Physics Past Questions And Answers
An electric device is rated 2000 W, 250 v. The correct fuse rating of the device is?
- A. 9 A
- B. 8 A
- C. 6 A
- D. 7 A
Which of the following conditions will make water boil at a temperature of 100oC when the atmospheric pressure is 750mmHg?
- A. increase the external pressure
- B. reduce the external pressure
- C. heat more rapidly at the same pressure
- D. reduce the external pressure by a quarter
If the force of attraction between the sun and the 1 planets is removed; the planets will
- A. fall towards the sun
- B. scatter and stop moving
- C. continue to move at tangent to their original orbits
- D. continue to move perpendicular to their original orbits.
A near sighted student has a near point of 0.1m and a focal length of 5.0cm. What is the student's far point?
- A) 0.200m
- B) 8.000m
- C) 0.125m
- D) 2.100m
An object of mass 5.0 kg moves with a velocity of 10ms-1. Calculate its momentum.
- A. 50.0 kgms-1
- B. 15.0 kgms-1 0.5 kgms-1
- C. 2.0 kgms-1
- D. 0.5 kgms-1
A sonometer wire of length 100cm under a tension of 10N, has a frequency of 250Hz. Keeping the length of the wire constant, the tension is adjusted to produce a new frequency of 350Hz. The new tension is
- A. 5.1N
- B. 7.1N
- C. 14.0N
- D. 19.6N
A ray of light is incident on a body x as shown in the diagram below. What is the refractive index of the body?
- A. 1.63
- B. 1.50
- C. 1.49
- D. 1.33
Which of the following physical quantities is correctly paired with it's corresponding S.I unit?
- A. density[kg m3]
- B. power[Js-1]
- C. specific latent heat [J kg-1K-1
- D. Pressure [Nm-1]
A gas at a volume of Vo in a container at pressure po is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?
- A. \(\frac{p_{0}} {5}\)
- B. \(\frac{4p_{0}}{5}\)
- C. p\(_{0}\)
- D. 5P\(_{0}\)
The sensitivity of a thermometer is
- A. All of the above
- B. how quickly a temperature change can be detected
- C. the difference between the maximum and the minimum temperature
- D. the smallest temperature change that can be detected or measured