Physics Past Questions and Answers

A metal sphere is placed on an insulating stand. A negatively charged rod is brought close to it. If the sphere is earthed and the rod is taken away, what will be the charge on the sphere?

A The sphere will remain neutral.
B The sphere will have a net negative charge.
C The sphere will have a net positive charge.
D The sphere will become polarized

Question 32:

The property of wave shown in the diagram above is?

A Diffraction
B Refraction
C Polarisation
D Interference

Question 33:

Which of the following statements regarding the application of electrical conduction via gases is/are correct?
Electrical conduction in gas is applied in:
(i) The identification of gases
(ii) Lighting/fluorescent tubes
(iii) Photocells
(iv) Cathode ray oscilloscope/T.V. tubes

A (i), (iii) and (iv) only
B (i), (ii) and (iv) only
C (ii), (iii) and (iv) only
D (i), (ii) and (iii) only

Question 34:

Find the tension in the two cords shown in the figure above. Neglect the mass of the cords, and assume that the angle is 38° and the mass m is 220 kg

[Take g = 9.8 ms-2]

A \(T_1\) = 2864 N, \(T_2\)= 3612 N
B \(T_1\)= 3612 N, \(T_2\) = 2864 N
C \(T_1\)= 3502 N, \(T_2\)= 2760 N
D \(T_1\) = 2760 N, \(T_2\) = 3502 N

Question 35:

A missile is launched with a speed of 75 ms-1 at an angle of 22° above the surface of a warship. Find the horizontal range achieved by the missile. Ignore the effects of air resistance.

[Take g = 10 ms-2]

A 195
B 271 m
C 391 m
D 136 m