Physics Past Questions And Answers
Which of the following quantities is a vector?
- A. speed
- B. distance
- C. energy
- D. momentum
A test tube of radius 1.0cm is loaded to 8.8g. If is placed upright in water, find the depth to which it would sink
- A. 2.8cm
- B. 5.2cm
- C. 25.5cm
- D. 28.0cm
The core of an efficient transformer should consist of laminated pieces of metal in order to
- A. increase the heat produced by increasing the eddy current
- B. increase the heat produced by reducing the eddy current
- C. reduce the heat produced by increasing the eddy current
- D. reduce the heat produced by reducing the eddy current
An object of mass 0.25kg moves at a height h above the ground with a speed of 4ms-1, if its mechanical energy at this height is 12 J, determine the value of h. [g = 10ms-1]
- A. 0.8m
- B. 4.0m
- C. 4.8m
- D. 5.6m
In the absence of gravitational force, the weight of the body is
- A. its mass
- B. zero
- C. its density
- D. its volume
The value of F in the figure below when in equilibrium is
- A. 10N
- B. 12N
- C. 20N
- D. 27N
A mirror of weight 75N is hung by a cord from a hook on the wall. If the cord makes an angle of 30o with horizontal, the tension in the cord is
- A) 100N
- B) 1500N
- C) 250N
- D) 150N
The half-life of a radio-active element is 9 days, what fraction of atoms has decayed in 36 days?
- A. \( \frac{1}{16} \)
- B. \( \frac{1}{4} \)
- C. \( \frac{1}{2} \)
- D. \( \frac{15}{16} \)
A student found out from a simple pendulum experiment that 20 oscillations were completed in 38 seconds. What is the period of oscillation of the pendulum?
- A. 8.0s
- B. 3.8 s
- C. 2.0 s
- D. 1.9 s
In photoelectric effect, electrons will leave the metal surface when illuminated by light of appropriate frequency if the photon energy is
- A. greater than the work function
- B. less than the work function
- C. equal to the work function
- D. equal to the maximium kinetic energy of the electron