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Physics Past Questions
Which of the following instruments has a pure tone?
- A. guitar
- B. Vibrating String
- C. Turning forks
- D. Screen
A coin is at the bottom of a bucket filled with a liquid whose refractive index is 1.35. The coin appears to be 12.0cm below the surface of the liquid. Calculate the depth of the liquid.
- A. 16.2cm
- B. 13.4cm
- C. 8.9cm
- D. 5.4cm
Which of the following is not true about an object that is projected upwards at angle θ?
- A. the velocity is maximum at the maximum height
- B. the acceleration along the horizontal direction is zero
- C. the maximum range (Rmax) for an object moving with speed u is given by u2/g
- D. the time it takes to get the maximum height is equal to the time it takes to come back to the point of projection
Which of the following about electrolysis is false?
- A. liquid that conduct electricity and are split up chemically by the current are electrolyzed
- B. the current into the electrolyte by the anode
- C. the current is taken away from the electrolyte by the cathode
- D. the container which holds the electrolyte and the electrode is the voltmeter
Calculate the length of a displaced pendulum bob that passes its lowest point twice every second. [g=10ms-1]
- A. .100m
- B. 0.253m
- C. 0.450m
- D. 0.58m
The scent from a jar of perfume open move through the air molecules by
- A. evaporation
- B. osmosis
- C. diffusion
- D. Convection
If 21g of alcohol of density 0.7gcm-3 is mixed with 10g of water, what would be the density of the resulting mixture?
- A. 780gcm-3
- B. 0.78gcm-3
- C. 30gcm-3
- D. 10gcm-3
Dry air of column length 10 cm is trapped by a pellet of mercury of length 15 cm, with the open end uppermost. When the capillary is inverted the length of the air column increased to 25 cm while that of mercury remained constant. Calculate the atmospheric pressure (in cm of Hg.)
- A. 35 cm Hg
- B. 15 cm Hg
- C. 20 cm Hg
- D. 35 cm Hg
A simple pendulum 0.6 long has a period of 1.55, what is the period of a similar pendulum 0.4 long in the same direction
- A. 1.4 √1/3s
- B. 1.5 √1/3s
- C. 2.25s
- D. None of the above
A 70kg man ascends a flight of stairs of height 4m in 7s. The power expended by the man is;
- A. 40W
- B. 100W
- C. 280W
- D. 400W