Physics Past Questions And Answers
Water does not drip through an open umbrella of silk material unless the inside of the umbrella is touched. Which of the following phenomena is responsible for this?
- A. Surface tension
- B. Hydrostatic upthrust
- C. Viscosity
- D. Diffusion
A charge of \(4.6 × 10^-5\)C is placed in an electric field of intensity \(3.2 × 10^4\) \(Vm^-1\). What is the force acting on the electron?
- A. 1.5 N
- B. 3.7 N
- C. 4.2 N
- D. 2.5 N
A 40 kW electric cable is used to transmit electricity through a resistor of resistance 2.0Ω at 800 V. The power loss as internal energy is?
- A) 4.0 x 102W
- B) 5.0 x 102W
- C) 4.0 x 103W
- D) 5.0 x 103W
A wheel and axle of radii 800mm and 200mm respectively is used to raise a body of weight 800N by the application of 250N. Calculate the efficiency of the machine
- A. 85%
- B. 80%
- C. 60%
- D. 20%
The amount of heat given out or absorbed when a substance changes its state at a constant temperature is known as
- A. latent heat
- B. heat capacity
- C. specific latent heat
- D. specific heat capacity
A loaded test-tube which floats upright in water is carefully and slightly depressed and then released. Which of the following best describes the sub-sequent motion of the test-tube?
- A. Circular
- B. Rotational
- C. Random
- D. Oscillatory
The distance between two successive trough of a wave is 0.4m. If the frequency of the source is 825Hz, Calculate the speed of the wave
- A. 165.0 ms-1
- B. 330.0ms-1
- C. 41.5ms-1
- D. 85.0ms-1
An eclipse of the sun by the moon occurs when the sun, the moon and the earth are in a straight line and the
- A. earth casts a shadow on the moon
- B. moon casts a shadow on the sun
- C. moon is between the sun and the earth
- D. earth is between the sun and the moon
The instrument to measure the relative density of liquid is
- A. thermometer
- B. hydrometer
- C. spring balance
- D. beaker