Physics Past Questions and Answers

Three forces with magnitudes 16 N, 12 N and 21 N are shown in the diagram below. Determine the magnitude of their resultant force and angle with the x-axis

A 7.63N,61°
B 8.71N,61°
C 7.63N,29°
D 8.71N,29°

Question 2372:

A travelling wave of amplitude 0.80 m has a frequency of 16 Hz and a wave speed of 20 \(ms-1\)

Calculate the wave number of the wave.

Question 2373:

The near point of a patient's eye is 50.0 cm. What power (in diopters) must a corrective lens have to enable the eye to see clearly an object 25.0 cm away?

A 2 diopters
B 2.5 diopters
C 0.5 diopters
D 3 diopters

Question 2374:

Which of the following is/are not true about the heat capacity of a substance?
(i) It is an intensive property
(ii) Its S.I unit is \(jK-1\)
(iii) It is an extensive property
(iv) Its S.I unit is \(jkg-1\)

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

Question 2375:

The pinhole camera works on

A The principle of the reversibility of light
B The principle of the rectilinear propagation of light
C Huygen’s principle
D The principle of total internal reflection of light