- An observer heard the sound of thunder 5.8s after the lightning flash was seen. How far was he from the source? [Speed of sound in air = 330ms-1]
- A. 957m
- B. 1914m
- C. 3828m
- D. 8700m
- E. 17400m
Reveal Answer
2.Â
The space between the two walls of a vacuum flask is completely evacuated to reduce heat loss by
- A. condensation
- B. conduction
- C. convection
- D. evaporation
- E. radiation
Â
Reveal Answer
3. Which of the following substances undergoes sublimation?
- A. Ether
- B. Ice
- C. Iodine
- D. Naphthalene
- E. Turpentine
Reveal Answer
4. Determine the value of x from the nuclear reaction below,
- A. 220
- B. 222
- C. 224
- D. 226
- E. 228
Reveal Answer
5. Which of the following statements about the pressure in a liquid is NOT correct? It
- A. acts in all direction
- B. changes with the material of the container
- C. is the same at all points in the same horizontal plane
- D. varies with the density of the liquid
- E. varies with the depth of the liquid
Reveal Answer
6. In which of the following fields is repulsion NOT experienced?
- A. Electrical only
- B. Gravitational only
- C. Magnetic only
- D. Magnetic and electrical
- E. Magnetic and gravitational
Reveal Answer
7. A ball of mass 100g falls from a height of 5m onto a concrete floor and rebounds to a height of 3m. Calculate the energy lost. (g = 10ms-2)
- A. 2J
- B. 20J
- C. 100J
- D. 1000J
- E. 2000J
Reveal Answer
8. Two forces of magnitude 8N and 4N act at right angle to each other. The angle between the resultant and the 8N force is
- A. 23.9°
- B. 26.6°
- C. 29.5°
- D. 60.0°
- E. 63.4°
Reveal Answer
9. The defect of the eye lens which occurs as a result of weak ciliary muscles is called
- A. astigmatism
- B. hypermetropia
- C. myopia
- D. presbyopia
- E. spherical aberration
Reveal Answer
10. Which of the following pairs of phenomena helps in the resolution of the wave-particle paradox of matter?
- A. Compton effect and thermionic emission
- B. Electron diffraction and refraction
- C. emission and absorption of light
- D. Interference and polarization
- E. Reflection and photoelectric effect
Reveal Answer
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