Physics Past Questions and Answers

Which of the following properties of matter CANNOT be utilized for temperature measurement? The

A Length of a liquid column
B Volume of a gas at constant pressure
C Pressure of a gas at constant volume
D Resistance of a metallic wire
E Current produced in a photoelectric effect

Question 27:

Which of the following statements about the compound microscope and astronomical telescope is (are) correct? i. the final image of a compound microscope is located at infinity ii. the final image of the astronomical telescope is always erect iii. the objective lens of a compound microscope has a very short focal length

A I only
B Ii only
C Iii only
D I and iii
E Ii and iii

Question 28:

A coin is placed at the bottom of a cube of glass tern thick. If the refractive index of the glass is \(\mu\), how high does the coin appear to be raised to an observer looking perpendicularly into the glass?

A \(\frac{1}{t - \mu}\)
B \(\frac{t(\mu - I)}{\mu}\)
C T (1 + \(\frac{1}{\mu}\))
D -\(\mu\)
E \(\mu\)t

Question 29:

The electromotive force obtained from a simple dynamo may be increased by

A Increasing the cross-sectional area of the coil
B Winding the coil on a soft-iron armature so as to decrease the magnetic flux through the coil
C Increasing the speed of rotation
D Making the field magnet longer
E Using low-resistance copper coils

Question 30:

A gun of mass 2.0kg fires a bullet of mass 16 x 10 ^-2kg due East. If the bullet leaves the nozzle of the gun with a velocity of 150ms^-1, what is the recoil velocity of the gun?

A 150ms^-1 due West
B 1.2 x 10^-4ms^-1 due West
C 1.2ms^-1 due West
D 1.2ms^-1 due East
E 150ms^-1 due East