Physics Past Questions And Answers
Which of the following units is derived?
- A. kg
- B. m
- C. K
- D. N
The phenomenon where by the water droplets in the atmosphere combines with dust particles in the air to reduce visibility is
- A. cloud
- B. mist
- C. hail
- D. fog
The inner diameter of a test tube can be measured accurately using a?
- A. micrometer screw gauge
- B. pair of dividers
- C. meter rule
- D. pair of vernier calipers
Dew point is not affected by
- A. temperature
- B. wind
- C. the amount of water vapour in the atmosphere
- D. atmospheric pressure
The current in a series R-L-C circuit attains its maximum value when the
- A. Impedance is greater than the capacitive reactance
- B. Inductive reactance is equal to the capacitive reactance
- C. Inductive reactance is greater than the capacitive reactance
- D. capacitive reactance is less than resistance
Which of the following statements about the human eye and the camera is correct?
- A. both form virtual image of objects
- B. the image formed by the eye is upright in the retina while that formed by the camera is inverted on the film
- C. the inside of both of them is blackened to absorb unwanted light
- D. the focal length of both eye lens and the camera lens can be varied
The ability of the human eye to focus object on the retina is referred to as the power of
- A) interference
- B) diffraction
- C) accommodation
- D) superposition
When an object is placed at the principal focus of a concave mirror, the location of the image formed is
- A. between principal focus and pole
- B. between principal focus and centre of curvature
- C. at infinity
- D. at centre of curvature
(a) What is surface tension? Explain the phenomenon in terms of intermolecular forces
(b) Describe a simple experiment to demonstrate the surface tension of a liquid
(c) State three examples to illustrate the effects of surface tension
(d) Why does water wet a clean glass surface whereas mercury does not?
(e) State two methods by which the surface tension of a liquid may reduced.
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Which of the following statements is not correct?
- A. A magnetic Held is a region where a magnetic force can be detected.
- B. Magnetic fields are scalar quantities.
- C. The magnitude of the magnetic force experienced by a moving charge depends on the speed on the charge.
- D. the angle between the direction of the earth