Between Y and Z
D Outside W
E Outside Z