Physics Past Questions And Answers
A body of mass 4kg is acted on by a constant force of 12N for 3 seconds. The kinetic energy gained by the body at the end of the time is
- A. 144J
- B. 162J
- C. 81J
- D. 72J
A body is said to be moving with uniform acceleration if it experiences equal
- A. increase in velocity at equal time intervals
- B. decreases in velocity at equal time intervals
- C. increases in speed at equal time intervals
- D. decreases in speed at equal time intervals
The particle that is responsible for the nuclear fission in a nuclear reactor is
- A. neutron
- B. prton
- C. electron
- D. photon
Which of the following properties of a steel bar can be measured in terms of the dimension of length only?
- A. weight
- B. density
- C. pressure
- D. volume
The surface temperature of a swimming pool on a warm day is 25°C and the temperature at the bottom is 15°C. If the swimming pool has a surface area of 620 m2 and a depth of 1.5m. Find the rate at which energy is transferred by conduction from the surface to the bottom of the swimming pool. [Thermal conductivity of water (k) = 0.6071 Wm-1K-1]
- A. 2.5kw
- B. 250kw
- C. 300kw
- D. 3.0kw
The length of a displaced pendulum ball which passes its lowest point twice every seconds is [g = 10ms-2]
- A. 0.25 m
- B. 0.45 m
- C. 0.58m
- D. 1.00m
When a nucleus is formed by bringing protons and neutrons together, the actual mass of the formed nucleus is less than the sum of the masses of the energy equivalent of this mass difference is the
- A. lost energy
- B. work function
- C. binding energy
- D. stability energy
The ability of a wave to spread around corners is called
- A. polarisation
- B. dispersion
- C. diffraction
- D. reflection
A 120V, 60W lamp is to be operated on 220V ac supply mains. calculate the value of non inductive resistance that would be required to ensure that the lamp is run on correct value
- A) 100Ω
- B) 200Ω
- C) 300Ω
- D) 500Ω
The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is
- A. 380mmHg
- B. 570mmHg
- C. 190mmHg
- D. 480mmHg